afl-fuzz.c completely splitted

8 files changed, 9728 insertions, 9653 deletions

diff --git a/src/afl-fuzz-bitmap.c b/src/afl-fuzz-bitmap.c
index 6cd9852f..1a77dc13 100644
--- a/src/afl-fuzz-bitmap.c
+++ b/src/afl-fuzz-bitmap.c
@@ -408,3 +408,296 @@ void minimize_bits(u8* dst, u8* src) {
 
 }
 
+
+#ifndef SIMPLE_FILES
+
+/* Construct a file name for a new test case, capturing the operation
+   that led to its discovery. Uses a static buffer. */
+
+u8* describe_op(u8 hnb) {
+
+  static u8 ret[256];
+
+  if (syncing_party) {
+
+    sprintf(ret, "sync:%s,src:%06u", syncing_party, syncing_case);
+
+  } else {
+
+    sprintf(ret, "src:%06u", current_entry);
+
+    sprintf(ret + strlen(ret), ",time:%llu", get_cur_time() - start_time);
+
+    if (splicing_with >= 0)
+      sprintf(ret + strlen(ret), "+%06d", splicing_with);
+
+    sprintf(ret + strlen(ret), ",op:%s", stage_short);
+
+    if (stage_cur_byte >= 0) {
+
+      sprintf(ret + strlen(ret), ",pos:%d", stage_cur_byte);
+
+      if (stage_val_type != STAGE_VAL_NONE)
+        sprintf(ret + strlen(ret), ",val:%s%+d", 
+                (stage_val_type == STAGE_VAL_BE) ? "be:" : "",
+                stage_cur_val);
+
+    } else sprintf(ret + strlen(ret), ",rep:%d", stage_cur_val);
+
+  }
+
+  if (hnb == 2) strcat(ret, ",+cov");
+
+  return ret;
+
+}
+
+#endif /* !SIMPLE_FILES */
+
+
+/* Write a message accompanying the crash directory :-) */
+
+static void write_crash_readme(void) {
+
+  u8* fn = alloc_printf("%s/crashes/README.txt", out_dir);
+  s32 fd;
+  FILE* f;
+
+  fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
+  ck_free(fn);
+
+  /* Do not die on errors here - that would be impolite. */
+
+  if (fd < 0) return;
+
+  f = fdopen(fd, "w");
+
+  if (!f) {
+    close(fd);
+    return;
+  }
+
+  fprintf(f, "Command line used to find this crash:\n\n"
+
+             "%s\n\n"
+
+             "If you can't reproduce a bug outside of afl-fuzz, be sure to set the same\n"
+             "memory limit. The limit used for this fuzzing session was %s.\n\n"
+
+             "Need a tool to minimize test cases before investigating the crashes or sending\n"
+             "them to a vendor? Check out the afl-tmin that comes with the fuzzer!\n\n"
+
+             "Found any cool bugs in open-source tools using afl-fuzz? If yes, please drop\n"
+             "an mail at <afl-users@googlegroups.com> once the issues are fixed\n\n"
+
+             "  https://github.com/vanhauser-thc/AFLplusplus\n\n",
+
+             orig_cmdline, DMS(mem_limit << 20)); /* ignore errors */
+
+  fclose(f);
+
+}
+
+
+/* Check if the result of an execve() during routine fuzzing is interesting,
+   save or queue the input test case for further analysis if so. Returns 1 if
+   entry is saved, 0 otherwise. */
+
+u8 save_if_interesting(char** argv, void* mem, u32 len, u8 fault) {
+
+  if (len == 0) return 0;
+
+  u8  *fn = "";
+  u8  hnb;
+  s32 fd;
+  u8  keeping = 0, res;
+
+  /* Update path frequency. */
+  u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+  struct queue_entry* q = queue;
+  while (q) {
+    if (q->exec_cksum == cksum)
+      q->n_fuzz = q->n_fuzz + 1;
+
+    q = q->next;
+
+  }
+
+  if (fault == crash_mode) {
+
+    /* Keep only if there are new bits in the map, add to queue for
+       future fuzzing, etc. */
+
+    if (!(hnb = has_new_bits(virgin_bits))) {
+      if (crash_mode) ++total_crashes;
+      return 0;
+    }    
+
+#ifndef SIMPLE_FILES
+
+    fn = alloc_printf("%s/queue/id:%06u,%s", out_dir, queued_paths,
+                      describe_op(hnb));
+
+#else
+
+    fn = alloc_printf("%s/queue/id_%06u", out_dir, queued_paths);
+
+#endif /* ^!SIMPLE_FILES */
+
+    add_to_queue(fn, len, 0);
+
+    if (hnb == 2) {
+      queue_top->has_new_cov = 1;
+      ++queued_with_cov;
+    }
+
+    queue_top->exec_cksum = cksum;
+
+    /* Try to calibrate inline; this also calls update_bitmap_score() when
+       successful. */
+
+    res = calibrate_case(argv, queue_top, mem, queue_cycle - 1, 0);
+
+    if (res == FAULT_ERROR)
+      FATAL("Unable to execute target application");
+
+    fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
+    if (fd < 0) PFATAL("Unable to create '%s'", fn);
+    ck_write(fd, mem, len, fn);
+    close(fd);
+
+    keeping = 1;
+
+  }
+
+  switch (fault) {
+
+    case FAULT_TMOUT:
+
+      /* Timeouts are not very interesting, but we're still obliged to keep
+         a handful of samples. We use the presence of new bits in the
+         hang-specific bitmap as a signal of uniqueness. In "dumb" mode, we
+         just keep everything. */
+
+      ++total_tmouts;
+
+      if (unique_hangs >= KEEP_UNIQUE_HANG) return keeping;
+
+      if (!dumb_mode) {
+
+#ifdef __x86_64__
+        simplify_trace((u64*)trace_bits);
+#else
+        simplify_trace((u32*)trace_bits);
+#endif /* ^__x86_64__ */
+
+        if (!has_new_bits(virgin_tmout)) return keeping;
+
+      }
+
+      ++unique_tmouts;
+
+      /* Before saving, we make sure that it's a genuine hang by re-running
+         the target with a more generous timeout (unless the default timeout
+         is already generous). */
+
+      if (exec_tmout < hang_tmout) {
+
+        u8 new_fault;
+        write_to_testcase(mem, len);
+        new_fault = run_target(argv, hang_tmout);
+
+        /* A corner case that one user reported bumping into: increasing the
+           timeout actually uncovers a crash. Make sure we don't discard it if
+           so. */
+
+        if (!stop_soon && new_fault == FAULT_CRASH) goto keep_as_crash;
+
+        if (stop_soon || new_fault != FAULT_TMOUT) return keeping;
+
+      }
+
+#ifndef SIMPLE_FILES
+
+      fn = alloc_printf("%s/hangs/id:%06llu,%s", out_dir,
+                        unique_hangs, describe_op(0));
+
+#else
+
+      fn = alloc_printf("%s/hangs/id_%06llu", out_dir,
+                        unique_hangs);
+
+#endif /* ^!SIMPLE_FILES */
+
+      ++unique_hangs;
+
+      last_hang_time = get_cur_time();
+
+      break;
+
+    case FAULT_CRASH:
+
+keep_as_crash:
+
+      /* This is handled in a manner roughly similar to timeouts,
+         except for slightly different limits and no need to re-run test
+         cases. */
+
+      ++total_crashes;
+
+      if (unique_crashes >= KEEP_UNIQUE_CRASH) return keeping;
+
+      if (!dumb_mode) {
+
+#ifdef __x86_64__
+        simplify_trace((u64*)trace_bits);
+#else
+        simplify_trace((u32*)trace_bits);
+#endif /* ^__x86_64__ */
+
+        if (!has_new_bits(virgin_crash)) return keeping;
+
+      }
+
+      if (!unique_crashes) write_crash_readme();
+
+#ifndef SIMPLE_FILES
+
+      fn = alloc_printf("%s/crashes/id:%06llu,sig:%02u,%s", out_dir,
+                        unique_crashes, kill_signal, describe_op(0));
+
+#else
+
+      fn = alloc_printf("%s/crashes/id_%06llu_%02u", out_dir, unique_crashes,
+                        kill_signal);
+
+#endif /* ^!SIMPLE_FILES */
+
+      ++unique_crashes;
+
+      last_crash_time = get_cur_time();
+      last_crash_execs = total_execs;
+
+      break;
+
+    case FAULT_ERROR: FATAL("Unable to execute target application");
+
+    default: return keeping;
+
+  }
+
+  /* If we're here, we apparently want to save the crash or hang
+     test case, too. */
+
+  fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
+  if (fd < 0) PFATAL("Unable to create '%s'", fn);
+  ck_write(fd, mem, len, fn);
+  close(fd);
+
+  ck_free(fn);
+
+  return keeping;
+
+}
+
diff --git a/src/afl-fuzz-init.c b/src/afl-fuzz-init.c
new file mode 100644
index 00000000..f66db74c
--- /dev/null
+++ b/src/afl-fuzz-init.c
@@ -0,0 +1,1943 @@
+/*
+   american fuzzy lop - fuzzer code
+   --------------------------------
+
+   Written and maintained by Michal Zalewski <lcamtuf@google.com>
+
+   Forkserver design by Jann Horn <jannhorn@googlemail.com>
+
+   Copyright 2013, 2014, 2015, 2016, 2017 Google Inc. All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   This is the real deal: the program takes an instrumented binary and
+   attempts a variety of basic fuzzing tricks, paying close attention to
+   how they affect the execution path.
+
+ */
+
+#include "afl-fuzz.h"
+
+
+#ifdef HAVE_AFFINITY
+
+/* Build a list of processes bound to specific cores. Returns -1 if nothing
+   can be found. Assumes an upper bound of 4k CPUs. */
+
+void bind_to_free_cpu(void) {
+
+  DIR* d;
+  struct dirent* de;
+  cpu_set_t c;
+
+  u8 cpu_used[4096] = { 0 };
+  u32 i;
+
+  if (cpu_core_count < 2) return;
+
+  if (getenv("AFL_NO_AFFINITY")) {
+
+    WARNF("Not binding to a CPU core (AFL_NO_AFFINITY set).");
+    return;
+
+  }
+
+  d = opendir("/proc");
+
+  if (!d) {
+
+    WARNF("Unable to access /proc - can't scan for free CPU cores.");
+    return;
+
+  }
+
+  ACTF("Checking CPU core loadout...");
+
+  /* Introduce some jitter, in case multiple AFL tasks are doing the same
+     thing at the same time... */
+
+  usleep(R(1000) * 250);
+
+  /* Scan all /proc/<pid>/status entries, checking for Cpus_allowed_list.
+     Flag all processes bound to a specific CPU using cpu_used[]. This will
+     fail for some exotic binding setups, but is likely good enough in almost
+     all real-world use cases. */
+
+  while ((de = readdir(d))) {
+
+    u8* fn;
+    FILE* f;
+    u8 tmp[MAX_LINE];
+    u8 has_vmsize = 0;
+
+    if (!isdigit(de->d_name[0])) continue;
+
+    fn = alloc_printf("/proc/%s/status", de->d_name);
+
+    if (!(f = fopen(fn, "r"))) {
+      ck_free(fn);
+      continue;
+    }
+
+    while (fgets(tmp, MAX_LINE, f)) {
+
+      u32 hval;
+
+      /* Processes without VmSize are probably kernel tasks. */
+
+      if (!strncmp(tmp, "VmSize:\t", 8)) has_vmsize = 1;
+
+      if (!strncmp(tmp, "Cpus_allowed_list:\t", 19) &&
+          !strchr(tmp, '-') && !strchr(tmp, ',') &&
+          sscanf(tmp + 19, "%u", &hval) == 1 && hval < sizeof(cpu_used) &&
+          has_vmsize) {
+
+        cpu_used[hval] = 1;
+        break;
+
+      }
+
+    }
+
+    ck_free(fn);
+    fclose(f);
+
+  }
+
+  closedir(d);
+
+  for (i = 0; i < cpu_core_count; ++i) if (!cpu_used[i]) break;
+
+  if (i == cpu_core_count) {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "Uh-oh, looks like all %d CPU cores on your system are allocated to\n"
+         "    other instances of afl-fuzz (or similar CPU-locked tasks). Starting\n"
+         "    another fuzzer on this machine is probably a bad plan, but if you are\n"
+         "    absolutely sure, you can set AFL_NO_AFFINITY and try again.\n",
+         cpu_core_count);
+
+    FATAL("No more free CPU cores");
+
+  }
+
+  OKF("Found a free CPU core, binding to #%u.", i);
+
+  cpu_aff = i;
+
+  CPU_ZERO(&c);
+  CPU_SET(i, &c);
+
+  if (sched_setaffinity(0, sizeof(c), &c))
+    PFATAL("sched_setaffinity failed");
+
+}
+
+#endif /* HAVE_AFFINITY */
+
+/* Load postprocessor, if available. */
+
+void setup_post(void) {
+
+  void* dh;
+  u8* fn = getenv("AFL_POST_LIBRARY");
+  u32 tlen = 6;
+
+  if (!fn) return;
+
+  ACTF("Loading postprocessor from '%s'...", fn);
+
+  dh = dlopen(fn, RTLD_NOW);
+  if (!dh) FATAL("%s", dlerror());
+
+  post_handler = dlsym(dh, "afl_postprocess");
+  if (!post_handler) FATAL("Symbol 'afl_postprocess' not found.");
+
+  /* Do a quick test. It's better to segfault now than later =) */
+
+  post_handler("hello", &tlen);
+
+  OKF("Postprocessor installed successfully.");
+
+}
+
+void setup_custom_mutator(void) {
+  void* dh;
+  u8* fn = getenv("AFL_CUSTOM_MUTATOR_LIBRARY");
+
+  if (!fn) return;
+
+  ACTF("Loading custom mutator library from '%s'...", fn);
+
+  dh = dlopen(fn, RTLD_NOW);
+  if (!dh) FATAL("%s", dlerror());
+
+  custom_mutator = dlsym(dh, "afl_custom_mutator");
+  if (!custom_mutator) FATAL("Symbol 'afl_custom_mutator' not found.");
+
+  pre_save_handler = dlsym(dh, "afl_pre_save_handler");
+//  if (!pre_save_handler) WARNF("Symbol 'afl_pre_save_handler' not found.");
+
+  OKF("Custom mutator installed successfully.");
+}
+
+
+/* Shuffle an array of pointers. Might be slightly biased. */
+
+static void shuffle_ptrs(void** ptrs, u32 cnt) {
+
+  u32 i;
+
+  for (i = 0; i < cnt - 2; ++i) {
+
+    u32 j = i + UR(cnt - i);
+    void *s = ptrs[i];
+    ptrs[i] = ptrs[j];
+    ptrs[j] = s;
+
+  }
+
+}
+
+/* Read all testcases from the input directory, then queue them for testing.
+   Called at startup. */
+
+void read_testcases(void) {
+
+  struct dirent **nl;
+  s32 nl_cnt;
+  u32 i;
+  u8* fn1;
+
+  /* Auto-detect non-in-place resumption attempts. */
+
+  fn1 = alloc_printf("%s/queue", in_dir);
+  if (!access(fn1, F_OK)) in_dir = fn1; else ck_free(fn1);
+
+  ACTF("Scanning '%s'...", in_dir);
+
+  /* We use scandir() + alphasort() rather than readdir() because otherwise,
+     the ordering  of test cases would vary somewhat randomly and would be
+     difficult to control. */
+
+  nl_cnt = scandir(in_dir, &nl, NULL, alphasort);
+
+  if (nl_cnt < 0) {
+
+    if (errno == ENOENT || errno == ENOTDIR)
+
+      SAYF("\n" cLRD "[-] " cRST
+           "The input directory does not seem to be valid - try again. The fuzzer needs\n"
+           "    one or more test case to start with - ideally, a small file under 1 kB\n"
+           "    or so. The cases must be stored as regular files directly in the input\n"
+           "    directory.\n");
+
+    PFATAL("Unable to open '%s'", in_dir);
+
+  }
+
+  if (shuffle_queue && nl_cnt > 1) {
+
+    ACTF("Shuffling queue...");
+    shuffle_ptrs((void**)nl, nl_cnt);
+
+  }
+
+  for (i = 0; i < nl_cnt; ++i) {
+
+    struct stat st;
+
+    u8* fn2 = alloc_printf("%s/%s", in_dir, nl[i]->d_name);
+    u8* dfn = alloc_printf("%s/.state/deterministic_done/%s", in_dir, nl[i]->d_name);
+
+    u8  passed_det = 0;
+
+    free(nl[i]); /* not tracked */
+ 
+    if (lstat(fn2, &st) || access(fn2, R_OK))
+      PFATAL("Unable to access '%s'", fn2);
+
+    /* This also takes care of . and .. */
+
+    if (!S_ISREG(st.st_mode) || !st.st_size || strstr(fn2, "/README.txt")) {
+
+      ck_free(fn2);
+      ck_free(dfn);
+      continue;
+
+    }
+
+    if (st.st_size > MAX_FILE) 
+      FATAL("Test case '%s' is too big (%s, limit is %s)", fn2,
+            DMS(st.st_size), DMS(MAX_FILE));
+
+    /* Check for metadata that indicates that deterministic fuzzing
+       is complete for this entry. We don't want to repeat deterministic
+       fuzzing when resuming aborted scans, because it would be pointless
+       and probably very time-consuming. */
+
+    if (!access(dfn, F_OK)) passed_det = 1;
+    ck_free(dfn);
+
+    add_to_queue(fn2, st.st_size, passed_det);
+
+  }
+
+  free(nl); /* not tracked */
+
+  if (!queued_paths) {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "Looks like there are no valid test cases in the input directory! The fuzzer\n"
+         "    needs one or more test case to start with - ideally, a small file under\n"
+         "    1 kB or so. The cases must be stored as regular files directly in the\n"
+         "    input directory.\n");
+
+    FATAL("No usable test cases in '%s'", in_dir);
+
+  }
+
+  last_path_time = 0;
+  queued_at_start = queued_paths;
+
+}
+
+
+/* Examine map coverage. Called once, for first test case. */
+
+static void check_map_coverage(void) {
+
+  u32 i;
+
+  if (count_bytes(trace_bits) < 100) return;
+
+  for (i = (1 << (MAP_SIZE_POW2 - 1)); i < MAP_SIZE; ++i)
+    if (trace_bits[i]) return;
+
+  WARNF("Recompile binary with newer version of afl to improve coverage!");
+
+}
+
+
+/* Perform dry run of all test cases to confirm that the app is working as
+   expected. This is done only for the initial inputs, and only once. */
+
+void perform_dry_run(char** argv) {
+
+  struct queue_entry* q = queue;
+  u32 cal_failures = 0;
+  u8* skip_crashes = getenv("AFL_SKIP_CRASHES");
+
+  while (q) {
+
+    u8* use_mem;
+    u8  res;
+    s32 fd;
+
+    u8* fn = strrchr(q->fname, '/') + 1;
+
+    ACTF("Attempting dry run with '%s'...", fn);
+
+    fd = open(q->fname, O_RDONLY);
+    if (fd < 0) PFATAL("Unable to open '%s'", q->fname);
+
+    use_mem = ck_alloc_nozero(q->len);
+
+    if (read(fd, use_mem, q->len) != q->len)
+      FATAL("Short read from '%s'", q->fname);
+
+    close(fd);
+
+    res = calibrate_case(argv, q, use_mem, 0, 1);
+    ck_free(use_mem);
+
+    if (stop_soon) return;
+
+    if (res == crash_mode || res == FAULT_NOBITS)
+      SAYF(cGRA "    len = %u, map size = %u, exec speed = %llu us\n" cRST, 
+           q->len, q->bitmap_size, q->exec_us);
+
+    switch (res) {
+
+      case FAULT_NONE:
+
+        if (q == queue) check_map_coverage();
+
+        if (crash_mode) FATAL("Test case '%s' does *NOT* crash", fn);
+
+        break;
+
+      case FAULT_TMOUT:
+
+        if (timeout_given) {
+
+          /* The -t nn+ syntax in the command line sets timeout_given to '2' and
+             instructs afl-fuzz to tolerate but skip queue entries that time
+             out. */
+
+          if (timeout_given > 1) {
+            WARNF("Test case results in a timeout (skipping)");
+            q->cal_failed = CAL_CHANCES;
+            ++cal_failures;
+            break;
+          }
+
+          SAYF("\n" cLRD "[-] " cRST
+               "The program took more than %u ms to process one of the initial test cases.\n"
+               "    Usually, the right thing to do is to relax the -t option - or to delete it\n"
+               "    altogether and allow the fuzzer to auto-calibrate. That said, if you know\n"
+               "    what you are doing and want to simply skip the unruly test cases, append\n"
+               "    '+' at the end of the value passed to -t ('-t %u+').\n", exec_tmout,
+               exec_tmout);
+
+          FATAL("Test case '%s' results in a timeout", fn);
+
+        } else {
+
+          SAYF("\n" cLRD "[-] " cRST
+               "The program took more than %u ms to process one of the initial test cases.\n"
+               "    This is bad news; raising the limit with the -t option is possible, but\n"
+               "    will probably make the fuzzing process extremely slow.\n\n"
+
+               "    If this test case is just a fluke, the other option is to just avoid it\n"
+               "    altogether, and find one that is less of a CPU hog.\n", exec_tmout);
+
+          FATAL("Test case '%s' results in a timeout", fn);
+
+        }
+
+      case FAULT_CRASH:  
+
+        if (crash_mode) break;
+
+        if (skip_crashes) {
+          WARNF("Test case results in a crash (skipping)");
+          q->cal_failed = CAL_CHANCES;
+          ++cal_failures;
+          break;
+        }
+
+        if (mem_limit) {
+
+          SAYF("\n" cLRD "[-] " cRST
+               "Oops, the program crashed with one of the test cases provided. There are\n"
+               "    several possible explanations:\n\n"
+
+               "    - The test case causes known crashes under normal working conditions. If\n"
+               "      so, please remove it. The fuzzer should be seeded with interesting\n"
+               "      inputs - but not ones that cause an outright crash.\n\n"
+
+               "    - The current memory limit (%s) is too low for this program, causing\n"
+               "      it to die due to OOM when parsing valid files. To fix this, try\n"
+               "      bumping it up with the -m setting in the command line. If in doubt,\n"
+               "      try something along the lines of:\n\n"
+
+               MSG_ULIMIT_USAGE " /path/to/binary [...] <testcase )\n\n"
+
+               "      Tip: you can use http://jwilk.net/software/recidivm to quickly\n"
+               "      estimate the required amount of virtual memory for the binary. Also,\n"
+               "      if you are using ASAN, see %s/notes_for_asan.txt.\n\n"
+
+               MSG_FORK_ON_APPLE
+
+               "    - Least likely, there is a horrible bug in the fuzzer. If other options\n"
+               "      fail, poke <afl-users@googlegroups.com> for troubleshooting tips.\n",
+               DMS(mem_limit << 20), mem_limit - 1, doc_path);
+
+        } else {
+
+          SAYF("\n" cLRD "[-] " cRST
+               "Oops, the program crashed with one of the test cases provided. There are\n"
+               "    several possible explanations:\n\n"
+
+               "    - The test case causes known crashes under normal working conditions. If\n"
+               "      so, please remove it. The fuzzer should be seeded with interesting\n"
+               "      inputs - but not ones that cause an outright crash.\n\n"
+
+               MSG_FORK_ON_APPLE
+
+               "    - Least likely, there is a horrible bug in the fuzzer. If other options\n"
+               "      fail, poke <afl-users@googlegroups.com> for troubleshooting tips.\n");
+
+        }
+#undef MSG_ULIMIT_USAGE
+#undef MSG_FORK_ON_APPLE
+
+        FATAL("Test case '%s' results in a crash", fn);
+
+      case FAULT_ERROR:
+
+        FATAL("Unable to execute target application ('%s')", argv[0]);
+
+      case FAULT_NOINST:
+
+        FATAL("No instrumentation detected");
+
+      case FAULT_NOBITS: 
+
+        ++useless_at_start;
+
+        if (!in_bitmap && !shuffle_queue)
+          WARNF("No new instrumentation output, test case may be useless.");
+
+        break;
+
+    }
+
+    if (q->var_behavior) WARNF("Instrumentation output varies across runs.");
+
+    q = q->next;
+
+  }
+
+  if (cal_failures) {
+
+    if (cal_failures == queued_paths)
+      FATAL("All test cases time out%s, giving up!",
+            skip_crashes ? " or crash" : "");
+
+    WARNF("Skipped %u test cases (%0.02f%%) due to timeouts%s.", cal_failures,
+          ((double)cal_failures) * 100 / queued_paths,
+          skip_crashes ? " or crashes" : "");
+
+    if (cal_failures * 5 > queued_paths)
+      WARNF(cLRD "High percentage of rejected test cases, check settings!");
+
+  }
+
+  OKF("All test cases processed.");
+
+}
+
+
+/* Helper function: link() if possible, copy otherwise. */
+
+static void link_or_copy(u8* old_path, u8* new_path) {
+
+  s32 i = link(old_path, new_path);
+  s32 sfd, dfd;
+  u8* tmp;
+
+  if (!i) return;
+
+  sfd = open(old_path, O_RDONLY);
+  if (sfd < 0) PFATAL("Unable to open '%s'", old_path);
+
+  dfd = open(new_path, O_WRONLY | O_CREAT | O_EXCL, 0600);
+  if (dfd < 0) PFATAL("Unable to create '%s'", new_path);
+
+  tmp = ck_alloc(64 * 1024);
+
+  while ((i = read(sfd, tmp, 64 * 1024)) > 0) 
+    ck_write(dfd, tmp, i, new_path);
+
+  if (i < 0) PFATAL("read() failed");
+
+  ck_free(tmp);
+  close(sfd);
+  close(dfd);
+
+}
+
+
+/* Create hard links for input test cases in the output directory, choosing
+   good names and pivoting accordingly. */
+
+void pivot_inputs(void) {
+
+  struct queue_entry* q = queue;
+  u32 id = 0;
+
+  ACTF("Creating hard links for all input files...");
+
+  while (q) {
+
+    u8  *nfn, *rsl = strrchr(q->fname, '/');
+    u32 orig_id;
+
+    if (!rsl) rsl = q->fname; else ++rsl;
+
+    /* If the original file name conforms to the syntax and the recorded
+       ID matches the one we'd assign, just use the original file name.
+       This is valuable for resuming fuzzing runs. */
+
+    if (!strncmp(rsl, CASE_PREFIX, 3) &&
+        sscanf(rsl + 3, "%06u", &orig_id) == 1 && orig_id == id) {
+
+      u8* src_str;
+      u32 src_id;
+
+      resuming_fuzz = 1;
+      nfn = alloc_printf("%s/queue/%s", out_dir, rsl);
+
+      /* Since we're at it, let's also try to find parent and figure out the
+         appropriate depth for this entry. */
+
+      src_str = strchr(rsl + 3, ':');
+
+      if (src_str && sscanf(src_str + 1, "%06u", &src_id) == 1) {
+
+        struct queue_entry* s = queue;
+        while (src_id-- && s) s = s->next;
+        if (s) q->depth = s->depth + 1;
+
+        if (max_depth < q->depth) max_depth = q->depth;
+
+      }
+
+    } else {
+
+      /* No dice - invent a new name, capturing the original one as a
+         substring. */
+
+#ifndef SIMPLE_FILES
+
+      u8* use_name = strstr(rsl, ",orig:");
+
+      if (use_name) use_name += 6; else use_name = rsl;
+      nfn = alloc_printf("%s/queue/id:%06u,orig:%s", out_dir, id, use_name);
+
+#else
+
+      nfn = alloc_printf("%s/queue/id_%06u", out_dir, id);
+
+#endif /* ^!SIMPLE_FILES */
+
+    }
+
+    /* Pivot to the new queue entry. */
+
+    link_or_copy(q->fname, nfn);
+    ck_free(q->fname);
+    q->fname = nfn;
+
+    /* Make sure that the passed_det value carries over, too. */
+
+    if (q->passed_det) mark_as_det_done(q);
+
+    q = q->next;
+    ++id;
+
+  }
+
+  if (in_place_resume) nuke_resume_dir();
+
+}
+
+
+/* When resuming, try to find the queue position to start from. This makes sense
+   only when resuming, and when we can find the original fuzzer_stats. */
+
+u32 find_start_position(void) {
+
+  static u8 tmp[4096]; /* Ought to be enough for anybody. */
+
+  u8  *fn, *off;
+  s32 fd, i;
+  u32 ret;
+
+  if (!resuming_fuzz) return 0;
+
+  if (in_place_resume) fn = alloc_printf("%s/fuzzer_stats", out_dir);
+  else fn = alloc_printf("%s/../fuzzer_stats", in_dir);
+
+  fd = open(fn, O_RDONLY);
+  ck_free(fn);
+
+  if (fd < 0) return 0;
+
+  i = read(fd, tmp, sizeof(tmp) - 1); (void)i; /* Ignore errors */
+  close(fd);
+
+  off = strstr(tmp, "cur_path          : ");
+  if (!off) return 0;
+
+  ret = atoi(off + 20);
+  if (ret >= queued_paths) ret = 0;
+  return ret;
+
+}
+
+
+/* The same, but for timeouts. The idea is that when resuming sessions without
+   -t given, we don't want to keep auto-scaling the timeout over and over
+   again to prevent it from growing due to random flukes. */
+
+void find_timeout(void) {
+
+  static u8 tmp[4096]; /* Ought to be enough for anybody. */
+
+  u8  *fn, *off;
+  s32 fd, i;
+  u32 ret;
+
+  if (!resuming_fuzz) return;
+
+  if (in_place_resume) fn = alloc_printf("%s/fuzzer_stats", out_dir);
+  else fn = alloc_printf("%s/../fuzzer_stats", in_dir);
+
+  fd = open(fn, O_RDONLY);
+  ck_free(fn);
+
+  if (fd < 0) return;
+
+  i = read(fd, tmp, sizeof(tmp) - 1); (void)i; /* Ignore errors */
+  close(fd);
+
+  off = strstr(tmp, "exec_timeout   : ");
+  if (!off) return;
+
+  ret = atoi(off + 17);
+  if (ret <= 4) return;
+
+  exec_tmout = ret;
+  timeout_given = 3;
+
+}
+
+
+
+/* A helper function for maybe_delete_out_dir(), deleting all prefixed
+   files in a directory. */
+
+static u8 delete_files(u8* path, u8* prefix) {
+
+  DIR* d;
+  struct dirent* d_ent;
+
+  d = opendir(path);
+
+  if (!d) return 0;
+
+  while ((d_ent = readdir(d))) {
+
+    if (d_ent->d_name[0] != '.' && (!prefix ||
+        !strncmp(d_ent->d_name, prefix, strlen(prefix)))) {
+
+      u8* fname = alloc_printf("%s/%s", path, d_ent->d_name);
+      if (unlink(fname)) PFATAL("Unable to delete '%s'", fname);
+      ck_free(fname);
+
+    }
+
+  }
+
+  closedir(d);
+
+  return !!rmdir(path);
+
+}
+
+
+/* Get the number of runnable processes, with some simple smoothing. */
+
+double get_runnable_processes(void) {
+
+  static double res;
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__)
+
+  /* I don't see any portable sysctl or so that would quickly give us the
+     number of runnable processes; the 1-minute load average can be a
+     semi-decent approximation, though. */
+
+  if (getloadavg(&res, 1) != 1) return 0;
+
+#else
+
+  /* On Linux, /proc/stat is probably the best way; load averages are
+     computed in funny ways and sometimes don't reflect extremely short-lived
+     processes well. */
+
+  FILE* f = fopen("/proc/stat", "r");
+  u8 tmp[1024];
+  u32 val = 0;
+
+  if (!f) return 0;
+
+  while (fgets(tmp, sizeof(tmp), f)) {
+
+    if (!strncmp(tmp, "procs_running ", 14) ||
+        !strncmp(tmp, "procs_blocked ", 14)) val += atoi(tmp + 14);
+
+  }
+ 
+  fclose(f);
+
+  if (!res) {
+
+    res = val;
+
+  } else {
+
+    res = res * (1.0 - 1.0 / AVG_SMOOTHING) +
+          ((double)val) * (1.0 / AVG_SMOOTHING);
+
+  }
+
+#endif /* ^(__APPLE__ || __FreeBSD__ || __OpenBSD__) */
+
+  return res;
+
+}
+
+
+/* Delete the temporary directory used for in-place session resume. */
+
+void nuke_resume_dir(void) {
+
+  u8* fn;
+
+  fn = alloc_printf("%s/_resume/.state/deterministic_done", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/_resume/.state/auto_extras", out_dir);
+  if (delete_files(fn, "auto_")) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/_resume/.state/redundant_edges", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/_resume/.state/variable_behavior", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/_resume/.state", out_dir);
+  if (rmdir(fn) && errno != ENOENT) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/_resume", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  return;
+
+dir_cleanup_failed:
+
+  FATAL("_resume directory cleanup failed");
+
+}
+
+
+/* Delete fuzzer output directory if we recognize it as ours, if the fuzzer
+   is not currently running, and if the last run time isn't too great. */
+
+void maybe_delete_out_dir(void) {
+
+  FILE* f;
+  u8 *fn = alloc_printf("%s/fuzzer_stats", out_dir);
+
+  /* See if the output directory is locked. If yes, bail out. If not,
+     create a lock that will persist for the lifetime of the process
+     (this requires leaving the descriptor open).*/
+
+  out_dir_fd = open(out_dir, O_RDONLY);
+  if (out_dir_fd < 0) PFATAL("Unable to open '%s'", out_dir);
+
+#ifndef __sun
+
+  if (flock(out_dir_fd, LOCK_EX | LOCK_NB) && errno == EWOULDBLOCK) {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "Looks like the job output directory is being actively used by another\n"
+         "    instance of afl-fuzz. You will need to choose a different %s\n"
+         "    or stop the other process first.\n",
+         sync_id ? "fuzzer ID" : "output location");
+
+    FATAL("Directory '%s' is in use", out_dir);
+
+  }
+
+#endif /* !__sun */
+
+  f = fopen(fn, "r");
+
+  if (f) {
+
+    u64 start_time2, last_update;
+
+    if (fscanf(f, "start_time     : %llu\n"
+                  "last_update    : %llu\n", &start_time2, &last_update) != 2)
+      FATAL("Malformed data in '%s'", fn);
+
+    fclose(f);
+
+    /* Let's see how much work is at stake. */
+
+    if (!in_place_resume && last_update - start_time2 > OUTPUT_GRACE * 60) {
+
+      SAYF("\n" cLRD "[-] " cRST
+           "The job output directory already exists and contains the results of more\n"
+           "    than %d minutes worth of fuzzing. To avoid data loss, afl-fuzz will *NOT*\n"
+           "    automatically delete this data for you.\n\n"
+
+           "    If you wish to start a new session, remove or rename the directory manually,\n"
+           "    or specify a different output location for this job. To resume the old\n"
+           "    session, put '-' as the input directory in the command line ('-i -') and\n"
+           "    try again.\n", OUTPUT_GRACE);
+
+       FATAL("At-risk data found in '%s'", out_dir);
+
+    }
+
+  }
+
+  ck_free(fn);
+
+  /* The idea for in-place resume is pretty simple: we temporarily move the old
+     queue/ to a new location that gets deleted once import to the new queue/
+     is finished. If _resume/ already exists, the current queue/ may be
+     incomplete due to an earlier abort, so we want to use the old _resume/
+     dir instead, and we let rename() fail silently. */
+
+  if (in_place_resume) {
+
+    u8* orig_q = alloc_printf("%s/queue", out_dir);
+
+    in_dir = alloc_printf("%s/_resume", out_dir);
+
+    rename(orig_q, in_dir); /* Ignore errors */
+
+    OKF("Output directory exists, will attempt session resume.");
+
+    ck_free(orig_q);
+
+  } else {
+
+    OKF("Output directory exists but deemed OK to reuse.");
+
+  }
+
+  ACTF("Deleting old session data...");
+
+  /* Okay, let's get the ball rolling! First, we need to get rid of the entries
+     in <out_dir>/.synced/.../id:*, if any are present. */
+
+  if (!in_place_resume) {
+
+    fn = alloc_printf("%s/.synced", out_dir);
+    if (delete_files(fn, NULL)) goto dir_cleanup_failed;
+    ck_free(fn);
+
+  }
+
+  /* Next, we need to clean up <out_dir>/queue/.state/ subdirectories: */
+
+  fn = alloc_printf("%s/queue/.state/deterministic_done", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/queue/.state/auto_extras", out_dir);
+  if (delete_files(fn, "auto_")) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/queue/.state/redundant_edges", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/queue/.state/variable_behavior", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  /* Then, get rid of the .state subdirectory itself (should be empty by now)
+     and everything matching <out_dir>/queue/id:*. */
+
+  fn = alloc_printf("%s/queue/.state", out_dir);
+  if (rmdir(fn) && errno != ENOENT) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/queue", out_dir);
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  /* All right, let's do <out_dir>/crashes/id:* and <out_dir>/hangs/id:*. */
+
+  if (!in_place_resume) {
+
+    fn = alloc_printf("%s/crashes/README.txt", out_dir);
+    unlink(fn); /* Ignore errors */
+    ck_free(fn);
+
+  }
+
+  fn = alloc_printf("%s/crashes", out_dir);
+
+  /* Make backup of the crashes directory if it's not empty and if we're
+     doing in-place resume. */
+
+  if (in_place_resume && rmdir(fn)) {
+
+    time_t cur_t = time(0);
+    struct tm* t = localtime(&cur_t);
+
+#ifndef SIMPLE_FILES
+
+    u8* nfn = alloc_printf("%s.%04d-%02d-%02d-%02d:%02d:%02d", fn,
+                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
+                           t->tm_hour, t->tm_min, t->tm_sec);
+
+#else
+
+    u8* nfn = alloc_printf("%s_%04d%02d%02d%02d%02d%02d", fn,
+                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
+                           t->tm_hour, t->tm_min, t->tm_sec);
+
+#endif /* ^!SIMPLE_FILES */
+
+    rename(fn, nfn); /* Ignore errors. */
+    ck_free(nfn);
+
+  }
+
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/hangs", out_dir);
+
+  /* Backup hangs, too. */
+
+  if (in_place_resume && rmdir(fn)) {
+
+    time_t cur_t = time(0);
+    struct tm* t = localtime(&cur_t);
+
+#ifndef SIMPLE_FILES
+
+    u8* nfn = alloc_printf("%s.%04d-%02d-%02d-%02d:%02d:%02d", fn,
+                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
+                           t->tm_hour, t->tm_min, t->tm_sec);
+
+#else
+
+    u8* nfn = alloc_printf("%s_%04d%02d%02d%02d%02d%02d", fn,
+                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
+                           t->tm_hour, t->tm_min, t->tm_sec);
+
+#endif /* ^!SIMPLE_FILES */
+
+    rename(fn, nfn); /* Ignore errors. */
+    ck_free(nfn);
+
+  }
+
+  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  /* And now, for some finishing touches. */
+
+  if (file_extension) {
+    fn = alloc_printf("%s/.cur_input.%s", out_dir, file_extension);
+  } else {
+    fn = alloc_printf("%s/.cur_input", out_dir);
+  }
+
+  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/fuzz_bitmap", out_dir);
+  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  if (!in_place_resume) {
+    fn  = alloc_printf("%s/fuzzer_stats", out_dir);
+    if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
+    ck_free(fn);
+  }
+
+  fn = alloc_printf("%s/plot_data", out_dir);
+  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  fn = alloc_printf("%s/cmdline", out_dir);
+  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
+  ck_free(fn);
+
+  OKF("Output dir cleanup successful.");
+
+  /* Wow... is that all? If yes, celebrate! */
+
+  return;
+
+dir_cleanup_failed:
+
+  SAYF("\n" cLRD "[-] " cRST
+       "Whoops, the fuzzer tried to reuse your output directory, but bumped into\n"
+       "    some files that shouldn't be there or that couldn't be removed - so it\n"
+       "    decided to abort! This happened while processing this path:\n\n"
+
+       "    %s\n\n"
+       "    Please examine and manually delete the files, or specify a different\n"
+       "    output location for the tool.\n", fn);
+
+  FATAL("Output directory cleanup failed");
+
+}
+
+
+/* Prepare output directories and fds. */
+
+void setup_dirs_fds(void) {
+
+  u8* tmp;
+  s32 fd;
+
+  ACTF("Setting up output directories...");
+
+  if (sync_id && mkdir(sync_dir, 0700) && errno != EEXIST)
+      PFATAL("Unable to create '%s'", sync_dir);
+
+  if (mkdir(out_dir, 0700)) {
+
+    if (errno != EEXIST) PFATAL("Unable to create '%s'", out_dir);
+
+    maybe_delete_out_dir();
+
+  } else {
+
+    if (in_place_resume)
+      FATAL("Resume attempted but old output directory not found");
+
+    out_dir_fd = open(out_dir, O_RDONLY);
+
+#ifndef __sun
+
+    if (out_dir_fd < 0 || flock(out_dir_fd, LOCK_EX | LOCK_NB))
+      PFATAL("Unable to flock() output directory.");
+
+#endif /* !__sun */
+
+  }
+
+  /* Queue directory for any starting & discovered paths. */
+
+  tmp = alloc_printf("%s/queue", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* Top-level directory for queue metadata used for session
+     resume and related tasks. */
+
+  tmp = alloc_printf("%s/queue/.state/", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* Directory for flagging queue entries that went through
+     deterministic fuzzing in the past. */
+
+  tmp = alloc_printf("%s/queue/.state/deterministic_done/", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* Directory with the auto-selected dictionary entries. */
+
+  tmp = alloc_printf("%s/queue/.state/auto_extras/", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* The set of paths currently deemed redundant. */
+
+  tmp = alloc_printf("%s/queue/.state/redundant_edges/", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* The set of paths showing variable behavior. */
+
+  tmp = alloc_printf("%s/queue/.state/variable_behavior/", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* Sync directory for keeping track of cooperating fuzzers. */
+
+  if (sync_id) {
+
+    tmp = alloc_printf("%s/.synced/", out_dir);
+
+    if (mkdir(tmp, 0700) && (!in_place_resume || errno != EEXIST))
+      PFATAL("Unable to create '%s'", tmp);
+
+    ck_free(tmp);
+
+  }
+
+  /* All recorded crashes. */
+
+  tmp = alloc_printf("%s/crashes", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* All recorded hangs. */
+
+  tmp = alloc_printf("%s/hangs", out_dir);
+  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  /* Generally useful file descriptors. */
+
+  dev_null_fd = open("/dev/null", O_RDWR);
+  if (dev_null_fd < 0) PFATAL("Unable to open /dev/null");
+
+#ifndef HAVE_ARC4RANDOM
+  dev_urandom_fd = open("/dev/urandom", O_RDONLY);
+  if (dev_urandom_fd < 0) PFATAL("Unable to open /dev/urandom");
+#endif
+
+  /* Gnuplot output file. */
+
+  tmp = alloc_printf("%s/plot_data", out_dir);
+  fd = open(tmp, O_WRONLY | O_CREAT | O_EXCL, 0600);
+  if (fd < 0) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  plot_file = fdopen(fd, "w");
+  if (!plot_file) PFATAL("fdopen() failed");
+
+  fprintf(plot_file, "# unix_time, cycles_done, cur_path, paths_total, "
+                     "pending_total, pending_favs, map_size, unique_crashes, "
+                     "unique_hangs, max_depth, execs_per_sec\n");
+                     /* ignore errors */
+
+}
+
+void setup_cmdline_file(char** argv) {
+  u8* tmp;
+  s32 fd;
+  u32 i = 0;
+
+  FILE* cmdline_file = NULL;
+
+  /* Store the command line to reproduce our findings */
+  tmp = alloc_printf("%s/cmdline", out_dir);
+  fd = open(tmp, O_WRONLY | O_CREAT | O_EXCL, 0600);
+  if (fd < 0) PFATAL("Unable to create '%s'", tmp);
+  ck_free(tmp);
+
+  cmdline_file = fdopen(fd, "w");
+  if (!cmdline_file) PFATAL("fdopen() failed");
+
+  while (argv[i]) {
+    fprintf(cmdline_file, "%s\n", argv[i]);
+    ++i;
+  }
+
+  fclose(cmdline_file);
+}
+
+
+/* Setup the output file for fuzzed data, if not using -f. */
+
+void setup_stdio_file(void) {
+
+  u8* fn;
+  if (file_extension) {
+    fn = alloc_printf("%s/.cur_input.%s", out_dir, file_extension);
+  } else {
+    fn = alloc_printf("%s/.cur_input", out_dir);
+  }
+
+  unlink(fn); /* Ignore errors */
+
+  out_fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
+
+  if (out_fd < 0) PFATAL("Unable to create '%s'", fn);
+
+  ck_free(fn);
+
+}
+
+
+/* Make sure that core dumps don't go to a program. */
+
+void check_crash_handling(void) {
+
+#ifdef __APPLE__
+
+  /* Yuck! There appears to be no simple C API to query for the state of 
+     loaded daemons on MacOS X, and I'm a bit hesitant to do something
+     more sophisticated, such as disabling crash reporting via Mach ports,
+     until I get a box to test the code. So, for now, we check for crash
+     reporting the awful way. */
+  
+  if (system("launchctl list 2>/dev/null | grep -q '\\.ReportCrash$'")) return;
+
+  SAYF("\n" cLRD "[-] " cRST
+       "Whoops, your system is configured to forward crash notifications to an\n"
+       "    external crash reporting utility. This will cause issues due to the\n"
+       "    extended delay between the fuzzed binary malfunctioning and this fact\n"
+       "    being relayed to the fuzzer via the standard waitpid() API.\n\n"
+       "    To avoid having crashes misinterpreted as timeouts, please run the\n" 
+       "    following commands:\n\n"
+
+       "    SL=/System/Library; PL=com.apple.ReportCrash\n"
+       "    launchctl unload -w ${SL}/LaunchAgents/${PL}.plist\n"
+       "    sudo launchctl unload -w ${SL}/LaunchDaemons/${PL}.Root.plist\n");
+
+  if (!getenv("AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES"))
+    FATAL("Crash reporter detected");
+
+#else
+
+  /* This is Linux specific, but I don't think there's anything equivalent on
+     *BSD, so we can just let it slide for now. */
+
+  s32 fd = open("/proc/sys/kernel/core_pattern", O_RDONLY);
+  u8  fchar;
+
+  if (fd < 0) return;
+
+  ACTF("Checking core_pattern...");
+
+  if (read(fd, &fchar, 1) == 1 && fchar == '|') {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "Hmm, your system is configured to send core dump notifications to an\n"
+         "    external utility. This will cause issues: there will be an extended delay\n"
+         "    between stumbling upon a crash and having this information relayed to the\n"
+         "    fuzzer via the standard waitpid() API.\n\n"
+
+         "    To avoid having crashes misinterpreted as timeouts, please log in as root\n" 
+         "    and temporarily modify /proc/sys/kernel/core_pattern, like so:\n\n"
+
+         "    echo core >/proc/sys/kernel/core_pattern\n");
+
+    if (!getenv("AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES"))
+      FATAL("Pipe at the beginning of 'core_pattern'");
+
+  }
+ 
+  close(fd);
+
+#endif /* ^__APPLE__ */
+
+}
+
+
+/* Check CPU governor. */
+
+void check_cpu_governor(void) {
+#ifdef __linux__
+  FILE* f;
+  u8 tmp[128];
+  u64 min = 0, max = 0;
+
+  if (getenv("AFL_SKIP_CPUFREQ")) return;
+
+  if (cpu_aff > 0)
+    snprintf(tmp, sizeof(tmp), "%s%d%s", "/sys/devices/system/cpu/cpu", cpu_aff, "/cpufreq/scaling_governor");
+  else
+    snprintf(tmp, sizeof(tmp), "%s", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor");
+  f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", "r");
+  if (!f) {
+    if (cpu_aff > 0)
+      snprintf(tmp, sizeof(tmp), "%s%d%s", "/sys/devices/system/cpu/cpufreq/policy", cpu_aff, "/scaling_governor");
+    else
+      snprintf(tmp, sizeof(tmp), "%s", "/sys/devices/system/cpu/cpufreq/policy0/scaling_governor");
+    f = fopen(tmp, "r");
+  }
+  if (!f) {
+    WARNF("Could not check CPU scaling governor");
+    return;
+  }
+
+  ACTF("Checking CPU scaling governor...");
+
+  if (!fgets(tmp, 128, f)) PFATAL("fgets() failed");
+
+  fclose(f);
+
+  if (!strncmp(tmp, "perf", 4)) return;
+
+  f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq", "r");
+
+  if (f) {
+    if (fscanf(f, "%llu", &min) != 1) min = 0;
+    fclose(f);
+  }
+
+  f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq", "r");
+
+  if (f) {
+    if (fscanf(f, "%llu", &max) != 1) max = 0;
+    fclose(f);
+  }
+
+  if (min == max) return;
+
+  SAYF("\n" cLRD "[-] " cRST
+       "Whoops, your system uses on-demand CPU frequency scaling, adjusted\n"
+       "    between %llu and %llu MHz. Unfortunately, the scaling algorithm in the\n"
+       "    kernel is imperfect and can miss the short-lived processes spawned by\n"
+       "    afl-fuzz. To keep things moving, run these commands as root:\n\n"
+
+       "    cd /sys/devices/system/cpu\n"
+       "    echo performance | tee cpu*/cpufreq/scaling_governor\n\n"
+
+       "    You can later go back to the original state by replacing 'performance' with\n"
+       "    'ondemand'. If you don't want to change the settings, set AFL_SKIP_CPUFREQ\n"
+       "    to make afl-fuzz skip this check - but expect some performance drop.\n",
+       min / 1024, max / 1024);
+
+  FATAL("Suboptimal CPU scaling governor");
+#endif
+}
+
+
+/* Count the number of logical CPU cores. */
+
+void get_core_count(void) {
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__)
+
+  size_t s = sizeof(cpu_core_count);
+
+  /* On *BSD systems, we can just use a sysctl to get the number of CPUs. */
+
+#ifdef __APPLE__
+
+  if (sysctlbyname("hw.logicalcpu", &cpu_core_count, &s, NULL, 0) < 0)
+    return;
+
+#else
+
+  int s_name[2] = { CTL_HW, HW_NCPU };
+
+  if (sysctl(s_name, 2, &cpu_core_count, &s, NULL, 0) < 0) return;
+
+#endif /* ^__APPLE__ */
+
+#else
+
+#ifdef HAVE_AFFINITY
+
+  cpu_core_count = sysconf(_SC_NPROCESSORS_ONLN);
+
+#else
+
+  FILE* f = fopen("/proc/stat", "r");
+  u8 tmp[1024];
+
+  if (!f) return;
+
+  while (fgets(tmp, sizeof(tmp), f))
+    if (!strncmp(tmp, "cpu", 3) && isdigit(tmp[3])) ++cpu_core_count;
+
+  fclose(f);
+
+#endif /* ^HAVE_AFFINITY */
+
+#endif /* ^(__APPLE__ || __FreeBSD__ || __OpenBSD__) */
+
+  if (cpu_core_count > 0) {
+
+    u32 cur_runnable = 0;
+
+    cur_runnable = (u32)get_runnable_processes();
+
+#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__)
+
+    /* Add ourselves, since the 1-minute average doesn't include that yet. */
+
+    ++cur_runnable;
+
+#endif /* __APPLE__ || __FreeBSD__ || __OpenBSD__ */
+
+    OKF("You have %d CPU core%s and %u runnable tasks (utilization: %0.0f%%).",
+        cpu_core_count, cpu_core_count > 1 ? "s" : "",
+        cur_runnable, cur_runnable * 100.0 / cpu_core_count);
+
+    if (cpu_core_count > 1) {
+
+      if (cur_runnable > cpu_core_count * 1.5) {
+
+        WARNF("System under apparent load, performance may be spotty.");
+
+      } else if (cur_runnable + 1 <= cpu_core_count) {
+
+        OKF("Try parallel jobs - see %s/parallel_fuzzing.txt.", doc_path);
+  
+      }
+
+    }
+
+  } else {
+
+    cpu_core_count = 0;
+    WARNF("Unable to figure out the number of CPU cores.");
+
+  }
+
+}
+
+
+/* Validate and fix up out_dir and sync_dir when using -S. */
+
+void fix_up_sync(void) {
+
+  u8* x = sync_id;
+
+  if (dumb_mode)
+    FATAL("-S / -M and -n are mutually exclusive");
+
+  if (skip_deterministic) {
+
+    if (force_deterministic)
+      FATAL("use -S instead of -M -d");
+    //else
+    //  FATAL("-S already implies -d");
+
+  }
+
+  while (*x) {
+
+    if (!isalnum(*x) && *x != '_' && *x != '-')
+      FATAL("Non-alphanumeric fuzzer ID specified via -S or -M");
+
+    ++x;
+
+  }
+
+  if (strlen(sync_id) > 32) FATAL("Fuzzer ID too long");
+
+  x = alloc_printf("%s/%s", out_dir, sync_id);
+
+  sync_dir = out_dir;
+  out_dir  = x;
+
+  if (!force_deterministic) {
+    skip_deterministic = 1;
+    use_splicing = 1;
+  }
+
+}
+
+
+/* Handle screen resize (SIGWINCH). */
+
+static void handle_resize(int sig) {
+  clear_screen = 1;
+}
+
+
+/* Check ASAN options. */
+
+void check_asan_opts(void) {
+  u8* x = getenv("ASAN_OPTIONS");
+
+  if (x) {
+
+    if (!strstr(x, "abort_on_error=1"))
+      FATAL("Custom ASAN_OPTIONS set without abort_on_error=1 - please fix!");
+
+    if (!strstr(x, "symbolize=0"))
+      FATAL("Custom ASAN_OPTIONS set without symbolize=0 - please fix!");
+
+  }
+
+  x = getenv("MSAN_OPTIONS");
+
+  if (x) {
+
+    if (!strstr(x, "exit_code=" STRINGIFY(MSAN_ERROR)))
+      FATAL("Custom MSAN_OPTIONS set without exit_code="
+            STRINGIFY(MSAN_ERROR) " - please fix!");
+
+    if (!strstr(x, "symbolize=0"))
+      FATAL("Custom MSAN_OPTIONS set without symbolize=0 - please fix!");
+
+  }
+
+} 
+
+
+/* Handle stop signal (Ctrl-C, etc). */
+
+static void handle_stop_sig(int sig) {
+
+  stop_soon = 1; 
+
+  if (child_pid > 0) kill(child_pid, SIGKILL);
+  if (forksrv_pid > 0) kill(forksrv_pid, SIGKILL);
+
+}
+
+
+/* Handle skip request (SIGUSR1). */
+
+static void handle_skipreq(int sig) {
+
+  skip_requested = 1;
+
+}
+
+
+/* Do a PATH search and find target binary to see that it exists and
+   isn't a shell script - a common and painful mistake. We also check for
+   a valid ELF header and for evidence of AFL instrumentation. */
+
+void check_binary(u8* fname) {
+
+  u8* env_path = 0;
+  struct stat st;
+
+  s32 fd;
+  u8* f_data;
+  u32 f_len = 0;
+
+  ACTF("Validating target binary...");
+
+  if (strchr(fname, '/') || !(env_path = getenv("PATH"))) {
+
+    target_path = ck_strdup(fname);
+    if (stat(target_path, &st) || !S_ISREG(st.st_mode) ||
+        !(st.st_mode & 0111) || (f_len = st.st_size) < 4)
+      FATAL("Program '%s' not found or not executable", fname);
+
+  } else {
+
+    while (env_path) {
+
+      u8 *cur_elem, *delim = strchr(env_path, ':');
+
+      if (delim) {
+
+        cur_elem = ck_alloc(delim - env_path + 1);
+        memcpy(cur_elem, env_path, delim - env_path);
+        ++delim;
+
+      } else cur_elem = ck_strdup(env_path);
+
+      env_path = delim;
+
+      if (cur_elem[0])
+        target_path = alloc_printf("%s/%s", cur_elem, fname);
+      else
+        target_path = ck_strdup(fname);
+
+      ck_free(cur_elem);
+
+      if (!stat(target_path, &st) && S_ISREG(st.st_mode) &&
+          (st.st_mode & 0111) && (f_len = st.st_size) >= 4) break;
+
+      ck_free(target_path);
+      target_path = 0;
+
+    }
+
+    if (!target_path) FATAL("Program '%s' not found or not executable", fname);
+
+  }
+
+  if (getenv("AFL_SKIP_BIN_CHECK")) return;
+
+  /* Check for blatant user errors. */
+
+  if ((!strncmp(target_path, "/tmp/", 5) && !strchr(target_path + 5, '/')) ||
+      (!strncmp(target_path, "/var/tmp/", 9) && !strchr(target_path + 9, '/')))
+     FATAL("Please don't keep binaries in /tmp or /var/tmp");
+
+  fd = open(target_path, O_RDONLY);
+
+  if (fd < 0) PFATAL("Unable to open '%s'", target_path);
+
+  f_data = mmap(0, f_len, PROT_READ, MAP_PRIVATE, fd, 0);
+
+  if (f_data == MAP_FAILED) PFATAL("Unable to mmap file '%s'", target_path);
+
+  close(fd);
+
+  if (f_data[0] == '#' && f_data[1] == '!') {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "Oops, the target binary looks like a shell script. Some build systems will\n"
+         "    sometimes generate shell stubs for dynamically linked programs; try static\n"
+         "    library mode (./configure --disable-shared) if that's the case.\n\n"
+
+         "    Another possible cause is that you are actually trying to use a shell\n" 
+         "    wrapper around the fuzzed component. Invoking shell can slow down the\n" 
+         "    fuzzing process by a factor of 20x or more; it's best to write the wrapper\n"
+         "    in a compiled language instead.\n");
+
+    FATAL("Program '%s' is a shell script", target_path);
+
+  }
+
+#ifndef __APPLE__
+
+  if (f_data[0] != 0x7f || memcmp(f_data + 1, "ELF", 3))
+    FATAL("Program '%s' is not an ELF binary", target_path);
+
+#else
+
+#if !defined(__arm__) && !defined(__arm64__)
+  if (f_data[0] != 0xCF || f_data[1] != 0xFA || f_data[2] != 0xED)
+    FATAL("Program '%s' is not a 64-bit Mach-O binary", target_path);
+#endif
+
+#endif /* ^!__APPLE__ */
+
+  if (!qemu_mode && !unicorn_mode && !dumb_mode &&
+      !memmem(f_data, f_len, SHM_ENV_VAR, strlen(SHM_ENV_VAR) + 1)) {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "Looks like the target binary is not instrumented! The fuzzer depends on\n"
+         "    compile-time instrumentation to isolate interesting test cases while\n"
+         "    mutating the input data. For more information, and for tips on how to\n"
+         "    instrument binaries, please see %s/README.\n\n"
+
+         "    When source code is not available, you may be able to leverage QEMU\n"
+         "    mode support. Consult the README for tips on how to enable this.\n"
+
+         "    (It is also possible to use afl-fuzz as a traditional, \"dumb\" fuzzer.\n"
+         "    For that, you can use the -n option - but expect much worse results.)\n",
+         doc_path);
+
+    FATAL("No instrumentation detected");
+
+  }
+
+  if ((qemu_mode || unicorn_mode) &&
+      memmem(f_data, f_len, SHM_ENV_VAR, strlen(SHM_ENV_VAR) + 1)) {
+
+    SAYF("\n" cLRD "[-] " cRST
+         "This program appears to be instrumented with afl-gcc, but is being run in\n"
+         "    QEMU or Unicorn mode (-Q or -U). This is probably not what you want -\n"
+         "    this setup will be slow and offer no practical benefits.\n");
+
+    FATAL("Instrumentation found in -Q or -U mode");
+
+  }
+
+  if (memmem(f_data, f_len, "libasan.so", 10) ||
+      memmem(f_data, f_len, "__msan_init", 11)) uses_asan = 1;
+
+  /* Detect persistent & deferred init signatures in the binary. */
+
+  if (memmem(f_data, f_len, PERSIST_SIG, strlen(PERSIST_SIG) + 1)) {
+
+    OKF(cPIN "Persistent mode binary detected.");
+    setenv(PERSIST_ENV_VAR, "1", 1);
+    persistent_mode = 1;
+
+  } else if (getenv("AFL_PERSISTENT")) {
+
+    WARNF("AFL_PERSISTENT is no longer supported and may misbehave!");
+
+  }
+
+  if (memmem(f_data, f_len, DEFER_SIG, strlen(DEFER_SIG) + 1)) {
+
+    OKF(cPIN "Deferred forkserver binary detected.");
+    setenv(DEFER_ENV_VAR, "1", 1);
+    deferred_mode = 1;
+
+  } else if (getenv("AFL_DEFER_FORKSRV")) {
+
+    WARNF("AFL_DEFER_FORKSRV is no longer supported and may misbehave!");
+
+  }
+
+  if (munmap(f_data, f_len)) PFATAL("unmap() failed");
+
+}
+
+
+/* Trim and possibly create a banner for the run. */
+
+void fix_up_banner(u8* name) {
+
+  if (!use_banner) {
+
+    if (sync_id) {
+
+      use_banner = sync_id;
+
+    } else {
+
+      u8* trim = strrchr(name, '/');
+      if (!trim) use_banner = name; else use_banner = trim + 1;
+
+    }
+
+  }
+
+  if (strlen(use_banner) > 32) {
+
+    u8* tmp = ck_alloc(36);
+    sprintf(tmp, "%.32s...", use_banner);
+    use_banner = tmp;
+
+  }
+
+}
+
+
+/* Check if we're on TTY. */
+
+void check_if_tty(void) {
+
+  struct winsize ws;
+
+  if (getenv("AFL_NO_UI")) {
+    OKF("Disabling the UI because AFL_NO_UI is set.");
+    not_on_tty = 1;
+    return;
+  }
+
+  if (ioctl(1, TIOCGWINSZ, &ws)) {
+
+    if (errno == ENOTTY) {
+      OKF("Looks like we're not running on a tty, so I'll be a bit less verbose.");
+      not_on_tty = 1;
+    }
+
+    return;
+  }
+
+}
+
+
+/* Set up signal handlers. More complicated that needs to be, because libc on
+   Solaris doesn't resume interrupted reads(), sets SA_RESETHAND when you call
+   siginterrupt(), and does other stupid things. */
+
+void setup_signal_handlers(void) {
+
+  struct sigaction sa;
+
+  sa.sa_handler   = NULL;
+  sa.sa_flags     = SA_RESTART;
+  sa.sa_sigaction = NULL;
+
+  sigemptyset(&sa.sa_mask);
+
+  /* Various ways of saying "stop". */
+
+  sa.sa_handler = handle_stop_sig;
+  sigaction(SIGHUP, &sa, NULL);
+  sigaction(SIGINT, &sa, NULL);
+  sigaction(SIGTERM, &sa, NULL);
+
+  /* Exec timeout notifications. */
+
+  sa.sa_handler = handle_timeout;
+  sigaction(SIGALRM, &sa, NULL);
+
+  /* Window resize */
+
+  sa.sa_handler = handle_resize;
+  sigaction(SIGWINCH, &sa, NULL);
+
+  /* SIGUSR1: skip entry */
+
+  sa.sa_handler = handle_skipreq;
+  sigaction(SIGUSR1, &sa, NULL);
+
+  /* Things we don't care about. */
+
+  sa.sa_handler = SIG_IGN;
+  sigaction(SIGTSTP, &sa, NULL);
+  sigaction(SIGPIPE, &sa, NULL);
+
+}
+
+
+/* Rewrite argv for QEMU. */
+
+char** get_qemu_argv(u8* own_loc, char** argv, int argc) {
+
+  char** new_argv = ck_alloc(sizeof(char*) * (argc + 4));
+  u8 *tmp, *cp, *rsl, *own_copy;
+
+  memcpy(new_argv + 3, argv + 1, sizeof(char*) * argc);
+
+  new_argv[2] = target_path;
+  new_argv[1] = "--";
+
+  /* Now we need to actually find the QEMU binary to put in argv[0]. */
+
+  tmp = getenv("AFL_PATH");
+
+  if (tmp) {
+
+    cp = alloc_printf("%s/afl-qemu-trace", tmp);
+
+    if (access(cp, X_OK))
+      FATAL("Unable to find '%s'", tmp);
+
+    target_path = new_argv[0] = cp;
+    return new_argv;
+
+  }
+
+  own_copy = ck_strdup(own_loc);
+  rsl = strrchr(own_copy, '/');
+
+  if (rsl) {
+
+    *rsl = 0;
+
+    cp = alloc_printf("%s/afl-qemu-trace", own_copy);
+    ck_free(own_copy);
+
+    if (!access(cp, X_OK)) {
+
+      target_path = new_argv[0] = cp;
+      return new_argv;
+
+    }
+
+  } else ck_free(own_copy);
+
+  if (!access(BIN_PATH "/afl-qemu-trace", X_OK)) {
+
+    target_path = new_argv[0] = ck_strdup(BIN_PATH "/afl-qemu-trace");
+    return new_argv;
+
+  }
+
+  SAYF("\n" cLRD "[-] " cRST
+       "Oops, unable to find the 'afl-qemu-trace' binary. The binary must be built\n"
+       "    separately by following the instructions in qemu_mode/README.qemu. If you\n"
+       "    already have the binary installed, you may need to specify AFL_PATH in the\n"
+       "    environment.\n\n"
+
+       "    Of course, even without QEMU, afl-fuzz can still work with binaries that are\n"
+       "    instrumented at compile time with afl-gcc. It is also possible to use it as a\n"
+       "    traditional \"dumb\" fuzzer by specifying '-n' in the command line.\n");
+
+  FATAL("Failed to locate 'afl-qemu-trace'.");
+
+}
+
+/* Make a copy of the current command line. */
+
+void save_cmdline(u32 argc, char** argv) {
+
+  u32 len = 1, i;
+  u8* buf;
+
+  for (i = 0; i < argc; ++i)
+    len += strlen(argv[i]) + 1;
+  
+  buf = orig_cmdline = ck_alloc(len);
+
+  for (i = 0; i < argc; ++i) {
+
+    u32 l = strlen(argv[i]);
+
+    memcpy(buf, argv[i], l);
+    buf += l;
+
+    if (i != argc - 1) *(buf++) = ' ';
+
+  }
+
+  *buf = 0;
+
+}
+
diff --git a/src/afl-fuzz-one.c b/src/afl-fuzz-one.c
new file mode 100644
index 00000000..59370c3d
--- /dev/null
+++ b/src/afl-fuzz-one.c
@@ -0,0 +1,5719 @@
+/*
+   american fuzzy lop - fuzzer code
+   --------------------------------
+
+   Written and maintained by Michal Zalewski <lcamtuf@google.com>
+
+   Forkserver design by Jann Horn <jannhorn@googlemail.com>
+
+   Copyright 2013, 2014, 2015, 2016, 2017 Google Inc. All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   This is the real deal: the program takes an instrumented binary and
+   attempts a variety of basic fuzzing tricks, paying close attention to
+   how they affect the execution path.
+
+ */
+
+#include "afl-fuzz.h"
+
+/* MOpt */
+
+int select_algorithm(void) {
+
+  int i_puppet, j_puppet;
+
+  double sele = ((double)(UR(10000))*0.0001);
+  j_puppet = 0;
+  for (i_puppet = 0; i_puppet < operator_num; ++i_puppet) {
+      if (unlikely(i_puppet == 0)) {
+          if (sele < probability_now[swarm_now][i_puppet])
+            break;
+      } else {
+          if (sele < probability_now[swarm_now][i_puppet]) {
+              j_puppet =1;
+              break;
+          }
+      }
+  }
+  if (j_puppet ==1 && sele < probability_now[swarm_now][i_puppet-1])
+    FATAL("error select_algorithm");
+  return i_puppet;
+}
+
+/* Helper to choose random block len for block operations in fuzz_one().
+   Doesn't return zero, provided that max_len is > 0. */
+
+static u32 choose_block_len(u32 limit) {
+
+  u32 min_value, max_value;
+  u32 rlim = MIN(queue_cycle, 3);
+
+  if (!run_over10m) rlim = 1;
+
+  switch (UR(rlim)) {
+
+    case 0:  min_value = 1;
+             max_value = HAVOC_BLK_SMALL;
+             break;
+
+    case 1:  min_value = HAVOC_BLK_SMALL;
+             max_value = HAVOC_BLK_MEDIUM;
+             break;
+
+    default: 
+
+             if (UR(10)) {
+
+               min_value = HAVOC_BLK_MEDIUM;
+               max_value = HAVOC_BLK_LARGE;
+
+             } else {
+
+               min_value = HAVOC_BLK_LARGE;
+               max_value = HAVOC_BLK_XL;
+
+             }
+
+  }
+
+  if (min_value >= limit) min_value = 1;
+
+  return min_value + UR(MIN(max_value, limit) - min_value + 1);
+
+}
+
+
+/* Helper function to see if a particular change (xor_val = old ^ new) could
+   be a product of deterministic bit flips with the lengths and stepovers
+   attempted by afl-fuzz. This is used to avoid dupes in some of the
+   deterministic fuzzing operations that follow bit flips. We also
+   return 1 if xor_val is zero, which implies that the old and attempted new
+   values are identical and the exec would be a waste of time. */
+
+static u8 could_be_bitflip(u32 xor_val) {
+
+  u32 sh = 0;
+
+  if (!xor_val) return 1;
+
+  /* Shift left until first bit set. */
+
+  while (!(xor_val & 1)) { ++sh; xor_val >>= 1; }
+
+  /* 1-, 2-, and 4-bit patterns are OK anywhere. */
+
+  if (xor_val == 1 || xor_val == 3 || xor_val == 15) return 1;
+
+  /* 8-, 16-, and 32-bit patterns are OK only if shift factor is
+     divisible by 8, since that's the stepover for these ops. */
+
+  if (sh & 7) return 0;
+
+  if (xor_val == 0xff || xor_val == 0xffff || xor_val == 0xffffffff)
+    return 1;
+
+  return 0;
+
+}
+
+
+/* Helper function to see if a particular value is reachable through
+   arithmetic operations. Used for similar purposes. */
+
+static u8 could_be_arith(u32 old_val, u32 new_val, u8 blen) {
+
+  u32 i, ov = 0, nv = 0, diffs = 0;
+
+  if (old_val == new_val) return 1;
+
+  /* See if one-byte adjustments to any byte could produce this result. */
+
+  for (i = 0; i < blen; ++i) {
+
+    u8 a = old_val >> (8 * i),
+       b = new_val >> (8 * i);
+
+    if (a != b) { ++diffs; ov = a; nv = b; }
+
+  }
+
+  /* If only one byte differs and the values are within range, return 1. */
+
+  if (diffs == 1) {
+
+    if ((u8)(ov - nv) <= ARITH_MAX ||
+        (u8)(nv - ov) <= ARITH_MAX) return 1;
+
+  }
+
+  if (blen == 1) return 0;
+
+  /* See if two-byte adjustments to any byte would produce this result. */
+
+  diffs = 0;
+
+  for (i = 0; i < blen / 2; ++i) {
+
+    u16 a = old_val >> (16 * i),
+        b = new_val >> (16 * i);
+
+    if (a != b) { ++diffs; ov = a; nv = b; }
+
+  }
+
+  /* If only one word differs and the values are within range, return 1. */
+
+  if (diffs == 1) {
+
+    if ((u16)(ov - nv) <= ARITH_MAX ||
+        (u16)(nv - ov) <= ARITH_MAX) return 1;
+
+    ov = SWAP16(ov); nv = SWAP16(nv);
+
+    if ((u16)(ov - nv) <= ARITH_MAX ||
+        (u16)(nv - ov) <= ARITH_MAX) return 1;
+
+  }
+
+  /* Finally, let's do the same thing for dwords. */
+
+  if (blen == 4) {
+
+    if ((u32)(old_val - new_val) <= ARITH_MAX ||
+        (u32)(new_val - old_val) <= ARITH_MAX) return 1;
+
+    new_val = SWAP32(new_val);
+    old_val = SWAP32(old_val);
+
+    if ((u32)(old_val - new_val) <= ARITH_MAX ||
+        (u32)(new_val - old_val) <= ARITH_MAX) return 1;
+
+  }
+
+  return 0;
+
+}
+
+
+/* Last but not least, a similar helper to see if insertion of an 
+   interesting integer is redundant given the insertions done for
+   shorter blen. The last param (check_le) is set if the caller
+   already executed LE insertion for current blen and wants to see
+   if BE variant passed in new_val is unique. */
+
+static u8 could_be_interest(u32 old_val, u32 new_val, u8 blen, u8 check_le) {
+
+  u32 i, j;
+
+  if (old_val == new_val) return 1;
+
+  /* See if one-byte insertions from interesting_8 over old_val could
+     produce new_val. */
+
+  for (i = 0; i < blen; ++i) {
+
+    for (j = 0; j < sizeof(interesting_8); ++j) {
+
+      u32 tval = (old_val & ~(0xff << (i * 8))) |
+                 (((u8)interesting_8[j]) << (i * 8));
+
+      if (new_val == tval) return 1;
+
+    }
+
+  }
+
+  /* Bail out unless we're also asked to examine two-byte LE insertions
+     as a preparation for BE attempts. */
+
+  if (blen == 2 && !check_le) return 0;
+
+  /* See if two-byte insertions over old_val could give us new_val. */
+
+  for (i = 0; i < blen - 1; ++i) {
+
+    for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
+
+      u32 tval = (old_val & ~(0xffff << (i * 8))) |
+                 (((u16)interesting_16[j]) << (i * 8));
+
+      if (new_val == tval) return 1;
+
+      /* Continue here only if blen > 2. */
+
+      if (blen > 2) {
+
+        tval = (old_val & ~(0xffff << (i * 8))) |
+               (SWAP16(interesting_16[j]) << (i * 8));
+
+        if (new_val == tval) return 1;
+
+      }
+
+    }
+
+  }
+
+  if (blen == 4 && check_le) {
+
+    /* See if four-byte insertions could produce the same result
+       (LE only). */
+
+    for (j = 0; j < sizeof(interesting_32) / 4; ++j)
+      if (new_val == (u32)interesting_32[j]) return 1;
+
+  }
+
+  return 0;
+
+}
+
+
+#ifndef IGNORE_FINDS
+
+/* Helper function to compare buffers; returns first and last differing offset. We
+   use this to find reasonable locations for splicing two files. */
+
+static void locate_diffs(u8* ptr1, u8* ptr2, u32 len, s32* first, s32* last) {
+
+  s32 f_loc = -1;
+  s32 l_loc = -1;
+  u32 pos;
+
+  for (pos = 0; pos < len; ++pos) {
+
+    if (*(ptr1++) != *(ptr2++)) {
+
+      if (f_loc == -1) f_loc = pos;
+      l_loc = pos;
+
+    }
+
+  }
+
+  *first = f_loc;
+  *last = l_loc;
+
+  return;
+
+}
+
+#endif /* !IGNORE_FINDS */
+
+/* Take the current entry from the queue, fuzz it for a while. This
+   function is a tad too long... returns 0 if fuzzed successfully, 1 if
+   skipped or bailed out. */
+
+u8 fuzz_one_original(char** argv) {
+
+  s32 len, fd, temp_len, i, j;
+  u8  *in_buf, *out_buf, *orig_in, *ex_tmp, *eff_map = 0;
+  u64 havoc_queued = 0,  orig_hit_cnt, new_hit_cnt;
+  u32 splice_cycle = 0, perf_score = 100, orig_perf, prev_cksum, eff_cnt = 1;
+
+  u8  ret_val = 1, doing_det = 0;
+
+  u8  a_collect[MAX_AUTO_EXTRA];
+  u32 a_len = 0;
+
+#ifdef IGNORE_FINDS
+
+  /* In IGNORE_FINDS mode, skip any entries that weren't in the
+     initial data set. */
+
+  if (queue_cur->depth > 1) return 1;
+
+#else
+
+  if (pending_favored) {
+
+    /* If we have any favored, non-fuzzed new arrivals in the queue,
+       possibly skip to them at the expense of already-fuzzed or non-favored
+       cases. */
+
+    if (((queue_cur->was_fuzzed > 0 || queue_cur->fuzz_level > 0) || !queue_cur->favored) &&
+        UR(100) < SKIP_TO_NEW_PROB) return 1;
+
+  } else if (!dumb_mode && !queue_cur->favored && queued_paths > 10) {
+
+    /* Otherwise, still possibly skip non-favored cases, albeit less often.
+       The odds of skipping stuff are higher for already-fuzzed inputs and
+       lower for never-fuzzed entries. */
+
+    if (queue_cycle > 1 && (queue_cur->fuzz_level == 0 || queue_cur->was_fuzzed)) {
+
+      if (UR(100) < SKIP_NFAV_NEW_PROB) return 1;
+
+    } else {
+
+      if (UR(100) < SKIP_NFAV_OLD_PROB) return 1;
+
+    }
+
+  }
+
+#endif /* ^IGNORE_FINDS */
+
+  if (not_on_tty) {
+    ACTF("Fuzzing test case #%u (%u total, %llu uniq crashes found)...",
+         current_entry, queued_paths, unique_crashes);
+    fflush(stdout);
+  }
+
+  /* Map the test case into memory. */
+
+  fd = open(queue_cur->fname, O_RDONLY);
+
+  if (fd < 0) PFATAL("Unable to open '%s'", queue_cur->fname);
+
+  len = queue_cur->len;
+
+  orig_in = in_buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+  if (orig_in == MAP_FAILED) PFATAL("Unable to mmap '%s' with len %d", queue_cur->fname, len);
+
+  close(fd);
+
+  /* We could mmap() out_buf as MAP_PRIVATE, but we end up clobbering every
+     single byte anyway, so it wouldn't give us any performance or memory usage
+     benefits. */
+
+  out_buf = ck_alloc_nozero(len);
+
+  subseq_tmouts = 0;
+
+  cur_depth = queue_cur->depth;
+
+  /*******************************************
+   * CALIBRATION (only if failed earlier on) *
+   *******************************************/
+
+  if (queue_cur->cal_failed) {
+
+    u8 res = FAULT_TMOUT;
+
+    if (queue_cur->cal_failed < CAL_CHANCES) {
+
+      res = calibrate_case(argv, queue_cur, in_buf, queue_cycle - 1, 0);
+
+      if (res == FAULT_ERROR)
+        FATAL("Unable to execute target application");
+
+    }
+
+    if (stop_soon || res != crash_mode) {
+      ++cur_skipped_paths;
+      goto abandon_entry;
+    }
+
+  }
+
+  /************
+   * TRIMMING *
+   ************/
+
+  if (!dumb_mode && !queue_cur->trim_done && !custom_mutator) {
+
+    u8 res = trim_case(argv, queue_cur, in_buf);
+
+    if (res == FAULT_ERROR)
+      FATAL("Unable to execute target application");
+
+    if (stop_soon) {
+      ++cur_skipped_paths;
+      goto abandon_entry;
+    }
+
+    /* Don't retry trimming, even if it failed. */
+
+    queue_cur->trim_done = 1;
+
+    len = queue_cur->len;
+
+  }
+
+  memcpy(out_buf, in_buf, len);
+
+  /*********************
+   * PERFORMANCE SCORE *
+   *********************/
+
+  orig_perf = perf_score = calculate_score(queue_cur);
+
+  if (perf_score == 0) goto abandon_entry;
+
+  if (custom_mutator) {
+    stage_short = "custom";
+    stage_name = "custom mutator";
+    stage_max = len << 3;
+    stage_val_type = STAGE_VAL_NONE;
+
+    const u32 max_seed_size = 4096*4096;
+    u8* mutated_buf = ck_alloc(max_seed_size);
+
+    orig_hit_cnt = queued_paths + unique_crashes;
+
+    for (stage_cur = 0 ; stage_cur < stage_max ; ++stage_cur) {
+      size_t orig_size = (size_t) len;
+      size_t mutated_size = custom_mutator(out_buf, orig_size, mutated_buf, max_seed_size, UR(UINT32_MAX));
+      if (mutated_size > 0) {
+        out_buf = ck_realloc(out_buf, mutated_size);
+        memcpy(out_buf, mutated_buf, mutated_size);
+        if (common_fuzz_stuff(argv, out_buf, (u32) mutated_size)) {
+          goto abandon_entry;
+        }
+      }
+    }
+
+    ck_free(mutated_buf);
+    new_hit_cnt = queued_paths + unique_crashes;
+
+    stage_finds[STAGE_CUSTOM_MUTATOR]  += new_hit_cnt - orig_hit_cnt;
+    stage_cycles[STAGE_CUSTOM_MUTATOR] += stage_max;
+    goto abandon_entry;
+  }
+
+
+  /* Skip right away if -d is given, if it has not been chosen sufficiently
+     often to warrant the expensive deterministic stage (fuzz_level), or
+     if it has gone through deterministic testing in earlier, resumed runs
+     (passed_det). */
+
+  if (skip_deterministic
+     || ((!queue_cur->passed_det)
+        && perf_score < (
+              queue_cur->depth * 30 <= havoc_max_mult * 100
+              ? queue_cur->depth * 30
+              : havoc_max_mult * 100))
+     || queue_cur->passed_det)
+#ifdef USE_PYTHON
+    goto python_stage;
+#else
+    goto havoc_stage;
+#endif
+
+  /* Skip deterministic fuzzing if exec path checksum puts this out of scope
+     for this master instance. */
+
+  if (master_max && (queue_cur->exec_cksum % master_max) != master_id - 1)
+#ifdef USE_PYTHON
+    goto python_stage;
+#else
+    goto havoc_stage;
+#endif
+
+  doing_det = 1;
+
+  /*********************************************
+   * SIMPLE BITFLIP (+dictionary construction) *
+   *********************************************/
+
+#define FLIP_BIT(_ar, _b) do { \
+    u8* _arf = (u8*)(_ar); \
+    u32 _bf = (_b); \
+    _arf[(_bf) >> 3] ^= (128 >> ((_bf) & 7)); \
+  } while (0)
+
+  /* Single walking bit. */
+
+  stage_short = "flip1";
+  stage_max   = len << 3;
+  stage_name  = "bitflip 1/1";
+
+  stage_val_type = STAGE_VAL_NONE;
+
+  orig_hit_cnt = queued_paths + unique_crashes;
+
+  prev_cksum = queue_cur->exec_cksum;
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+    stage_cur_byte = stage_cur >> 3;
+
+    FLIP_BIT(out_buf, stage_cur);
+
+    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+    FLIP_BIT(out_buf, stage_cur);
+
+    /* While flipping the least significant bit in every byte, pull of an extra
+       trick to detect possible syntax tokens. In essence, the idea is that if
+       you have a binary blob like this:
+
+       xxxxxxxxIHDRxxxxxxxx
+
+       ...and changing the leading and trailing bytes causes variable or no
+       changes in program flow, but touching any character in the "IHDR" string
+       always produces the same, distinctive path, it's highly likely that
+       "IHDR" is an atomically-checked magic value of special significance to
+       the fuzzed format.
+
+       We do this here, rather than as a separate stage, because it's a nice
+       way to keep the operation approximately "free" (i.e., no extra execs).
+       
+       Empirically, performing the check when flipping the least significant bit
+       is advantageous, compared to doing it at the time of more disruptive
+       changes, where the program flow may be affected in more violent ways.
+
+       The caveat is that we won't generate dictionaries in the -d mode or -S
+       mode - but that's probably a fair trade-off.
+
+       This won't work particularly well with paths that exhibit variable
+       behavior, but fails gracefully, so we'll carry out the checks anyway.
+
+      */
+
+    if (!dumb_mode && (stage_cur & 7) == 7) {
+
+      u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+      if (stage_cur == stage_max - 1 && cksum == prev_cksum) {
+
+        /* If at end of file and we are still collecting a string, grab the
+           final character and force output. */
+
+        if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
+        ++a_len;
+
+        if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
+          maybe_add_auto(a_collect, a_len);
+
+      } else if (cksum != prev_cksum) {
+
+        /* Otherwise, if the checksum has changed, see if we have something
+           worthwhile queued up, and collect that if the answer is yes. */
+
+        if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
+          maybe_add_auto(a_collect, a_len);
+
+        a_len = 0;
+        prev_cksum = cksum;
+
+      }
+
+      /* Continue collecting string, but only if the bit flip actually made
+         any difference - we don't want no-op tokens. */
+
+      if (cksum != queue_cur->exec_cksum) {
+
+        if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];        
+        ++a_len;
+
+      }
+
+    }
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_FLIP1]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_FLIP1] += stage_max;
+
+  /* Two walking bits. */
+
+  stage_name  = "bitflip 2/1";
+  stage_short = "flip2";
+  stage_max   = (len << 3) - 1;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+    stage_cur_byte = stage_cur >> 3;
+
+    FLIP_BIT(out_buf, stage_cur);
+    FLIP_BIT(out_buf, stage_cur + 1);
+
+    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+    FLIP_BIT(out_buf, stage_cur);
+    FLIP_BIT(out_buf, stage_cur + 1);
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_FLIP2]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_FLIP2] += stage_max;
+
+  /* Four walking bits. */
+
+  stage_name  = "bitflip 4/1";
+  stage_short = "flip4";
+  stage_max   = (len << 3) - 3;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+    stage_cur_byte = stage_cur >> 3;
+
+    FLIP_BIT(out_buf, stage_cur);
+    FLIP_BIT(out_buf, stage_cur + 1);
+    FLIP_BIT(out_buf, stage_cur + 2);
+    FLIP_BIT(out_buf, stage_cur + 3);
+
+    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+    FLIP_BIT(out_buf, stage_cur);
+    FLIP_BIT(out_buf, stage_cur + 1);
+    FLIP_BIT(out_buf, stage_cur + 2);
+    FLIP_BIT(out_buf, stage_cur + 3);
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_FLIP4]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_FLIP4] += stage_max;
+
+  /* Effector map setup. These macros calculate:
+
+     EFF_APOS      - position of a particular file offset in the map.
+     EFF_ALEN      - length of a map with a particular number of bytes.
+     EFF_SPAN_ALEN - map span for a sequence of bytes.
+
+   */
+
+#define EFF_APOS(_p)          ((_p) >> EFF_MAP_SCALE2)
+#define EFF_REM(_x)           ((_x) & ((1 << EFF_MAP_SCALE2) - 1))
+#define EFF_ALEN(_l)          (EFF_APOS(_l) + !!EFF_REM(_l))
+#define EFF_SPAN_ALEN(_p, _l) (EFF_APOS((_p) + (_l) - 1) - EFF_APOS(_p) + 1)
+
+  /* Initialize effector map for the next step (see comments below). Always
+     flag first and last byte as doing something. */
+
+  eff_map    = ck_alloc(EFF_ALEN(len));
+  eff_map[0] = 1;
+
+  if (EFF_APOS(len - 1) != 0) {
+    eff_map[EFF_APOS(len - 1)] = 1;
+    ++eff_cnt;
+  }
+
+  /* Walking byte. */
+
+  stage_name  = "bitflip 8/8";
+  stage_short = "flip8";
+  stage_max   = len;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+    stage_cur_byte = stage_cur;
+
+    out_buf[stage_cur] ^= 0xFF;
+
+    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+    /* We also use this stage to pull off a simple trick: we identify
+       bytes that seem to have no effect on the current execution path
+       even when fully flipped - and we skip them during more expensive
+       deterministic stages, such as arithmetics or known ints. */
+
+    if (!eff_map[EFF_APOS(stage_cur)]) {
+
+      u32 cksum;
+
+      /* If in dumb mode or if the file is very short, just flag everything
+         without wasting time on checksums. */
+
+      if (!dumb_mode && len >= EFF_MIN_LEN)
+        cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+      else
+        cksum = ~queue_cur->exec_cksum;
+
+      if (cksum != queue_cur->exec_cksum) {
+        eff_map[EFF_APOS(stage_cur)] = 1;
+        ++eff_cnt;
+      }
+
+    }
+
+    out_buf[stage_cur] ^= 0xFF;
+
+  }
+
+  /* If the effector map is more than EFF_MAX_PERC dense, just flag the
+     whole thing as worth fuzzing, since we wouldn't be saving much time
+     anyway. */
+
+  if (eff_cnt != EFF_ALEN(len) &&
+      eff_cnt * 100 / EFF_ALEN(len) > EFF_MAX_PERC) {
+
+    memset(eff_map, 1, EFF_ALEN(len));
+
+    blocks_eff_select += EFF_ALEN(len);
+
+  } else {
+
+    blocks_eff_select += eff_cnt;
+
+  }
+
+  blocks_eff_total += EFF_ALEN(len);
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_FLIP8]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_FLIP8] += stage_max;
+
+  /* Two walking bytes. */
+
+  if (len < 2) goto skip_bitflip;
+
+  stage_name  = "bitflip 16/8";
+  stage_short = "flip16";
+  stage_cur   = 0;
+  stage_max   = len - 1;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len - 1; ++i) {
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+      --stage_max;
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    *(u16*)(out_buf + i) ^= 0xFFFF;
+
+    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+    ++stage_cur;
+
+    *(u16*)(out_buf + i) ^= 0xFFFF;
+
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_FLIP16]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_FLIP16] += stage_max;
+
+  if (len < 4) goto skip_bitflip;
+
+  /* Four walking bytes. */
+
+  stage_name  = "bitflip 32/8";
+  stage_short = "flip32";
+  stage_cur   = 0;
+  stage_max   = len - 3;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len - 3; ++i) {
+
+    /* Let's consult the effector map... */
+    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+        !eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+      --stage_max;
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    *(u32*)(out_buf + i) ^= 0xFFFFFFFF;
+
+    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+    ++stage_cur;
+
+    *(u32*)(out_buf + i) ^= 0xFFFFFFFF;
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_FLIP32]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_FLIP32] += stage_max;
+
+skip_bitflip:
+
+  if (no_arith) goto skip_arith;
+
+  /**********************
+   * ARITHMETIC INC/DEC *
+   **********************/
+
+  /* 8-bit arithmetics. */
+
+  stage_name  = "arith 8/8";
+  stage_short = "arith8";
+  stage_cur   = 0;
+  stage_max   = 2 * len * ARITH_MAX;
+
+  stage_val_type = STAGE_VAL_LE;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len; ++i) {
+
+    u8 orig = out_buf[i];
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)]) {
+      stage_max -= 2 * ARITH_MAX;
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    for (j = 1; j <= ARITH_MAX; ++j) {
+
+      u8 r = orig ^ (orig + j);
+
+      /* Do arithmetic operations only if the result couldn't be a product
+         of a bitflip. */
+
+      if (!could_be_bitflip(r)) {
+
+        stage_cur_val = j;
+        out_buf[i] = orig + j;
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      r =  orig ^ (orig - j);
+
+      if (!could_be_bitflip(r)) {
+
+        stage_cur_val = -j;
+        out_buf[i] = orig - j;
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      out_buf[i] = orig;
+
+    }
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_ARITH8]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_ARITH8] += stage_max;
+
+  /* 16-bit arithmetics, both endians. */
+
+  if (len < 2) goto skip_arith;
+
+  stage_name  = "arith 16/8";
+  stage_short = "arith16";
+  stage_cur   = 0;
+  stage_max   = 4 * (len - 1) * ARITH_MAX;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len - 1; ++i) {
+
+    u16 orig = *(u16*)(out_buf + i);
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+      stage_max -= 4 * ARITH_MAX;
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    for (j = 1; j <= ARITH_MAX; ++j) {
+
+      u16 r1 = orig ^ (orig + j),
+          r2 = orig ^ (orig - j),
+          r3 = orig ^ SWAP16(SWAP16(orig) + j),
+          r4 = orig ^ SWAP16(SWAP16(orig) - j);
+
+      /* Try little endian addition and subtraction first. Do it only
+         if the operation would affect more than one byte (hence the 
+         & 0xff overflow checks) and if it couldn't be a product of
+         a bitflip. */
+
+      stage_val_type = STAGE_VAL_LE; 
+
+      if ((orig & 0xff) + j > 0xff && !could_be_bitflip(r1)) {
+
+        stage_cur_val = j;
+        *(u16*)(out_buf + i) = orig + j;
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+ 
+      } else --stage_max;
+
+      if ((orig & 0xff) < j && !could_be_bitflip(r2)) {
+
+        stage_cur_val = -j;
+        *(u16*)(out_buf + i) = orig - j;
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      /* Big endian comes next. Same deal. */
+
+      stage_val_type = STAGE_VAL_BE;
+
+
+      if ((orig >> 8) + j > 0xff && !could_be_bitflip(r3)) {
+
+        stage_cur_val = j;
+        *(u16*)(out_buf + i) = SWAP16(SWAP16(orig) + j);
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      if ((orig >> 8) < j && !could_be_bitflip(r4)) {
+
+        stage_cur_val = -j;
+        *(u16*)(out_buf + i) = SWAP16(SWAP16(orig) - j);
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      *(u16*)(out_buf + i) = orig;
+
+    }
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_ARITH16]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_ARITH16] += stage_max;
+
+  /* 32-bit arithmetics, both endians. */
+
+  if (len < 4) goto skip_arith;
+
+  stage_name  = "arith 32/8";
+  stage_short = "arith32";
+  stage_cur   = 0;
+  stage_max   = 4 * (len - 3) * ARITH_MAX;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len - 3; ++i) {
+
+    u32 orig = *(u32*)(out_buf + i);
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+        !eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+      stage_max -= 4 * ARITH_MAX;
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    for (j = 1; j <= ARITH_MAX; ++j) {
+
+      u32 r1 = orig ^ (orig + j),
+          r2 = orig ^ (orig - j),
+          r3 = orig ^ SWAP32(SWAP32(orig) + j),
+          r4 = orig ^ SWAP32(SWAP32(orig) - j);
+
+      /* Little endian first. Same deal as with 16-bit: we only want to
+         try if the operation would have effect on more than two bytes. */
+
+      stage_val_type = STAGE_VAL_LE;
+
+      if ((orig & 0xffff) + j > 0xffff && !could_be_bitflip(r1)) {
+
+        stage_cur_val = j;
+        *(u32*)(out_buf + i) = orig + j;
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      if ((orig & 0xffff) < j && !could_be_bitflip(r2)) {
+
+        stage_cur_val = -j;
+        *(u32*)(out_buf + i) = orig - j;
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      /* Big endian next. */
+
+      stage_val_type = STAGE_VAL_BE;
+
+      if ((SWAP32(orig) & 0xffff) + j > 0xffff && !could_be_bitflip(r3)) {
+
+        stage_cur_val = j;
+        *(u32*)(out_buf + i) = SWAP32(SWAP32(orig) + j);
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      if ((SWAP32(orig) & 0xffff) < j && !could_be_bitflip(r4)) {
+
+        stage_cur_val = -j;
+        *(u32*)(out_buf + i) = SWAP32(SWAP32(orig) - j);
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      *(u32*)(out_buf + i) = orig;
+
+    }
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_ARITH32]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_ARITH32] += stage_max;
+
+skip_arith:
+
+  /**********************
+   * INTERESTING VALUES *
+   **********************/
+
+  stage_name  = "interest 8/8";
+  stage_short = "int8";
+  stage_cur   = 0;
+  stage_max   = len * sizeof(interesting_8);
+
+  stage_val_type = STAGE_VAL_LE;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  /* Setting 8-bit integers. */
+
+  for (i = 0; i < len; ++i) {
+
+    u8 orig = out_buf[i];
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)]) {
+      stage_max -= sizeof(interesting_8);
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    for (j = 0; j < sizeof(interesting_8); ++j) {
+
+      /* Skip if the value could be a product of bitflips or arithmetics. */
+
+      if (could_be_bitflip(orig ^ (u8)interesting_8[j]) ||
+          could_be_arith(orig, (u8)interesting_8[j], 1)) {
+        --stage_max;
+        continue;
+      }
+
+      stage_cur_val = interesting_8[j];
+      out_buf[i] = interesting_8[j];
+
+      if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+      out_buf[i] = orig;
+      ++stage_cur;
+
+    }
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_INTEREST8]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_INTEREST8] += stage_max;
+
+  /* Setting 16-bit integers, both endians. */
+
+  if (no_arith || len < 2) goto skip_interest;
+
+  stage_name  = "interest 16/8";
+  stage_short = "int16";
+  stage_cur   = 0;
+  stage_max   = 2 * (len - 1) * (sizeof(interesting_16) >> 1);
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len - 1; ++i) {
+
+    u16 orig = *(u16*)(out_buf + i);
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+      stage_max -= sizeof(interesting_16);
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
+
+      stage_cur_val = interesting_16[j];
+
+      /* Skip if this could be a product of a bitflip, arithmetics,
+         or single-byte interesting value insertion. */
+
+      if (!could_be_bitflip(orig ^ (u16)interesting_16[j]) &&
+          !could_be_arith(orig, (u16)interesting_16[j], 2) &&
+          !could_be_interest(orig, (u16)interesting_16[j], 2, 0)) {
+
+        stage_val_type = STAGE_VAL_LE;
+
+        *(u16*)(out_buf + i) = interesting_16[j];
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      if ((u16)interesting_16[j] != SWAP16(interesting_16[j]) &&
+          !could_be_bitflip(orig ^ SWAP16(interesting_16[j])) &&
+          !could_be_arith(orig, SWAP16(interesting_16[j]), 2) &&
+          !could_be_interest(orig, SWAP16(interesting_16[j]), 2, 1)) {
+
+        stage_val_type = STAGE_VAL_BE;
+
+        *(u16*)(out_buf + i) = SWAP16(interesting_16[j]);
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+    }
+
+    *(u16*)(out_buf + i) = orig;
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_INTEREST16]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_INTEREST16] += stage_max;
+
+  if (len < 4) goto skip_interest;
+
+  /* Setting 32-bit integers, both endians. */
+
+  stage_name  = "interest 32/8";
+  stage_short = "int32";
+  stage_cur   = 0;
+  stage_max   = 2 * (len - 3) * (sizeof(interesting_32) >> 2);
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len - 3; i++) {
+
+    u32 orig = *(u32*)(out_buf + i);
+
+    /* Let's consult the effector map... */
+
+    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+        !eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+      stage_max -= sizeof(interesting_32) >> 1;
+      continue;
+    }
+
+    stage_cur_byte = i;
+
+    for (j = 0; j < sizeof(interesting_32) / 4; ++j) {
+
+      stage_cur_val = interesting_32[j];
+
+      /* Skip if this could be a product of a bitflip, arithmetics,
+         or word interesting value insertion. */
+
+      if (!could_be_bitflip(orig ^ (u32)interesting_32[j]) &&
+          !could_be_arith(orig, interesting_32[j], 4) &&
+          !could_be_interest(orig, interesting_32[j], 4, 0)) {
+
+        stage_val_type = STAGE_VAL_LE;
+
+        *(u32*)(out_buf + i) = interesting_32[j];
+
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+      if ((u32)interesting_32[j] != SWAP32(interesting_32[j]) &&
+          !could_be_bitflip(orig ^ SWAP32(interesting_32[j])) &&
+          !could_be_arith(orig, SWAP32(interesting_32[j]), 4) &&
+          !could_be_interest(orig, SWAP32(interesting_32[j]), 4, 1)) {
+
+        stage_val_type = STAGE_VAL_BE;
+
+        *(u32*)(out_buf + i) = SWAP32(interesting_32[j]);
+        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+        ++stage_cur;
+
+      } else --stage_max;
+
+    }
+
+    *(u32*)(out_buf + i) = orig;
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_INTEREST32]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_INTEREST32] += stage_max;
+
+skip_interest:
+
+  /********************
+   * DICTIONARY STUFF *
+   ********************/
+
+  if (!extras_cnt) goto skip_user_extras;
+
+  /* Overwrite with user-supplied extras. */
+
+  stage_name  = "user extras (over)";
+  stage_short = "ext_UO";
+  stage_cur   = 0;
+  stage_max   = extras_cnt * len;
+
+  stage_val_type = STAGE_VAL_NONE;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len; ++i) {
+
+    u32 last_len = 0;
+
+    stage_cur_byte = i;
+
+    /* Extras are sorted by size, from smallest to largest. This means
+       that we don't have to worry about restoring the buffer in
+       between writes at a particular offset determined by the outer
+       loop. */
+
+    for (j = 0; j < extras_cnt; ++j) {
+
+      /* Skip extras probabilistically if extras_cnt > MAX_DET_EXTRAS. Also
+         skip them if there's no room to insert the payload, if the token
+         is redundant, or if its entire span has no bytes set in the effector
+         map. */
+
+      if ((extras_cnt > MAX_DET_EXTRAS && UR(extras_cnt) >= MAX_DET_EXTRAS) ||
+          extras[j].len > len - i ||
+          !memcmp(extras[j].data, out_buf + i, extras[j].len) ||
+          !memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, extras[j].len))) {
+
+        --stage_max;
+        continue;
+
+      }
+
+      last_len = extras[j].len;
+      memcpy(out_buf + i, extras[j].data, last_len);
+
+      if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+      ++stage_cur;
+
+    }
+
+    /* Restore all the clobbered memory. */
+    memcpy(out_buf + i, in_buf + i, last_len);
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_EXTRAS_UO]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_EXTRAS_UO] += stage_max;
+
+  /* Insertion of user-supplied extras. */
+
+  stage_name  = "user extras (insert)";
+  stage_short = "ext_UI";
+  stage_cur   = 0;
+  stage_max   = extras_cnt * len;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  ex_tmp = ck_alloc(len + MAX_DICT_FILE);
+
+  for (i = 0; i <= len; ++i) {
+
+    stage_cur_byte = i;
+
+    for (j = 0; j < extras_cnt; ++j) {
+
+      if (len + extras[j].len > MAX_FILE) {
+        --stage_max; 
+        continue;
+      }
+
+      /* Insert token */
+      memcpy(ex_tmp + i, extras[j].data, extras[j].len);
+
+      /* Copy tail */
+      memcpy(ex_tmp + i + extras[j].len, out_buf + i, len - i);
+
+      if (common_fuzz_stuff(argv, ex_tmp, len + extras[j].len)) {
+        ck_free(ex_tmp);
+        goto abandon_entry;
+      }
+
+      ++stage_cur;
+
+    }
+
+    /* Copy head */
+    ex_tmp[i] = out_buf[i];
+
+  }
+
+  ck_free(ex_tmp);
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_EXTRAS_UI]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_EXTRAS_UI] += stage_max;
+
+skip_user_extras:
+
+  if (!a_extras_cnt) goto skip_extras;
+
+  stage_name  = "auto extras (over)";
+  stage_short = "ext_AO";
+  stage_cur   = 0;
+  stage_max   = MIN(a_extras_cnt, USE_AUTO_EXTRAS) * len;
+
+  stage_val_type = STAGE_VAL_NONE;
+
+  orig_hit_cnt = new_hit_cnt;
+
+  for (i = 0; i < len; ++i) {
+
+    u32 last_len = 0;
+
+    stage_cur_byte = i;
+
+    for (j = 0; j < MIN(a_extras_cnt, USE_AUTO_EXTRAS); ++j) {
+
+      /* See the comment in the earlier code; extras are sorted by size. */
+
+      if (a_extras[j].len > len - i ||
+          !memcmp(a_extras[j].data, out_buf + i, a_extras[j].len) ||
+          !memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, a_extras[j].len))) {
+
+        --stage_max;
+        continue;
+
+      }
+
+      last_len = a_extras[j].len;
+      memcpy(out_buf + i, a_extras[j].data, last_len);
+
+      if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+      ++stage_cur;
+
+    }
+
+    /* Restore all the clobbered memory. */
+    memcpy(out_buf + i, in_buf + i, last_len);
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_EXTRAS_AO]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_EXTRAS_AO] += stage_max;
+
+skip_extras:
+
+  /* If we made this to here without jumping to havoc_stage or abandon_entry,
+     we're properly done with deterministic steps and can mark it as such
+     in the .state/ directory. */
+
+  if (!queue_cur->passed_det) mark_as_det_done(queue_cur);
+
+#ifdef USE_PYTHON
+python_stage:
+  /**********************************
+   * EXTERNAL MUTATORS (Python API) *
+   **********************************/
+
+  if (!py_module) goto havoc_stage;
+
+  stage_name  = "python";
+  stage_short = "python";
+  stage_max   = HAVOC_CYCLES * perf_score / havoc_div / 100;
+
+  if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
+
+  orig_hit_cnt = queued_paths + unique_crashes;
+
+  char* retbuf = NULL;
+  size_t retlen = 0;
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+    struct queue_entry* target;
+    u32 tid;
+    u8* new_buf;
+
+retry_external_pick:
+    /* Pick a random other queue entry for passing to external API */
+    do { tid = UR(queued_paths); } while (tid == current_entry && queued_paths > 1);
+
+    target = queue;
+
+    while (tid >= 100) { target = target->next_100; tid -= 100; }
+    while (tid--) target = target->next;
+
+    /* Make sure that the target has a reasonable length. */
+
+    while (target && (target->len < 2 || target == queue_cur) && queued_paths > 1) {
+      target = target->next;
+      ++splicing_with;
+    }
+
+    if (!target) goto retry_external_pick;
+
+    /* Read the additional testcase into a new buffer. */
+    fd = open(target->fname, O_RDONLY);
+    if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
+    new_buf = ck_alloc_nozero(target->len);
+    ck_read(fd, new_buf, target->len, target->fname);
+    close(fd);
+
+    fuzz_py(out_buf, len, new_buf, target->len, &retbuf, &retlen);
+
+    ck_free(new_buf);
+
+    if (retbuf) {
+      if (!retlen)
+        goto abandon_entry;
+
+      if (common_fuzz_stuff(argv, retbuf, retlen)) {
+        free(retbuf);
+        goto abandon_entry;
+      }
+
+      /* Reset retbuf/retlen */
+      free(retbuf);
+      retbuf = NULL;
+      retlen = 0;
+
+      /* If we're finding new stuff, let's run for a bit longer, limits
+         permitting. */
+
+      if (queued_paths != havoc_queued) {
+        if (perf_score <= havoc_max_mult * 100) {
+          stage_max  *= 2;
+          perf_score *= 2;
+        }
+
+        havoc_queued = queued_paths;
+      }
+    }
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  stage_finds[STAGE_PYTHON]  += new_hit_cnt - orig_hit_cnt;
+  stage_cycles[STAGE_PYTHON] += stage_max;
+
+  if (python_only) {
+    /* Skip other stages */
+    ret_val = 0;
+    goto abandon_entry;
+  }
+#endif
+
+  /****************
+   * RANDOM HAVOC *
+   ****************/
+
+havoc_stage:
+
+  stage_cur_byte = -1;
+
+  /* The havoc stage mutation code is also invoked when splicing files; if the
+     splice_cycle variable is set, generate different descriptions and such. */
+
+  if (!splice_cycle) {
+
+    stage_name  = "havoc";
+    stage_short = "havoc";
+    stage_max   = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
+                  perf_score / havoc_div / 100;
+
+  } else {
+
+    static u8 tmp[32];
+
+    perf_score = orig_perf;
+
+    sprintf(tmp, "splice %u", splice_cycle);
+    stage_name  = tmp;
+    stage_short = "splice";
+    stage_max   = SPLICE_HAVOC * perf_score / havoc_div / 100;
+
+  }
+
+  if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
+
+  temp_len = len;
+
+  orig_hit_cnt = queued_paths + unique_crashes;
+
+  havoc_queued = queued_paths;
+
+  /* We essentially just do several thousand runs (depending on perf_score)
+     where we take the input file and make random stacked tweaks. */
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+    u32 use_stacking = 1 << (1 + UR(HAVOC_STACK_POW2));
+
+    stage_cur_val = use_stacking;
+ 
+    for (i = 0; i < use_stacking; ++i) {
+
+      switch (UR(15 + ((extras_cnt + a_extras_cnt) ? 2 : 0))) {
+
+        case 0:
+
+          /* Flip a single bit somewhere. Spooky! */
+
+          FLIP_BIT(out_buf, UR(temp_len << 3));
+          break;
+
+        case 1: 
+
+          /* Set byte to interesting value. */
+
+          out_buf[UR(temp_len)] = interesting_8[UR(sizeof(interesting_8))];
+          break;
+
+        case 2:
+
+          /* Set word to interesting value, randomly choosing endian. */
+
+          if (temp_len < 2) break;
+
+          if (UR(2)) {
+
+            *(u16*)(out_buf + UR(temp_len - 1)) =
+              interesting_16[UR(sizeof(interesting_16) >> 1)];
+
+          } else {
+
+            *(u16*)(out_buf + UR(temp_len - 1)) = SWAP16(
+              interesting_16[UR(sizeof(interesting_16) >> 1)]);
+
+          }
+
+          break;
+
+        case 3:
+
+          /* Set dword to interesting value, randomly choosing endian. */
+
+          if (temp_len < 4) break;
+
+          if (UR(2)) {
+  
+            *(u32*)(out_buf + UR(temp_len - 3)) =
+              interesting_32[UR(sizeof(interesting_32) >> 2)];
+
+          } else {
+
+            *(u32*)(out_buf + UR(temp_len - 3)) = SWAP32(
+              interesting_32[UR(sizeof(interesting_32) >> 2)]);
+
+          }
+
+          break;
+
+        case 4:
+
+          /* Randomly subtract from byte. */
+
+          out_buf[UR(temp_len)] -= 1 + UR(ARITH_MAX);
+          break;
+
+        case 5:
+
+          /* Randomly add to byte. */
+
+          out_buf[UR(temp_len)] += 1 + UR(ARITH_MAX);
+          break;
+
+        case 6:
+
+          /* Randomly subtract from word, random endian. */
+
+          if (temp_len < 2) break;
+
+          if (UR(2)) {
+
+            u32 pos = UR(temp_len - 1);
+
+            *(u16*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
+
+          } else {
+
+            u32 pos = UR(temp_len - 1);
+            u16 num = 1 + UR(ARITH_MAX);
+
+            *(u16*)(out_buf + pos) =
+              SWAP16(SWAP16(*(u16*)(out_buf + pos)) - num);
+
+          }
+
+          break;
+
+        case 7:
+
+          /* Randomly add to word, random endian. */
+
+          if (temp_len < 2) break;
+
+          if (UR(2)) {
+
+            u32 pos = UR(temp_len - 1);
+
+            *(u16*)(out_buf + pos) += 1 + UR(ARITH_MAX);
+
+          } else {
+
+            u32 pos = UR(temp_len - 1);
+            u16 num = 1 + UR(ARITH_MAX);
+
+            *(u16*)(out_buf + pos) =
+              SWAP16(SWAP16(*(u16*)(out_buf + pos)) + num);
+
+          }
+
+          break;
+
+        case 8:
+
+          /* Randomly subtract from dword, random endian. */
+
+          if (temp_len < 4) break;
+
+          if (UR(2)) {
+
+            u32 pos = UR(temp_len - 3);
+
+            *(u32*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
+
+          } else {
+
+            u32 pos = UR(temp_len - 3);
+            u32 num = 1 + UR(ARITH_MAX);
+
+            *(u32*)(out_buf + pos) =
+              SWAP32(SWAP32(*(u32*)(out_buf + pos)) - num);
+
+          }
+
+          break;
+
+        case 9:
+
+          /* Randomly add to dword, random endian. */
+
+          if (temp_len < 4) break;
+
+          if (UR(2)) {
+
+            u32 pos = UR(temp_len - 3);
+
+            *(u32*)(out_buf + pos) += 1 + UR(ARITH_MAX);
+
+          } else {
+
+            u32 pos = UR(temp_len - 3);
+            u32 num = 1 + UR(ARITH_MAX);
+
+            *(u32*)(out_buf + pos) =
+              SWAP32(SWAP32(*(u32*)(out_buf + pos)) + num);
+
+          }
+
+          break;
+
+        case 10:
+
+          /* Just set a random byte to a random value. Because,
+             why not. We use XOR with 1-255 to eliminate the
+             possibility of a no-op. */
+
+          out_buf[UR(temp_len)] ^= 1 + UR(255);
+          break;
+
+        case 11 ... 12: {
+
+            /* Delete bytes. We're making this a bit more likely
+               than insertion (the next option) in hopes of keeping
+               files reasonably small. */
+
+            u32 del_from, del_len;
+
+            if (temp_len < 2) break;
+
+            /* Don't delete too much. */
+
+            del_len = choose_block_len(temp_len - 1);
+
+            del_from = UR(temp_len - del_len + 1);
+
+            memmove(out_buf + del_from, out_buf + del_from + del_len,
+                    temp_len - del_from - del_len);
+
+            temp_len -= del_len;
+
+            break;
+
+          }
+
+        case 13:
+
+          if (temp_len + HAVOC_BLK_XL < MAX_FILE) {
+
+            /* Clone bytes (75%) or insert a block of constant bytes (25%). */
+
+            u8  actually_clone = UR(4);
+            u32 clone_from, clone_to, clone_len;
+            u8* new_buf;
+
+            if (actually_clone) {
+
+              clone_len  = choose_block_len(temp_len);
+              clone_from = UR(temp_len - clone_len + 1);
+
+            } else {
+
+              clone_len = choose_block_len(HAVOC_BLK_XL);
+              clone_from = 0;
+
+            }
+
+            clone_to   = UR(temp_len);
+
+            new_buf = ck_alloc_nozero(temp_len + clone_len);
+
+            /* Head */
+
+            memcpy(new_buf, out_buf, clone_to);
+
+            /* Inserted part */
+
+            if (actually_clone)
+              memcpy(new_buf + clone_to, out_buf + clone_from, clone_len);
+            else
+              memset(new_buf + clone_to,
+                     UR(2) ? UR(256) : out_buf[UR(temp_len)], clone_len);
+
+            /* Tail */
+            memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
+                   temp_len - clone_to);
+
+            ck_free(out_buf);
+            out_buf = new_buf;
+            temp_len += clone_len;
+
+          }
+
+          break;
+
+        case 14: {
+
+            /* Overwrite bytes with a randomly selected chunk (75%) or fixed
+               bytes (25%). */
+
+            u32 copy_from, copy_to, copy_len;
+
+            if (temp_len < 2) break;
+
+            copy_len  = choose_block_len(temp_len - 1);
+
+            copy_from = UR(temp_len - copy_len + 1);
+            copy_to   = UR(temp_len - copy_len + 1);
+
+            if (UR(4)) {
+
+              if (copy_from != copy_to)
+                memmove(out_buf + copy_to, out_buf + copy_from, copy_len);
+
+            } else memset(out_buf + copy_to,
+                          UR(2) ? UR(256) : out_buf[UR(temp_len)], copy_len);
+
+            break;
+
+          }
+
+        /* Values 15 and 16 can be selected only if there are any extras
+           present in the dictionaries. */
+
+        case 15: {
+
+            /* Overwrite bytes with an extra. */
+
+            if (!extras_cnt || (a_extras_cnt && UR(2))) {
+
+              /* No user-specified extras or odds in our favor. Let's use an
+                 auto-detected one. */
+
+              u32 use_extra = UR(a_extras_cnt);
+              u32 extra_len = a_extras[use_extra].len;
+              u32 insert_at;
+
+              if (extra_len > temp_len) break;
+
+              insert_at = UR(temp_len - extra_len + 1);
+              memcpy(out_buf + insert_at, a_extras[use_extra].data, extra_len);
+
+            } else {
+
+              /* No auto extras or odds in our favor. Use the dictionary. */
+
+              u32 use_extra = UR(extras_cnt);
+              u32 extra_len = extras[use_extra].len;
+              u32 insert_at;
+
+              if (extra_len > temp_len) break;
+
+              insert_at = UR(temp_len - extra_len + 1);
+              memcpy(out_buf + insert_at, extras[use_extra].data, extra_len);
+
+            }
+
+            break;
+
+          }
+
+        case 16: {
+
+            u32 use_extra, extra_len, insert_at = UR(temp_len + 1);
+            u8* new_buf;
+
+            /* Insert an extra. Do the same dice-rolling stuff as for the
+               previous case. */
+
+            if (!extras_cnt || (a_extras_cnt && UR(2))) {
+
+              use_extra = UR(a_extras_cnt);
+              extra_len = a_extras[use_extra].len;
+
+              if (temp_len + extra_len >= MAX_FILE) break;
+
+              new_buf = ck_alloc_nozero(temp_len + extra_len);
+
+              /* Head */
+              memcpy(new_buf, out_buf, insert_at);
+
+              /* Inserted part */
+              memcpy(new_buf + insert_at, a_extras[use_extra].data, extra_len);
+
+	    } else {
+
+              use_extra = UR(extras_cnt);
+              extra_len = extras[use_extra].len;
+
+              if (temp_len + extra_len >= MAX_FILE) break;
+
+              new_buf = ck_alloc_nozero(temp_len + extra_len);
+
+              /* Head */
+              memcpy(new_buf, out_buf, insert_at);
+
+              /* Inserted part */
+              memcpy(new_buf + insert_at, extras[use_extra].data, extra_len);
+
+            }
+
+            /* Tail */
+            memcpy(new_buf + insert_at + extra_len, out_buf + insert_at,
+                   temp_len - insert_at);
+
+            ck_free(out_buf);
+            out_buf   = new_buf;
+            temp_len += extra_len;
+
+            break;
+
+          }
+
+      }
+
+    }
+
+    if (common_fuzz_stuff(argv, out_buf, temp_len))
+      goto abandon_entry;
+
+    /* out_buf might have been mangled a bit, so let's restore it to its
+       original size and shape. */
+
+    if (temp_len < len) out_buf = ck_realloc(out_buf, len);
+    temp_len = len;
+    memcpy(out_buf, in_buf, len);
+
+    /* If we're finding new stuff, let's run for a bit longer, limits
+       permitting. */
+
+    if (queued_paths != havoc_queued) {
+
+      if (perf_score <= havoc_max_mult * 100) {
+        stage_max  *= 2;
+        perf_score *= 2;
+      }
+
+      havoc_queued = queued_paths;
+
+    }
+
+  }
+
+  new_hit_cnt = queued_paths + unique_crashes;
+
+  if (!splice_cycle) {
+    stage_finds[STAGE_HAVOC]  += new_hit_cnt - orig_hit_cnt;
+    stage_cycles[STAGE_HAVOC] += stage_max;
+  } else {
+    stage_finds[STAGE_SPLICE]  += new_hit_cnt - orig_hit_cnt;
+    stage_cycles[STAGE_SPLICE] += stage_max;
+  }
+
+#ifndef IGNORE_FINDS
+
+  /************
+   * SPLICING *
+   ************/
+
+  /* This is a last-resort strategy triggered by a full round with no findings.
+     It takes the current input file, randomly selects another input, and
+     splices them together at some offset, then relies on the havoc
+     code to mutate that blob. */
+
+retry_splicing:
+
+  if (use_splicing && splice_cycle++ < SPLICE_CYCLES &&
+      queued_paths > 1 && queue_cur->len > 1) {
+
+    struct queue_entry* target;
+    u32 tid, split_at;
+    u8* new_buf;
+    s32 f_diff, l_diff;
+
+    /* First of all, if we've modified in_buf for havoc, let's clean that
+       up... */
+
+    if (in_buf != orig_in) {
+      ck_free(in_buf);
+      in_buf = orig_in;
+      len = queue_cur->len;
+    }
+
+    /* Pick a random queue entry and seek to it. Don't splice with yourself. */
+
+    do { tid = UR(queued_paths); } while (tid == current_entry);
+
+    splicing_with = tid;
+    target = queue;
+
+    while (tid >= 100) { target = target->next_100; tid -= 100; }
+    while (tid--) target = target->next;
+
+    /* Make sure that the target has a reasonable length. */
+
+    while (target && (target->len < 2 || target == queue_cur)) {
+      target = target->next;
+      ++splicing_with;
+    }
+
+    if (!target) goto retry_splicing;
+
+    /* Read the testcase into a new buffer. */
+
+    fd = open(target->fname, O_RDONLY);
+
+    if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
+
+    new_buf = ck_alloc_nozero(target->len);
+
+    ck_read(fd, new_buf, target->len, target->fname);
+
+    close(fd);
+
+    /* Find a suitable splicing location, somewhere between the first and
+       the last differing byte. Bail out if the difference is just a single
+       byte or so. */
+
+    locate_diffs(in_buf, new_buf, MIN(len, target->len), &f_diff, &l_diff);
+
+    if (f_diff < 0 || l_diff < 2 || f_diff == l_diff) {
+      ck_free(new_buf);
+      goto retry_splicing;
+    }
+
+    /* Split somewhere between the first and last differing byte. */
+
+    split_at = f_diff + UR(l_diff - f_diff);
+
+    /* Do the thing. */
+
+    len = target->len;
+    memcpy(new_buf, in_buf, split_at);
+    in_buf = new_buf;
+
+    ck_free(out_buf);
+    out_buf = ck_alloc_nozero(len);
+    memcpy(out_buf, in_buf, len);
+
+#ifdef USE_PYTHON
+    goto python_stage;
+#else
+    goto havoc_stage;
+#endif
+
+  }
+
+#endif /* !IGNORE_FINDS */
+
+  ret_val = 0;
+
+abandon_entry:
+
+  splicing_with = -1;
+
+  /* Update pending_not_fuzzed count if we made it through the calibration
+     cycle and have not seen this entry before. */
+
+  if (!stop_soon && !queue_cur->cal_failed && (queue_cur->was_fuzzed == 0 || queue_cur->fuzz_level == 0)) {
+    --pending_not_fuzzed;
+    queue_cur->was_fuzzed = 1;
+    if (queue_cur->favored) --pending_favored;
+  }
+
+  ++queue_cur->fuzz_level;
+
+  munmap(orig_in, queue_cur->len);
+
+  if (in_buf != orig_in) ck_free(in_buf);
+  ck_free(out_buf);
+  ck_free(eff_map);
+
+  return ret_val;
+
+#undef FLIP_BIT
+
+}
+
+/* MOpt mode */
+u8 pilot_fuzzing(char** argv) {
+
+	s32 len, fd, temp_len, i, j;
+	u8  *in_buf, *out_buf, *orig_in, *ex_tmp, *eff_map = 0;
+	u64 havoc_queued, orig_hit_cnt, new_hit_cnt, cur_ms_lv;
+	u32 splice_cycle = 0, perf_score = 100, orig_perf, prev_cksum, eff_cnt = 1;
+
+	u8  ret_val = 1, doing_det = 0;
+
+	u8  a_collect[MAX_AUTO_EXTRA];
+	u32 a_len = 0;
+
+#ifdef IGNORE_FINDS
+
+	/* In IGNORE_FINDS mode, skip any entries that weren't in the
+	   initial data set. */
+
+	if (queue_cur->depth > 1) return 1;
+
+#else
+
+	if (pending_favored) {
+
+		/* If we have any favored, non-fuzzed new arrivals in the queue,
+		   possibly skip to them at the expense of already-fuzzed or non-favored
+		   cases. */
+
+		if ((queue_cur->was_fuzzed || !queue_cur->favored) &&
+			UR(100) < SKIP_TO_NEW_PROB) return 1;
+
+	}
+	else if (!dumb_mode && !queue_cur->favored && queued_paths > 10) {
+
+		/* Otherwise, still possibly skip non-favored cases, albeit less often.
+		   The odds of skipping stuff are higher for already-fuzzed inputs and
+		   lower for never-fuzzed entries. */
+
+		if (queue_cycle > 1 && !queue_cur->was_fuzzed) {
+
+			if (UR(100) < SKIP_NFAV_NEW_PROB) return 1;
+
+		}
+		else {
+
+			if (UR(100) < SKIP_NFAV_OLD_PROB) return 1;
+
+		}
+
+	}
+
+#endif /* ^IGNORE_FINDS */
+
+	if (not_on_tty) {
+		ACTF("Fuzzing test case #%u (%u total, %llu uniq crashes found)...",
+			current_entry, queued_paths, unique_crashes);
+		fflush(stdout);
+	}
+
+	/* Map the test case into memory. */
+
+	fd = open(queue_cur->fname, O_RDONLY);
+
+	if (fd < 0) PFATAL("Unable to open '%s'", queue_cur->fname);
+
+	len = queue_cur->len;
+
+	orig_in = in_buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+	if (orig_in == MAP_FAILED) PFATAL("Unable to mmap '%s'", queue_cur->fname);
+
+	close(fd);
+
+	/* We could mmap() out_buf as MAP_PRIVATE, but we end up clobbering every
+	   single byte anyway, so it wouldn't give us any performance or memory usage
+	   benefits. */
+
+	out_buf = ck_alloc_nozero(len);
+
+	subseq_tmouts = 0;
+
+	cur_depth = queue_cur->depth;
+
+	/*******************************************
+	 * CALIBRATION (only if failed earlier on) *
+	 *******************************************/
+
+	if (queue_cur->cal_failed) {
+
+		u8 res = FAULT_TMOUT;
+
+		if (queue_cur->cal_failed < CAL_CHANCES) {
+
+			res = calibrate_case(argv, queue_cur, in_buf, queue_cycle - 1, 0);
+
+			if (res == FAULT_ERROR)
+				FATAL("Unable to execute target application");
+
+		}
+
+		if (stop_soon || res != crash_mode) {
+			++cur_skipped_paths;
+			goto abandon_entry;
+		}
+
+	}
+
+	/************
+	 * TRIMMING *
+	 ************/
+
+	if (!dumb_mode && !queue_cur->trim_done) {
+
+		u8 res = trim_case(argv, queue_cur, in_buf);
+
+		if (res == FAULT_ERROR)
+			FATAL("Unable to execute target application");
+
+		if (stop_soon) {
+			++cur_skipped_paths;
+			goto abandon_entry;
+		}
+
+		/* Don't retry trimming, even if it failed. */
+
+		queue_cur->trim_done = 1;
+
+		len = queue_cur->len;
+
+	}
+
+	memcpy(out_buf, in_buf, len);
+
+	/*********************
+	 * PERFORMANCE SCORE *
+	 *********************/
+
+	orig_perf = perf_score = calculate_score(queue_cur);
+
+	/* Skip right away if -d is given, if we have done deterministic fuzzing on
+	   this entry ourselves (was_fuzzed), or if it has gone through deterministic
+	   testing in earlier, resumed runs (passed_det). */
+
+	if (skip_deterministic || queue_cur->was_fuzzed || queue_cur->passed_det)
+		goto havoc_stage;
+
+	/* Skip deterministic fuzzing if exec path checksum puts this out of scope
+	   for this master instance. */
+
+	if (master_max && (queue_cur->exec_cksum % master_max) != master_id - 1)
+		goto havoc_stage;
+
+
+	cur_ms_lv = get_cur_time();
+	if (!(key_puppet == 0 && ((cur_ms_lv - last_path_time < limit_time_puppet) ||
+		(last_crash_time != 0 && cur_ms_lv - last_crash_time < limit_time_puppet) || last_path_time == 0)))
+	{
+		key_puppet = 1;
+		goto pacemaker_fuzzing;
+	}
+
+	doing_det = 1;
+
+		/*********************************************
+		 * SIMPLE BITFLIP (+dictionary construction) *
+		 *********************************************/
+
+#define FLIP_BIT(_ar, _b) do { \
+    u8* _arf = (u8*)(_ar); \
+    u32 _bf = (_b); \
+    _arf[(_bf) >> 3] ^= (128 >> ((_bf) & 7)); \
+  } while (0)
+
+		 /* Single walking bit. */
+
+		stage_short = "flip1";
+		stage_max = len << 3;
+		stage_name = "bitflip 1/1";
+
+
+
+
+		stage_val_type = STAGE_VAL_NONE;
+
+		orig_hit_cnt = queued_paths + unique_crashes;
+
+		prev_cksum = queue_cur->exec_cksum;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur >> 3;
+
+			FLIP_BIT(out_buf, stage_cur);
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			FLIP_BIT(out_buf, stage_cur);
+
+			/* While flipping the least significant bit in every byte, pull of an extra
+			   trick to detect possible syntax tokens. In essence, the idea is that if
+			   you have a binary blob like this:
+
+			   xxxxxxxxIHDRxxxxxxxx
+
+			   ...and changing the leading and trailing bytes causes variable or no
+			   changes in program flow, but touching any character in the "IHDR" string
+			   always produces the same, distinctive path, it's highly likely that
+			   "IHDR" is an atomically-checked magic value of special significance to
+			   the fuzzed format.
+
+			   We do this here, rather than as a separate stage, because it's a nice
+			   way to keep the operation approximately "free" (i.e., no extra execs).
+
+			   Empirically, performing the check when flipping the least significant bit
+			   is advantageous, compared to doing it at the time of more disruptive
+			   changes, where the program flow may be affected in more violent ways.
+
+			   The caveat is that we won't generate dictionaries in the -d mode or -S
+			   mode - but that's probably a fair trade-off.
+
+			   This won't work particularly well with paths that exhibit variable
+			   behavior, but fails gracefully, so we'll carry out the checks anyway.
+
+			  */
+
+			if (!dumb_mode && (stage_cur & 7) == 7) {
+
+				u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+				if (stage_cur == stage_max - 1 && cksum == prev_cksum) {
+
+					/* If at end of file and we are still collecting a string, grab the
+					   final character and force output. */
+
+					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
+					++a_len;
+
+					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
+						maybe_add_auto(a_collect, a_len);
+
+				}
+				else if (cksum != prev_cksum) {
+
+					/* Otherwise, if the checksum has changed, see if we have something
+					   worthwhile queued up, and collect that if the answer is yes. */
+
+					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
+						maybe_add_auto(a_collect, a_len);
+
+					a_len = 0;
+					prev_cksum = cksum;
+
+				}
+
+				/* Continue collecting string, but only if the bit flip actually made
+				   any difference - we don't want no-op tokens. */
+
+				if (cksum != queue_cur->exec_cksum) {
+
+					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
+					++a_len;
+
+				}
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP1] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP1] += stage_max;
+
+		/* Two walking bits. */
+
+		stage_name = "bitflip 2/1";
+		stage_short = "flip2";
+		stage_max = (len << 3) - 1;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur >> 3;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP2] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP2] += stage_max;
+
+
+
+		/* Four walking bits. */
+
+		stage_name = "bitflip 4/1";
+		stage_short = "flip4";
+		stage_max = (len << 3) - 3;
+
+
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur >> 3;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+			FLIP_BIT(out_buf, stage_cur + 2);
+			FLIP_BIT(out_buf, stage_cur + 3);
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+			FLIP_BIT(out_buf, stage_cur + 2);
+			FLIP_BIT(out_buf, stage_cur + 3);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP4] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP4] += stage_max;
+
+
+
+
+		/* Effector map setup. These macros calculate:
+
+		   EFF_APOS      - position of a particular file offset in the map.
+		   EFF_ALEN      - length of a map with a particular number of bytes.
+		   EFF_SPAN_ALEN - map span for a sequence of bytes.
+
+		 */
+
+#define EFF_APOS(_p)          ((_p) >> EFF_MAP_SCALE2)
+#define EFF_REM(_x)           ((_x) & ((1 << EFF_MAP_SCALE2) - 1))
+#define EFF_ALEN(_l)          (EFF_APOS(_l) + !!EFF_REM(_l))
+#define EFF_SPAN_ALEN(_p, _l) (EFF_APOS((_p) + (_l) - 1) - EFF_APOS(_p) + 1)
+
+		 /* Initialize effector map for the next step (see comments below). Always
+			flag first and last byte as doing something. */
+
+		eff_map = ck_alloc(EFF_ALEN(len));
+		eff_map[0] = 1;
+
+		if (EFF_APOS(len - 1) != 0) {
+			eff_map[EFF_APOS(len - 1)] = 1;
+			++eff_cnt;
+		}
+
+		/* Walking byte. */
+
+		stage_name = "bitflip 8/8";
+		stage_short = "flip8";
+		stage_max = len;
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur;
+
+			out_buf[stage_cur] ^= 0xFF;
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			/* We also use this stage to pull off a simple trick: we identify
+			   bytes that seem to have no effect on the current execution path
+			   even when fully flipped - and we skip them during more expensive
+			   deterministic stages, such as arithmetics or known ints. */
+
+			if (!eff_map[EFF_APOS(stage_cur)]) {
+
+				u32 cksum;
+
+				/* If in dumb mode or if the file is very short, just flag everything
+				   without wasting time on checksums. */
+
+				if (!dumb_mode && len >= EFF_MIN_LEN)
+					cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+				else
+					cksum = ~queue_cur->exec_cksum;
+
+				if (cksum != queue_cur->exec_cksum) {
+					eff_map[EFF_APOS(stage_cur)] = 1;
+					++eff_cnt;
+				}
+
+			}
+
+			out_buf[stage_cur] ^= 0xFF;
+
+		}
+
+		/* If the effector map is more than EFF_MAX_PERC dense, just flag the
+		   whole thing as worth fuzzing, since we wouldn't be saving much time
+		   anyway. */
+
+		if (eff_cnt != EFF_ALEN(len) &&
+			eff_cnt * 100 / EFF_ALEN(len) > EFF_MAX_PERC) {
+
+			memset(eff_map, 1, EFF_ALEN(len));
+
+			blocks_eff_select += EFF_ALEN(len);
+
+		}
+		else {
+
+			blocks_eff_select += eff_cnt;
+
+		}
+
+		blocks_eff_total += EFF_ALEN(len);
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP8] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP8] += stage_max;
+
+
+
+
+
+		/* Two walking bytes. */
+
+		if (len < 2) goto skip_bitflip;
+
+		stage_name = "bitflip 16/8";
+		stage_short = "flip16";
+		stage_cur = 0;
+		stage_max = len - 1;
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 1; ++i) {
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+				--stage_max;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			*(u16*)(out_buf + i) ^= 0xFFFF;
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+			++stage_cur;
+
+			*(u16*)(out_buf + i) ^= 0xFFFF;
+
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP16] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP16] += stage_max;
+
+
+
+
+		if (len < 4) goto skip_bitflip;
+
+		/* Four walking bytes. */
+
+		stage_name = "bitflip 32/8";
+		stage_short = "flip32";
+		stage_cur = 0;
+		stage_max = len - 3;
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 3; ++i) {
+
+			/* Let's consult the effector map... */
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+				--stage_max;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+			++stage_cur;
+
+			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP32] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP32] += stage_max;
+
+
+
+
+
+
+	skip_bitflip:
+
+		if (no_arith) goto skip_arith;
+
+		/**********************
+		 * ARITHMETIC INC/DEC *
+		 **********************/
+
+		 /* 8-bit arithmetics. */
+
+		stage_name = "arith 8/8";
+		stage_short = "arith8";
+		stage_cur = 0;
+		stage_max = 2 * len * ARITH_MAX;
+
+
+
+
+		stage_val_type = STAGE_VAL_LE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len; ++i) {
+
+			u8 orig = out_buf[i];
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)]) {
+				stage_max -= 2 * ARITH_MAX;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 1; j <= ARITH_MAX; ++j) {
+
+				u8 r = orig ^ (orig + j);
+
+				/* Do arithmetic operations only if the result couldn't be a product
+				   of a bitflip. */
+
+				if (!could_be_bitflip(r)) {
+
+					stage_cur_val = j;
+					out_buf[i] = orig + j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				r = orig ^ (orig - j);
+
+				if (!could_be_bitflip(r)) {
+
+					stage_cur_val = -j;
+					out_buf[i] = orig - j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				out_buf[i] = orig;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_ARITH8] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_ARITH8] += stage_max;
+
+
+
+
+
+		/* 16-bit arithmetics, both endians. */
+
+		if (len < 2) goto skip_arith;
+
+		stage_name = "arith 16/8";
+		stage_short = "arith16";
+		stage_cur = 0;
+		stage_max = 4 * (len - 1) * ARITH_MAX;
+
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 1; ++i) {
+
+			u16 orig = *(u16*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+				stage_max -= 4 * ARITH_MAX;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 1; j <= ARITH_MAX; ++j) {
+
+				u16 r1 = orig ^ (orig + j),
+					r2 = orig ^ (orig - j),
+					r3 = orig ^ SWAP16(SWAP16(orig) + j),
+					r4 = orig ^ SWAP16(SWAP16(orig) - j);
+
+				/* Try little endian addition and subtraction first. Do it only
+				   if the operation would affect more than one byte (hence the
+				   & 0xff overflow checks) and if it couldn't be a product of
+				   a bitflip. */
+
+				stage_val_type = STAGE_VAL_LE;
+
+				if ((orig & 0xff) + j > 0xff && !could_be_bitflip(r1)) {
+
+					stage_cur_val = j;
+					*(u16*)(out_buf + i) = orig + j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((orig & 0xff) < j && !could_be_bitflip(r2)) {
+
+					stage_cur_val = -j;
+					*(u16*)(out_buf + i) = orig - j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				/* Big endian comes next. Same deal. */
+
+				stage_val_type = STAGE_VAL_BE;
+
+
+				if ((orig >> 8) + j > 0xff && !could_be_bitflip(r3)) {
+
+					stage_cur_val = j;
+					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) + j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((orig >> 8) < j && !could_be_bitflip(r4)) {
+
+					stage_cur_val = -j;
+					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) - j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				*(u16*)(out_buf + i) = orig;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_ARITH16] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_ARITH16] += stage_max;
+
+
+
+
+		/* 32-bit arithmetics, both endians. */
+
+		if (len < 4) goto skip_arith;
+
+		stage_name = "arith 32/8";
+		stage_short = "arith32";
+		stage_cur = 0;
+		stage_max = 4 * (len - 3) * ARITH_MAX;
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 3; ++i) {
+
+			u32 orig = *(u32*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+				stage_max -= 4 * ARITH_MAX;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 1; j <= ARITH_MAX; ++j) {
+
+				u32 r1 = orig ^ (orig + j),
+					r2 = orig ^ (orig - j),
+					r3 = orig ^ SWAP32(SWAP32(orig) + j),
+					r4 = orig ^ SWAP32(SWAP32(orig) - j);
+
+				/* Little endian first. Same deal as with 16-bit: we only want to
+				   try if the operation would have effect on more than two bytes. */
+
+				stage_val_type = STAGE_VAL_LE;
+
+				if ((orig & 0xffff) + j > 0xffff && !could_be_bitflip(r1)) {
+
+					stage_cur_val = j;
+					*(u32*)(out_buf + i) = orig + j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((orig & 0xffff) < j && !could_be_bitflip(r2)) {
+
+					stage_cur_val = -j;
+					*(u32*)(out_buf + i) = orig - j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					stage_cur++;
+
+				} else --stage_max;
+
+				/* Big endian next. */
+
+				stage_val_type = STAGE_VAL_BE;
+
+				if ((SWAP32(orig) & 0xffff) + j > 0xffff && !could_be_bitflip(r3)) {
+
+					stage_cur_val = j;
+					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) + j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((SWAP32(orig) & 0xffff) < j && !could_be_bitflip(r4)) {
+
+					stage_cur_val = -j;
+					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) - j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				*(u32*)(out_buf + i) = orig;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_ARITH32] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_ARITH32] += stage_max;
+
+
+
+
+	skip_arith:
+
+		/**********************
+		 * INTERESTING VALUES *
+		 **********************/
+
+		stage_name = "interest 8/8";
+		stage_short = "int8";
+		stage_cur = 0;
+		stage_max = len * sizeof(interesting_8);
+
+
+
+		stage_val_type = STAGE_VAL_LE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		/* Setting 8-bit integers. */
+
+		for (i = 0; i < len; ++i) {
+
+			u8 orig = out_buf[i];
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)]) {
+				stage_max -= sizeof(interesting_8);
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < sizeof(interesting_8); ++j) {
+
+				/* Skip if the value could be a product of bitflips or arithmetics. */
+
+				if (could_be_bitflip(orig ^ (u8)interesting_8[j]) ||
+					could_be_arith(orig, (u8)interesting_8[j], 1)) {
+					--stage_max;
+					continue;
+				}
+
+				stage_cur_val = interesting_8[j];
+				out_buf[i] = interesting_8[j];
+
+				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+				out_buf[i] = orig;
+				++stage_cur;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_INTEREST8] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_INTEREST8] += stage_max;
+
+
+
+
+		/* Setting 16-bit integers, both endians. */
+
+		if (no_arith || len < 2) goto skip_interest;
+
+		stage_name = "interest 16/8";
+		stage_short = "int16";
+		stage_cur = 0;
+		stage_max = 2 * (len - 1) * (sizeof(interesting_16) >> 1);
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 1; ++i) {
+
+			u16 orig = *(u16*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+				stage_max -= sizeof(interesting_16);
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
+
+				stage_cur_val = interesting_16[j];
+
+				/* Skip if this could be a product of a bitflip, arithmetics,
+				   or single-byte interesting value insertion. */
+
+				if (!could_be_bitflip(orig ^ (u16)interesting_16[j]) &&
+					!could_be_arith(orig, (u16)interesting_16[j], 2) &&
+					!could_be_interest(orig, (u16)interesting_16[j], 2, 0)) {
+
+					stage_val_type = STAGE_VAL_LE;
+
+					*(u16*)(out_buf + i) = interesting_16[j];
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((u16)interesting_16[j] != SWAP16(interesting_16[j]) &&
+					!could_be_bitflip(orig ^ SWAP16(interesting_16[j])) &&
+					!could_be_arith(orig, SWAP16(interesting_16[j]), 2) &&
+					!could_be_interest(orig, SWAP16(interesting_16[j]), 2, 1)) {
+
+					stage_val_type = STAGE_VAL_BE;
+
+					*(u16*)(out_buf + i) = SWAP16(interesting_16[j]);
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+			}
+
+			*(u16*)(out_buf + i) = orig;
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_INTEREST16] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_INTEREST16] += stage_max;
+
+
+
+
+
+		if (len < 4) goto skip_interest;
+
+		/* Setting 32-bit integers, both endians. */
+
+		stage_name = "interest 32/8";
+		stage_short = "int32";
+		stage_cur = 0;
+		stage_max = 2 * (len - 3) * (sizeof(interesting_32) >> 2);
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 3; ++i) {
+
+			u32 orig = *(u32*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+				stage_max -= sizeof(interesting_32) >> 1;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < sizeof(interesting_32) / 4; ++j) {
+
+				stage_cur_val = interesting_32[j];
+
+				/* Skip if this could be a product of a bitflip, arithmetics,
+				   or word interesting value insertion. */
+
+				if (!could_be_bitflip(orig ^ (u32)interesting_32[j]) &&
+					!could_be_arith(orig, interesting_32[j], 4) &&
+					!could_be_interest(orig, interesting_32[j], 4, 0)) {
+
+					stage_val_type = STAGE_VAL_LE;
+
+					*(u32*)(out_buf + i) = interesting_32[j];
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((u32)interesting_32[j] != SWAP32(interesting_32[j]) &&
+					!could_be_bitflip(orig ^ SWAP32(interesting_32[j])) &&
+					!could_be_arith(orig, SWAP32(interesting_32[j]), 4) &&
+					!could_be_interest(orig, SWAP32(interesting_32[j]), 4, 1)) {
+
+					stage_val_type = STAGE_VAL_BE;
+
+					*(u32*)(out_buf + i) = SWAP32(interesting_32[j]);
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+			}
+
+			*(u32*)(out_buf + i) = orig;
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_INTEREST32] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_INTEREST32] += stage_max;
+
+
+
+
+
+	skip_interest:
+
+		/********************
+		 * DICTIONARY STUFF *
+		 ********************/
+
+		if (!extras_cnt) goto skip_user_extras;
+
+		/* Overwrite with user-supplied extras. */
+
+		stage_name = "user extras (over)";
+		stage_short = "ext_UO";
+		stage_cur = 0;
+		stage_max = extras_cnt * len;
+
+
+
+
+		stage_val_type = STAGE_VAL_NONE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len; ++i) {
+
+			u32 last_len = 0;
+
+			stage_cur_byte = i;
+
+			/* Extras are sorted by size, from smallest to largest. This means
+			   that we don't have to worry about restoring the buffer in
+			   between writes at a particular offset determined by the outer
+			   loop. */
+
+			for (j = 0; j < extras_cnt; ++j) {
+
+				/* Skip extras probabilistically if extras_cnt > MAX_DET_EXTRAS. Also
+				   skip them if there's no room to insert the payload, if the token
+				   is redundant, or if its entire span has no bytes set in the effector
+				   map. */
+
+				if ((extras_cnt > MAX_DET_EXTRAS && UR(extras_cnt) >= MAX_DET_EXTRAS) ||
+					extras[j].len > len - i ||
+					!memcmp(extras[j].data, out_buf + i, extras[j].len) ||
+					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, extras[j].len))) {
+
+					--stage_max;
+					continue;
+
+				}
+
+				last_len = extras[j].len;
+				memcpy(out_buf + i, extras[j].data, last_len);
+
+				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+				++stage_cur;
+
+			}
+
+			/* Restore all the clobbered memory. */
+			memcpy(out_buf + i, in_buf + i, last_len);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_EXTRAS_UO] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_EXTRAS_UO] += stage_max;
+
+		/* Insertion of user-supplied extras. */
+
+		stage_name = "user extras (insert)";
+		stage_short = "ext_UI";
+		stage_cur = 0;
+		stage_max = extras_cnt * len;
+
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		ex_tmp = ck_alloc(len + MAX_DICT_FILE);
+
+		for (i = 0; i <= len; ++i) {
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < extras_cnt; ++j) {
+
+				if (len + extras[j].len > MAX_FILE) {
+					--stage_max;
+					continue;
+				}
+
+				/* Insert token */
+				memcpy(ex_tmp + i, extras[j].data, extras[j].len);
+
+				/* Copy tail */
+				memcpy(ex_tmp + i + extras[j].len, out_buf + i, len - i);
+
+				if (common_fuzz_stuff(argv, ex_tmp, len + extras[j].len)) {
+					ck_free(ex_tmp);
+					goto abandon_entry;
+				}
+
+				++stage_cur;
+
+			}
+
+			/* Copy head */
+			ex_tmp[i] = out_buf[i];
+
+		}
+
+		ck_free(ex_tmp);
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_EXTRAS_UI] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_EXTRAS_UI] += stage_max;
+
+	skip_user_extras:
+
+		if (!a_extras_cnt) goto skip_extras;
+
+		stage_name = "auto extras (over)";
+		stage_short = "ext_AO";
+		stage_cur = 0;
+		stage_max = MIN(a_extras_cnt, USE_AUTO_EXTRAS) * len;
+
+
+		stage_val_type = STAGE_VAL_NONE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len; ++i) {
+
+			u32 last_len = 0;
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < MIN(a_extras_cnt, USE_AUTO_EXTRAS); ++j) {
+
+				/* See the comment in the earlier code; extras are sorted by size. */
+
+				if (a_extras[j].len > len - i ||
+					!memcmp(a_extras[j].data, out_buf + i, a_extras[j].len) ||
+					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, a_extras[j].len))) {
+
+					--stage_max;
+					continue;
+
+				}
+
+				last_len = a_extras[j].len;
+				memcpy(out_buf + i, a_extras[j].data, last_len);
+
+				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+				++stage_cur;
+
+			}
+
+			/* Restore all the clobbered memory. */
+			memcpy(out_buf + i, in_buf + i, last_len);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_EXTRAS_AO] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_EXTRAS_AO] += stage_max;
+
+	skip_extras:
+
+		/* If we made this to here without jumping to havoc_stage or abandon_entry,
+		   we're properly done with deterministic steps and can mark it as such
+		   in the .state/ directory. */
+
+		if (!queue_cur->passed_det) mark_as_det_done(queue_cur);
+
+		/****************
+		 * RANDOM HAVOC *
+		 ****************/
+
+	havoc_stage:
+	pacemaker_fuzzing:
+
+
+		stage_cur_byte = -1;
+
+		/* The havoc stage mutation code is also invoked when splicing files; if the
+		   splice_cycle variable is set, generate different descriptions and such. */
+
+		if (!splice_cycle) {
+
+			stage_name = "MOpt-havoc";
+			stage_short = "MOpt_havoc";
+			stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
+				perf_score / havoc_div / 100;
+
+		}
+		else {
+
+			static u8 tmp[32];
+
+			perf_score = orig_perf;
+
+			sprintf(tmp, "MOpt-splice %u", splice_cycle);
+			stage_name = tmp;
+			stage_short = "MOpt_splice";
+			stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
+
+		}
+
+		s32 temp_len_puppet;
+		cur_ms_lv = get_cur_time();
+
+		{
+
+
+			if (key_puppet == 1)
+			{
+				if (unlikely(orig_hit_cnt_puppet == 0))
+				{
+					orig_hit_cnt_puppet = queued_paths + unique_crashes;
+					last_limit_time_start = get_cur_time();
+					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
+				}
+			}
+
+
+			{
+#ifndef IGNORE_FINDS
+			havoc_stage_puppet:
+#endif
+
+				stage_cur_byte = -1;
+
+				/* The havoc stage mutation code is also invoked when splicing files; if the
+				   splice_cycle variable is set, generate different descriptions and such. */
+
+				if (!splice_cycle) {
+
+					stage_name = "MOpt avoc";
+					stage_short = "MOpt_havoc";
+					stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
+						perf_score / havoc_div / 100;
+
+				}
+				else {
+					static u8 tmp[32];
+					perf_score = orig_perf;
+					sprintf(tmp, "MOpt splice %u", splice_cycle);
+					stage_name = tmp;
+					stage_short = "MOpt_splice";
+					stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
+				}
+
+
+
+				if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
+
+				temp_len = len;
+
+				orig_hit_cnt = queued_paths + unique_crashes;
+
+				havoc_queued = queued_paths;
+
+
+
+				for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+					u32 use_stacking = 1 << (1 + UR(HAVOC_STACK_POW2));
+
+					stage_cur_val = use_stacking;
+
+
+					for (i = 0; i < operator_num; ++i)
+					{
+						stage_cycles_puppet_v3[swarm_now][i] = stage_cycles_puppet_v2[swarm_now][i];
+					}
+
+
+					for (i = 0; i < use_stacking; ++i) {
+
+						switch (select_algorithm()) {
+
+						case 0:
+							/* Flip a single bit somewhere. Spooky! */
+							FLIP_BIT(out_buf, UR(temp_len << 3));
+							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP1] += 1;
+							break;
+
+
+						case 1:
+							if (temp_len < 2) break;
+							temp_len_puppet = UR(temp_len << 3);
+							FLIP_BIT(out_buf, temp_len_puppet);
+							FLIP_BIT(out_buf, temp_len_puppet + 1);
+							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP2] += 1;
+							break;
+
+						case 2:
+							if (temp_len < 2) break;
+							temp_len_puppet = UR(temp_len << 3);
+							FLIP_BIT(out_buf, temp_len_puppet);
+							FLIP_BIT(out_buf, temp_len_puppet + 1);
+							FLIP_BIT(out_buf, temp_len_puppet + 2);
+							FLIP_BIT(out_buf, temp_len_puppet + 3);
+							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP4] += 1;
+							break;
+
+						case 3:
+							if (temp_len < 4) break;
+							out_buf[UR(temp_len)] ^= 0xFF;
+							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP8] += 1;
+							break;
+
+						case 4:
+							if (temp_len < 8) break;
+							*(u16*)(out_buf + UR(temp_len - 1)) ^= 0xFFFF;
+							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP16] += 1;
+							break;
+
+						case 5:
+							if (temp_len < 8) break;
+							*(u32*)(out_buf + UR(temp_len - 3)) ^= 0xFFFFFFFF;
+							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP32] += 1;
+							break;
+
+						case 6:
+							out_buf[UR(temp_len)] -= 1 + UR(ARITH_MAX);
+							out_buf[UR(temp_len)] += 1 + UR(ARITH_MAX);
+							stage_cycles_puppet_v2[swarm_now][STAGE_ARITH8] += 1;
+							break;
+
+						case 7:
+							/* Randomly subtract from word, random endian. */
+							if (temp_len < 8) break;
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 1);
+								*(u16*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
+							}
+							else {
+								u32 pos = UR(temp_len - 1);
+								u16 num = 1 + UR(ARITH_MAX);
+								*(u16*)(out_buf + pos) =
+									SWAP16(SWAP16(*(u16*)(out_buf + pos)) - num);
+							}
+							/* Randomly add to word, random endian. */
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 1);
+								*(u16*)(out_buf + pos) += 1 + UR(ARITH_MAX);
+							}
+							else {
+								u32 pos = UR(temp_len - 1);
+								u16 num = 1 + UR(ARITH_MAX);
+								*(u16*)(out_buf + pos) =
+									SWAP16(SWAP16(*(u16*)(out_buf + pos)) + num);
+							}
+							stage_cycles_puppet_v2[swarm_now][STAGE_ARITH16] += 1;
+							break;
+
+
+						case 8:
+							/* Randomly subtract from dword, random endian. */
+							if (temp_len < 8) break;
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 3);
+								*(u32*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
+							}
+							else {
+								u32 pos = UR(temp_len - 3);
+								u32 num = 1 + UR(ARITH_MAX);
+								*(u32*)(out_buf + pos) =
+									SWAP32(SWAP32(*(u32*)(out_buf + pos)) - num);
+							}
+							/* Randomly add to dword, random endian. */
+							//if (temp_len < 4) break;
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 3);
+								*(u32*)(out_buf + pos) += 1 + UR(ARITH_MAX);
+							}
+							else {
+								u32 pos = UR(temp_len - 3);
+								u32 num = 1 + UR(ARITH_MAX);
+								*(u32*)(out_buf + pos) =
+									SWAP32(SWAP32(*(u32*)(out_buf + pos)) + num);
+							}
+							stage_cycles_puppet_v2[swarm_now][STAGE_ARITH32] += 1;
+							break;
+
+
+						case 9:
+							/* Set byte to interesting value. */
+							if (temp_len < 4) break;
+							out_buf[UR(temp_len)] = interesting_8[UR(sizeof(interesting_8))];
+							stage_cycles_puppet_v2[swarm_now][STAGE_INTEREST8] += 1;
+							break;
+
+						case 10:
+							/* Set word to interesting value, randomly choosing endian. */
+							if (temp_len < 8) break;
+							if (UR(2)) {
+								*(u16*)(out_buf + UR(temp_len - 1)) =
+									interesting_16[UR(sizeof(interesting_16) >> 1)];
+							}
+							else {
+								*(u16*)(out_buf + UR(temp_len - 1)) = SWAP16(
+									interesting_16[UR(sizeof(interesting_16) >> 1)]);
+							}
+							stage_cycles_puppet_v2[swarm_now][STAGE_INTEREST16] += 1;
+							break;
+
+
+						case 11:
+							/* Set dword to interesting value, randomly choosing endian. */
+
+							if (temp_len < 8) break;
+
+							if (UR(2)) {
+								*(u32*)(out_buf + UR(temp_len - 3)) =
+									interesting_32[UR(sizeof(interesting_32) >> 2)];
+							}
+							else {
+								*(u32*)(out_buf + UR(temp_len - 3)) = SWAP32(
+									interesting_32[UR(sizeof(interesting_32) >> 2)]);
+							}
+							stage_cycles_puppet_v2[swarm_now][STAGE_INTEREST32] += 1;
+							break;
+
+
+						case 12:
+
+							/* Just set a random byte to a random value. Because,
+							   why not. We use XOR with 1-255 to eliminate the
+							   possibility of a no-op. */
+
+							out_buf[UR(temp_len)] ^= 1 + UR(255);
+							stage_cycles_puppet_v2[swarm_now][STAGE_RANDOMBYTE] += 1;
+							break;
+
+
+
+						case 13: {
+
+							/* Delete bytes. We're making this a bit more likely
+							   than insertion (the next option) in hopes of keeping
+							   files reasonably small. */
+
+							u32 del_from, del_len;
+
+							if (temp_len < 2) break;
+
+							/* Don't delete too much. */
+
+							del_len = choose_block_len(temp_len - 1);
+
+							del_from = UR(temp_len - del_len + 1);
+
+							memmove(out_buf + del_from, out_buf + del_from + del_len,
+								temp_len - del_from - del_len);
+
+							temp_len -= del_len;
+							stage_cycles_puppet_v2[swarm_now][STAGE_DELETEBYTE] += 1;
+							break;
+
+						}
+
+						case 14:
+
+							if (temp_len + HAVOC_BLK_XL < MAX_FILE) {
+
+								/* Clone bytes (75%) or insert a block of constant bytes (25%). */
+
+								u8  actually_clone = UR(4);
+								u32 clone_from, clone_to, clone_len;
+								u8* new_buf;
+
+								if (actually_clone) {
+
+									clone_len = choose_block_len(temp_len);
+									clone_from = UR(temp_len - clone_len + 1);
+
+								}
+								else {
+
+									clone_len = choose_block_len(HAVOC_BLK_XL);
+									clone_from = 0;
+
+								}
+
+								clone_to = UR(temp_len);
+
+								new_buf = ck_alloc_nozero(temp_len + clone_len);
+
+								/* Head */
+
+								memcpy(new_buf, out_buf, clone_to);
+
+								/* Inserted part */
+
+								if (actually_clone)
+									memcpy(new_buf + clone_to, out_buf + clone_from, clone_len);
+								else
+									memset(new_buf + clone_to,
+										UR(2) ? UR(256) : out_buf[UR(temp_len)], clone_len);
+
+								/* Tail */
+								memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
+									temp_len - clone_to);
+
+								ck_free(out_buf);
+								out_buf = new_buf;
+								temp_len += clone_len;
+								stage_cycles_puppet_v2[swarm_now][STAGE_Clone75] += 1;
+							}
+
+							break;
+
+						case 15: {
+
+							/* Overwrite bytes with a randomly selected chunk (75%) or fixed
+							   bytes (25%). */
+
+							u32 copy_from, copy_to, copy_len;
+
+							if (temp_len < 2) break;
+
+							copy_len = choose_block_len(temp_len - 1);
+
+							copy_from = UR(temp_len - copy_len + 1);
+							copy_to = UR(temp_len - copy_len + 1);
+
+							if (UR(4)) {
+
+								if (copy_from != copy_to)
+									memmove(out_buf + copy_to, out_buf + copy_from, copy_len);
+
+							}
+							else memset(out_buf + copy_to,
+								UR(2) ? UR(256) : out_buf[UR(temp_len)], copy_len);
+							stage_cycles_puppet_v2[swarm_now][STAGE_OverWrite75] += 1;
+							break;
+
+						}
+
+
+						}
+
+					}
+
+
+					tmp_pilot_time += 1;
+
+
+
+
+					u64 temp_total_found = queued_paths + unique_crashes;
+
+
+
+
+					if (common_fuzz_stuff(argv, out_buf, temp_len))
+						goto abandon_entry_puppet;
+
+					/* out_buf might have been mangled a bit, so let's restore it to its
+					   original size and shape. */
+
+					if (temp_len < len) out_buf = ck_realloc(out_buf, len);
+					temp_len = len;
+					memcpy(out_buf, in_buf, len);
+
+					/* If we're finding new stuff, let's run for a bit longer, limits
+					   permitting. */
+
+					if (queued_paths != havoc_queued) {
+
+						if (perf_score <= havoc_max_mult * 100) {
+							stage_max *= 2;
+							perf_score *= 2;
+						}
+
+						havoc_queued = queued_paths;
+
+					}
+
+					if (unlikely(queued_paths + unique_crashes > temp_total_found))
+					{
+						u64 temp_temp_puppet = queued_paths + unique_crashes - temp_total_found;
+						total_puppet_find = total_puppet_find + temp_temp_puppet;
+						for (i = 0; i < 16; ++i)
+						{
+							if (stage_cycles_puppet_v2[swarm_now][i] > stage_cycles_puppet_v3[swarm_now][i])
+								stage_finds_puppet_v2[swarm_now][i] += temp_temp_puppet;
+						}
+					}
+
+				}
+				new_hit_cnt = queued_paths + unique_crashes;
+
+				if (!splice_cycle) {
+          stage_finds[STAGE_HAVOC]  += new_hit_cnt - orig_hit_cnt;
+          stage_cycles[STAGE_HAVOC] += stage_max;
+        } else {
+          stage_finds[STAGE_SPLICE]  += new_hit_cnt - orig_hit_cnt;
+          stage_cycles[STAGE_SPLICE] += stage_max;
+        }
+
+#ifndef IGNORE_FINDS
+
+				/************
+				 * SPLICING *
+				 ************/
+
+
+			retry_splicing_puppet:
+
+				if (use_splicing && splice_cycle++ < SPLICE_CYCLES_puppet &&
+					queued_paths > 1 && queue_cur->len > 1) {
+
+					struct queue_entry* target;
+					u32 tid, split_at;
+					u8* new_buf;
+					s32 f_diff, l_diff;
+
+					/* First of all, if we've modified in_buf for havoc, let's clean that
+					   up... */
+
+					if (in_buf != orig_in) {
+						ck_free(in_buf);
+						in_buf = orig_in;
+						len = queue_cur->len;
+					}
+
+					/* Pick a random queue entry and seek to it. Don't splice with yourself. */
+
+					do { tid = UR(queued_paths); } while (tid == current_entry);
+
+					splicing_with = tid;
+					target = queue;
+
+					while (tid >= 100) { target = target->next_100; tid -= 100; }
+					while (tid--) target = target->next;
+
+					/* Make sure that the target has a reasonable length. */
+
+					while (target && (target->len < 2 || target == queue_cur)) {
+						target = target->next;
+						++splicing_with;
+					}
+
+					if (!target) goto retry_splicing_puppet;
+
+					/* Read the testcase into a new buffer. */
+
+					fd = open(target->fname, O_RDONLY);
+
+					if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
+
+					new_buf = ck_alloc_nozero(target->len);
+
+					ck_read(fd, new_buf, target->len, target->fname);
+
+					close(fd);
+
+					/* Find a suitable splicin g location, somewhere between the first and
+					   the last differing byte. Bail out if the difference is just a single
+					   byte or so. */
+
+					locate_diffs(in_buf, new_buf, MIN(len, target->len), &f_diff, &l_diff);
+
+					if (f_diff < 0 || l_diff < 2 || f_diff == l_diff) {
+						ck_free(new_buf);
+						goto retry_splicing_puppet;
+					}
+
+					/* Split somewhere between the first and last differing byte. */
+
+					split_at = f_diff + UR(l_diff - f_diff);
+
+					/* Do the thing. */
+
+					len = target->len;
+					memcpy(new_buf, in_buf, split_at);
+					in_buf = new_buf;
+					ck_free(out_buf);
+					out_buf = ck_alloc_nozero(len);
+					memcpy(out_buf, in_buf, len);
+					goto havoc_stage_puppet;
+
+				}
+
+#endif /* !IGNORE_FINDS */
+
+				ret_val = 0;
+
+			abandon_entry:
+			abandon_entry_puppet:
+
+				if (splice_cycle >= SPLICE_CYCLES_puppet)
+					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
+
+
+				splicing_with = -1;
+
+				/* Update pending_not_fuzzed count if we made it through the calibration
+				   cycle and have not seen this entry before. */
+
+				   // if (!stop_soon && !queue_cur->cal_failed && !queue_cur->was_fuzzed) {
+				   //   queue_cur->was_fuzzed = 1;
+				   //   --pending_not_fuzzed;
+				   //   if (queue_cur->favored) --pending_favored;
+				   // }
+
+				munmap(orig_in, queue_cur->len);
+
+				if (in_buf != orig_in) ck_free(in_buf);
+				ck_free(out_buf);
+				ck_free(eff_map);
+
+
+				if (key_puppet == 1) {
+					if (unlikely(queued_paths + unique_crashes > ((queued_paths + unique_crashes)*limit_time_bound + orig_hit_cnt_puppet)))	{
+						key_puppet = 0;
+						cur_ms_lv = get_cur_time();
+						new_hit_cnt = queued_paths + unique_crashes;
+						orig_hit_cnt_puppet = 0;
+						last_limit_time_start = 0;
+					}
+				}
+
+
+				if (unlikely(tmp_pilot_time > period_pilot)) {
+					total_pacemaker_time += tmp_pilot_time;
+					new_hit_cnt = queued_paths + unique_crashes;
+					swarm_fitness[swarm_now] = (double)(total_puppet_find - temp_puppet_find) / ((double)(tmp_pilot_time)/ period_pilot_tmp);
+					tmp_pilot_time = 0;
+					temp_puppet_find = total_puppet_find;
+
+					u64 temp_stage_finds_puppet = 0;
+					for (i = 0; i < operator_num; ++i) {
+						double temp_eff = 0.0;
+
+						if (stage_cycles_puppet_v2[swarm_now][i] > stage_cycles_puppet[swarm_now][i])
+							temp_eff = (double)(stage_finds_puppet_v2[swarm_now][i] - stage_finds_puppet[swarm_now][i]) /
+							(double)(stage_cycles_puppet_v2[swarm_now][i] - stage_cycles_puppet[swarm_now][i]);
+
+						if (eff_best[swarm_now][i] < temp_eff) {
+							eff_best[swarm_now][i] = temp_eff;
+							L_best[swarm_now][i] = x_now[swarm_now][i];
+						}
+
+						stage_finds_puppet[swarm_now][i] = stage_finds_puppet_v2[swarm_now][i];
+						stage_cycles_puppet[swarm_now][i] = stage_cycles_puppet_v2[swarm_now][i];
+						temp_stage_finds_puppet += stage_finds_puppet[swarm_now][i];
+					}
+
+					swarm_now = swarm_now + 1;
+						if (swarm_now == swarm_num) {
+							key_module = 1;
+							for (i = 0; i < operator_num; ++i) {
+								core_operator_cycles_puppet_v2[i] = core_operator_cycles_puppet[i];
+								core_operator_cycles_puppet_v3[i] = core_operator_cycles_puppet[i];
+								core_operator_finds_puppet_v2[i] = core_operator_finds_puppet[i];
+							}
+
+							double swarm_eff = 0.0;
+							swarm_now = 0;
+							for (i = 0; i < swarm_num; ++i)	{
+								if (swarm_fitness[i] > swarm_eff) {
+									swarm_eff = swarm_fitness[i];
+									swarm_now = i;
+								}
+							}
+							if (swarm_now <0 || swarm_now > swarm_num - 1)
+								PFATAL("swarm_now error number  %d", swarm_now);
+
+						}
+				}
+				return ret_val;
+			}
+		}
+
+
+#undef FLIP_BIT
+
+}
+
+
+u8 core_fuzzing(char** argv) {
+	int i;
+
+	if (swarm_num == 1) {
+		key_module = 2;
+		return 0;
+	}
+
+
+		s32 len, fd, temp_len, j;
+		u8  *in_buf, *out_buf, *orig_in, *ex_tmp, *eff_map = 0;
+		u64 havoc_queued, orig_hit_cnt, new_hit_cnt, cur_ms_lv;
+		u32 splice_cycle = 0, perf_score = 100, orig_perf, prev_cksum, eff_cnt = 1;
+
+		u8  ret_val = 1, doing_det = 0;
+
+		u8  a_collect[MAX_AUTO_EXTRA];
+		u32 a_len = 0;
+
+#ifdef IGNORE_FINDS
+
+		/* In IGNORE_FINDS mode, skip any entries that weren't in the
+		   initial data set. */
+
+		if (queue_cur->depth > 1) return 1;
+
+#else
+
+		if (pending_favored) {
+
+			/* If we have any favored, non-fuzzed new arrivals in the queue,
+			   possibly skip to them at the expense of already-fuzzed or non-favored
+			   cases. */
+
+			if ((queue_cur->was_fuzzed || !queue_cur->favored) &&
+				UR(100) < SKIP_TO_NEW_PROB) return 1;
+
+		} else if (!dumb_mode && !queue_cur->favored && queued_paths > 10) {
+
+			/* Otherwise, still possibly skip non-favored cases, albeit less often.
+			   The odds of skipping stuff are higher for already-fuzzed inputs and
+			   lower for never-fuzzed entries. */
+
+			if (queue_cycle > 1 && !queue_cur->was_fuzzed) {
+
+				if (UR(100) < SKIP_NFAV_NEW_PROB) return 1;
+
+			} else {
+
+				if (UR(100) < SKIP_NFAV_OLD_PROB) return 1;
+
+			}
+
+		}
+
+#endif /* ^IGNORE_FINDS */
+
+		if (not_on_tty) {
+			ACTF("Fuzzing test case #%u (%u total, %llu uniq crashes found)...",
+				current_entry, queued_paths, unique_crashes);
+			fflush(stdout);
+		}
+
+		/* Map the test case into memory. */
+
+		fd = open(queue_cur->fname, O_RDONLY);
+
+		if (fd < 0) PFATAL("Unable to open '%s'", queue_cur->fname);
+
+		len = queue_cur->len;
+
+		orig_in = in_buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+
+		if (orig_in == MAP_FAILED) PFATAL("Unable to mmap '%s'", queue_cur->fname);
+
+		close(fd);
+
+		/* We could mmap() out_buf as MAP_PRIVATE, but we end up clobbering every
+		   single byte anyway, so it wouldn't give us any performance or memory usage
+		   benefits. */
+
+		out_buf = ck_alloc_nozero(len);
+
+		subseq_tmouts = 0;
+
+		cur_depth = queue_cur->depth;
+
+		/*******************************************
+		 * CALIBRATION (only if failed earlier on) *
+		 *******************************************/
+
+		if (queue_cur->cal_failed) {
+
+			u8 res = FAULT_TMOUT;
+
+			if (queue_cur->cal_failed < CAL_CHANCES) {
+
+				res = calibrate_case(argv, queue_cur, in_buf, queue_cycle - 1, 0);
+
+				if (res == FAULT_ERROR)
+					FATAL("Unable to execute target application");
+
+			}
+
+			if (stop_soon || res != crash_mode) {
+				++cur_skipped_paths;
+				goto abandon_entry;
+			}
+
+		}
+
+		/************
+		 * TRIMMING *
+		 ************/
+
+		if (!dumb_mode && !queue_cur->trim_done) {
+
+			u8 res = trim_case(argv, queue_cur, in_buf);
+
+			if (res == FAULT_ERROR)
+				FATAL("Unable to execute target application");
+
+			if (stop_soon) {
+				++cur_skipped_paths;
+				goto abandon_entry;
+			}
+
+			/* Don't retry trimming, even if it failed. */
+
+			queue_cur->trim_done = 1;
+
+			len = queue_cur->len;
+
+		}
+
+		memcpy(out_buf, in_buf, len);
+
+		/*********************
+		 * PERFORMANCE SCORE *
+		 *********************/
+
+		orig_perf = perf_score = calculate_score(queue_cur);
+
+		/* Skip right away if -d is given, if we have done deterministic fuzzing on
+		   this entry ourselves (was_fuzzed), or if it has gone through deterministic
+		   testing in earlier, resumed runs (passed_det). */
+
+		if (skip_deterministic || queue_cur->was_fuzzed || queue_cur->passed_det)
+			goto havoc_stage;
+
+		/* Skip deterministic fuzzing if exec path checksum puts this out of scope
+		   for this master instance. */
+
+		if (master_max && (queue_cur->exec_cksum % master_max) != master_id - 1)
+			goto havoc_stage;
+
+
+		cur_ms_lv = get_cur_time();
+		if (!(key_puppet == 0 && ((cur_ms_lv - last_path_time < limit_time_puppet) ||
+			(last_crash_time != 0 && cur_ms_lv - last_crash_time < limit_time_puppet) || last_path_time == 0)))
+		{
+			key_puppet = 1;
+			goto pacemaker_fuzzing;
+		}
+
+		doing_det = 1;
+
+		/*********************************************
+		 * SIMPLE BITFLIP (+dictionary construction) *
+		 *********************************************/
+
+#define FLIP_BIT(_ar, _b) do { \
+    u8* _arf = (u8*)(_ar); \
+    u32 _bf = (_b); \
+    _arf[(_bf) >> 3] ^= (128 >> ((_bf) & 7)); \
+  } while (0)
+
+		 /* Single walking bit. */
+
+		stage_short = "flip1";
+		stage_max = len << 3;
+		stage_name = "bitflip 1/1";
+
+		stage_val_type = STAGE_VAL_NONE;
+
+		orig_hit_cnt = queued_paths + unique_crashes;
+
+		prev_cksum = queue_cur->exec_cksum;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur >> 3;
+
+			FLIP_BIT(out_buf, stage_cur);
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			FLIP_BIT(out_buf, stage_cur);
+
+			/* While flipping the least significant bit in every byte, pull of an extra
+			   trick to detect possible syntax tokens. In essence, the idea is that if
+			   you have a binary blob like this:
+
+			   xxxxxxxxIHDRxxxxxxxx
+
+			   ...and changing the leading and trailing bytes causes variable or no
+			   changes in program flow, but touching any character in the "IHDR" string
+			   always produces the same, distinctive path, it's highly likely that
+			   "IHDR" is an atomically-checked magic value of special significance to
+			   the fuzzed format.
+
+			   We do this here, rather than as a separate stage, because it's a nice
+			   way to keep the operation approximately "free" (i.e., no extra execs).
+
+			   Empirically, performing the check when flipping the least significant bit
+			   is advantageous, compared to doing it at the time of more disruptive
+			   changes, where the program flow may be affected in more violent ways.
+
+			   The caveat is that we won't generate dictionaries in the -d mode or -S
+			   mode - but that's probably a fair trade-off.
+
+			   This won't work particularly well with paths that exhibit variable
+			   behavior, but fails gracefully, so we'll carry out the checks anyway.
+
+			  */
+
+			if (!dumb_mode && (stage_cur & 7) == 7) {
+
+				u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+				if (stage_cur == stage_max - 1 && cksum == prev_cksum) {
+
+					/* If at end of file and we are still collecting a string, grab the
+					   final character and force output. */
+
+					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
+					++a_len;
+
+					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
+						maybe_add_auto(a_collect, a_len);
+
+				}
+				else if (cksum != prev_cksum) {
+
+					/* Otherwise, if the checksum has changed, see if we have something
+					   worthwhile queued up, and collect that if the answer is yes. */
+
+					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
+						maybe_add_auto(a_collect, a_len);
+
+					a_len = 0;
+					prev_cksum = cksum;
+
+				}
+
+				/* Continue collecting string, but only if the bit flip actually made
+				   any difference - we don't want no-op tokens. */
+
+				if (cksum != queue_cur->exec_cksum) {
+
+					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
+					++a_len;
+
+				}
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP1] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP1] += stage_max;
+
+
+
+		/* Two walking bits. */
+
+		stage_name = "bitflip 2/1";
+		stage_short = "flip2";
+		stage_max = (len << 3) - 1;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur >> 3;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP2] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP2] += stage_max;
+
+
+		/* Four walking bits. */
+
+		stage_name = "bitflip 4/1";
+		stage_short = "flip4";
+		stage_max = (len << 3) - 3;
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur >> 3;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+			FLIP_BIT(out_buf, stage_cur + 2);
+			FLIP_BIT(out_buf, stage_cur + 3);
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			FLIP_BIT(out_buf, stage_cur);
+			FLIP_BIT(out_buf, stage_cur + 1);
+			FLIP_BIT(out_buf, stage_cur + 2);
+			FLIP_BIT(out_buf, stage_cur + 3);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP4] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP4] += stage_max;
+
+
+		/* Effector map setup. These macros calculate:
+
+		   EFF_APOS      - position of a particular file offset in the map.
+		   EFF_ALEN      - length of a map with a particular number of bytes.
+		   EFF_SPAN_ALEN - map span for a sequence of bytes.
+
+		 */
+
+#define EFF_APOS(_p)          ((_p) >> EFF_MAP_SCALE2)
+#define EFF_REM(_x)           ((_x) & ((1 << EFF_MAP_SCALE2) - 1))
+#define EFF_ALEN(_l)          (EFF_APOS(_l) + !!EFF_REM(_l))
+#define EFF_SPAN_ALEN(_p, _l) (EFF_APOS((_p) + (_l) - 1) - EFF_APOS(_p) + 1)
+
+		 /* Initialize effector map for the next step (see comments below). Always
+			flag first and last byte as doing something. */
+
+		eff_map = ck_alloc(EFF_ALEN(len));
+		eff_map[0] = 1;
+
+		if (EFF_APOS(len - 1) != 0) {
+			eff_map[EFF_APOS(len - 1)] = 1;
+			++eff_cnt;
+		}
+
+		/* Walking byte. */
+
+		stage_name = "bitflip 8/8";
+		stage_short = "flip8";
+		stage_max = len;
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+			stage_cur_byte = stage_cur;
+
+			out_buf[stage_cur] ^= 0xFF;
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+			/* We also use this stage to pull off a simple trick: we identify
+			   bytes that seem to have no effect on the current execution path
+			   even when fully flipped - and we skip them during more expensive
+			   deterministic stages, such as arithmetics or known ints. */
+
+			if (!eff_map[EFF_APOS(stage_cur)]) {
+
+				u32 cksum;
+
+				/* If in dumb mode or if the file is very short, just flag everything
+				   without wasting time on checksums. */
+
+				if (!dumb_mode && len >= EFF_MIN_LEN)
+					cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+				else
+					cksum = ~queue_cur->exec_cksum;
+
+				if (cksum != queue_cur->exec_cksum) {
+					eff_map[EFF_APOS(stage_cur)] = 1;
+					++eff_cnt;
+				}
+
+			}
+
+			out_buf[stage_cur] ^= 0xFF;
+
+		}
+
+		/* If the effector map is more than EFF_MAX_PERC dense, just flag the
+		   whole thing as worth fuzzing, since we wouldn't be saving much time
+		   anyway. */
+
+		if (eff_cnt != EFF_ALEN(len) &&
+			eff_cnt * 100 / EFF_ALEN(len) > EFF_MAX_PERC) {
+
+			memset(eff_map, 1, EFF_ALEN(len));
+
+			blocks_eff_select += EFF_ALEN(len);
+
+		}
+		else {
+
+			blocks_eff_select += eff_cnt;
+
+		}
+
+		blocks_eff_total += EFF_ALEN(len);
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP8] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP8] += stage_max;
+
+
+
+		/* Two walking bytes. */
+
+		if (len < 2) goto skip_bitflip;
+
+		stage_name = "bitflip 16/8";
+		stage_short = "flip16";
+		stage_cur = 0;
+		stage_max = len - 1;
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 1; ++i) {
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+				--stage_max;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			*(u16*)(out_buf + i) ^= 0xFFFF;
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+			++stage_cur;
+
+			*(u16*)(out_buf + i) ^= 0xFFFF;
+
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP16] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP16] += stage_max;
+
+
+
+		if (len < 4) goto skip_bitflip;
+
+		/* Four walking bytes. */
+
+		stage_name = "bitflip 32/8";
+		stage_short = "flip32";
+		stage_cur = 0;
+		stage_max = len - 3;
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 3; ++i) {
+
+			/* Let's consult the effector map... */
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+				--stage_max;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
+
+			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+			++stage_cur;
+
+			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_FLIP32] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_FLIP32] += stage_max;
+
+
+
+
+	skip_bitflip:
+
+		if (no_arith) goto skip_arith;
+
+		/**********************
+		 * ARITHMETIC INC/DEC *
+		 **********************/
+
+		 /* 8-bit arithmetics. */
+
+		stage_name = "arith 8/8";
+		stage_short = "arith8";
+		stage_cur = 0;
+		stage_max = 2 * len * ARITH_MAX;
+
+
+		stage_val_type = STAGE_VAL_LE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len; ++i) {
+
+			u8 orig = out_buf[i];
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)]) {
+				stage_max -= 2 * ARITH_MAX;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 1; j <= ARITH_MAX; ++j) {
+
+				u8 r = orig ^ (orig + j);
+
+				/* Do arithmetic operations only if the result couldn't be a product
+				   of a bitflip. */
+
+				if (!could_be_bitflip(r)) {
+
+					stage_cur_val = j;
+					out_buf[i] = orig + j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				r = orig ^ (orig - j);
+
+				if (!could_be_bitflip(r)) {
+
+					stage_cur_val = -j;
+					out_buf[i] = orig - j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				out_buf[i] = orig;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_ARITH8] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_ARITH8] += stage_max;
+
+
+
+
+		/* 16-bit arithmetics, both endians. */
+
+		if (len < 2) goto skip_arith;
+
+		stage_name = "arith 16/8";
+		stage_short = "arith16";
+		stage_cur = 0;
+		stage_max = 4 * (len - 1) * ARITH_MAX;
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 1; ++i) {
+
+			u16 orig = *(u16*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+				stage_max -= 4 * ARITH_MAX;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 1; j <= ARITH_MAX; ++j) {
+
+				u16 r1 = orig ^ (orig + j),
+					r2 = orig ^ (orig - j),
+					r3 = orig ^ SWAP16(SWAP16(orig) + j),
+					r4 = orig ^ SWAP16(SWAP16(orig) - j);
+
+				/* Try little endian addition and subtraction first. Do it only
+				   if the operation would affect more than one byte (hence the
+				   & 0xff overflow checks) and if it couldn't be a product of
+				   a bitflip. */
+
+				stage_val_type = STAGE_VAL_LE;
+
+				if ((orig & 0xff) + j > 0xff && !could_be_bitflip(r1)) {
+
+					stage_cur_val = j;
+					*(u16*)(out_buf + i) = orig + j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((orig & 0xff) < j && !could_be_bitflip(r2)) {
+
+					stage_cur_val = -j;
+					*(u16*)(out_buf + i) = orig - j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				/* Big endian comes next. Same deal. */
+
+				stage_val_type = STAGE_VAL_BE;
+
+
+				if ((orig >> 8) + j > 0xff && !could_be_bitflip(r3)) {
+
+					stage_cur_val = j;
+					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) + j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((orig >> 8) < j && !could_be_bitflip(r4)) {
+
+					stage_cur_val = -j;
+					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) - j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				*(u16*)(out_buf + i) = orig;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_ARITH16] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_ARITH16] += stage_max;
+
+
+
+		/* 32-bit arithmetics, both endians. */
+
+		if (len < 4) goto skip_arith;
+
+		stage_name = "arith 32/8";
+		stage_short = "arith32";
+		stage_cur = 0;
+		stage_max = 4 * (len - 3) * ARITH_MAX;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 3; ++i) {
+
+			u32 orig = *(u32*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+				stage_max -= 4 * ARITH_MAX;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 1; j <= ARITH_MAX; ++j) {
+
+				u32 r1 = orig ^ (orig + j),
+					r2 = orig ^ (orig - j),
+					r3 = orig ^ SWAP32(SWAP32(orig) + j),
+					r4 = orig ^ SWAP32(SWAP32(orig) - j);
+
+				/* Little endian first. Same deal as with 16-bit: we only want to
+				   try if the operation would have effect on more than two bytes. */
+
+				stage_val_type = STAGE_VAL_LE;
+
+				if ((orig & 0xffff) + j > 0xffff && !could_be_bitflip(r1)) {
+
+					stage_cur_val = j;
+					*(u32*)(out_buf + i) = orig + j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((orig & 0xffff) < j && !could_be_bitflip(r2)) {
+
+					stage_cur_val = -j;
+					*(u32*)(out_buf + i) = orig - j;
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				/* Big endian next. */
+
+				stage_val_type = STAGE_VAL_BE;
+
+				if ((SWAP32(orig) & 0xffff) + j > 0xffff && !could_be_bitflip(r3)) {
+
+					stage_cur_val = j;
+					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) + j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((SWAP32(orig) & 0xffff) < j && !could_be_bitflip(r4)) {
+
+					stage_cur_val = -j;
+					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) - j);
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				*(u32*)(out_buf + i) = orig;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_ARITH32] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_ARITH32] += stage_max;
+
+
+
+	skip_arith:
+
+		/**********************
+		 * INTERESTING VALUES *
+		 **********************/
+
+		stage_name = "interest 8/8";
+		stage_short = "int8";
+		stage_cur = 0;
+		stage_max = len * sizeof(interesting_8);
+
+
+
+		stage_val_type = STAGE_VAL_LE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		/* Setting 8-bit integers. */
+
+		for (i = 0; i < len; ++i) {
+
+			u8 orig = out_buf[i];
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)]) {
+				stage_max -= sizeof(interesting_8);
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < sizeof(interesting_8); ++j) {
+
+				/* Skip if the value could be a product of bitflips or arithmetics. */
+
+				if (could_be_bitflip(orig ^ (u8)interesting_8[j]) ||
+					could_be_arith(orig, (u8)interesting_8[j], 1)) {
+					--stage_max;
+					continue;
+				}
+
+				stage_cur_val = interesting_8[j];
+				out_buf[i] = interesting_8[j];
+
+				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+				out_buf[i] = orig;
+				++stage_cur;
+
+			}
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_INTEREST8] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_INTEREST8] += stage_max;
+
+
+
+		/* Setting 16-bit integers, both endians. */
+
+		if (no_arith || len < 2) goto skip_interest;
+
+		stage_name = "interest 16/8";
+		stage_short = "int16";
+		stage_cur = 0;
+		stage_max = 2 * (len - 1) * (sizeof(interesting_16) >> 1);
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 1; ++i) {
+
+			u16 orig = *(u16*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
+				stage_max -= sizeof(interesting_16);
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
+
+				stage_cur_val = interesting_16[j];
+
+				/* Skip if this could be a product of a bitflip, arithmetics,
+				   or single-byte interesting value insertion. */
+
+				if (!could_be_bitflip(orig ^ (u16)interesting_16[j]) &&
+					!could_be_arith(orig, (u16)interesting_16[j], 2) &&
+					!could_be_interest(orig, (u16)interesting_16[j], 2, 0)) {
+
+					stage_val_type = STAGE_VAL_LE;
+
+					*(u16*)(out_buf + i) = interesting_16[j];
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((u16)interesting_16[j] != SWAP16(interesting_16[j]) &&
+					!could_be_bitflip(orig ^ SWAP16(interesting_16[j])) &&
+					!could_be_arith(orig, SWAP16(interesting_16[j]), 2) &&
+					!could_be_interest(orig, SWAP16(interesting_16[j]), 2, 1)) {
+
+					stage_val_type = STAGE_VAL_BE;
+
+					*(u16*)(out_buf + i) = SWAP16(interesting_16[j]);
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+			}
+
+			*(u16*)(out_buf + i) = orig;
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_INTEREST16] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_INTEREST16] += stage_max;
+
+
+
+
+		if (len < 4) goto skip_interest;
+
+		/* Setting 32-bit integers, both endians. */
+
+		stage_name = "interest 32/8";
+		stage_short = "int32";
+		stage_cur = 0;
+		stage_max = 2 * (len - 3) * (sizeof(interesting_32) >> 2);
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len - 3; ++i) {
+
+			u32 orig = *(u32*)(out_buf + i);
+
+			/* Let's consult the effector map... */
+
+			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
+				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
+				stage_max -= sizeof(interesting_32) >> 1;
+				continue;
+			}
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < sizeof(interesting_32) / 4; ++j) {
+
+				stage_cur_val = interesting_32[j];
+
+				/* Skip if this could be a product of a bitflip, arithmetics,
+				   or word interesting value insertion. */
+
+				if (!could_be_bitflip(orig ^ (u32)interesting_32[j]) &&
+					!could_be_arith(orig, interesting_32[j], 4) &&
+					!could_be_interest(orig, interesting_32[j], 4, 0)) {
+
+					stage_val_type = STAGE_VAL_LE;
+
+					*(u32*)(out_buf + i) = interesting_32[j];
+
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+				if ((u32)interesting_32[j] != SWAP32(interesting_32[j]) &&
+					!could_be_bitflip(orig ^ SWAP32(interesting_32[j])) &&
+					!could_be_arith(orig, SWAP32(interesting_32[j]), 4) &&
+					!could_be_interest(orig, SWAP32(interesting_32[j]), 4, 1)) {
+
+					stage_val_type = STAGE_VAL_BE;
+
+					*(u32*)(out_buf + i) = SWAP32(interesting_32[j]);
+					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+					++stage_cur;
+
+				} else --stage_max;
+
+			}
+
+			*(u32*)(out_buf + i) = orig;
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_INTEREST32] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_INTEREST32] += stage_max;
+
+
+
+	skip_interest:
+
+		/********************
+		 * DICTIONARY STUFF *
+		 ********************/
+
+		if (!extras_cnt) goto skip_user_extras;
+
+		/* Overwrite with user-supplied extras. */
+
+		stage_name = "user extras (over)";
+		stage_short = "ext_UO";
+		stage_cur = 0;
+		stage_max = extras_cnt * len;
+
+
+		stage_val_type = STAGE_VAL_NONE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len; ++i) {
+
+			u32 last_len = 0;
+
+			stage_cur_byte = i;
+
+			/* Extras are sorted by size, from smallest to largest. This means
+			   that we don't have to worry about restoring the buffer in
+			   between writes at a particular offset determined by the outer
+			   loop. */
+
+			for (j = 0; j < extras_cnt; ++j) {
+
+				/* Skip extras probabilistically if extras_cnt > MAX_DET_EXTRAS. Also
+				   skip them if there's no room to insert the payload, if the token
+				   is redundant, or if its entire span has no bytes set in the effector
+				   map. */
+
+				if ((extras_cnt > MAX_DET_EXTRAS && UR(extras_cnt) >= MAX_DET_EXTRAS) ||
+					extras[j].len > len - i ||
+					!memcmp(extras[j].data, out_buf + i, extras[j].len) ||
+					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, extras[j].len))) {
+
+					--stage_max;
+					continue;
+
+				}
+
+				last_len = extras[j].len;
+				memcpy(out_buf + i, extras[j].data, last_len);
+
+				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+				++stage_cur;
+
+			}
+
+			/* Restore all the clobbered memory. */
+			memcpy(out_buf + i, in_buf + i, last_len);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_EXTRAS_UO] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_EXTRAS_UO] += stage_max;
+
+		/* Insertion of user-supplied extras. */
+
+		stage_name = "user extras (insert)";
+		stage_short = "ext_UI";
+		stage_cur = 0;
+		stage_max = extras_cnt * len;
+
+
+
+
+		orig_hit_cnt = new_hit_cnt;
+
+		ex_tmp = ck_alloc(len + MAX_DICT_FILE);
+
+		for (i = 0; i <= len; ++i) {
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < extras_cnt; ++j) {
+
+				if (len + extras[j].len > MAX_FILE) {
+					--stage_max;
+					continue;
+				}
+
+				/* Insert token */
+				memcpy(ex_tmp + i, extras[j].data, extras[j].len);
+
+				/* Copy tail */
+				memcpy(ex_tmp + i + extras[j].len, out_buf + i, len - i);
+
+				if (common_fuzz_stuff(argv, ex_tmp, len + extras[j].len)) {
+					ck_free(ex_tmp);
+					goto abandon_entry;
+				}
+
+				++stage_cur;
+
+			}
+
+			/* Copy head */
+			ex_tmp[i] = out_buf[i];
+
+		}
+
+		ck_free(ex_tmp);
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_EXTRAS_UI] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_EXTRAS_UI] += stage_max;
+
+	skip_user_extras:
+
+		if (!a_extras_cnt) goto skip_extras;
+
+		stage_name = "auto extras (over)";
+		stage_short = "ext_AO";
+		stage_cur = 0;
+		stage_max = MIN(a_extras_cnt, USE_AUTO_EXTRAS) * len;
+
+
+		stage_val_type = STAGE_VAL_NONE;
+
+		orig_hit_cnt = new_hit_cnt;
+
+		for (i = 0; i < len; ++i) {
+
+			u32 last_len = 0;
+
+			stage_cur_byte = i;
+
+			for (j = 0; j < MIN(a_extras_cnt, USE_AUTO_EXTRAS); ++j) {
+
+				/* See the comment in the earlier code; extras are sorted by size. */
+
+				if (a_extras[j].len > len - i ||
+					!memcmp(a_extras[j].data, out_buf + i, a_extras[j].len) ||
+					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, a_extras[j].len))) {
+
+					--stage_max;
+					continue;
+
+				}
+
+				last_len = a_extras[j].len;
+				memcpy(out_buf + i, a_extras[j].data, last_len);
+
+				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
+
+				++stage_cur;
+
+			}
+
+			/* Restore all the clobbered memory. */
+			memcpy(out_buf + i, in_buf + i, last_len);
+
+		}
+
+		new_hit_cnt = queued_paths + unique_crashes;
+
+		stage_finds[STAGE_EXTRAS_AO] += new_hit_cnt - orig_hit_cnt;
+		stage_cycles[STAGE_EXTRAS_AO] += stage_max;
+
+	skip_extras:
+
+		/* If we made this to here without jumping to havoc_stage or abandon_entry,
+		   we're properly done with deterministic steps and can mark it as such
+		   in the .state/ directory. */
+
+		if (!queue_cur->passed_det) mark_as_det_done(queue_cur);
+
+		/****************
+		 * RANDOM HAVOC *
+		 ****************/
+
+	havoc_stage:
+	pacemaker_fuzzing:
+
+
+		stage_cur_byte = -1;
+
+		/* The havoc stage mutation code is also invoked when splicing files; if the
+		   splice_cycle variable is set, generate different descriptions and such. */
+
+		if (!splice_cycle) {
+
+			stage_name = "MOpt-havoc";
+			stage_short = "MOpt_havoc";
+			stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
+				perf_score / havoc_div / 100;
+
+		} else {
+
+			static u8 tmp[32];
+
+			perf_score = orig_perf;
+
+			sprintf(tmp, "MOpt-core-splice %u", splice_cycle);
+			stage_name = tmp;
+			stage_short = "MOpt_core_splice";
+			stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
+
+		}
+
+		s32 temp_len_puppet;
+		cur_ms_lv = get_cur_time();
+
+		//for (; swarm_now < swarm_num; ++swarm_now)
+		{
+			if (key_puppet == 1) {
+				if (unlikely(orig_hit_cnt_puppet == 0)) {
+					orig_hit_cnt_puppet = queued_paths + unique_crashes;
+					last_limit_time_start = get_cur_time();
+					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
+				}
+			}
+			{
+#ifndef IGNORE_FINDS
+			havoc_stage_puppet:
+#endif
+
+				stage_cur_byte = -1;
+
+				/* The havoc stage mutation code is also invoked when splicing files; if the
+				   splice_cycle variable is set, generate different descriptions and such. */
+
+				if (!splice_cycle) {
+					stage_name = "MOpt core avoc";
+					stage_short = "MOpt_core_havoc";
+					stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
+						perf_score / havoc_div / 100;
+				} else {
+					static u8 tmp[32];
+					perf_score = orig_perf;
+					sprintf(tmp, "MOpt core splice %u", splice_cycle);
+					stage_name = tmp;
+					stage_short = "MOpt_core_splice";
+					stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
+				}
+
+				if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
+				temp_len = len;
+				orig_hit_cnt = queued_paths + unique_crashes;
+				havoc_queued = queued_paths;
+
+				for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+					u32 use_stacking = 1 << (1 + UR(HAVOC_STACK_POW2));
+					stage_cur_val = use_stacking;
+
+					for (i = 0; i < operator_num; ++i) {
+						core_operator_cycles_puppet_v3[i] = core_operator_cycles_puppet_v2[i];
+					}
+
+					for (i = 0; i < use_stacking; ++i) {
+
+						switch (select_algorithm()) {
+
+						case 0:
+							/* Flip a single bit somewhere. Spooky! */
+							FLIP_BIT(out_buf, UR(temp_len << 3));
+							core_operator_cycles_puppet_v2[STAGE_FLIP1] += 1;
+							break;
+
+
+						case 1:
+							if (temp_len < 2) break;
+							temp_len_puppet = UR(temp_len << 3);
+							FLIP_BIT(out_buf, temp_len_puppet);
+							FLIP_BIT(out_buf, temp_len_puppet + 1);
+							core_operator_cycles_puppet_v2[STAGE_FLIP2] += 1;
+							break;
+
+						case 2:
+							if (temp_len < 2) break;
+							temp_len_puppet = UR(temp_len << 3);
+							FLIP_BIT(out_buf, temp_len_puppet);
+							FLIP_BIT(out_buf, temp_len_puppet + 1);
+							FLIP_BIT(out_buf, temp_len_puppet + 2);
+							FLIP_BIT(out_buf, temp_len_puppet + 3);
+							core_operator_cycles_puppet_v2[STAGE_FLIP4] += 1;
+							break;
+
+						case 3:
+							if (temp_len < 4) break;
+							out_buf[UR(temp_len)] ^= 0xFF;
+							core_operator_cycles_puppet_v2[STAGE_FLIP8] += 1;
+							break;
+
+						case 4:
+							if (temp_len < 8) break;
+							*(u16*)(out_buf + UR(temp_len - 1)) ^= 0xFFFF;
+							core_operator_cycles_puppet_v2[STAGE_FLIP16] += 1;
+							break;
+
+						case 5:
+							if (temp_len < 8) break;
+							*(u32*)(out_buf + UR(temp_len - 3)) ^= 0xFFFFFFFF;
+							core_operator_cycles_puppet_v2[STAGE_FLIP32] += 1;
+							break;
+
+						case 6:
+							out_buf[UR(temp_len)] -= 1 + UR(ARITH_MAX);
+							out_buf[UR(temp_len)] += 1 + UR(ARITH_MAX);
+							core_operator_cycles_puppet_v2[STAGE_ARITH8] += 1;
+							break;
+
+						case 7:
+							/* Randomly subtract from word, random endian. */
+							if (temp_len < 8) break;
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 1);
+								*(u16*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
+							} else {
+								u32 pos = UR(temp_len - 1);
+								u16 num = 1 + UR(ARITH_MAX);
+								*(u16*)(out_buf + pos) =
+									SWAP16(SWAP16(*(u16*)(out_buf + pos)) - num);
+							}
+							/* Randomly add to word, random endian. */
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 1);
+								*(u16*)(out_buf + pos) += 1 + UR(ARITH_MAX);
+							} else {
+								u32 pos = UR(temp_len - 1);
+								u16 num = 1 + UR(ARITH_MAX);
+								*(u16*)(out_buf + pos) =
+									SWAP16(SWAP16(*(u16*)(out_buf + pos)) + num);
+							}
+							core_operator_cycles_puppet_v2[STAGE_ARITH16] += 1;
+							break;
+
+
+						case 8:
+							/* Randomly subtract from dword, random endian. */
+							if (temp_len < 8) break;
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 3);
+								*(u32*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
+							} else {
+								u32 pos = UR(temp_len - 3);
+								u32 num = 1 + UR(ARITH_MAX);
+								*(u32*)(out_buf + pos) =
+									SWAP32(SWAP32(*(u32*)(out_buf + pos)) - num);
+							}
+							/* Randomly add to dword, random endian. */
+							if (UR(2)) {
+								u32 pos = UR(temp_len - 3);
+								*(u32*)(out_buf + pos) += 1 + UR(ARITH_MAX);
+							} else {
+								u32 pos = UR(temp_len - 3);
+								u32 num = 1 + UR(ARITH_MAX);
+								*(u32*)(out_buf + pos) =
+									SWAP32(SWAP32(*(u32*)(out_buf + pos)) + num);
+							}
+							core_operator_cycles_puppet_v2[STAGE_ARITH32] += 1;
+							break;
+
+
+						case 9:
+							/* Set byte to interesting value. */
+							if (temp_len < 4) break;
+							out_buf[UR(temp_len)] = interesting_8[UR(sizeof(interesting_8))];
+							core_operator_cycles_puppet_v2[STAGE_INTEREST8] += 1;
+							break;
+
+						case 10:
+							/* Set word to interesting value, randomly choosing endian. */
+							if (temp_len < 8) break;
+							if (UR(2)) {
+								*(u16*)(out_buf + UR(temp_len - 1)) =
+									interesting_16[UR(sizeof(interesting_16) >> 1)];
+							} else {
+								*(u16*)(out_buf + UR(temp_len - 1)) = SWAP16(
+									interesting_16[UR(sizeof(interesting_16) >> 1)]);
+							}
+							core_operator_cycles_puppet_v2[STAGE_INTEREST16] += 1;
+							break;
+
+
+						case 11:
+							/* Set dword to interesting value, randomly choosing endian. */
+
+							if (temp_len < 8) break;
+
+							if (UR(2)) {
+								*(u32*)(out_buf + UR(temp_len - 3)) =
+									interesting_32[UR(sizeof(interesting_32) >> 2)];
+							} else {
+								*(u32*)(out_buf + UR(temp_len - 3)) = SWAP32(
+									interesting_32[UR(sizeof(interesting_32) >> 2)]);
+							}
+							core_operator_cycles_puppet_v2[STAGE_INTEREST32] += 1;
+							break;
+
+
+						case 12:
+
+							/* Just set a random byte to a random value. Because,
+							   why not. We use XOR with 1-255 to eliminate the
+							   possibility of a no-op. */
+
+							out_buf[UR(temp_len)] ^= 1 + UR(255);
+							core_operator_cycles_puppet_v2[STAGE_RANDOMBYTE] += 1;
+							break;
+
+
+						case 13: {
+
+							/* Delete bytes. We're making this a bit more likely
+							   than insertion (the next option) in hopes of keeping
+							   files reasonably small. */
+
+							u32 del_from, del_len;
+
+							if (temp_len < 2) break;
+
+							/* Don't delete too much. */
+
+							del_len = choose_block_len(temp_len - 1);
+
+							del_from = UR(temp_len - del_len + 1);
+
+							memmove(out_buf + del_from, out_buf + del_from + del_len,
+								temp_len - del_from - del_len);
+
+							temp_len -= del_len;
+							core_operator_cycles_puppet_v2[STAGE_DELETEBYTE] += 1;
+							break;
+
+						}
+
+						case 14:
+
+							if (temp_len + HAVOC_BLK_XL < MAX_FILE) {
+
+								/* Clone bytes (75%) or insert a block of constant bytes (25%). */
+
+								u8  actually_clone = UR(4);
+								u32 clone_from, clone_to, clone_len;
+								u8* new_buf;
+
+								if (actually_clone) {
+
+									clone_len = choose_block_len(temp_len);
+									clone_from = UR(temp_len - clone_len + 1);
+
+								} else {
+
+									clone_len = choose_block_len(HAVOC_BLK_XL);
+									clone_from = 0;
+
+								}
+
+								clone_to = UR(temp_len);
+
+								new_buf = ck_alloc_nozero(temp_len + clone_len);
+
+								/* Head */
+
+								memcpy(new_buf, out_buf, clone_to);
+
+								/* Inserted part */
+
+								if (actually_clone)
+									memcpy(new_buf + clone_to, out_buf + clone_from, clone_len);
+								else
+									memset(new_buf + clone_to,
+										UR(2) ? UR(256) : out_buf[UR(temp_len)], clone_len);
+
+								/* Tail */
+								memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
+									temp_len - clone_to);
+
+								ck_free(out_buf);
+								out_buf = new_buf;
+								temp_len += clone_len;
+								core_operator_cycles_puppet_v2[STAGE_Clone75] += 1;
+							}
+
+							break;
+
+						case 15: {
+
+							/* Overwrite bytes with a randomly selected chunk (75%) or fixed
+							   bytes (25%). */
+
+							u32 copy_from, copy_to, copy_len;
+
+							if (temp_len < 2) break;
+
+							copy_len = choose_block_len(temp_len - 1);
+
+							copy_from = UR(temp_len - copy_len + 1);
+							copy_to = UR(temp_len - copy_len + 1);
+
+							if (UR(4)) {
+
+								if (copy_from != copy_to)
+									memmove(out_buf + copy_to, out_buf + copy_from, copy_len);
+
+							}
+							else memset(out_buf + copy_to,
+								UR(2) ? UR(256) : out_buf[UR(temp_len)], copy_len);
+							core_operator_cycles_puppet_v2[STAGE_OverWrite75] += 1;
+							break;
+
+						}
+
+
+						}
+
+					}
+
+					tmp_core_time += 1;
+
+					u64 temp_total_found = queued_paths + unique_crashes;
+
+					if (common_fuzz_stuff(argv, out_buf, temp_len))
+						goto abandon_entry_puppet;
+
+					/* out_buf might have been mangled a bit, so let's restore it to its
+					   original size and shape. */
+
+					if (temp_len < len) out_buf = ck_realloc(out_buf, len);
+					temp_len = len;
+					memcpy(out_buf, in_buf, len);
+
+					/* If we're finding new stuff, let's run for a bit longer, limits
+					   permitting. */
+
+					if (queued_paths != havoc_queued) {
+
+						if (perf_score <= havoc_max_mult * 100) {
+							stage_max *= 2;
+							perf_score *= 2;
+						}
+
+						havoc_queued = queued_paths;
+
+					}
+
+					if (unlikely(queued_paths + unique_crashes > temp_total_found))
+					{
+						u64 temp_temp_puppet = queued_paths + unique_crashes - temp_total_found;
+						total_puppet_find = total_puppet_find + temp_temp_puppet;
+						for (i = 0; i < 16; ++i)
+						{
+							if (core_operator_cycles_puppet_v2[i] > core_operator_cycles_puppet_v3[i])
+								core_operator_finds_puppet_v2[i] += temp_temp_puppet;
+						}
+					}
+
+				}
+
+				new_hit_cnt = queued_paths + unique_crashes;
+
+
+#ifndef IGNORE_FINDS
+
+				/************
+				 * SPLICING *
+				 ************/
+
+
+			retry_splicing_puppet:
+
+
+
+				if (use_splicing && splice_cycle++ < SPLICE_CYCLES_puppet &&
+					queued_paths > 1 && queue_cur->len > 1) {
+
+					struct queue_entry* target;
+					u32 tid, split_at;
+					u8* new_buf;
+					s32 f_diff, l_diff;
+
+					/* First of all, if we've modified in_buf for havoc, let's clean that
+					   up... */
+
+					if (in_buf != orig_in) {
+						ck_free(in_buf);
+						in_buf = orig_in;
+						len = queue_cur->len;
+					}
+
+					/* Pick a random queue entry and seek to it. Don't splice with yourself. */
+
+					do { tid = UR(queued_paths); } while (tid == current_entry);
+
+					splicing_with = tid;
+					target = queue;
+
+					while (tid >= 100) { target = target->next_100; tid -= 100; }
+					while (tid--) target = target->next;
+
+					/* Make sure that the target has a reasonable length. */
+
+					while (target && (target->len < 2 || target == queue_cur)) {
+						target = target->next;
+						++splicing_with;
+					}
+
+					if (!target) goto retry_splicing_puppet;
+
+					/* Read the testcase into a new buffer. */
+
+					fd = open(target->fname, O_RDONLY);
+
+					if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
+
+					new_buf = ck_alloc_nozero(target->len);
+
+					ck_read(fd, new_buf, target->len, target->fname);
+
+					close(fd);
+
+					/* Find a suitable splicin g location, somewhere between the first and
+					   the last differing byte. Bail out if the difference is just a single
+					   byte or so. */
+
+					locate_diffs(in_buf, new_buf, MIN(len, target->len), &f_diff, &l_diff);
+
+					if (f_diff < 0 || l_diff < 2 || f_diff == l_diff) {
+						ck_free(new_buf);
+						goto retry_splicing_puppet;
+					}
+
+					/* Split somewhere between the first and last differing byte. */
+
+					split_at = f_diff + UR(l_diff - f_diff);
+
+					/* Do the thing. */
+
+					len = target->len;
+					memcpy(new_buf, in_buf, split_at);
+					in_buf = new_buf;
+					ck_free(out_buf);
+					out_buf = ck_alloc_nozero(len);
+					memcpy(out_buf, in_buf, len);
+
+					goto havoc_stage_puppet;
+
+				}
+
+#endif /* !IGNORE_FINDS */
+
+				ret_val = 0;
+			abandon_entry:
+			abandon_entry_puppet:
+
+				if (splice_cycle >= SPLICE_CYCLES_puppet)
+					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
+
+
+				splicing_with = -1;
+
+
+				munmap(orig_in, queue_cur->len);
+
+				if (in_buf != orig_in) ck_free(in_buf);
+				ck_free(out_buf);
+				ck_free(eff_map);
+
+
+				if (key_puppet == 1)
+				{
+					if (unlikely(queued_paths + unique_crashes > ((queued_paths + unique_crashes)*limit_time_bound + orig_hit_cnt_puppet)))
+					{
+						key_puppet = 0;
+						cur_ms_lv = get_cur_time();
+						new_hit_cnt = queued_paths + unique_crashes;
+						orig_hit_cnt_puppet = 0;
+						last_limit_time_start = 0;
+					}
+				}
+
+
+				if (unlikely(tmp_core_time > period_core))
+				{
+					total_pacemaker_time += tmp_core_time;
+					tmp_core_time = 0;
+					temp_puppet_find = total_puppet_find;
+					new_hit_cnt = queued_paths + unique_crashes;
+
+					u64 temp_stage_finds_puppet = 0;
+					for (i = 0; i < operator_num; ++i)
+					{
+
+						core_operator_finds_puppet[i] = core_operator_finds_puppet_v2[i];
+						core_operator_cycles_puppet[i] = core_operator_cycles_puppet_v2[i];
+						temp_stage_finds_puppet += core_operator_finds_puppet[i];
+					}
+
+					key_module = 2;
+
+					old_hit_count = new_hit_cnt;
+				}
+				return ret_val;
+			}
+		}
+
+
+#undef FLIP_BIT
+
+}
+
+
+void pso_updating(void) {
+
+	g_now += 1;
+	if (g_now > g_max) g_now = 0;
+	w_now = (w_init - w_end)*(g_max - g_now) / (g_max)+w_end;
+	int tmp_swarm, i, j;
+	u64 temp_operator_finds_puppet = 0;
+	for (i = 0; i < operator_num; ++i)
+	{
+		operator_finds_puppet[i] = core_operator_finds_puppet[i];
+
+		for (j = 0; j < swarm_num; ++j)
+		{
+			operator_finds_puppet[i] = operator_finds_puppet[i] + stage_finds_puppet[j][i];
+		}
+		temp_operator_finds_puppet = temp_operator_finds_puppet + operator_finds_puppet[i];
+	}
+
+	for (i = 0; i < operator_num; ++i)
+	{
+		if (operator_finds_puppet[i])
+			G_best[i] = (double)((double)(operator_finds_puppet[i]) / (double)(temp_operator_finds_puppet));
+	}
+
+	for (tmp_swarm = 0; tmp_swarm < swarm_num; ++tmp_swarm)
+	{
+		double x_temp = 0.0;
+		for (i = 0; i < operator_num; ++i)
+		{
+			probability_now[tmp_swarm][i] = 0.0;
+			v_now[tmp_swarm][i] = w_now * v_now[tmp_swarm][i] + RAND_C * (L_best[tmp_swarm][i] - x_now[tmp_swarm][i]) + RAND_C * (G_best[i] - x_now[tmp_swarm][i]);
+			x_now[tmp_swarm][i] += v_now[tmp_swarm][i];
+			if (x_now[tmp_swarm][i] > v_max)
+				x_now[tmp_swarm][i] = v_max;
+			else if (x_now[tmp_swarm][i] < v_min)
+				x_now[tmp_swarm][i] = v_min;
+			x_temp += x_now[tmp_swarm][i];
+		}
+
+		for (i = 0; i < operator_num; ++i)
+		{
+			x_now[tmp_swarm][i] = x_now[tmp_swarm][i] / x_temp;
+			if (likely(i != 0))
+				probability_now[tmp_swarm][i] = probability_now[tmp_swarm][i - 1] + x_now[tmp_swarm][i];
+			else
+				probability_now[tmp_swarm][i] = x_now[tmp_swarm][i];
+		}
+		if (probability_now[tmp_swarm][operator_num - 1] < 0.99 || probability_now[tmp_swarm][operator_num - 1] > 1.01) FATAL("ERROR probability");
+	}
+	swarm_now = 0;
+	key_module = 0;
+}
+
+
+/* larger change for MOpt implementation: the original fuzz_one was renamed
+   to fuzz_one_original. All documentation references to fuzz_one therefore
+   mean fuzz_one_original */
+
+u8 fuzz_one(char** argv) {
+	int key_val_lv = 0;
+	if (limit_time_sig == 0) {
+		key_val_lv = fuzz_one_original(argv);
+	} else {
+		if (key_module == 0)
+			key_val_lv = pilot_fuzzing(argv);
+		else if (key_module == 1)
+			key_val_lv = core_fuzzing(argv);
+		else if (key_module == 2)
+			pso_updating();
+	}
+
+	return key_val_lv;
+}
+
diff --git a/src/afl-fuzz-python.c b/src/afl-fuzz-python.c
index 74ffc524..ed158e6c 100644
--- a/src/afl-fuzz-python.c
+++ b/src/afl-fuzz-python.c
@@ -220,4 +220,110 @@ void trim_py(char** ret, size_t* retlen) {
   }
 }
 
+u8 trim_case_python(char** argv, struct queue_entry* q, u8* in_buf) {
+
+  static u8 tmp[64];
+  static u8 clean_trace[MAP_SIZE];
+
+  u8  needs_write = 0, fault = 0;
+  u32 trim_exec = 0;
+  u32 orig_len = q->len;
+
+  stage_name = tmp;
+  bytes_trim_in += q->len;
+
+  /* Initialize trimming in the Python module */
+  stage_cur = 0;
+  stage_max = init_trim_py(in_buf, q->len);
+
+  if (not_on_tty && debug)
+    SAYF("[Python Trimming] START: Max %d iterations, %u bytes", stage_max, q->len);
+
+  while(stage_cur < stage_max) {
+    sprintf(tmp, "ptrim %s", DI(trim_exec));
+
+    u32 cksum;
+
+    char* retbuf = NULL;
+    size_t retlen = 0;
+
+    trim_py(&retbuf, &retlen);
+
+    if (retlen > orig_len)
+      FATAL("Trimmed data returned by Python module is larger than original data");
+
+    write_to_testcase(retbuf, retlen);
+
+    fault = run_target(argv, exec_tmout);
+    ++trim_execs;
+
+    if (stop_soon || fault == FAULT_ERROR) goto abort_trimming;
+
+    cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+    if (cksum == q->exec_cksum) {
+
+      q->len = retlen;
+      memcpy(in_buf, retbuf, retlen);
+
+      /* Let's save a clean trace, which will be needed by
+         update_bitmap_score once we're done with the trimming stuff. */
+
+      if (!needs_write) {
+
+        needs_write = 1;
+        memcpy(clean_trace, trace_bits, MAP_SIZE);
+
+      }
+
+      /* Tell the Python module that the trimming was successful */
+      stage_cur = post_trim_py(1);
+
+      if (not_on_tty && debug)
+        SAYF("[Python Trimming] SUCCESS: %d/%d iterations (now at %u bytes)", stage_cur, stage_max, q->len);
+    } else {
+      /* Tell the Python module that the trimming was unsuccessful */
+      stage_cur = post_trim_py(0);
+      if (not_on_tty && debug)
+        SAYF("[Python Trimming] FAILURE: %d/%d iterations", stage_cur, stage_max);
+    }
+
+      /* Since this can be slow, update the screen every now and then. */
+
+      if (!(trim_exec++ % stats_update_freq)) show_stats();
+  }
+
+  if (not_on_tty && debug)
+    SAYF("[Python Trimming] DONE: %u bytes -> %u bytes", orig_len, q->len);
+
+  /* If we have made changes to in_buf, we also need to update the on-disk
+     version of the test case. */
+
+  if (needs_write) {
+
+    s32 fd;
+
+    unlink(q->fname); /* ignore errors */
+
+    fd = open(q->fname, O_WRONLY | O_CREAT | O_EXCL, 0600);
+
+    if (fd < 0) PFATAL("Unable to create '%s'", q->fname);
+
+    ck_write(fd, in_buf, q->len, q->fname);
+    close(fd);
+
+    memcpy(trace_bits, clean_trace, MAP_SIZE);
+    update_bitmap_score(q);
+
+  }
+
+
+
+abort_trimming:
+
+  bytes_trim_out += q->len;
+  return fault;
+
+}
+
 #endif /* USE_PYTHON */
diff --git a/src/afl-fuzz-queue.c b/src/afl-fuzz-queue.c
index ed352bcb..c1547b48 100644
--- a/src/afl-fuzz-queue.c
+++ b/src/afl-fuzz-queue.c
@@ -284,3 +284,139 @@ void cull_queue(void) {
 
 }
 
+
+/* Calculate case desirability score to adjust the length of havoc fuzzing.
+   A helper function for fuzz_one(). Maybe some of these constants should
+   go into config.h. */
+
+u32 calculate_score(struct queue_entry* q) {
+
+  u32 avg_exec_us = total_cal_us / total_cal_cycles;
+  u32 avg_bitmap_size = total_bitmap_size / total_bitmap_entries;
+  u32 perf_score = 100;
+
+  /* Adjust score based on execution speed of this path, compared to the
+     global average. Multiplier ranges from 0.1x to 3x. Fast inputs are
+     less expensive to fuzz, so we're giving them more air time. */
+
+  // TODO BUG FIXME: is this really a good idea?
+  // This sounds like looking for lost keys under a street light just because
+  // the light is better there.
+  // Longer execution time means longer work on the input, the deeper in
+  // coverage, the better the fuzzing, right? -mh
+
+  if (q->exec_us * 0.1 > avg_exec_us) perf_score = 10;
+  else if (q->exec_us * 0.25 > avg_exec_us) perf_score = 25;
+  else if (q->exec_us * 0.5 > avg_exec_us) perf_score = 50;
+  else if (q->exec_us * 0.75 > avg_exec_us) perf_score = 75;
+  else if (q->exec_us * 4 < avg_exec_us) perf_score = 300;
+  else if (q->exec_us * 3 < avg_exec_us) perf_score = 200;
+  else if (q->exec_us * 2 < avg_exec_us) perf_score = 150;
+
+  /* Adjust score based on bitmap size. The working theory is that better
+     coverage translates to better targets. Multiplier from 0.25x to 3x. */
+
+  if (q->bitmap_size * 0.3 > avg_bitmap_size) perf_score *= 3;
+  else if (q->bitmap_size * 0.5 > avg_bitmap_size) perf_score *= 2;
+  else if (q->bitmap_size * 0.75 > avg_bitmap_size) perf_score *= 1.5;
+  else if (q->bitmap_size * 3 < avg_bitmap_size) perf_score *= 0.25;
+  else if (q->bitmap_size * 2 < avg_bitmap_size) perf_score *= 0.5;
+  else if (q->bitmap_size * 1.5 < avg_bitmap_size) perf_score *= 0.75;
+
+  /* Adjust score based on handicap. Handicap is proportional to how late
+     in the game we learned about this path. Latecomers are allowed to run
+     for a bit longer until they catch up with the rest. */
+
+  if (q->handicap >= 4) {
+    perf_score *= 4;
+    q->handicap -= 4;
+  } else if (q->handicap) {
+    perf_score *= 2;
+    --q->handicap;
+  }
+
+  /* Final adjustment based on input depth, under the assumption that fuzzing
+     deeper test cases is more likely to reveal stuff that can't be
+     discovered with traditional fuzzers. */
+
+  switch (q->depth) {
+
+    case 0 ... 3:   break;
+    case 4 ... 7:   perf_score *= 2; break;
+    case 8 ... 13:  perf_score *= 3; break;
+    case 14 ... 25: perf_score *= 4; break;
+    default:        perf_score *= 5;
+
+  }
+
+  u64 fuzz = q->n_fuzz;
+  u64 fuzz_total;
+
+  u32 n_paths, fuzz_mu;
+  u32 factor = 1;
+
+  switch (schedule) {
+
+    case EXPLORE:
+      break;
+
+    case EXPLOIT:
+      factor = MAX_FACTOR;
+      break;
+
+    case COE:
+      fuzz_total = 0;
+      n_paths = 0;
+
+      struct queue_entry *queue_it = queue;
+      while (queue_it) {
+        fuzz_total += queue_it->n_fuzz;
+        n_paths ++;
+        queue_it = queue_it->next;
+      }
+
+      fuzz_mu = fuzz_total / n_paths;
+      if (fuzz <= fuzz_mu) {
+        if (q->fuzz_level < 16)
+          factor = ((u32) (1 << q->fuzz_level));
+        else
+          factor = MAX_FACTOR;
+      } else {
+        factor = 0;
+      }
+      break;
+
+    case FAST:
+      if (q->fuzz_level < 16) {
+         factor = ((u32) (1 << q->fuzz_level)) / (fuzz == 0 ? 1 : fuzz);
+      } else
+        factor = MAX_FACTOR / (fuzz == 0 ? 1 : next_p2 (fuzz));
+      break;
+
+    case LIN:
+      factor = q->fuzz_level / (fuzz == 0 ? 1 : fuzz);
+      break;
+
+    case QUAD:
+      factor = q->fuzz_level * q->fuzz_level / (fuzz == 0 ? 1 : fuzz);
+      break;
+
+    default:
+      PFATAL ("Unknown Power Schedule");
+  }
+  if (factor > MAX_FACTOR)
+    factor = MAX_FACTOR;
+
+  perf_score *= factor / POWER_BETA;
+
+  // MOpt mode
+  if (limit_time_sig != 0 && max_depth - q->depth < 3) perf_score *= 2;
+  else if (perf_score < 1) perf_score = 1; // Add a lower bound to AFLFast's energy assignment strategies
+
+  /* Make sure that we don't go over limit. */
+
+  if (perf_score > havoc_max_mult * 100) perf_score = havoc_max_mult * 100;
+
+  return perf_score;
+
+}
diff --git a/src/afl-fuzz-run.c b/src/afl-fuzz-run.c
new file mode 100644
index 00000000..c14ecc87
--- /dev/null
+++ b/src/afl-fuzz-run.c
@@ -0,0 +1,775 @@
+/*
+   american fuzzy lop - fuzzer code
+   --------------------------------
+
+   Written and maintained by Michal Zalewski <lcamtuf@google.com>
+
+   Forkserver design by Jann Horn <jannhorn@googlemail.com>
+
+   Copyright 2013, 2014, 2015, 2016, 2017 Google Inc. All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   This is the real deal: the program takes an instrumented binary and
+   attempts a variety of basic fuzzing tricks, paying close attention to
+   how they affect the execution path.
+
+ */
+
+#include "afl-fuzz.h"
+
+/* Execute target application, monitoring for timeouts. Return status
+   information. The called program will update trace_bits[]. */
+
+u8 run_target(char** argv, u32 timeout) {
+
+  static struct itimerval it;
+  static u32 prev_timed_out = 0;
+  static u64 exec_ms = 0;
+
+  int status = 0;
+  u32 tb4;
+
+  child_timed_out = 0;
+
+  /* After this memset, trace_bits[] are effectively volatile, so we
+     must prevent any earlier operations from venturing into that
+     territory. */
+
+  memset(trace_bits, 0, MAP_SIZE);
+  MEM_BARRIER();
+
+  /* If we're running in "dumb" mode, we can't rely on the fork server
+     logic compiled into the target program, so we will just keep calling
+     execve(). There is a bit of code duplication between here and 
+     init_forkserver(), but c'est la vie. */
+
+  if (dumb_mode == 1 || no_forkserver) {
+
+    child_pid = fork();
+
+    if (child_pid < 0) PFATAL("fork() failed");
+
+    if (!child_pid) {
+
+      struct rlimit r;
+
+      if (mem_limit) {
+
+        r.rlim_max = r.rlim_cur = ((rlim_t)mem_limit) << 20;
+
+#ifdef RLIMIT_AS
+
+        setrlimit(RLIMIT_AS, &r); /* Ignore errors */
+
+#else
+
+        setrlimit(RLIMIT_DATA, &r); /* Ignore errors */
+
+#endif /* ^RLIMIT_AS */
+
+      }
+
+      r.rlim_max = r.rlim_cur = 0;
+
+      setrlimit(RLIMIT_CORE, &r); /* Ignore errors */
+
+      /* Isolate the process and configure standard descriptors. If out_file is
+         specified, stdin is /dev/null; otherwise, out_fd is cloned instead. */
+
+      setsid();
+
+      dup2(dev_null_fd, 1);
+      dup2(dev_null_fd, 2);
+
+      if (out_file) {
+
+        dup2(dev_null_fd, 0);
+
+      } else {
+
+        dup2(out_fd, 0);
+        close(out_fd);
+
+      }
+
+      /* On Linux, would be faster to use O_CLOEXEC. Maybe TODO. */
+
+      close(dev_null_fd);
+      close(out_dir_fd);
+#ifndef HAVE_ARC4RANDOM
+      close(dev_urandom_fd);
+#endif
+      close(fileno(plot_file));
+
+      /* Set sane defaults for ASAN if nothing else specified. */
+
+      setenv("ASAN_OPTIONS", "abort_on_error=1:"
+                             "detect_leaks=0:"
+                             "symbolize=0:"
+                             "allocator_may_return_null=1", 0);
+
+      setenv("MSAN_OPTIONS", "exit_code=" STRINGIFY(MSAN_ERROR) ":"
+                             "symbolize=0:"
+                             "msan_track_origins=0", 0);
+
+      execv(target_path, argv);
+
+      /* Use a distinctive bitmap value to tell the parent about execv()
+         falling through. */
+
+      *(u32*)trace_bits = EXEC_FAIL_SIG;
+      exit(0);
+
+    }
+
+  } else {
+
+    s32 res;
+
+    /* In non-dumb mode, we have the fork server up and running, so simply
+       tell it to have at it, and then read back PID. */
+
+    if ((res = write(fsrv_ctl_fd, &prev_timed_out, 4)) != 4) {
+
+      if (stop_soon) return 0;
+      RPFATAL(res, "Unable to request new process from fork server (OOM?)");
+
+    }
+
+    if ((res = read(fsrv_st_fd, &child_pid, 4)) != 4) {
+
+      if (stop_soon) return 0;
+      RPFATAL(res, "Unable to request new process from fork server (OOM?)");
+
+    }
+
+    if (child_pid <= 0) FATAL("Fork server is misbehaving (OOM?)");
+
+  }
+
+  /* Configure timeout, as requested by user, then wait for child to terminate. */
+
+  it.it_value.tv_sec = (timeout / 1000);
+  it.it_value.tv_usec = (timeout % 1000) * 1000;
+
+  setitimer(ITIMER_REAL, &it, NULL);
+
+  /* The SIGALRM handler simply kills the child_pid and sets child_timed_out. */
+
+  if (dumb_mode == 1 || no_forkserver) {
+
+    if (waitpid(child_pid, &status, 0) <= 0) PFATAL("waitpid() failed");
+
+  } else {
+
+    s32 res;
+
+    if ((res = read(fsrv_st_fd, &status, 4)) != 4) {
+
+      if (stop_soon) return 0;
+      RPFATAL(res, "Unable to communicate with fork server (OOM?)");
+
+    }
+
+  }
+
+  if (!WIFSTOPPED(status)) child_pid = 0;
+  
+  getitimer(ITIMER_REAL, &it);
+  exec_ms = (u64) timeout - (it.it_value.tv_sec * 1000 + it.it_value.tv_usec / 1000);
+  if (slowest_exec_ms < exec_ms) slowest_exec_ms = exec_ms;
+
+  it.it_value.tv_sec = 0;
+  it.it_value.tv_usec = 0;
+
+  setitimer(ITIMER_REAL, &it, NULL);
+
+  ++total_execs;
+
+  /* Any subsequent operations on trace_bits must not be moved by the
+     compiler below this point. Past this location, trace_bits[] behave
+     very normally and do not have to be treated as volatile. */
+
+  MEM_BARRIER();
+
+  tb4 = *(u32*)trace_bits;
+
+#ifdef __x86_64__
+  classify_counts((u64*)trace_bits);
+#else
+  classify_counts((u32*)trace_bits);
+#endif /* ^__x86_64__ */
+
+  prev_timed_out = child_timed_out;
+
+  /* Report outcome to caller. */
+
+  if (WIFSIGNALED(status) && !stop_soon) {
+
+    kill_signal = WTERMSIG(status);
+
+    if (child_timed_out && kill_signal == SIGKILL) return FAULT_TMOUT;
+
+    return FAULT_CRASH;
+
+  }
+
+  /* A somewhat nasty hack for MSAN, which doesn't support abort_on_error and
+     must use a special exit code. */
+
+  if (uses_asan && WEXITSTATUS(status) == MSAN_ERROR) {
+    kill_signal = 0;
+    return FAULT_CRASH;
+  }
+
+  if ((dumb_mode == 1 || no_forkserver) && tb4 == EXEC_FAIL_SIG)
+    return FAULT_ERROR;
+
+  return FAULT_NONE;
+
+}
+
+
+/* Write modified data to file for testing. If out_file is set, the old file
+   is unlinked and a new one is created. Otherwise, out_fd is rewound and
+   truncated. */
+
+void write_to_testcase(void* mem, u32 len) {
+
+  s32 fd = out_fd;
+
+  if (out_file) {
+
+    unlink(out_file); /* Ignore errors. */
+
+    fd = open(out_file, O_WRONLY | O_CREAT | O_EXCL, 0600);
+
+    if (fd < 0) PFATAL("Unable to create '%s'", out_file);
+
+  } else lseek(fd, 0, SEEK_SET);
+
+  if (pre_save_handler) {
+    u8* new_data;
+    size_t new_size = pre_save_handler(mem, len, &new_data);
+    ck_write(fd, new_data, new_size, out_file);
+  } else {
+    ck_write(fd, mem, len, out_file);
+  }
+
+  if (!out_file) {
+
+    if (ftruncate(fd, len)) PFATAL("ftruncate() failed");
+    lseek(fd, 0, SEEK_SET);
+
+  } else close(fd);
+
+}
+
+
+/* The same, but with an adjustable gap. Used for trimming. */
+
+void write_with_gap(void* mem, u32 len, u32 skip_at, u32 skip_len) {
+
+  s32 fd = out_fd;
+  u32 tail_len = len - skip_at - skip_len;
+
+  if (out_file) {
+
+    unlink(out_file); /* Ignore errors. */
+
+    fd = open(out_file, O_WRONLY | O_CREAT | O_EXCL, 0600);
+
+    if (fd < 0) PFATAL("Unable to create '%s'", out_file);
+
+  } else lseek(fd, 0, SEEK_SET);
+
+  if (skip_at) ck_write(fd, mem, skip_at, out_file);
+
+  u8 *memu8 = mem;
+  if (tail_len) ck_write(fd, memu8 + skip_at + skip_len, tail_len, out_file);
+
+  if (!out_file) {
+
+    if (ftruncate(fd, len - skip_len)) PFATAL("ftruncate() failed");
+    lseek(fd, 0, SEEK_SET);
+
+  } else close(fd);
+
+}
+
+
+/* Calibrate a new test case. This is done when processing the input directory
+   to warn about flaky or otherwise problematic test cases early on; and when
+   new paths are discovered to detect variable behavior and so on. */
+
+u8 calibrate_case(char** argv, struct queue_entry* q, u8* use_mem,
+                         u32 handicap, u8 from_queue) {
+
+  static u8 first_trace[MAP_SIZE];
+
+  u8  fault = 0, new_bits = 0, var_detected = 0,
+      first_run = (q->exec_cksum == 0);
+
+  u64 start_us, stop_us;
+
+  s32 old_sc = stage_cur, old_sm = stage_max;
+  u32 use_tmout = exec_tmout;
+  u8* old_sn = stage_name;
+
+  /* Be a bit more generous about timeouts when resuming sessions, or when
+     trying to calibrate already-added finds. This helps avoid trouble due
+     to intermittent latency. */
+
+  if (!from_queue || resuming_fuzz)
+    use_tmout = MAX(exec_tmout + CAL_TMOUT_ADD,
+                    exec_tmout * CAL_TMOUT_PERC / 100);
+
+  ++q->cal_failed;
+
+  stage_name = "calibration";
+  stage_max  = fast_cal ? 3 : CAL_CYCLES;
+
+  /* Make sure the forkserver is up before we do anything, and let's not
+     count its spin-up time toward binary calibration. */
+
+  if (dumb_mode != 1 && !no_forkserver && !forksrv_pid)
+    init_forkserver(argv);
+
+  if (q->exec_cksum) memcpy(first_trace, trace_bits, MAP_SIZE);
+
+  start_us = get_cur_time_us();
+
+  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
+
+    u32 cksum;
+
+    if (!first_run && !(stage_cur % stats_update_freq)) show_stats();
+
+    write_to_testcase(use_mem, q->len);
+
+    fault = run_target(argv, use_tmout);
+
+    /* stop_soon is set by the handler for Ctrl+C. When it's pressed,
+       we want to bail out quickly. */
+
+    if (stop_soon || fault != crash_mode) goto abort_calibration;
+
+    if (!dumb_mode && !stage_cur && !count_bytes(trace_bits)) {
+      fault = FAULT_NOINST;
+      goto abort_calibration;
+    }
+
+    cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+    if (q->exec_cksum != cksum) {
+
+      u8 hnb = has_new_bits(virgin_bits);
+      if (hnb > new_bits) new_bits = hnb;
+
+      if (q->exec_cksum) {
+
+        u32 i;
+
+        for (i = 0; i < MAP_SIZE; ++i) {
+
+          if (!var_bytes[i] && first_trace[i] != trace_bits[i]) {
+
+            var_bytes[i] = 1;
+            stage_max    = CAL_CYCLES_LONG;
+
+          }
+
+        }
+
+        var_detected = 1;
+
+      } else {
+
+        q->exec_cksum = cksum;
+        memcpy(first_trace, trace_bits, MAP_SIZE);
+
+      }
+
+    }
+
+  }
+
+  stop_us = get_cur_time_us();
+
+  total_cal_us     += stop_us - start_us;
+  total_cal_cycles += stage_max;
+
+  /* OK, let's collect some stats about the performance of this test case.
+     This is used for fuzzing air time calculations in calculate_score(). */
+
+  q->exec_us     = (stop_us - start_us) / stage_max;
+  q->bitmap_size = count_bytes(trace_bits);
+  q->handicap    = handicap;
+  q->cal_failed  = 0;
+
+  total_bitmap_size += q->bitmap_size;
+  ++total_bitmap_entries;
+
+  update_bitmap_score(q);
+
+  /* If this case didn't result in new output from the instrumentation, tell
+     parent. This is a non-critical problem, but something to warn the user
+     about. */
+
+  if (!dumb_mode && first_run && !fault && !new_bits) fault = FAULT_NOBITS;
+
+abort_calibration:
+
+  if (new_bits == 2 && !q->has_new_cov) {
+    q->has_new_cov = 1;
+    ++queued_with_cov;
+  }
+
+  /* Mark variable paths. */
+
+  if (var_detected) {
+
+    var_byte_count = count_bytes(var_bytes);
+
+    if (!q->var_behavior) {
+      mark_as_variable(q);
+      ++queued_variable;
+    }
+
+  }
+
+  stage_name = old_sn;
+  stage_cur  = old_sc;
+  stage_max  = old_sm;
+
+  if (!first_run) show_stats();
+
+  return fault;
+
+}
+
+
+/* Grab interesting test cases from other fuzzers. */
+
+void sync_fuzzers(char** argv) {
+
+  DIR* sd;
+  struct dirent* sd_ent;
+  u32 sync_cnt = 0;
+
+  sd = opendir(sync_dir);
+  if (!sd) PFATAL("Unable to open '%s'", sync_dir);
+
+  stage_max = stage_cur = 0;
+  cur_depth = 0;
+
+  /* Look at the entries created for every other fuzzer in the sync directory. */
+
+  while ((sd_ent = readdir(sd))) {
+
+    static u8 stage_tmp[128];
+
+    DIR* qd;
+    struct dirent* qd_ent;
+    u8 *qd_path, *qd_synced_path;
+    u32 min_accept = 0, next_min_accept;
+
+    s32 id_fd;
+
+    /* Skip dot files and our own output directory. */
+
+    if (sd_ent->d_name[0] == '.' || !strcmp(sync_id, sd_ent->d_name)) continue;
+
+    /* Skip anything that doesn't have a queue/ subdirectory. */
+
+    qd_path = alloc_printf("%s/%s/queue", sync_dir, sd_ent->d_name);
+
+    if (!(qd = opendir(qd_path))) {
+      ck_free(qd_path);
+      continue;
+    }
+
+    /* Retrieve the ID of the last seen test case. */
+
+    qd_synced_path = alloc_printf("%s/.synced/%s", out_dir, sd_ent->d_name);
+
+    id_fd = open(qd_synced_path, O_RDWR | O_CREAT, 0600);
+
+    if (id_fd < 0) PFATAL("Unable to create '%s'", qd_synced_path);
+
+    if (read(id_fd, &min_accept, sizeof(u32)) > 0) 
+      lseek(id_fd, 0, SEEK_SET);
+
+    next_min_accept = min_accept;
+
+    /* Show stats */    
+
+    sprintf(stage_tmp, "sync %u", ++sync_cnt);
+    stage_name = stage_tmp;
+    stage_cur  = 0;
+    stage_max  = 0;
+
+    /* For every file queued by this fuzzer, parse ID and see if we have looked at
+       it before; exec a test case if not. */
+
+    while ((qd_ent = readdir(qd))) {
+
+      u8* path;
+      s32 fd;
+      struct stat st;
+
+      if (qd_ent->d_name[0] == '.' ||
+          sscanf(qd_ent->d_name, CASE_PREFIX "%06u", &syncing_case) != 1 || 
+          syncing_case < min_accept) continue;
+
+      /* OK, sounds like a new one. Let's give it a try. */
+
+      if (syncing_case >= next_min_accept)
+        next_min_accept = syncing_case + 1;
+
+      path = alloc_printf("%s/%s", qd_path, qd_ent->d_name);
+
+      /* Allow this to fail in case the other fuzzer is resuming or so... */
+
+      fd = open(path, O_RDONLY);
+
+      if (fd < 0) {
+         ck_free(path);
+         continue;
+      }
+
+      if (fstat(fd, &st)) PFATAL("fstat() failed");
+
+      /* Ignore zero-sized or oversized files. */
+
+      if (st.st_size && st.st_size <= MAX_FILE) {
+
+        u8  fault;
+        u8* mem = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+
+        if (mem == MAP_FAILED) PFATAL("Unable to mmap '%s'", path);
+
+        /* See what happens. We rely on save_if_interesting() to catch major
+           errors and save the test case. */
+
+        write_to_testcase(mem, st.st_size);
+
+        fault = run_target(argv, exec_tmout);
+
+        if (stop_soon) return;
+
+        syncing_party = sd_ent->d_name;
+        queued_imported += save_if_interesting(argv, mem, st.st_size, fault);
+        syncing_party = 0;
+
+        munmap(mem, st.st_size);
+
+        if (!(stage_cur++ % stats_update_freq)) show_stats();
+
+      }
+
+      ck_free(path);
+      close(fd);
+
+    }
+
+    ck_write(id_fd, &next_min_accept, sizeof(u32), qd_synced_path);
+
+    close(id_fd);
+    closedir(qd);
+    ck_free(qd_path);
+    ck_free(qd_synced_path);
+    
+  }  
+
+  closedir(sd);
+
+}
+
+
+/* Trim all new test cases to save cycles when doing deterministic checks. The
+   trimmer uses power-of-two increments somewhere between 1/16 and 1/1024 of
+   file size, to keep the stage short and sweet. */
+
+u8 trim_case(char** argv, struct queue_entry* q, u8* in_buf) {
+
+#ifdef USE_PYTHON
+  if (py_functions[PY_FUNC_TRIM])
+    return trim_case_python(argv, q, in_buf);
+#endif
+
+  static u8 tmp[64];
+  static u8 clean_trace[MAP_SIZE];
+
+  u8  needs_write = 0, fault = 0;
+  u32 trim_exec = 0;
+  u32 remove_len;
+  u32 len_p2;
+
+  /* Although the trimmer will be less useful when variable behavior is
+     detected, it will still work to some extent, so we don't check for
+     this. */
+
+  if (q->len < 5) return 0;
+
+  stage_name = tmp;
+  bytes_trim_in += q->len;
+
+  /* Select initial chunk len, starting with large steps. */
+
+  len_p2 = next_p2(q->len);
+
+  remove_len = MAX(len_p2 / TRIM_START_STEPS, TRIM_MIN_BYTES);
+
+  /* Continue until the number of steps gets too high or the stepover
+     gets too small. */
+
+  while (remove_len >= MAX(len_p2 / TRIM_END_STEPS, TRIM_MIN_BYTES)) {
+
+    u32 remove_pos = remove_len;
+
+    sprintf(tmp, "trim %s/%s", DI(remove_len), DI(remove_len));
+
+    stage_cur = 0;
+    stage_max = q->len / remove_len;
+
+    while (remove_pos < q->len) {
+
+      u32 trim_avail = MIN(remove_len, q->len - remove_pos);
+      u32 cksum;
+
+      write_with_gap(in_buf, q->len, remove_pos, trim_avail);
+
+      fault = run_target(argv, exec_tmout);
+      ++trim_execs;
+
+      if (stop_soon || fault == FAULT_ERROR) goto abort_trimming;
+
+      /* Note that we don't keep track of crashes or hangs here; maybe TODO? */
+
+      cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
+
+      /* If the deletion had no impact on the trace, make it permanent. This
+         isn't perfect for variable-path inputs, but we're just making a
+         best-effort pass, so it's not a big deal if we end up with false
+         negatives every now and then. */
+
+      if (cksum == q->exec_cksum) {
+
+        u32 move_tail = q->len - remove_pos - trim_avail;
+
+        q->len -= trim_avail;
+        len_p2  = next_p2(q->len);
+
+        memmove(in_buf + remove_pos, in_buf + remove_pos + trim_avail, 
+                move_tail);
+
+        /* Let's save a clean trace, which will be needed by
+           update_bitmap_score once we're done with the trimming stuff. */
+
+        if (!needs_write) {
+
+          needs_write = 1;
+          memcpy(clean_trace, trace_bits, MAP_SIZE);
+
+        }
+
+      } else remove_pos += remove_len;
+
+      /* Since this can be slow, update the screen every now and then. */
+
+      if (!(trim_exec++ % stats_update_freq)) show_stats();
+      ++stage_cur;
+
+    }
+
+    remove_len >>= 1;
+
+  }
+
+  /* If we have made changes to in_buf, we also need to update the on-disk
+     version of the test case. */
+
+  if (needs_write) {
+
+    s32 fd;
+
+    unlink(q->fname); /* ignore errors */
+
+    fd = open(q->fname, O_WRONLY | O_CREAT | O_EXCL, 0600);
+
+    if (fd < 0) PFATAL("Unable to create '%s'", q->fname);
+
+    ck_write(fd, in_buf, q->len, q->fname);
+    close(fd);
+
+    memcpy(trace_bits, clean_trace, MAP_SIZE);
+    update_bitmap_score(q);
+
+  }
+
+abort_trimming:
+
+  bytes_trim_out += q->len;
+  return fault;
+
+}
+
+
+/* Write a modified test case, run program, process results. Handle
+   error conditions, returning 1 if it's time to bail out. This is
+   a helper function for fuzz_one(). */
+
+u8 common_fuzz_stuff(char** argv, u8* out_buf, u32 len) {
+
+  u8 fault;
+
+  if (post_handler) {
+
+    out_buf = post_handler(out_buf, &len);
+    if (!out_buf || !len) return 0;
+
+  }
+
+  write_to_testcase(out_buf, len);
+
+  fault = run_target(argv, exec_tmout);
+
+  if (stop_soon) return 1;
+
+  if (fault == FAULT_TMOUT) {
+
+    if (subseq_tmouts++ > TMOUT_LIMIT) {
+      ++cur_skipped_paths;
+      return 1;
+    }
+
+  } else subseq_tmouts = 0;
+
+  /* Users can hit us with SIGUSR1 to request the current input
+     to be abandoned. */
+
+  if (skip_requested) {
+
+     skip_requested = 0;
+     ++cur_skipped_paths;
+     return 1;
+
+  }
+
+  /* This handles FAULT_ERROR for us: */
+
+  queued_discovered += save_if_interesting(argv, out_buf, len, fault);
+
+  if (!(stage_cur % stats_update_freq) || stage_cur + 1 == stage_max)
+    show_stats();
+
+  return 0;
+
+}
+
diff --git a/src/afl-fuzz-stats.c b/src/afl-fuzz-stats.c
new file mode 100644
index 00000000..5dbd59ac
--- /dev/null
+++ b/src/afl-fuzz-stats.c
@@ -0,0 +1,754 @@
+/*
+   american fuzzy lop - fuzzer code
+   --------------------------------
+
+   Written and maintained by Michal Zalewski <lcamtuf@google.com>
+
+   Forkserver design by Jann Horn <jannhorn@googlemail.com>
+
+   Copyright 2013, 2014, 2015, 2016, 2017 Google Inc. All rights reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at:
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   This is the real deal: the program takes an instrumented binary and
+   attempts a variety of basic fuzzing tricks, paying close attention to
+   how they affect the execution path.
+
+ */
+
+#include "afl-fuzz.h"
+
+/* Update stats file for unattended monitoring. */
+
+void write_stats_file(double bitmap_cvg, double stability, double eps) {
+
+  static double last_bcvg, last_stab, last_eps;
+  static struct rusage usage;
+
+  u8* fn = alloc_printf("%s/fuzzer_stats", out_dir);
+  s32 fd;
+  FILE* f;
+
+  fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+
+  if (fd < 0) PFATAL("Unable to create '%s'", fn);
+
+  ck_free(fn);
+
+  f = fdopen(fd, "w");
+
+  if (!f) PFATAL("fdopen() failed");
+
+  /* Keep last values in case we're called from another context
+     where exec/sec stats and such are not readily available. */
+
+  if (!bitmap_cvg && !stability && !eps) {
+    bitmap_cvg = last_bcvg;
+    stability  = last_stab;
+    eps        = last_eps;
+  } else {
+    last_bcvg = bitmap_cvg;
+    last_stab = stability;
+    last_eps  = eps;
+  }
+
+  fprintf(f, "start_time        : %llu\n"
+             "last_update       : %llu\n"
+             "fuzzer_pid        : %d\n"
+             "cycles_done       : %llu\n"
+             "execs_done        : %llu\n"
+             "execs_per_sec     : %0.02f\n"
+             "paths_total       : %u\n"
+             "paths_favored     : %u\n"
+             "paths_found       : %u\n"
+             "paths_imported    : %u\n"
+             "max_depth         : %u\n"
+             "cur_path          : %u\n" /* Must match find_start_position() */
+             "pending_favs      : %u\n"
+             "pending_total     : %u\n"
+             "variable_paths    : %u\n"
+             "stability         : %0.02f%%\n"
+             "bitmap_cvg        : %0.02f%%\n"
+             "unique_crashes    : %llu\n"
+             "unique_hangs      : %llu\n"
+             "last_path         : %llu\n"
+             "last_crash        : %llu\n"
+             "last_hang         : %llu\n"
+             "execs_since_crash : %llu\n"
+             "exec_timeout      : %u\n"
+             "slowest_exec_ms   : %llu\n"
+             "peak_rss_mb       : %lu\n"
+             "afl_banner        : %s\n"
+             "afl_version       : " VERSION "\n"
+             "target_mode       : %s%s%s%s%s%s%s%s\n"
+             "command_line      : %s\n",
+             start_time / 1000, get_cur_time() / 1000, getpid(),
+             queue_cycle ? (queue_cycle - 1) : 0, total_execs, eps,
+             queued_paths, queued_favored, queued_discovered, queued_imported,
+             max_depth, current_entry, pending_favored, pending_not_fuzzed,
+             queued_variable, stability, bitmap_cvg, unique_crashes,
+             unique_hangs, last_path_time / 1000, last_crash_time / 1000,
+             last_hang_time / 1000, total_execs - last_crash_execs,
+             exec_tmout, slowest_exec_ms, (unsigned long int)usage.ru_maxrss, use_banner,
+             unicorn_mode ? "unicorn" : "", qemu_mode ? "qemu " : "", dumb_mode ? " dumb " : "",
+             no_forkserver ? "no_forksrv " : "", crash_mode ? "crash " : "",
+             persistent_mode ? "persistent " : "", deferred_mode ? "deferred " : "",
+             (unicorn_mode || qemu_mode || dumb_mode || no_forkserver || crash_mode ||
+              persistent_mode || deferred_mode) ? "" : "default",
+             orig_cmdline);
+             /* ignore errors */
+
+  fclose(f);
+
+}
+
+
+/* Update the plot file if there is a reason to. */
+
+void maybe_update_plot_file(double bitmap_cvg, double eps) {
+
+  static u32 prev_qp, prev_pf, prev_pnf, prev_ce, prev_md;
+  static u64 prev_qc, prev_uc, prev_uh;
+
+  if (prev_qp == queued_paths && prev_pf == pending_favored && 
+      prev_pnf == pending_not_fuzzed && prev_ce == current_entry &&
+      prev_qc == queue_cycle && prev_uc == unique_crashes &&
+      prev_uh == unique_hangs && prev_md == max_depth) return;
+
+  prev_qp  = queued_paths;
+  prev_pf  = pending_favored;
+  prev_pnf = pending_not_fuzzed;
+  prev_ce  = current_entry;
+  prev_qc  = queue_cycle;
+  prev_uc  = unique_crashes;
+  prev_uh  = unique_hangs;
+  prev_md  = max_depth;
+
+  /* Fields in the file:
+
+     unix_time, cycles_done, cur_path, paths_total, paths_not_fuzzed,
+     favored_not_fuzzed, unique_crashes, unique_hangs, max_depth,
+     execs_per_sec */
+
+  fprintf(plot_file, 
+          "%llu, %llu, %u, %u, %u, %u, %0.02f%%, %llu, %llu, %u, %0.02f\n",
+          get_cur_time() / 1000, queue_cycle - 1, current_entry, queued_paths,
+          pending_not_fuzzed, pending_favored, bitmap_cvg, unique_crashes,
+          unique_hangs, max_depth, eps); /* ignore errors */
+
+  fflush(plot_file);
+
+}
+
+
+/* Check terminal dimensions after resize. */
+
+static void check_term_size(void) {
+
+  struct winsize ws;
+
+  term_too_small = 0;
+
+  if (ioctl(1, TIOCGWINSZ, &ws)) return;
+
+  if (ws.ws_row == 0 || ws.ws_col == 0) return;
+  if (ws.ws_row < 24 || ws.ws_col < 79) term_too_small = 1;
+
+}
+
+
+/* A spiffy retro stats screen! This is called every stats_update_freq
+   execve() calls, plus in several other circumstances. */
+
+void show_stats(void) {
+
+  static u64 last_stats_ms, last_plot_ms, last_ms, last_execs;
+  static double avg_exec;
+  double t_byte_ratio, stab_ratio;
+
+  u64 cur_ms;
+  u32 t_bytes, t_bits;
+
+  u32 banner_len, banner_pad;
+  u8  tmp[256];
+
+  cur_ms = get_cur_time();
+
+  /* If not enough time has passed since last UI update, bail out. */
+
+  if (cur_ms - last_ms < 1000 / UI_TARGET_HZ) return;
+
+  /* Check if we're past the 10 minute mark. */
+
+  if (cur_ms - start_time > 10 * 60 * 1000) run_over10m = 1;
+
+  /* Calculate smoothed exec speed stats. */
+
+  if (!last_execs) {
+
+    avg_exec = ((double)total_execs) * 1000 / (cur_ms - start_time);
+
+  } else {
+
+    double cur_avg = ((double)(total_execs - last_execs)) * 1000 /
+                     (cur_ms - last_ms);
+
+    /* If there is a dramatic (5x+) jump in speed, reset the indicator
+       more quickly. */
+
+    if (cur_avg * 5 < avg_exec || cur_avg / 5 > avg_exec)
+      avg_exec = cur_avg;
+
+    avg_exec = avg_exec * (1.0 - 1.0 / AVG_SMOOTHING) +
+               cur_avg * (1.0 / AVG_SMOOTHING);
+
+  }
+
+  last_ms = cur_ms;
+  last_execs = total_execs;
+
+  /* Tell the callers when to contact us (as measured in execs). */
+
+  stats_update_freq = avg_exec / (UI_TARGET_HZ * 10);
+  if (!stats_update_freq) stats_update_freq = 1;
+
+  /* Do some bitmap stats. */
+
+  t_bytes = count_non_255_bytes(virgin_bits);
+  t_byte_ratio = ((double)t_bytes * 100) / MAP_SIZE;
+
+  if (t_bytes)
+    stab_ratio = 100 - ((double)var_byte_count) * 100 / t_bytes;
+  else
+    stab_ratio = 100;
+
+  /* Roughly every minute, update fuzzer stats and save auto tokens. */
+
+  if (cur_ms - last_stats_ms > STATS_UPDATE_SEC * 1000) {
+
+    last_stats_ms = cur_ms;
+    write_stats_file(t_byte_ratio, stab_ratio, avg_exec);
+    save_auto();
+    write_bitmap();
+
+  }
+
+  /* Every now and then, write plot data. */
+
+  if (cur_ms - last_plot_ms > PLOT_UPDATE_SEC * 1000) {
+
+    last_plot_ms = cur_ms;
+    maybe_update_plot_file(t_byte_ratio, avg_exec);
+
+  }
+
+  /* Honor AFL_EXIT_WHEN_DONE and AFL_BENCH_UNTIL_CRASH. */
+
+  if (!dumb_mode && cycles_wo_finds > 100 && !pending_not_fuzzed &&
+      getenv("AFL_EXIT_WHEN_DONE")) stop_soon = 2;
+
+  if (total_crashes && getenv("AFL_BENCH_UNTIL_CRASH")) stop_soon = 2;
+
+  /* If we're not on TTY, bail out. */
+
+  if (not_on_tty) return;
+
+  /* Compute some mildly useful bitmap stats. */
+
+  t_bits = (MAP_SIZE << 3) - count_bits(virgin_bits);
+
+  /* Now, for the visuals... */
+
+  if (clear_screen) {
+
+    SAYF(TERM_CLEAR CURSOR_HIDE);
+    clear_screen = 0;
+
+    check_term_size();
+
+  }
+
+  SAYF(TERM_HOME);
+
+  if (term_too_small) {
+
+    SAYF(cBRI "Your terminal is too small to display the UI.\n"
+         "Please resize terminal window to at least 79x24.\n" cRST);
+
+    return;
+
+  }
+
+  /* Let's start by drawing a centered banner. */
+
+  banner_len = (crash_mode ? 24 : 22) + strlen(VERSION) + strlen(use_banner) + strlen(power_name) + 3 + 5;
+  banner_pad = (79 - banner_len) / 2;
+  memset(tmp, ' ', banner_pad);
+
+#ifdef HAVE_AFFINITY
+  sprintf(tmp + banner_pad, "%s " cLCY VERSION cLGN
+          " (%s) " cPIN "[%s]" cBLU " {%d}",  crash_mode ? cPIN "peruvian were-rabbit" :
+          cYEL "american fuzzy lop", use_banner, power_name, cpu_aff);
+#else
+  sprintf(tmp + banner_pad, "%s " cLCY VERSION cLGN
+          " (%s) " cPIN "[%s]",  crash_mode ? cPIN "peruvian were-rabbit" :
+          cYEL "american fuzzy lop", use_banner, power_name);
+#endif /* HAVE_AFFINITY */
+
+  SAYF("\n%s\n", tmp);
+
+  /* "Handy" shortcuts for drawing boxes... */
+
+#define bSTG    bSTART cGRA
+#define bH2     bH bH
+#define bH5     bH2 bH2 bH
+#define bH10    bH5 bH5
+#define bH20    bH10 bH10
+#define bH30    bH20 bH10
+#define SP5     "     "
+#define SP10    SP5 SP5
+#define SP20    SP10 SP10
+
+  /* Lord, forgive me this. */
+
+  SAYF(SET_G1 bSTG bLT bH bSTOP cCYA " process timing " bSTG bH30 bH5 bH bHB
+       bH bSTOP cCYA " overall results " bSTG bH2 bH2 bRT "\n");
+
+  if (dumb_mode) {
+
+    strcpy(tmp, cRST);
+
+  } else {
+
+    u64 min_wo_finds = (cur_ms - last_path_time) / 1000 / 60;
+
+    /* First queue cycle: don't stop now! */
+    if (queue_cycle == 1 || min_wo_finds < 15) strcpy(tmp, cMGN); else
+
+    /* Subsequent cycles, but we're still making finds. */
+    if (cycles_wo_finds < 25 || min_wo_finds < 30) strcpy(tmp, cYEL); else
+
+    /* No finds for a long time and no test cases to try. */
+    if (cycles_wo_finds > 100 && !pending_not_fuzzed && min_wo_finds > 120)
+      strcpy(tmp, cLGN);
+
+    /* Default: cautiously OK to stop? */
+    else strcpy(tmp, cLBL);
+
+  }
+
+  SAYF(bV bSTOP "        run time : " cRST "%-33s " bSTG bV bSTOP
+       "  cycles done : %s%-5s " bSTG bV "\n",
+       DTD(cur_ms, start_time), tmp, DI(queue_cycle - 1));
+
+  /* We want to warn people about not seeing new paths after a full cycle,
+     except when resuming fuzzing or running in non-instrumented mode. */
+
+  if (!dumb_mode && (last_path_time || resuming_fuzz || queue_cycle == 1 ||
+      in_bitmap || crash_mode)) {
+
+    SAYF(bV bSTOP "   last new path : " cRST "%-33s ",
+         DTD(cur_ms, last_path_time));
+
+  } else {
+
+    if (dumb_mode)
+
+      SAYF(bV bSTOP "   last new path : " cPIN "n/a" cRST
+           " (non-instrumented mode)       ");
+
+     else
+
+      SAYF(bV bSTOP "   last new path : " cRST "none yet " cLRD
+           "(odd, check syntax!)     ");
+
+  }
+
+  SAYF(bSTG bV bSTOP "  total paths : " cRST "%-5s " bSTG bV "\n",
+       DI(queued_paths));
+
+  /* Highlight crashes in red if found, denote going over the KEEP_UNIQUE_CRASH
+     limit with a '+' appended to the count. */
+
+  sprintf(tmp, "%s%s", DI(unique_crashes),
+          (unique_crashes >= KEEP_UNIQUE_CRASH) ? "+" : "");
+
+  SAYF(bV bSTOP " last uniq crash : " cRST "%-33s " bSTG bV bSTOP
+       " uniq crashes : %s%-6s" bSTG bV "\n",
+       DTD(cur_ms, last_crash_time), unique_crashes ? cLRD : cRST,
+       tmp);
+
+  sprintf(tmp, "%s%s", DI(unique_hangs),
+         (unique_hangs >= KEEP_UNIQUE_HANG) ? "+" : "");
+
+  SAYF(bV bSTOP "  last uniq hang : " cRST "%-33s " bSTG bV bSTOP
+       "   uniq hangs : " cRST "%-6s" bSTG bV "\n",
+       DTD(cur_ms, last_hang_time), tmp);
+
+  SAYF(bVR bH bSTOP cCYA " cycle progress " bSTG bH10 bH5 bH2 bH2 bHB bH bSTOP cCYA
+       " map coverage " bSTG bH bHT bH20 bH2 bVL "\n");
+
+  /* This gets funny because we want to print several variable-length variables
+     together, but then cram them into a fixed-width field - so we need to
+     put them in a temporary buffer first. */
+
+  sprintf(tmp, "%s%s%u (%0.02f%%)", DI(current_entry),
+          queue_cur->favored ? "." : "*", queue_cur->fuzz_level,
+          ((double)current_entry * 100) / queued_paths);
+
+  SAYF(bV bSTOP "  now processing : " cRST "%-16s " bSTG bV bSTOP, tmp);
+
+  sprintf(tmp, "%0.02f%% / %0.02f%%", ((double)queue_cur->bitmap_size) *
+          100 / MAP_SIZE, t_byte_ratio);
+
+  SAYF("    map density : %s%-21s" bSTG bV "\n", t_byte_ratio > 70 ? cLRD :
+       ((t_bytes < 200 && !dumb_mode) ? cPIN : cRST), tmp);
+
+  sprintf(tmp, "%s (%0.02f%%)", DI(cur_skipped_paths),
+          ((double)cur_skipped_paths * 100) / queued_paths);
+
+  SAYF(bV bSTOP " paths timed out : " cRST "%-16s " bSTG bV, tmp);
+
+  sprintf(tmp, "%0.02f bits/tuple",
+          t_bytes ? (((double)t_bits) / t_bytes) : 0);
+
+  SAYF(bSTOP " count coverage : " cRST "%-21s" bSTG bV "\n", tmp);
+
+  SAYF(bVR bH bSTOP cCYA " stage progress " bSTG bH10 bH5 bH2 bH2 bX bH bSTOP cCYA
+       " findings in depth " bSTG bH10 bH5 bH2 bH2 bVL "\n");
+
+  sprintf(tmp, "%s (%0.02f%%)", DI(queued_favored),
+          ((double)queued_favored) * 100 / queued_paths);
+
+  /* Yeah... it's still going on... halp? */
+
+  SAYF(bV bSTOP "  now trying : " cRST "%-20s " bSTG bV bSTOP
+       " favored paths : " cRST "%-22s" bSTG bV "\n", stage_name, tmp);
+
+  if (!stage_max) {
+
+    sprintf(tmp, "%s/-", DI(stage_cur));
+
+  } else {
+
+    sprintf(tmp, "%s/%s (%0.02f%%)", DI(stage_cur), DI(stage_max),
+            ((double)stage_cur) * 100 / stage_max);
+
+  }
+
+  SAYF(bV bSTOP " stage execs : " cRST "%-20s " bSTG bV bSTOP, tmp);
+
+  sprintf(tmp, "%s (%0.02f%%)", DI(queued_with_cov),
+          ((double)queued_with_cov) * 100 / queued_paths);
+
+  SAYF("  new edges on : " cRST "%-22s" bSTG bV "\n", tmp);
+
+  sprintf(tmp, "%s (%s%s unique)", DI(total_crashes), DI(unique_crashes),
+          (unique_crashes >= KEEP_UNIQUE_CRASH) ? "+" : "");
+
+  if (crash_mode) {
+
+    SAYF(bV bSTOP " total execs : " cRST "%-20s " bSTG bV bSTOP
+         "   new crashes : %s%-22s" bSTG bV "\n", DI(total_execs),
+         unique_crashes ? cLRD : cRST, tmp);
+
+  } else {
+
+    SAYF(bV bSTOP " total execs : " cRST "%-20s " bSTG bV bSTOP
+         " total crashes : %s%-22s" bSTG bV "\n", DI(total_execs),
+         unique_crashes ? cLRD : cRST, tmp);
+
+  }
+
+  /* Show a warning about slow execution. */
+
+  if (avg_exec < 100) {
+
+    sprintf(tmp, "%s/sec (%s)", DF(avg_exec), avg_exec < 20 ?
+            "zzzz..." : "slow!");
+
+    SAYF(bV bSTOP "  exec speed : " cLRD "%-20s ", tmp);
+
+  } else {
+
+    sprintf(tmp, "%s/sec", DF(avg_exec));
+    SAYF(bV bSTOP "  exec speed : " cRST "%-20s ", tmp);
+
+  }
+
+  sprintf(tmp, "%s (%s%s unique)", DI(total_tmouts), DI(unique_tmouts),
+          (unique_hangs >= KEEP_UNIQUE_HANG) ? "+" : "");
+
+  SAYF (bSTG bV bSTOP "  total tmouts : " cRST "%-22s" bSTG bV "\n", tmp);
+
+  /* Aaaalmost there... hold on! */
+
+  SAYF(bVR bH cCYA bSTOP " fuzzing strategy yields " bSTG bH10 bHT bH10
+       bH5 bHB bH bSTOP cCYA " path geometry " bSTG bH5 bH2 bVL "\n");
+
+  if (skip_deterministic) {
+
+    strcpy(tmp, "n/a, n/a, n/a");
+
+  } else {
+
+    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
+            DI(stage_finds[STAGE_FLIP1]), DI(stage_cycles[STAGE_FLIP1]),
+            DI(stage_finds[STAGE_FLIP2]), DI(stage_cycles[STAGE_FLIP2]),
+            DI(stage_finds[STAGE_FLIP4]), DI(stage_cycles[STAGE_FLIP4]));
+
+  }
+
+  SAYF(bV bSTOP "   bit flips : " cRST "%-36s " bSTG bV bSTOP "    levels : "
+       cRST "%-10s" bSTG bV "\n", tmp, DI(max_depth));
+
+  if (!skip_deterministic)
+    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
+            DI(stage_finds[STAGE_FLIP8]), DI(stage_cycles[STAGE_FLIP8]),
+            DI(stage_finds[STAGE_FLIP16]), DI(stage_cycles[STAGE_FLIP16]),
+            DI(stage_finds[STAGE_FLIP32]), DI(stage_cycles[STAGE_FLIP32]));
+
+  SAYF(bV bSTOP "  byte flips : " cRST "%-36s " bSTG bV bSTOP "   pending : "
+       cRST "%-10s" bSTG bV "\n", tmp, DI(pending_not_fuzzed));
+
+  if (!skip_deterministic)
+    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
+            DI(stage_finds[STAGE_ARITH8]), DI(stage_cycles[STAGE_ARITH8]),
+            DI(stage_finds[STAGE_ARITH16]), DI(stage_cycles[STAGE_ARITH16]),
+            DI(stage_finds[STAGE_ARITH32]), DI(stage_cycles[STAGE_ARITH32]));
+
+  SAYF(bV bSTOP " arithmetics : " cRST "%-36s " bSTG bV bSTOP "  pend fav : "
+       cRST "%-10s" bSTG bV "\n", tmp, DI(pending_favored));
+
+  if (!skip_deterministic)
+    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
+            DI(stage_finds[STAGE_INTEREST8]), DI(stage_cycles[STAGE_INTEREST8]),
+            DI(stage_finds[STAGE_INTEREST16]), DI(stage_cycles[STAGE_INTEREST16]),
+            DI(stage_finds[STAGE_INTEREST32]), DI(stage_cycles[STAGE_INTEREST32]));
+
+  SAYF(bV bSTOP "  known ints : " cRST "%-36s " bSTG bV bSTOP " own finds : "
+       cRST "%-10s" bSTG bV "\n", tmp, DI(queued_discovered));
+
+  if (!skip_deterministic)
+    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
+            DI(stage_finds[STAGE_EXTRAS_UO]), DI(stage_cycles[STAGE_EXTRAS_UO]),
+            DI(stage_finds[STAGE_EXTRAS_UI]), DI(stage_cycles[STAGE_EXTRAS_UI]),
+            DI(stage_finds[STAGE_EXTRAS_AO]), DI(stage_cycles[STAGE_EXTRAS_AO]));
+
+  SAYF(bV bSTOP "  dictionary : " cRST "%-36s " bSTG bV bSTOP
+       "  imported : " cRST "%-10s" bSTG bV "\n", tmp,
+       sync_id ? DI(queued_imported) : (u8*)"n/a");
+
+  sprintf(tmp, "%s/%s, %s/%s, %s/%s",
+          DI(stage_finds[STAGE_HAVOC]), DI(stage_cycles[STAGE_HAVOC]),
+          DI(stage_finds[STAGE_SPLICE]), DI(stage_cycles[STAGE_SPLICE]),
+          DI(stage_finds[STAGE_PYTHON]), DI(stage_cycles[STAGE_PYTHON]));
+
+  SAYF(bV bSTOP "       havoc : " cRST "%-36s " bSTG bV bSTOP, tmp);
+
+  if (t_bytes) sprintf(tmp, "%0.02f%%", stab_ratio);
+    else strcpy(tmp, "n/a");
+
+  SAYF(" stability : %s%-10s" bSTG bV "\n", (stab_ratio < 85 && var_byte_count > 40)
+       ? cLRD : ((queued_variable && (!persistent_mode || var_byte_count > 20))
+       ? cMGN : cRST), tmp);
+
+  if (!bytes_trim_out) {
+
+    sprintf(tmp, "n/a, ");
+
+  } else {
+
+    sprintf(tmp, "%0.02f%%/%s, ",
+            ((double)(bytes_trim_in - bytes_trim_out)) * 100 / bytes_trim_in,
+            DI(trim_execs));
+
+  }
+
+  if (!blocks_eff_total) {
+
+    u8 tmp2[128];
+
+    sprintf(tmp2, "n/a");
+    strcat(tmp, tmp2);
+
+  } else {
+
+    u8 tmp2[128];
+
+    sprintf(tmp2, "%0.02f%%",
+            ((double)(blocks_eff_total - blocks_eff_select)) * 100 /
+            blocks_eff_total);
+
+    strcat(tmp, tmp2);
+
+  }
+  if (custom_mutator) {
+    sprintf(tmp, "%s/%s", DI(stage_finds[STAGE_CUSTOM_MUTATOR]), DI(stage_cycles[STAGE_CUSTOM_MUTATOR]));
+    SAYF(bV bSTOP " custom mut. : " cRST "%-36s " bSTG bVR bH20 bH2 bH bRB "\n"
+             bLB bH30 bH20 bH2 bH bRB bSTOP cRST RESET_G1, tmp);
+  } else {
+    SAYF(bV bSTOP "        trim : " cRST "%-36s " bSTG bVR bH20 bH2 bH bRB "\n"
+       bLB bH30 bH20 bH2 bRB bSTOP cRST RESET_G1, tmp);
+  }
+
+  /* Provide some CPU utilization stats. */
+
+  if (cpu_core_count) {
+
+    double cur_runnable = get_runnable_processes();
+    u32 cur_utilization = cur_runnable * 100 / cpu_core_count;
+
+    u8* cpu_color = cCYA;
+
+    /* If we could still run one or more processes, use green. */
+
+    if (cpu_core_count > 1 && cur_runnable + 1 <= cpu_core_count)
+      cpu_color = cLGN;
+
+    /* If we're clearly oversubscribed, use red. */
+
+    if (!no_cpu_meter_red && cur_utilization >= 150) cpu_color = cLRD;
+
+#ifdef HAVE_AFFINITY
+
+    if (cpu_aff >= 0) {
+
+      SAYF(SP10 cGRA "[cpu%03u:%s%3u%%" cGRA "]\r" cRST, 
+           MIN(cpu_aff, 999), cpu_color,
+           MIN(cur_utilization, 999));
+
+    } else {
+
+      SAYF(SP10 cGRA "   [cpu:%s%3u%%" cGRA "]\r" cRST,
+           cpu_color, MIN(cur_utilization, 999));
+ 
+   }
+
+#else
+
+    SAYF(SP10 cGRA "   [cpu:%s%3u%%" cGRA "]\r" cRST,
+         cpu_color, MIN(cur_utilization, 999));
+
+#endif /* ^HAVE_AFFINITY */
+
+  } else SAYF("\r");
+
+  /* Hallelujah! */
+
+  fflush(0);
+
+}
+
+
+/* Display quick statistics at the end of processing the input directory,
+   plus a bunch of warnings. Some calibration stuff also ended up here,
+   along with several hardcoded constants. Maybe clean up eventually. */
+
+void show_init_stats(void) {
+
+  struct queue_entry* q = queue;
+  u32 min_bits = 0, max_bits = 0;
+  u64 min_us = 0, max_us = 0;
+  u64 avg_us = 0;
+  u32 max_len = 0;
+
+  if (total_cal_cycles) avg_us = total_cal_us / total_cal_cycles;
+
+  while (q) {
+
+    if (!min_us || q->exec_us < min_us) min_us = q->exec_us;
+    if (q->exec_us > max_us) max_us = q->exec_us;
+
+    if (!min_bits || q->bitmap_size < min_bits) min_bits = q->bitmap_size;
+    if (q->bitmap_size > max_bits) max_bits = q->bitmap_size;
+
+    if (q->len > max_len) max_len = q->len;
+
+    q = q->next;
+
+  }
+
+  SAYF("\n");
+
+  if (avg_us > ((qemu_mode || unicorn_mode) ? 50000 : 10000))
+    WARNF(cLRD "The target binary is pretty slow! See %s/perf_tips.txt.",
+          doc_path);
+
+  /* Let's keep things moving with slow binaries. */
+
+  if (avg_us > 50000) havoc_div = 10;     /* 0-19 execs/sec   */
+  else if (avg_us > 20000) havoc_div = 5; /* 20-49 execs/sec  */
+  else if (avg_us > 10000) havoc_div = 2; /* 50-100 execs/sec */
+
+  if (!resuming_fuzz) {
+
+    if (max_len > 50 * 1024)
+      WARNF(cLRD "Some test cases are huge (%s) - see %s/perf_tips.txt!",
+            DMS(max_len), doc_path);
+    else if (max_len > 10 * 1024)
+      WARNF("Some test cases are big (%s) - see %s/perf_tips.txt.",
+            DMS(max_len), doc_path);
+
+    if (useless_at_start && !in_bitmap)
+      WARNF(cLRD "Some test cases look useless. Consider using a smaller set.");
+
+    if (queued_paths > 100)
+      WARNF(cLRD "You probably have far too many input files! Consider trimming down.");
+    else if (queued_paths > 20)
+      WARNF("You have lots of input files; try starting small.");
+
+  }
+
+  OKF("Here are some useful stats:\n\n"
+
+      cGRA "    Test case count : " cRST "%u favored, %u variable, %u total\n"
+      cGRA "       Bitmap range : " cRST "%u to %u bits (average: %0.02f bits)\n"
+      cGRA "        Exec timing : " cRST "%s to %s us (average: %s us)\n",
+      queued_favored, queued_variable, queued_paths, min_bits, max_bits, 
+      ((double)total_bitmap_size) / (total_bitmap_entries ? total_bitmap_entries : 1),
+      DI(min_us), DI(max_us), DI(avg_us));
+
+  if (!timeout_given) {
+
+    /* Figure out the appropriate timeout. The basic idea is: 5x average or
+       1x max, rounded up to EXEC_TM_ROUND ms and capped at 1 second.
+
+       If the program is slow, the multiplier is lowered to 2x or 3x, because
+       random scheduler jitter is less likely to have any impact, and because
+       our patience is wearing thin =) */
+
+    if (avg_us > 50000) exec_tmout = avg_us * 2 / 1000;
+    else if (avg_us > 10000) exec_tmout = avg_us * 3 / 1000;
+    else exec_tmout = avg_us * 5 / 1000;
+
+    exec_tmout = MAX(exec_tmout, max_us / 1000);
+    exec_tmout = (exec_tmout + EXEC_TM_ROUND) / EXEC_TM_ROUND * EXEC_TM_ROUND;
+
+    if (exec_tmout > EXEC_TIMEOUT) exec_tmout = EXEC_TIMEOUT;
+
+    ACTF("No -t option specified, so I'll use exec timeout of %u ms.", 
+         exec_tmout);
+
+    timeout_given = 1;
+
+  } else if (timeout_given == 3) {
+
+    ACTF("Applying timeout settings from resumed session (%u ms).", exec_tmout);
+
+  }
+
+  /* In dumb mode, re-running every timing out test case with a generous time
+     limit is very expensive, so let's select a more conservative default. */
+
+  if (dumb_mode && !getenv("AFL_HANG_TMOUT"))
+    hang_tmout = MIN(EXEC_TIMEOUT, exec_tmout * 2 + 100);
+
+  OKF("All set and ready to roll!");
+
+}
+
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index dc21de17..2242dd6b 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -22,9042 +22,6 @@
 
 #include "afl-fuzz.h"
 
-int select_algorithm(void) {
-
-  int i_puppet, j_puppet;
-
-  double sele = ((double)(UR(10000))*0.0001);
-  j_puppet = 0;
-  for (i_puppet = 0; i_puppet < operator_num; ++i_puppet) {
-      if (unlikely(i_puppet == 0)) {
-          if (sele < probability_now[swarm_now][i_puppet])
-            break;
-      } else {
-          if (sele < probability_now[swarm_now][i_puppet]) {
-              j_puppet =1;
-              break;
-          }
-      }
-  }
-  if (j_puppet ==1 && sele < probability_now[swarm_now][i_puppet-1])
-    FATAL("error select_algorithm");
-  return i_puppet;
-}
-
-
-/* Shuffle an array of pointers. Might be slightly biased. */
-
-static void shuffle_ptrs(void** ptrs, u32 cnt) {
-
-  u32 i;
-
-  for (i = 0; i < cnt - 2; ++i) {
-
-    u32 j = i + UR(cnt - i);
-    void *s = ptrs[i];
-    ptrs[i] = ptrs[j];
-    ptrs[j] = s;
-
-  }
-
-}
-
-
-#ifdef HAVE_AFFINITY
-
-/* Build a list of processes bound to specific cores. Returns -1 if nothing
-   can be found. Assumes an upper bound of 4k CPUs. */
-
-static void bind_to_free_cpu(void) {
-
-  DIR* d;
-  struct dirent* de;
-  cpu_set_t c;
-
-  u8 cpu_used[4096] = { 0 };
-  u32 i;
-
-  if (cpu_core_count < 2) return;
-
-  if (getenv("AFL_NO_AFFINITY")) {
-
-    WARNF("Not binding to a CPU core (AFL_NO_AFFINITY set).");
-    return;
-
-  }
-
-  d = opendir("/proc");
-
-  if (!d) {
-
-    WARNF("Unable to access /proc - can't scan for free CPU cores.");
-    return;
-
-  }
-
-  ACTF("Checking CPU core loadout...");
-
-  /* Introduce some jitter, in case multiple AFL tasks are doing the same
-     thing at the same time... */
-
-  usleep(R(1000) * 250);
-
-  /* Scan all /proc/<pid>/status entries, checking for Cpus_allowed_list.
-     Flag all processes bound to a specific CPU using cpu_used[]. This will
-     fail for some exotic binding setups, but is likely good enough in almost
-     all real-world use cases. */
-
-  while ((de = readdir(d))) {
-
-    u8* fn;
-    FILE* f;
-    u8 tmp[MAX_LINE];
-    u8 has_vmsize = 0;
-
-    if (!isdigit(de->d_name[0])) continue;
-
-    fn = alloc_printf("/proc/%s/status", de->d_name);
-
-    if (!(f = fopen(fn, "r"))) {
-      ck_free(fn);
-      continue;
-    }
-
-    while (fgets(tmp, MAX_LINE, f)) {
-
-      u32 hval;
-
-      /* Processes without VmSize are probably kernel tasks. */
-
-      if (!strncmp(tmp, "VmSize:\t", 8)) has_vmsize = 1;
-
-      if (!strncmp(tmp, "Cpus_allowed_list:\t", 19) &&
-          !strchr(tmp, '-') && !strchr(tmp, ',') &&
-          sscanf(tmp + 19, "%u", &hval) == 1 && hval < sizeof(cpu_used) &&
-          has_vmsize) {
-
-        cpu_used[hval] = 1;
-        break;
-
-      }
-
-    }
-
-    ck_free(fn);
-    fclose(f);
-
-  }
-
-  closedir(d);
-
-  for (i = 0; i < cpu_core_count; ++i) if (!cpu_used[i]) break;
-
-  if (i == cpu_core_count) {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "Uh-oh, looks like all %d CPU cores on your system are allocated to\n"
-         "    other instances of afl-fuzz (or similar CPU-locked tasks). Starting\n"
-         "    another fuzzer on this machine is probably a bad plan, but if you are\n"
-         "    absolutely sure, you can set AFL_NO_AFFINITY and try again.\n",
-         cpu_core_count);
-
-    FATAL("No more free CPU cores");
-
-  }
-
-  OKF("Found a free CPU core, binding to #%u.", i);
-
-  cpu_aff = i;
-
-  CPU_ZERO(&c);
-  CPU_SET(i, &c);
-
-  if (sched_setaffinity(0, sizeof(c), &c))
-    PFATAL("sched_setaffinity failed");
-
-}
-
-#endif /* HAVE_AFFINITY */
-
-#ifndef IGNORE_FINDS
-
-/* Helper function to compare buffers; returns first and last differing offset. We
-   use this to find reasonable locations for splicing two files. */
-
-static void locate_diffs(u8* ptr1, u8* ptr2, u32 len, s32* first, s32* last) {
-
-  s32 f_loc = -1;
-  s32 l_loc = -1;
-  u32 pos;
-
-  for (pos = 0; pos < len; ++pos) {
-
-    if (*(ptr1++) != *(ptr2++)) {
-
-      if (f_loc == -1) f_loc = pos;
-      l_loc = pos;
-
-    }
-
-  }
-
-  *first = f_loc;
-  *last = l_loc;
-
-  return;
-
-}
-
-#endif /* !IGNORE_FINDS */
-
-
-
-/* Load postprocessor, if available. */
-
-static void setup_post(void) {
-
-  void* dh;
-  u8* fn = getenv("AFL_POST_LIBRARY");
-  u32 tlen = 6;
-
-  if (!fn) return;
-
-  ACTF("Loading postprocessor from '%s'...", fn);
-
-  dh = dlopen(fn, RTLD_NOW);
-  if (!dh) FATAL("%s", dlerror());
-
-  post_handler = dlsym(dh, "afl_postprocess");
-  if (!post_handler) FATAL("Symbol 'afl_postprocess' not found.");
-
-  /* Do a quick test. It's better to segfault now than later =) */
-
-  post_handler("hello", &tlen);
-
-  OKF("Postprocessor installed successfully.");
-
-}
-
-static void setup_custom_mutator(void) {
-  void* dh;
-  u8* fn = getenv("AFL_CUSTOM_MUTATOR_LIBRARY");
-
-  if (!fn) return;
-
-  ACTF("Loading custom mutator library from '%s'...", fn);
-
-  dh = dlopen(fn, RTLD_NOW);
-  if (!dh) FATAL("%s", dlerror());
-
-  custom_mutator = dlsym(dh, "afl_custom_mutator");
-  if (!custom_mutator) FATAL("Symbol 'afl_custom_mutator' not found.");
-
-  pre_save_handler = dlsym(dh, "afl_pre_save_handler");
-//  if (!pre_save_handler) WARNF("Symbol 'afl_pre_save_handler' not found.");
-
-  OKF("Custom mutator installed successfully.");
-}
-
-
-/* Read all testcases from the input directory, then queue them for testing.
-   Called at startup. */
-
-static void read_testcases(void) {
-
-  struct dirent **nl;
-  s32 nl_cnt;
-  u32 i;
-  u8* fn1;
-
-  /* Auto-detect non-in-place resumption attempts. */
-
-  fn1 = alloc_printf("%s/queue", in_dir);
-  if (!access(fn1, F_OK)) in_dir = fn1; else ck_free(fn1);
-
-  ACTF("Scanning '%s'...", in_dir);
-
-  /* We use scandir() + alphasort() rather than readdir() because otherwise,
-     the ordering  of test cases would vary somewhat randomly and would be
-     difficult to control. */
-
-  nl_cnt = scandir(in_dir, &nl, NULL, alphasort);
-
-  if (nl_cnt < 0) {
-
-    if (errno == ENOENT || errno == ENOTDIR)
-
-      SAYF("\n" cLRD "[-] " cRST
-           "The input directory does not seem to be valid - try again. The fuzzer needs\n"
-           "    one or more test case to start with - ideally, a small file under 1 kB\n"
-           "    or so. The cases must be stored as regular files directly in the input\n"
-           "    directory.\n");
-
-    PFATAL("Unable to open '%s'", in_dir);
-
-  }
-
-  if (shuffle_queue && nl_cnt > 1) {
-
-    ACTF("Shuffling queue...");
-    shuffle_ptrs((void**)nl, nl_cnt);
-
-  }
-
-  for (i = 0; i < nl_cnt; ++i) {
-
-    struct stat st;
-
-    u8* fn2 = alloc_printf("%s/%s", in_dir, nl[i]->d_name);
-    u8* dfn = alloc_printf("%s/.state/deterministic_done/%s", in_dir, nl[i]->d_name);
-
-    u8  passed_det = 0;
-
-    free(nl[i]); /* not tracked */
- 
-    if (lstat(fn2, &st) || access(fn2, R_OK))
-      PFATAL("Unable to access '%s'", fn2);
-
-    /* This also takes care of . and .. */
-
-    if (!S_ISREG(st.st_mode) || !st.st_size || strstr(fn2, "/README.txt")) {
-
-      ck_free(fn2);
-      ck_free(dfn);
-      continue;
-
-    }
-
-    if (st.st_size > MAX_FILE) 
-      FATAL("Test case '%s' is too big (%s, limit is %s)", fn2,
-            DMS(st.st_size), DMS(MAX_FILE));
-
-    /* Check for metadata that indicates that deterministic fuzzing
-       is complete for this entry. We don't want to repeat deterministic
-       fuzzing when resuming aborted scans, because it would be pointless
-       and probably very time-consuming. */
-
-    if (!access(dfn, F_OK)) passed_det = 1;
-    ck_free(dfn);
-
-    add_to_queue(fn2, st.st_size, passed_det);
-
-  }
-
-  free(nl); /* not tracked */
-
-  if (!queued_paths) {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "Looks like there are no valid test cases in the input directory! The fuzzer\n"
-         "    needs one or more test case to start with - ideally, a small file under\n"
-         "    1 kB or so. The cases must be stored as regular files directly in the\n"
-         "    input directory.\n");
-
-    FATAL("No usable test cases in '%s'", in_dir);
-
-  }
-
-  last_path_time = 0;
-  queued_at_start = queued_paths;
-
-}
-
-
-/* Execute target application, monitoring for timeouts. Return status
-   information. The called program will update trace_bits[]. */
-
-static u8 run_target(char** argv, u32 timeout) {
-
-  static struct itimerval it;
-  static u32 prev_timed_out = 0;
-  static u64 exec_ms = 0;
-
-  int status = 0;
-  u32 tb4;
-
-  child_timed_out = 0;
-
-  /* After this memset, trace_bits[] are effectively volatile, so we
-     must prevent any earlier operations from venturing into that
-     territory. */
-
-  memset(trace_bits, 0, MAP_SIZE);
-  MEM_BARRIER();
-
-  /* If we're running in "dumb" mode, we can't rely on the fork server
-     logic compiled into the target program, so we will just keep calling
-     execve(). There is a bit of code duplication between here and 
-     init_forkserver(), but c'est la vie. */
-
-  if (dumb_mode == 1 || no_forkserver) {
-
-    child_pid = fork();
-
-    if (child_pid < 0) PFATAL("fork() failed");
-
-    if (!child_pid) {
-
-      struct rlimit r;
-
-      if (mem_limit) {
-
-        r.rlim_max = r.rlim_cur = ((rlim_t)mem_limit) << 20;
-
-#ifdef RLIMIT_AS
-
-        setrlimit(RLIMIT_AS, &r); /* Ignore errors */
-
-#else
-
-        setrlimit(RLIMIT_DATA, &r); /* Ignore errors */
-
-#endif /* ^RLIMIT_AS */
-
-      }
-
-      r.rlim_max = r.rlim_cur = 0;
-
-      setrlimit(RLIMIT_CORE, &r); /* Ignore errors */
-
-      /* Isolate the process and configure standard descriptors. If out_file is
-         specified, stdin is /dev/null; otherwise, out_fd is cloned instead. */
-
-      setsid();
-
-      dup2(dev_null_fd, 1);
-      dup2(dev_null_fd, 2);
-
-      if (out_file) {
-
-        dup2(dev_null_fd, 0);
-
-      } else {
-
-        dup2(out_fd, 0);
-        close(out_fd);
-
-      }
-
-      /* On Linux, would be faster to use O_CLOEXEC. Maybe TODO. */
-
-      close(dev_null_fd);
-      close(out_dir_fd);
-#ifndef HAVE_ARC4RANDOM
-      close(dev_urandom_fd);
-#endif
-      close(fileno(plot_file));
-
-      /* Set sane defaults for ASAN if nothing else specified. */
-
-      setenv("ASAN_OPTIONS", "abort_on_error=1:"
-                             "detect_leaks=0:"
-                             "symbolize=0:"
-                             "allocator_may_return_null=1", 0);
-
-      setenv("MSAN_OPTIONS", "exit_code=" STRINGIFY(MSAN_ERROR) ":"
-                             "symbolize=0:"
-                             "msan_track_origins=0", 0);
-
-      execv(target_path, argv);
-
-      /* Use a distinctive bitmap value to tell the parent about execv()
-         falling through. */
-
-      *(u32*)trace_bits = EXEC_FAIL_SIG;
-      exit(0);
-
-    }
-
-  } else {
-
-    s32 res;
-
-    /* In non-dumb mode, we have the fork server up and running, so simply
-       tell it to have at it, and then read back PID. */
-
-    if ((res = write(fsrv_ctl_fd, &prev_timed_out, 4)) != 4) {
-
-      if (stop_soon) return 0;
-      RPFATAL(res, "Unable to request new process from fork server (OOM?)");
-
-    }
-
-    if ((res = read(fsrv_st_fd, &child_pid, 4)) != 4) {
-
-      if (stop_soon) return 0;
-      RPFATAL(res, "Unable to request new process from fork server (OOM?)");
-
-    }
-
-    if (child_pid <= 0) FATAL("Fork server is misbehaving (OOM?)");
-
-  }
-
-  /* Configure timeout, as requested by user, then wait for child to terminate. */
-
-  it.it_value.tv_sec = (timeout / 1000);
-  it.it_value.tv_usec = (timeout % 1000) * 1000;
-
-  setitimer(ITIMER_REAL, &it, NULL);
-
-  /* The SIGALRM handler simply kills the child_pid and sets child_timed_out. */
-
-  if (dumb_mode == 1 || no_forkserver) {
-
-    if (waitpid(child_pid, &status, 0) <= 0) PFATAL("waitpid() failed");
-
-  } else {
-
-    s32 res;
-
-    if ((res = read(fsrv_st_fd, &status, 4)) != 4) {
-
-      if (stop_soon) return 0;
-      RPFATAL(res, "Unable to communicate with fork server (OOM?)");
-
-    }
-
-  }
-
-  if (!WIFSTOPPED(status)) child_pid = 0;
-  
-  getitimer(ITIMER_REAL, &it);
-  exec_ms = (u64) timeout - (it.it_value.tv_sec * 1000 + it.it_value.tv_usec / 1000);
-  if (slowest_exec_ms < exec_ms) slowest_exec_ms = exec_ms;
-
-  it.it_value.tv_sec = 0;
-  it.it_value.tv_usec = 0;
-
-  setitimer(ITIMER_REAL, &it, NULL);
-
-  ++total_execs;
-
-  /* Any subsequent operations on trace_bits must not be moved by the
-     compiler below this point. Past this location, trace_bits[] behave
-     very normally and do not have to be treated as volatile. */
-
-  MEM_BARRIER();
-
-  tb4 = *(u32*)trace_bits;
-
-#ifdef __x86_64__
-  classify_counts((u64*)trace_bits);
-#else
-  classify_counts((u32*)trace_bits);
-#endif /* ^__x86_64__ */
-
-  prev_timed_out = child_timed_out;
-
-  /* Report outcome to caller. */
-
-  if (WIFSIGNALED(status) && !stop_soon) {
-
-    kill_signal = WTERMSIG(status);
-
-    if (child_timed_out && kill_signal == SIGKILL) return FAULT_TMOUT;
-
-    return FAULT_CRASH;
-
-  }
-
-  /* A somewhat nasty hack for MSAN, which doesn't support abort_on_error and
-     must use a special exit code. */
-
-  if (uses_asan && WEXITSTATUS(status) == MSAN_ERROR) {
-    kill_signal = 0;
-    return FAULT_CRASH;
-  }
-
-  if ((dumb_mode == 1 || no_forkserver) && tb4 == EXEC_FAIL_SIG)
-    return FAULT_ERROR;
-
-  return FAULT_NONE;
-
-}
-
-
-/* Write modified data to file for testing. If out_file is set, the old file
-   is unlinked and a new one is created. Otherwise, out_fd is rewound and
-   truncated. */
-
-static void write_to_testcase(void* mem, u32 len) {
-
-  s32 fd = out_fd;
-
-  if (out_file) {
-
-    unlink(out_file); /* Ignore errors. */
-
-    fd = open(out_file, O_WRONLY | O_CREAT | O_EXCL, 0600);
-
-    if (fd < 0) PFATAL("Unable to create '%s'", out_file);
-
-  } else lseek(fd, 0, SEEK_SET);
-
-  if (pre_save_handler) {
-    u8* new_data;
-    size_t new_size = pre_save_handler(mem, len, &new_data);
-    ck_write(fd, new_data, new_size, out_file);
-  } else {
-    ck_write(fd, mem, len, out_file);
-  }
-
-  if (!out_file) {
-
-    if (ftruncate(fd, len)) PFATAL("ftruncate() failed");
-    lseek(fd, 0, SEEK_SET);
-
-  } else close(fd);
-
-}
-
-
-/* The same, but with an adjustable gap. Used for trimming. */
-
-static void write_with_gap(void* mem, u32 len, u32 skip_at, u32 skip_len) {
-
-  s32 fd = out_fd;
-  u32 tail_len = len - skip_at - skip_len;
-
-  if (out_file) {
-
-    unlink(out_file); /* Ignore errors. */
-
-    fd = open(out_file, O_WRONLY | O_CREAT | O_EXCL, 0600);
-
-    if (fd < 0) PFATAL("Unable to create '%s'", out_file);
-
-  } else lseek(fd, 0, SEEK_SET);
-
-  if (skip_at) ck_write(fd, mem, skip_at, out_file);
-
-  u8 *memu8 = mem;
-  if (tail_len) ck_write(fd, memu8 + skip_at + skip_len, tail_len, out_file);
-
-  if (!out_file) {
-
-    if (ftruncate(fd, len - skip_len)) PFATAL("ftruncate() failed");
-    lseek(fd, 0, SEEK_SET);
-
-  } else close(fd);
-
-}
-
-
-static void show_stats(void);
-
-/* Calibrate a new test case. This is done when processing the input directory
-   to warn about flaky or otherwise problematic test cases early on; and when
-   new paths are discovered to detect variable behavior and so on. */
-
-static u8 calibrate_case(char** argv, struct queue_entry* q, u8* use_mem,
-                         u32 handicap, u8 from_queue) {
-
-  static u8 first_trace[MAP_SIZE];
-
-  u8  fault = 0, new_bits = 0, var_detected = 0,
-      first_run = (q->exec_cksum == 0);
-
-  u64 start_us, stop_us;
-
-  s32 old_sc = stage_cur, old_sm = stage_max;
-  u32 use_tmout = exec_tmout;
-  u8* old_sn = stage_name;
-
-  /* Be a bit more generous about timeouts when resuming sessions, or when
-     trying to calibrate already-added finds. This helps avoid trouble due
-     to intermittent latency. */
-
-  if (!from_queue || resuming_fuzz)
-    use_tmout = MAX(exec_tmout + CAL_TMOUT_ADD,
-                    exec_tmout * CAL_TMOUT_PERC / 100);
-
-  ++q->cal_failed;
-
-  stage_name = "calibration";
-  stage_max  = fast_cal ? 3 : CAL_CYCLES;
-
-  /* Make sure the forkserver is up before we do anything, and let's not
-     count its spin-up time toward binary calibration. */
-
-  if (dumb_mode != 1 && !no_forkserver && !forksrv_pid)
-    init_forkserver(argv);
-
-  if (q->exec_cksum) memcpy(first_trace, trace_bits, MAP_SIZE);
-
-  start_us = get_cur_time_us();
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-    u32 cksum;
-
-    if (!first_run && !(stage_cur % stats_update_freq)) show_stats();
-
-    write_to_testcase(use_mem, q->len);
-
-    fault = run_target(argv, use_tmout);
-
-    /* stop_soon is set by the handler for Ctrl+C. When it's pressed,
-       we want to bail out quickly. */
-
-    if (stop_soon || fault != crash_mode) goto abort_calibration;
-
-    if (!dumb_mode && !stage_cur && !count_bytes(trace_bits)) {
-      fault = FAULT_NOINST;
-      goto abort_calibration;
-    }
-
-    cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-    if (q->exec_cksum != cksum) {
-
-      u8 hnb = has_new_bits(virgin_bits);
-      if (hnb > new_bits) new_bits = hnb;
-
-      if (q->exec_cksum) {
-
-        u32 i;
-
-        for (i = 0; i < MAP_SIZE; ++i) {
-
-          if (!var_bytes[i] && first_trace[i] != trace_bits[i]) {
-
-            var_bytes[i] = 1;
-            stage_max    = CAL_CYCLES_LONG;
-
-          }
-
-        }
-
-        var_detected = 1;
-
-      } else {
-
-        q->exec_cksum = cksum;
-        memcpy(first_trace, trace_bits, MAP_SIZE);
-
-      }
-
-    }
-
-  }
-
-  stop_us = get_cur_time_us();
-
-  total_cal_us     += stop_us - start_us;
-  total_cal_cycles += stage_max;
-
-  /* OK, let's collect some stats about the performance of this test case.
-     This is used for fuzzing air time calculations in calculate_score(). */
-
-  q->exec_us     = (stop_us - start_us) / stage_max;
-  q->bitmap_size = count_bytes(trace_bits);
-  q->handicap    = handicap;
-  q->cal_failed  = 0;
-
-  total_bitmap_size += q->bitmap_size;
-  ++total_bitmap_entries;
-
-  update_bitmap_score(q);
-
-  /* If this case didn't result in new output from the instrumentation, tell
-     parent. This is a non-critical problem, but something to warn the user
-     about. */
-
-  if (!dumb_mode && first_run && !fault && !new_bits) fault = FAULT_NOBITS;
-
-abort_calibration:
-
-  if (new_bits == 2 && !q->has_new_cov) {
-    q->has_new_cov = 1;
-    ++queued_with_cov;
-  }
-
-  /* Mark variable paths. */
-
-  if (var_detected) {
-
-    var_byte_count = count_bytes(var_bytes);
-
-    if (!q->var_behavior) {
-      mark_as_variable(q);
-      ++queued_variable;
-    }
-
-  }
-
-  stage_name = old_sn;
-  stage_cur  = old_sc;
-  stage_max  = old_sm;
-
-  if (!first_run) show_stats();
-
-  return fault;
-
-}
-
-
-/* Examine map coverage. Called once, for first test case. */
-
-static void check_map_coverage(void) {
-
-  u32 i;
-
-  if (count_bytes(trace_bits) < 100) return;
-
-  for (i = (1 << (MAP_SIZE_POW2 - 1)); i < MAP_SIZE; ++i)
-    if (trace_bits[i]) return;
-
-  WARNF("Recompile binary with newer version of afl to improve coverage!");
-
-}
-
-
-/* Perform dry run of all test cases to confirm that the app is working as
-   expected. This is done only for the initial inputs, and only once. */
-
-static void perform_dry_run(char** argv) {
-
-  struct queue_entry* q = queue;
-  u32 cal_failures = 0;
-  u8* skip_crashes = getenv("AFL_SKIP_CRASHES");
-
-  while (q) {
-
-    u8* use_mem;
-    u8  res;
-    s32 fd;
-
-    u8* fn = strrchr(q->fname, '/') + 1;
-
-    ACTF("Attempting dry run with '%s'...", fn);
-
-    fd = open(q->fname, O_RDONLY);
-    if (fd < 0) PFATAL("Unable to open '%s'", q->fname);
-
-    use_mem = ck_alloc_nozero(q->len);
-
-    if (read(fd, use_mem, q->len) != q->len)
-      FATAL("Short read from '%s'", q->fname);
-
-    close(fd);
-
-    res = calibrate_case(argv, q, use_mem, 0, 1);
-    ck_free(use_mem);
-
-    if (stop_soon) return;
-
-    if (res == crash_mode || res == FAULT_NOBITS)
-      SAYF(cGRA "    len = %u, map size = %u, exec speed = %llu us\n" cRST, 
-           q->len, q->bitmap_size, q->exec_us);
-
-    switch (res) {
-
-      case FAULT_NONE:
-
-        if (q == queue) check_map_coverage();
-
-        if (crash_mode) FATAL("Test case '%s' does *NOT* crash", fn);
-
-        break;
-
-      case FAULT_TMOUT:
-
-        if (timeout_given) {
-
-          /* The -t nn+ syntax in the command line sets timeout_given to '2' and
-             instructs afl-fuzz to tolerate but skip queue entries that time
-             out. */
-
-          if (timeout_given > 1) {
-            WARNF("Test case results in a timeout (skipping)");
-            q->cal_failed = CAL_CHANCES;
-            ++cal_failures;
-            break;
-          }
-
-          SAYF("\n" cLRD "[-] " cRST
-               "The program took more than %u ms to process one of the initial test cases.\n"
-               "    Usually, the right thing to do is to relax the -t option - or to delete it\n"
-               "    altogether and allow the fuzzer to auto-calibrate. That said, if you know\n"
-               "    what you are doing and want to simply skip the unruly test cases, append\n"
-               "    '+' at the end of the value passed to -t ('-t %u+').\n", exec_tmout,
-               exec_tmout);
-
-          FATAL("Test case '%s' results in a timeout", fn);
-
-        } else {
-
-          SAYF("\n" cLRD "[-] " cRST
-               "The program took more than %u ms to process one of the initial test cases.\n"
-               "    This is bad news; raising the limit with the -t option is possible, but\n"
-               "    will probably make the fuzzing process extremely slow.\n\n"
-
-               "    If this test case is just a fluke, the other option is to just avoid it\n"
-               "    altogether, and find one that is less of a CPU hog.\n", exec_tmout);
-
-          FATAL("Test case '%s' results in a timeout", fn);
-
-        }
-
-      case FAULT_CRASH:  
-
-        if (crash_mode) break;
-
-        if (skip_crashes) {
-          WARNF("Test case results in a crash (skipping)");
-          q->cal_failed = CAL_CHANCES;
-          ++cal_failures;
-          break;
-        }
-
-        if (mem_limit) {
-
-          SAYF("\n" cLRD "[-] " cRST
-               "Oops, the program crashed with one of the test cases provided. There are\n"
-               "    several possible explanations:\n\n"
-
-               "    - The test case causes known crashes under normal working conditions. If\n"
-               "      so, please remove it. The fuzzer should be seeded with interesting\n"
-               "      inputs - but not ones that cause an outright crash.\n\n"
-
-               "    - The current memory limit (%s) is too low for this program, causing\n"
-               "      it to die due to OOM when parsing valid files. To fix this, try\n"
-               "      bumping it up with the -m setting in the command line. If in doubt,\n"
-               "      try something along the lines of:\n\n"
-
-               MSG_ULIMIT_USAGE " /path/to/binary [...] <testcase )\n\n"
-
-               "      Tip: you can use http://jwilk.net/software/recidivm to quickly\n"
-               "      estimate the required amount of virtual memory for the binary. Also,\n"
-               "      if you are using ASAN, see %s/notes_for_asan.txt.\n\n"
-
-               MSG_FORK_ON_APPLE
-
-               "    - Least likely, there is a horrible bug in the fuzzer. If other options\n"
-               "      fail, poke <afl-users@googlegroups.com> for troubleshooting tips.\n",
-               DMS(mem_limit << 20), mem_limit - 1, doc_path);
-
-        } else {
-
-          SAYF("\n" cLRD "[-] " cRST
-               "Oops, the program crashed with one of the test cases provided. There are\n"
-               "    several possible explanations:\n\n"
-
-               "    - The test case causes known crashes under normal working conditions. If\n"
-               "      so, please remove it. The fuzzer should be seeded with interesting\n"
-               "      inputs - but not ones that cause an outright crash.\n\n"
-
-               MSG_FORK_ON_APPLE
-
-               "    - Least likely, there is a horrible bug in the fuzzer. If other options\n"
-               "      fail, poke <afl-users@googlegroups.com> for troubleshooting tips.\n");
-
-        }
-#undef MSG_ULIMIT_USAGE
-#undef MSG_FORK_ON_APPLE
-
-        FATAL("Test case '%s' results in a crash", fn);
-
-      case FAULT_ERROR:
-
-        FATAL("Unable to execute target application ('%s')", argv[0]);
-
-      case FAULT_NOINST:
-
-        FATAL("No instrumentation detected");
-
-      case FAULT_NOBITS: 
-
-        ++useless_at_start;
-
-        if (!in_bitmap && !shuffle_queue)
-          WARNF("No new instrumentation output, test case may be useless.");
-
-        break;
-
-    }
-
-    if (q->var_behavior) WARNF("Instrumentation output varies across runs.");
-
-    q = q->next;
-
-  }
-
-  if (cal_failures) {
-
-    if (cal_failures == queued_paths)
-      FATAL("All test cases time out%s, giving up!",
-            skip_crashes ? " or crash" : "");
-
-    WARNF("Skipped %u test cases (%0.02f%%) due to timeouts%s.", cal_failures,
-          ((double)cal_failures) * 100 / queued_paths,
-          skip_crashes ? " or crashes" : "");
-
-    if (cal_failures * 5 > queued_paths)
-      WARNF(cLRD "High percentage of rejected test cases, check settings!");
-
-  }
-
-  OKF("All test cases processed.");
-
-}
-
-
-/* Helper function: link() if possible, copy otherwise. */
-
-static void link_or_copy(u8* old_path, u8* new_path) {
-
-  s32 i = link(old_path, new_path);
-  s32 sfd, dfd;
-  u8* tmp;
-
-  if (!i) return;
-
-  sfd = open(old_path, O_RDONLY);
-  if (sfd < 0) PFATAL("Unable to open '%s'", old_path);
-
-  dfd = open(new_path, O_WRONLY | O_CREAT | O_EXCL, 0600);
-  if (dfd < 0) PFATAL("Unable to create '%s'", new_path);
-
-  tmp = ck_alloc(64 * 1024);
-
-  while ((i = read(sfd, tmp, 64 * 1024)) > 0) 
-    ck_write(dfd, tmp, i, new_path);
-
-  if (i < 0) PFATAL("read() failed");
-
-  ck_free(tmp);
-  close(sfd);
-  close(dfd);
-
-}
-
-
-static void nuke_resume_dir(void);
-
-/* Create hard links for input test cases in the output directory, choosing
-   good names and pivoting accordingly. */
-
-static void pivot_inputs(void) {
-
-  struct queue_entry* q = queue;
-  u32 id = 0;
-
-  ACTF("Creating hard links for all input files...");
-
-  while (q) {
-
-    u8  *nfn, *rsl = strrchr(q->fname, '/');
-    u32 orig_id;
-
-    if (!rsl) rsl = q->fname; else ++rsl;
-
-    /* If the original file name conforms to the syntax and the recorded
-       ID matches the one we'd assign, just use the original file name.
-       This is valuable for resuming fuzzing runs. */
-
-#ifndef SIMPLE_FILES
-#  define CASE_PREFIX "id:"
-#else
-#  define CASE_PREFIX "id_"
-#endif /* ^!SIMPLE_FILES */
-
-    if (!strncmp(rsl, CASE_PREFIX, 3) &&
-        sscanf(rsl + 3, "%06u", &orig_id) == 1 && orig_id == id) {
-
-      u8* src_str;
-      u32 src_id;
-
-      resuming_fuzz = 1;
-      nfn = alloc_printf("%s/queue/%s", out_dir, rsl);
-
-      /* Since we're at it, let's also try to find parent and figure out the
-         appropriate depth for this entry. */
-
-      src_str = strchr(rsl + 3, ':');
-
-      if (src_str && sscanf(src_str + 1, "%06u", &src_id) == 1) {
-
-        struct queue_entry* s = queue;
-        while (src_id-- && s) s = s->next;
-        if (s) q->depth = s->depth + 1;
-
-        if (max_depth < q->depth) max_depth = q->depth;
-
-      }
-
-    } else {
-
-      /* No dice - invent a new name, capturing the original one as a
-         substring. */
-
-#ifndef SIMPLE_FILES
-
-      u8* use_name = strstr(rsl, ",orig:");
-
-      if (use_name) use_name += 6; else use_name = rsl;
-      nfn = alloc_printf("%s/queue/id:%06u,orig:%s", out_dir, id, use_name);
-
-#else
-
-      nfn = alloc_printf("%s/queue/id_%06u", out_dir, id);
-
-#endif /* ^!SIMPLE_FILES */
-
-    }
-
-    /* Pivot to the new queue entry. */
-
-    link_or_copy(q->fname, nfn);
-    ck_free(q->fname);
-    q->fname = nfn;
-
-    /* Make sure that the passed_det value carries over, too. */
-
-    if (q->passed_det) mark_as_det_done(q);
-
-    q = q->next;
-    ++id;
-
-  }
-
-  if (in_place_resume) nuke_resume_dir();
-
-}
-
-
-#ifndef SIMPLE_FILES
-
-/* Construct a file name for a new test case, capturing the operation
-   that led to its discovery. Uses a static buffer. */
-
-static u8* describe_op(u8 hnb) {
-
-  static u8 ret[256];
-
-  if (syncing_party) {
-
-    sprintf(ret, "sync:%s,src:%06u", syncing_party, syncing_case);
-
-  } else {
-
-    sprintf(ret, "src:%06u", current_entry);
-
-    sprintf(ret + strlen(ret), ",time:%llu", get_cur_time() - start_time);
-
-    if (splicing_with >= 0)
-      sprintf(ret + strlen(ret), "+%06d", splicing_with);
-
-    sprintf(ret + strlen(ret), ",op:%s", stage_short);
-
-    if (stage_cur_byte >= 0) {
-
-      sprintf(ret + strlen(ret), ",pos:%d", stage_cur_byte);
-
-      if (stage_val_type != STAGE_VAL_NONE)
-        sprintf(ret + strlen(ret), ",val:%s%+d", 
-                (stage_val_type == STAGE_VAL_BE) ? "be:" : "",
-                stage_cur_val);
-
-    } else sprintf(ret + strlen(ret), ",rep:%d", stage_cur_val);
-
-  }
-
-  if (hnb == 2) strcat(ret, ",+cov");
-
-  return ret;
-
-}
-
-#endif /* !SIMPLE_FILES */
-
-
-/* Write a message accompanying the crash directory :-) */
-
-static void write_crash_readme(void) {
-
-  u8* fn = alloc_printf("%s/crashes/README.txt", out_dir);
-  s32 fd;
-  FILE* f;
-
-  fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
-  ck_free(fn);
-
-  /* Do not die on errors here - that would be impolite. */
-
-  if (fd < 0) return;
-
-  f = fdopen(fd, "w");
-
-  if (!f) {
-    close(fd);
-    return;
-  }
-
-  fprintf(f, "Command line used to find this crash:\n\n"
-
-             "%s\n\n"
-
-             "If you can't reproduce a bug outside of afl-fuzz, be sure to set the same\n"
-             "memory limit. The limit used for this fuzzing session was %s.\n\n"
-
-             "Need a tool to minimize test cases before investigating the crashes or sending\n"
-             "them to a vendor? Check out the afl-tmin that comes with the fuzzer!\n\n"
-
-             "Found any cool bugs in open-source tools using afl-fuzz? If yes, please drop\n"
-             "an mail at <afl-users@googlegroups.com> once the issues are fixed\n\n"
-
-             "  https://github.com/vanhauser-thc/AFLplusplus\n\n",
-
-             orig_cmdline, DMS(mem_limit << 20)); /* ignore errors */
-
-  fclose(f);
-
-}
-
-
-/* Check if the result of an execve() during routine fuzzing is interesting,
-   save or queue the input test case for further analysis if so. Returns 1 if
-   entry is saved, 0 otherwise. */
-
-static u8 save_if_interesting(char** argv, void* mem, u32 len, u8 fault) {
-
-  if (len == 0) return 0;
-
-  u8  *fn = "";
-  u8  hnb;
-  s32 fd;
-  u8  keeping = 0, res;
-
-  /* Update path frequency. */
-  u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-  struct queue_entry* q = queue;
-  while (q) {
-    if (q->exec_cksum == cksum)
-      q->n_fuzz = q->n_fuzz + 1;
-
-    q = q->next;
-
-  }
-
-  if (fault == crash_mode) {
-
-    /* Keep only if there are new bits in the map, add to queue for
-       future fuzzing, etc. */
-
-    if (!(hnb = has_new_bits(virgin_bits))) {
-      if (crash_mode) ++total_crashes;
-      return 0;
-    }    
-
-#ifndef SIMPLE_FILES
-
-    fn = alloc_printf("%s/queue/id:%06u,%s", out_dir, queued_paths,
-                      describe_op(hnb));
-
-#else
-
-    fn = alloc_printf("%s/queue/id_%06u", out_dir, queued_paths);
-
-#endif /* ^!SIMPLE_FILES */
-
-    add_to_queue(fn, len, 0);
-
-    if (hnb == 2) {
-      queue_top->has_new_cov = 1;
-      ++queued_with_cov;
-    }
-
-    queue_top->exec_cksum = cksum;
-
-    /* Try to calibrate inline; this also calls update_bitmap_score() when
-       successful. */
-
-    res = calibrate_case(argv, queue_top, mem, queue_cycle - 1, 0);
-
-    if (res == FAULT_ERROR)
-      FATAL("Unable to execute target application");
-
-    fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
-    if (fd < 0) PFATAL("Unable to create '%s'", fn);
-    ck_write(fd, mem, len, fn);
-    close(fd);
-
-    keeping = 1;
-
-  }
-
-  switch (fault) {
-
-    case FAULT_TMOUT:
-
-      /* Timeouts are not very interesting, but we're still obliged to keep
-         a handful of samples. We use the presence of new bits in the
-         hang-specific bitmap as a signal of uniqueness. In "dumb" mode, we
-         just keep everything. */
-
-      ++total_tmouts;
-
-      if (unique_hangs >= KEEP_UNIQUE_HANG) return keeping;
-
-      if (!dumb_mode) {
-
-#ifdef __x86_64__
-        simplify_trace((u64*)trace_bits);
-#else
-        simplify_trace((u32*)trace_bits);
-#endif /* ^__x86_64__ */
-
-        if (!has_new_bits(virgin_tmout)) return keeping;
-
-      }
-
-      ++unique_tmouts;
-
-      /* Before saving, we make sure that it's a genuine hang by re-running
-         the target with a more generous timeout (unless the default timeout
-         is already generous). */
-
-      if (exec_tmout < hang_tmout) {
-
-        u8 new_fault;
-        write_to_testcase(mem, len);
-        new_fault = run_target(argv, hang_tmout);
-
-        /* A corner case that one user reported bumping into: increasing the
-           timeout actually uncovers a crash. Make sure we don't discard it if
-           so. */
-
-        if (!stop_soon && new_fault == FAULT_CRASH) goto keep_as_crash;
-
-        if (stop_soon || new_fault != FAULT_TMOUT) return keeping;
-
-      }
-
-#ifndef SIMPLE_FILES
-
-      fn = alloc_printf("%s/hangs/id:%06llu,%s", out_dir,
-                        unique_hangs, describe_op(0));
-
-#else
-
-      fn = alloc_printf("%s/hangs/id_%06llu", out_dir,
-                        unique_hangs);
-
-#endif /* ^!SIMPLE_FILES */
-
-      ++unique_hangs;
-
-      last_hang_time = get_cur_time();
-
-      break;
-
-    case FAULT_CRASH:
-
-keep_as_crash:
-
-      /* This is handled in a manner roughly similar to timeouts,
-         except for slightly different limits and no need to re-run test
-         cases. */
-
-      ++total_crashes;
-
-      if (unique_crashes >= KEEP_UNIQUE_CRASH) return keeping;
-
-      if (!dumb_mode) {
-
-#ifdef __x86_64__
-        simplify_trace((u64*)trace_bits);
-#else
-        simplify_trace((u32*)trace_bits);
-#endif /* ^__x86_64__ */
-
-        if (!has_new_bits(virgin_crash)) return keeping;
-
-      }
-
-      if (!unique_crashes) write_crash_readme();
-
-#ifndef SIMPLE_FILES
-
-      fn = alloc_printf("%s/crashes/id:%06llu,sig:%02u,%s", out_dir,
-                        unique_crashes, kill_signal, describe_op(0));
-
-#else
-
-      fn = alloc_printf("%s/crashes/id_%06llu_%02u", out_dir, unique_crashes,
-                        kill_signal);
-
-#endif /* ^!SIMPLE_FILES */
-
-      ++unique_crashes;
-
-      last_crash_time = get_cur_time();
-      last_crash_execs = total_execs;
-
-      break;
-
-    case FAULT_ERROR: FATAL("Unable to execute target application");
-
-    default: return keeping;
-
-  }
-
-  /* If we're here, we apparently want to save the crash or hang
-     test case, too. */
-
-  fd = open(fn, O_WRONLY | O_CREAT | O_EXCL, 0600);
-  if (fd < 0) PFATAL("Unable to create '%s'", fn);
-  ck_write(fd, mem, len, fn);
-  close(fd);
-
-  ck_free(fn);
-
-  return keeping;
-
-}
-
-
-/* When resuming, try to find the queue position to start from. This makes sense
-   only when resuming, and when we can find the original fuzzer_stats. */
-
-static u32 find_start_position(void) {
-
-  static u8 tmp[4096]; /* Ought to be enough for anybody. */
-
-  u8  *fn, *off;
-  s32 fd, i;
-  u32 ret;
-
-  if (!resuming_fuzz) return 0;
-
-  if (in_place_resume) fn = alloc_printf("%s/fuzzer_stats", out_dir);
-  else fn = alloc_printf("%s/../fuzzer_stats", in_dir);
-
-  fd = open(fn, O_RDONLY);
-  ck_free(fn);
-
-  if (fd < 0) return 0;
-
-  i = read(fd, tmp, sizeof(tmp) - 1); (void)i; /* Ignore errors */
-  close(fd);
-
-  off = strstr(tmp, "cur_path          : ");
-  if (!off) return 0;
-
-  ret = atoi(off + 20);
-  if (ret >= queued_paths) ret = 0;
-  return ret;
-
-}
-
-
-/* The same, but for timeouts. The idea is that when resuming sessions without
-   -t given, we don't want to keep auto-scaling the timeout over and over
-   again to prevent it from growing due to random flukes. */
-
-static void find_timeout(void) {
-
-  static u8 tmp[4096]; /* Ought to be enough for anybody. */
-
-  u8  *fn, *off;
-  s32 fd, i;
-  u32 ret;
-
-  if (!resuming_fuzz) return;
-
-  if (in_place_resume) fn = alloc_printf("%s/fuzzer_stats", out_dir);
-  else fn = alloc_printf("%s/../fuzzer_stats", in_dir);
-
-  fd = open(fn, O_RDONLY);
-  ck_free(fn);
-
-  if (fd < 0) return;
-
-  i = read(fd, tmp, sizeof(tmp) - 1); (void)i; /* Ignore errors */
-  close(fd);
-
-  off = strstr(tmp, "exec_timeout   : ");
-  if (!off) return;
-
-  ret = atoi(off + 17);
-  if (ret <= 4) return;
-
-  exec_tmout = ret;
-  timeout_given = 3;
-
-}
-
-
-/* Update stats file for unattended monitoring. */
-
-static void write_stats_file(double bitmap_cvg, double stability, double eps) {
-
-  static double last_bcvg, last_stab, last_eps;
-  static struct rusage usage;
-
-  u8* fn = alloc_printf("%s/fuzzer_stats", out_dir);
-  s32 fd;
-  FILE* f;
-
-  fd = open(fn, O_WRONLY | O_CREAT | O_TRUNC, 0600);
-
-  if (fd < 0) PFATAL("Unable to create '%s'", fn);
-
-  ck_free(fn);
-
-  f = fdopen(fd, "w");
-
-  if (!f) PFATAL("fdopen() failed");
-
-  /* Keep last values in case we're called from another context
-     where exec/sec stats and such are not readily available. */
-
-  if (!bitmap_cvg && !stability && !eps) {
-    bitmap_cvg = last_bcvg;
-    stability  = last_stab;
-    eps        = last_eps;
-  } else {
-    last_bcvg = bitmap_cvg;
-    last_stab = stability;
-    last_eps  = eps;
-  }
-
-  fprintf(f, "start_time        : %llu\n"
-             "last_update       : %llu\n"
-             "fuzzer_pid        : %d\n"
-             "cycles_done       : %llu\n"
-             "execs_done        : %llu\n"
-             "execs_per_sec     : %0.02f\n"
-             "paths_total       : %u\n"
-             "paths_favored     : %u\n"
-             "paths_found       : %u\n"
-             "paths_imported    : %u\n"
-             "max_depth         : %u\n"
-             "cur_path          : %u\n" /* Must match find_start_position() */
-             "pending_favs      : %u\n"
-             "pending_total     : %u\n"
-             "variable_paths    : %u\n"
-             "stability         : %0.02f%%\n"
-             "bitmap_cvg        : %0.02f%%\n"
-             "unique_crashes    : %llu\n"
-             "unique_hangs      : %llu\n"
-             "last_path         : %llu\n"
-             "last_crash        : %llu\n"
-             "last_hang         : %llu\n"
-             "execs_since_crash : %llu\n"
-             "exec_timeout      : %u\n"
-             "slowest_exec_ms   : %llu\n"
-             "peak_rss_mb       : %lu\n"
-             "afl_banner        : %s\n"
-             "afl_version       : " VERSION "\n"
-             "target_mode       : %s%s%s%s%s%s%s%s\n"
-             "command_line      : %s\n",
-             start_time / 1000, get_cur_time() / 1000, getpid(),
-             queue_cycle ? (queue_cycle - 1) : 0, total_execs, eps,
-             queued_paths, queued_favored, queued_discovered, queued_imported,
-             max_depth, current_entry, pending_favored, pending_not_fuzzed,
-             queued_variable, stability, bitmap_cvg, unique_crashes,
-             unique_hangs, last_path_time / 1000, last_crash_time / 1000,
-             last_hang_time / 1000, total_execs - last_crash_execs,
-             exec_tmout, slowest_exec_ms, (unsigned long int)usage.ru_maxrss, use_banner,
-             unicorn_mode ? "unicorn" : "", qemu_mode ? "qemu " : "", dumb_mode ? " dumb " : "",
-             no_forkserver ? "no_forksrv " : "", crash_mode ? "crash " : "",
-             persistent_mode ? "persistent " : "", deferred_mode ? "deferred " : "",
-             (unicorn_mode || qemu_mode || dumb_mode || no_forkserver || crash_mode ||
-              persistent_mode || deferred_mode) ? "" : "default",
-             orig_cmdline);
-             /* ignore errors */
-
-  fclose(f);
-
-}
-
-
-/* Update the plot file if there is a reason to. */
-
-static void maybe_update_plot_file(double bitmap_cvg, double eps) {
-
-  static u32 prev_qp, prev_pf, prev_pnf, prev_ce, prev_md;
-  static u64 prev_qc, prev_uc, prev_uh;
-
-  if (prev_qp == queued_paths && prev_pf == pending_favored && 
-      prev_pnf == pending_not_fuzzed && prev_ce == current_entry &&
-      prev_qc == queue_cycle && prev_uc == unique_crashes &&
-      prev_uh == unique_hangs && prev_md == max_depth) return;
-
-  prev_qp  = queued_paths;
-  prev_pf  = pending_favored;
-  prev_pnf = pending_not_fuzzed;
-  prev_ce  = current_entry;
-  prev_qc  = queue_cycle;
-  prev_uc  = unique_crashes;
-  prev_uh  = unique_hangs;
-  prev_md  = max_depth;
-
-  /* Fields in the file:
-
-     unix_time, cycles_done, cur_path, paths_total, paths_not_fuzzed,
-     favored_not_fuzzed, unique_crashes, unique_hangs, max_depth,
-     execs_per_sec */
-
-  fprintf(plot_file, 
-          "%llu, %llu, %u, %u, %u, %u, %0.02f%%, %llu, %llu, %u, %0.02f\n",
-          get_cur_time() / 1000, queue_cycle - 1, current_entry, queued_paths,
-          pending_not_fuzzed, pending_favored, bitmap_cvg, unique_crashes,
-          unique_hangs, max_depth, eps); /* ignore errors */
-
-  fflush(plot_file);
-
-}
-
-
-
-/* A helper function for maybe_delete_out_dir(), deleting all prefixed
-   files in a directory. */
-
-static u8 delete_files(u8* path, u8* prefix) {
-
-  DIR* d;
-  struct dirent* d_ent;
-
-  d = opendir(path);
-
-  if (!d) return 0;
-
-  while ((d_ent = readdir(d))) {
-
-    if (d_ent->d_name[0] != '.' && (!prefix ||
-        !strncmp(d_ent->d_name, prefix, strlen(prefix)))) {
-
-      u8* fname = alloc_printf("%s/%s", path, d_ent->d_name);
-      if (unlink(fname)) PFATAL("Unable to delete '%s'", fname);
-      ck_free(fname);
-
-    }
-
-  }
-
-  closedir(d);
-
-  return !!rmdir(path);
-
-}
-
-
-/* Get the number of runnable processes, with some simple smoothing. */
-
-static double get_runnable_processes(void) {
-
-  static double res;
-
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__)
-
-  /* I don't see any portable sysctl or so that would quickly give us the
-     number of runnable processes; the 1-minute load average can be a
-     semi-decent approximation, though. */
-
-  if (getloadavg(&res, 1) != 1) return 0;
-
-#else
-
-  /* On Linux, /proc/stat is probably the best way; load averages are
-     computed in funny ways and sometimes don't reflect extremely short-lived
-     processes well. */
-
-  FILE* f = fopen("/proc/stat", "r");
-  u8 tmp[1024];
-  u32 val = 0;
-
-  if (!f) return 0;
-
-  while (fgets(tmp, sizeof(tmp), f)) {
-
-    if (!strncmp(tmp, "procs_running ", 14) ||
-        !strncmp(tmp, "procs_blocked ", 14)) val += atoi(tmp + 14);
-
-  }
- 
-  fclose(f);
-
-  if (!res) {
-
-    res = val;
-
-  } else {
-
-    res = res * (1.0 - 1.0 / AVG_SMOOTHING) +
-          ((double)val) * (1.0 / AVG_SMOOTHING);
-
-  }
-
-#endif /* ^(__APPLE__ || __FreeBSD__ || __OpenBSD__) */
-
-  return res;
-
-}
-
-
-/* Delete the temporary directory used for in-place session resume. */
-
-static void nuke_resume_dir(void) {
-
-  u8* fn;
-
-  fn = alloc_printf("%s/_resume/.state/deterministic_done", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/_resume/.state/auto_extras", out_dir);
-  if (delete_files(fn, "auto_")) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/_resume/.state/redundant_edges", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/_resume/.state/variable_behavior", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/_resume/.state", out_dir);
-  if (rmdir(fn) && errno != ENOENT) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/_resume", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  return;
-
-dir_cleanup_failed:
-
-  FATAL("_resume directory cleanup failed");
-
-}
-
-
-/* Delete fuzzer output directory if we recognize it as ours, if the fuzzer
-   is not currently running, and if the last run time isn't too great. */
-
-static void maybe_delete_out_dir(void) {
-
-  FILE* f;
-  u8 *fn = alloc_printf("%s/fuzzer_stats", out_dir);
-
-  /* See if the output directory is locked. If yes, bail out. If not,
-     create a lock that will persist for the lifetime of the process
-     (this requires leaving the descriptor open).*/
-
-  out_dir_fd = open(out_dir, O_RDONLY);
-  if (out_dir_fd < 0) PFATAL("Unable to open '%s'", out_dir);
-
-#ifndef __sun
-
-  if (flock(out_dir_fd, LOCK_EX | LOCK_NB) && errno == EWOULDBLOCK) {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "Looks like the job output directory is being actively used by another\n"
-         "    instance of afl-fuzz. You will need to choose a different %s\n"
-         "    or stop the other process first.\n",
-         sync_id ? "fuzzer ID" : "output location");
-
-    FATAL("Directory '%s' is in use", out_dir);
-
-  }
-
-#endif /* !__sun */
-
-  f = fopen(fn, "r");
-
-  if (f) {
-
-    u64 start_time2, last_update;
-
-    if (fscanf(f, "start_time     : %llu\n"
-                  "last_update    : %llu\n", &start_time2, &last_update) != 2)
-      FATAL("Malformed data in '%s'", fn);
-
-    fclose(f);
-
-    /* Let's see how much work is at stake. */
-
-    if (!in_place_resume && last_update - start_time2 > OUTPUT_GRACE * 60) {
-
-      SAYF("\n" cLRD "[-] " cRST
-           "The job output directory already exists and contains the results of more\n"
-           "    than %d minutes worth of fuzzing. To avoid data loss, afl-fuzz will *NOT*\n"
-           "    automatically delete this data for you.\n\n"
-
-           "    If you wish to start a new session, remove or rename the directory manually,\n"
-           "    or specify a different output location for this job. To resume the old\n"
-           "    session, put '-' as the input directory in the command line ('-i -') and\n"
-           "    try again.\n", OUTPUT_GRACE);
-
-       FATAL("At-risk data found in '%s'", out_dir);
-
-    }
-
-  }
-
-  ck_free(fn);
-
-  /* The idea for in-place resume is pretty simple: we temporarily move the old
-     queue/ to a new location that gets deleted once import to the new queue/
-     is finished. If _resume/ already exists, the current queue/ may be
-     incomplete due to an earlier abort, so we want to use the old _resume/
-     dir instead, and we let rename() fail silently. */
-
-  if (in_place_resume) {
-
-    u8* orig_q = alloc_printf("%s/queue", out_dir);
-
-    in_dir = alloc_printf("%s/_resume", out_dir);
-
-    rename(orig_q, in_dir); /* Ignore errors */
-
-    OKF("Output directory exists, will attempt session resume.");
-
-    ck_free(orig_q);
-
-  } else {
-
-    OKF("Output directory exists but deemed OK to reuse.");
-
-  }
-
-  ACTF("Deleting old session data...");
-
-  /* Okay, let's get the ball rolling! First, we need to get rid of the entries
-     in <out_dir>/.synced/.../id:*, if any are present. */
-
-  if (!in_place_resume) {
-
-    fn = alloc_printf("%s/.synced", out_dir);
-    if (delete_files(fn, NULL)) goto dir_cleanup_failed;
-    ck_free(fn);
-
-  }
-
-  /* Next, we need to clean up <out_dir>/queue/.state/ subdirectories: */
-
-  fn = alloc_printf("%s/queue/.state/deterministic_done", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/queue/.state/auto_extras", out_dir);
-  if (delete_files(fn, "auto_")) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/queue/.state/redundant_edges", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/queue/.state/variable_behavior", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  /* Then, get rid of the .state subdirectory itself (should be empty by now)
-     and everything matching <out_dir>/queue/id:*. */
-
-  fn = alloc_printf("%s/queue/.state", out_dir);
-  if (rmdir(fn) && errno != ENOENT) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/queue", out_dir);
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  /* All right, let's do <out_dir>/crashes/id:* and <out_dir>/hangs/id:*. */
-
-  if (!in_place_resume) {
-
-    fn = alloc_printf("%s/crashes/README.txt", out_dir);
-    unlink(fn); /* Ignore errors */
-    ck_free(fn);
-
-  }
-
-  fn = alloc_printf("%s/crashes", out_dir);
-
-  /* Make backup of the crashes directory if it's not empty and if we're
-     doing in-place resume. */
-
-  if (in_place_resume && rmdir(fn)) {
-
-    time_t cur_t = time(0);
-    struct tm* t = localtime(&cur_t);
-
-#ifndef SIMPLE_FILES
-
-    u8* nfn = alloc_printf("%s.%04d-%02d-%02d-%02d:%02d:%02d", fn,
-                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
-                           t->tm_hour, t->tm_min, t->tm_sec);
-
-#else
-
-    u8* nfn = alloc_printf("%s_%04d%02d%02d%02d%02d%02d", fn,
-                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
-                           t->tm_hour, t->tm_min, t->tm_sec);
-
-#endif /* ^!SIMPLE_FILES */
-
-    rename(fn, nfn); /* Ignore errors. */
-    ck_free(nfn);
-
-  }
-
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/hangs", out_dir);
-
-  /* Backup hangs, too. */
-
-  if (in_place_resume && rmdir(fn)) {
-
-    time_t cur_t = time(0);
-    struct tm* t = localtime(&cur_t);
-
-#ifndef SIMPLE_FILES
-
-    u8* nfn = alloc_printf("%s.%04d-%02d-%02d-%02d:%02d:%02d", fn,
-                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
-                           t->tm_hour, t->tm_min, t->tm_sec);
-
-#else
-
-    u8* nfn = alloc_printf("%s_%04d%02d%02d%02d%02d%02d", fn,
-                           t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
-                           t->tm_hour, t->tm_min, t->tm_sec);
-
-#endif /* ^!SIMPLE_FILES */
-
-    rename(fn, nfn); /* Ignore errors. */
-    ck_free(nfn);
-
-  }
-
-  if (delete_files(fn, CASE_PREFIX)) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  /* And now, for some finishing touches. */
-
-  if (file_extension) {
-    fn = alloc_printf("%s/.cur_input.%s", out_dir, file_extension);
-  } else {
-    fn = alloc_printf("%s/.cur_input", out_dir);
-  }
-
-  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/fuzz_bitmap", out_dir);
-  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  if (!in_place_resume) {
-    fn  = alloc_printf("%s/fuzzer_stats", out_dir);
-    if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
-    ck_free(fn);
-  }
-
-  fn = alloc_printf("%s/plot_data", out_dir);
-  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  fn = alloc_printf("%s/cmdline", out_dir);
-  if (unlink(fn) && errno != ENOENT) goto dir_cleanup_failed;
-  ck_free(fn);
-
-  OKF("Output dir cleanup successful.");
-
-  /* Wow... is that all? If yes, celebrate! */
-
-  return;
-
-dir_cleanup_failed:
-
-  SAYF("\n" cLRD "[-] " cRST
-       "Whoops, the fuzzer tried to reuse your output directory, but bumped into\n"
-       "    some files that shouldn't be there or that couldn't be removed - so it\n"
-       "    decided to abort! This happened while processing this path:\n\n"
-
-       "    %s\n\n"
-       "    Please examine and manually delete the files, or specify a different\n"
-       "    output location for the tool.\n", fn);
-
-  FATAL("Output directory cleanup failed");
-
-}
-
-
-static void check_term_size(void);
-
-
-/* A spiffy retro stats screen! This is called every stats_update_freq
-   execve() calls, plus in several other circumstances. */
-
-static void show_stats(void) {
-
-  static u64 last_stats_ms, last_plot_ms, last_ms, last_execs;
-  static double avg_exec;
-  double t_byte_ratio, stab_ratio;
-
-  u64 cur_ms;
-  u32 t_bytes, t_bits;
-
-  u32 banner_len, banner_pad;
-  u8  tmp[256];
-
-  cur_ms = get_cur_time();
-
-  /* If not enough time has passed since last UI update, bail out. */
-
-  if (cur_ms - last_ms < 1000 / UI_TARGET_HZ) return;
-
-  /* Check if we're past the 10 minute mark. */
-
-  if (cur_ms - start_time > 10 * 60 * 1000) run_over10m = 1;
-
-  /* Calculate smoothed exec speed stats. */
-
-  if (!last_execs) {
-
-    avg_exec = ((double)total_execs) * 1000 / (cur_ms - start_time);
-
-  } else {
-
-    double cur_avg = ((double)(total_execs - last_execs)) * 1000 /
-                     (cur_ms - last_ms);
-
-    /* If there is a dramatic (5x+) jump in speed, reset the indicator
-       more quickly. */
-
-    if (cur_avg * 5 < avg_exec || cur_avg / 5 > avg_exec)
-      avg_exec = cur_avg;
-
-    avg_exec = avg_exec * (1.0 - 1.0 / AVG_SMOOTHING) +
-               cur_avg * (1.0 / AVG_SMOOTHING);
-
-  }
-
-  last_ms = cur_ms;
-  last_execs = total_execs;
-
-  /* Tell the callers when to contact us (as measured in execs). */
-
-  stats_update_freq = avg_exec / (UI_TARGET_HZ * 10);
-  if (!stats_update_freq) stats_update_freq = 1;
-
-  /* Do some bitmap stats. */
-
-  t_bytes = count_non_255_bytes(virgin_bits);
-  t_byte_ratio = ((double)t_bytes * 100) / MAP_SIZE;
-
-  if (t_bytes)
-    stab_ratio = 100 - ((double)var_byte_count) * 100 / t_bytes;
-  else
-    stab_ratio = 100;
-
-  /* Roughly every minute, update fuzzer stats and save auto tokens. */
-
-  if (cur_ms - last_stats_ms > STATS_UPDATE_SEC * 1000) {
-
-    last_stats_ms = cur_ms;
-    write_stats_file(t_byte_ratio, stab_ratio, avg_exec);
-    save_auto();
-    write_bitmap();
-
-  }
-
-  /* Every now and then, write plot data. */
-
-  if (cur_ms - last_plot_ms > PLOT_UPDATE_SEC * 1000) {
-
-    last_plot_ms = cur_ms;
-    maybe_update_plot_file(t_byte_ratio, avg_exec);
-
-  }
-
-  /* Honor AFL_EXIT_WHEN_DONE and AFL_BENCH_UNTIL_CRASH. */
-
-  if (!dumb_mode && cycles_wo_finds > 100 && !pending_not_fuzzed &&
-      getenv("AFL_EXIT_WHEN_DONE")) stop_soon = 2;
-
-  if (total_crashes && getenv("AFL_BENCH_UNTIL_CRASH")) stop_soon = 2;
-
-  /* If we're not on TTY, bail out. */
-
-  if (not_on_tty) return;
-
-  /* Compute some mildly useful bitmap stats. */
-
-  t_bits = (MAP_SIZE << 3) - count_bits(virgin_bits);
-
-  /* Now, for the visuals... */
-
-  if (clear_screen) {
-
-    SAYF(TERM_CLEAR CURSOR_HIDE);
-    clear_screen = 0;
-
-    check_term_size();
-
-  }
-
-  SAYF(TERM_HOME);
-
-  if (term_too_small) {
-
-    SAYF(cBRI "Your terminal is too small to display the UI.\n"
-         "Please resize terminal window to at least 79x24.\n" cRST);
-
-    return;
-
-  }
-
-  /* Let's start by drawing a centered banner. */
-
-  banner_len = (crash_mode ? 24 : 22) + strlen(VERSION) + strlen(use_banner) + strlen(power_name) + 3 + 5;
-  banner_pad = (79 - banner_len) / 2;
-  memset(tmp, ' ', banner_pad);
-
-#ifdef HAVE_AFFINITY
-  sprintf(tmp + banner_pad, "%s " cLCY VERSION cLGN
-          " (%s) " cPIN "[%s]" cBLU " {%d}",  crash_mode ? cPIN "peruvian were-rabbit" :
-          cYEL "american fuzzy lop", use_banner, power_name, cpu_aff);
-#else
-  sprintf(tmp + banner_pad, "%s " cLCY VERSION cLGN
-          " (%s) " cPIN "[%s]",  crash_mode ? cPIN "peruvian were-rabbit" :
-          cYEL "american fuzzy lop", use_banner, power_name);
-#endif /* HAVE_AFFINITY */
-
-  SAYF("\n%s\n", tmp);
-
-  /* "Handy" shortcuts for drawing boxes... */
-
-#define bSTG    bSTART cGRA
-#define bH2     bH bH
-#define bH5     bH2 bH2 bH
-#define bH10    bH5 bH5
-#define bH20    bH10 bH10
-#define bH30    bH20 bH10
-#define SP5     "     "
-#define SP10    SP5 SP5
-#define SP20    SP10 SP10
-
-  /* Lord, forgive me this. */
-
-  SAYF(SET_G1 bSTG bLT bH bSTOP cCYA " process timing " bSTG bH30 bH5 bH bHB
-       bH bSTOP cCYA " overall results " bSTG bH2 bH2 bRT "\n");
-
-  if (dumb_mode) {
-
-    strcpy(tmp, cRST);
-
-  } else {
-
-    u64 min_wo_finds = (cur_ms - last_path_time) / 1000 / 60;
-
-    /* First queue cycle: don't stop now! */
-    if (queue_cycle == 1 || min_wo_finds < 15) strcpy(tmp, cMGN); else
-
-    /* Subsequent cycles, but we're still making finds. */
-    if (cycles_wo_finds < 25 || min_wo_finds < 30) strcpy(tmp, cYEL); else
-
-    /* No finds for a long time and no test cases to try. */
-    if (cycles_wo_finds > 100 && !pending_not_fuzzed && min_wo_finds > 120)
-      strcpy(tmp, cLGN);
-
-    /* Default: cautiously OK to stop? */
-    else strcpy(tmp, cLBL);
-
-  }
-
-  SAYF(bV bSTOP "        run time : " cRST "%-33s " bSTG bV bSTOP
-       "  cycles done : %s%-5s " bSTG bV "\n",
-       DTD(cur_ms, start_time), tmp, DI(queue_cycle - 1));
-
-  /* We want to warn people about not seeing new paths after a full cycle,
-     except when resuming fuzzing or running in non-instrumented mode. */
-
-  if (!dumb_mode && (last_path_time || resuming_fuzz || queue_cycle == 1 ||
-      in_bitmap || crash_mode)) {
-
-    SAYF(bV bSTOP "   last new path : " cRST "%-33s ",
-         DTD(cur_ms, last_path_time));
-
-  } else {
-
-    if (dumb_mode)
-
-      SAYF(bV bSTOP "   last new path : " cPIN "n/a" cRST
-           " (non-instrumented mode)       ");
-
-     else
-
-      SAYF(bV bSTOP "   last new path : " cRST "none yet " cLRD
-           "(odd, check syntax!)     ");
-
-  }
-
-  SAYF(bSTG bV bSTOP "  total paths : " cRST "%-5s " bSTG bV "\n",
-       DI(queued_paths));
-
-  /* Highlight crashes in red if found, denote going over the KEEP_UNIQUE_CRASH
-     limit with a '+' appended to the count. */
-
-  sprintf(tmp, "%s%s", DI(unique_crashes),
-          (unique_crashes >= KEEP_UNIQUE_CRASH) ? "+" : "");
-
-  SAYF(bV bSTOP " last uniq crash : " cRST "%-33s " bSTG bV bSTOP
-       " uniq crashes : %s%-6s" bSTG bV "\n",
-       DTD(cur_ms, last_crash_time), unique_crashes ? cLRD : cRST,
-       tmp);
-
-  sprintf(tmp, "%s%s", DI(unique_hangs),
-         (unique_hangs >= KEEP_UNIQUE_HANG) ? "+" : "");
-
-  SAYF(bV bSTOP "  last uniq hang : " cRST "%-33s " bSTG bV bSTOP
-       "   uniq hangs : " cRST "%-6s" bSTG bV "\n",
-       DTD(cur_ms, last_hang_time), tmp);
-
-  SAYF(bVR bH bSTOP cCYA " cycle progress " bSTG bH10 bH5 bH2 bH2 bHB bH bSTOP cCYA
-       " map coverage " bSTG bH bHT bH20 bH2 bVL "\n");
-
-  /* This gets funny because we want to print several variable-length variables
-     together, but then cram them into a fixed-width field - so we need to
-     put them in a temporary buffer first. */
-
-  sprintf(tmp, "%s%s%u (%0.02f%%)", DI(current_entry),
-          queue_cur->favored ? "." : "*", queue_cur->fuzz_level,
-          ((double)current_entry * 100) / queued_paths);
-
-  SAYF(bV bSTOP "  now processing : " cRST "%-16s " bSTG bV bSTOP, tmp);
-
-  sprintf(tmp, "%0.02f%% / %0.02f%%", ((double)queue_cur->bitmap_size) *
-          100 / MAP_SIZE, t_byte_ratio);
-
-  SAYF("    map density : %s%-21s" bSTG bV "\n", t_byte_ratio > 70 ? cLRD :
-       ((t_bytes < 200 && !dumb_mode) ? cPIN : cRST), tmp);
-
-  sprintf(tmp, "%s (%0.02f%%)", DI(cur_skipped_paths),
-          ((double)cur_skipped_paths * 100) / queued_paths);
-
-  SAYF(bV bSTOP " paths timed out : " cRST "%-16s " bSTG bV, tmp);
-
-  sprintf(tmp, "%0.02f bits/tuple",
-          t_bytes ? (((double)t_bits) / t_bytes) : 0);
-
-  SAYF(bSTOP " count coverage : " cRST "%-21s" bSTG bV "\n", tmp);
-
-  SAYF(bVR bH bSTOP cCYA " stage progress " bSTG bH10 bH5 bH2 bH2 bX bH bSTOP cCYA
-       " findings in depth " bSTG bH10 bH5 bH2 bH2 bVL "\n");
-
-  sprintf(tmp, "%s (%0.02f%%)", DI(queued_favored),
-          ((double)queued_favored) * 100 / queued_paths);
-
-  /* Yeah... it's still going on... halp? */
-
-  SAYF(bV bSTOP "  now trying : " cRST "%-20s " bSTG bV bSTOP
-       " favored paths : " cRST "%-22s" bSTG bV "\n", stage_name, tmp);
-
-  if (!stage_max) {
-
-    sprintf(tmp, "%s/-", DI(stage_cur));
-
-  } else {
-
-    sprintf(tmp, "%s/%s (%0.02f%%)", DI(stage_cur), DI(stage_max),
-            ((double)stage_cur) * 100 / stage_max);
-
-  }
-
-  SAYF(bV bSTOP " stage execs : " cRST "%-20s " bSTG bV bSTOP, tmp);
-
-  sprintf(tmp, "%s (%0.02f%%)", DI(queued_with_cov),
-          ((double)queued_with_cov) * 100 / queued_paths);
-
-  SAYF("  new edges on : " cRST "%-22s" bSTG bV "\n", tmp);
-
-  sprintf(tmp, "%s (%s%s unique)", DI(total_crashes), DI(unique_crashes),
-          (unique_crashes >= KEEP_UNIQUE_CRASH) ? "+" : "");
-
-  if (crash_mode) {
-
-    SAYF(bV bSTOP " total execs : " cRST "%-20s " bSTG bV bSTOP
-         "   new crashes : %s%-22s" bSTG bV "\n", DI(total_execs),
-         unique_crashes ? cLRD : cRST, tmp);
-
-  } else {
-
-    SAYF(bV bSTOP " total execs : " cRST "%-20s " bSTG bV bSTOP
-         " total crashes : %s%-22s" bSTG bV "\n", DI(total_execs),
-         unique_crashes ? cLRD : cRST, tmp);
-
-  }
-
-  /* Show a warning about slow execution. */
-
-  if (avg_exec < 100) {
-
-    sprintf(tmp, "%s/sec (%s)", DF(avg_exec), avg_exec < 20 ?
-            "zzzz..." : "slow!");
-
-    SAYF(bV bSTOP "  exec speed : " cLRD "%-20s ", tmp);
-
-  } else {
-
-    sprintf(tmp, "%s/sec", DF(avg_exec));
-    SAYF(bV bSTOP "  exec speed : " cRST "%-20s ", tmp);
-
-  }
-
-  sprintf(tmp, "%s (%s%s unique)", DI(total_tmouts), DI(unique_tmouts),
-          (unique_hangs >= KEEP_UNIQUE_HANG) ? "+" : "");
-
-  SAYF (bSTG bV bSTOP "  total tmouts : " cRST "%-22s" bSTG bV "\n", tmp);
-
-  /* Aaaalmost there... hold on! */
-
-  SAYF(bVR bH cCYA bSTOP " fuzzing strategy yields " bSTG bH10 bHT bH10
-       bH5 bHB bH bSTOP cCYA " path geometry " bSTG bH5 bH2 bVL "\n");
-
-  if (skip_deterministic) {
-
-    strcpy(tmp, "n/a, n/a, n/a");
-
-  } else {
-
-    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
-            DI(stage_finds[STAGE_FLIP1]), DI(stage_cycles[STAGE_FLIP1]),
-            DI(stage_finds[STAGE_FLIP2]), DI(stage_cycles[STAGE_FLIP2]),
-            DI(stage_finds[STAGE_FLIP4]), DI(stage_cycles[STAGE_FLIP4]));
-
-  }
-
-  SAYF(bV bSTOP "   bit flips : " cRST "%-36s " bSTG bV bSTOP "    levels : "
-       cRST "%-10s" bSTG bV "\n", tmp, DI(max_depth));
-
-  if (!skip_deterministic)
-    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
-            DI(stage_finds[STAGE_FLIP8]), DI(stage_cycles[STAGE_FLIP8]),
-            DI(stage_finds[STAGE_FLIP16]), DI(stage_cycles[STAGE_FLIP16]),
-            DI(stage_finds[STAGE_FLIP32]), DI(stage_cycles[STAGE_FLIP32]));
-
-  SAYF(bV bSTOP "  byte flips : " cRST "%-36s " bSTG bV bSTOP "   pending : "
-       cRST "%-10s" bSTG bV "\n", tmp, DI(pending_not_fuzzed));
-
-  if (!skip_deterministic)
-    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
-            DI(stage_finds[STAGE_ARITH8]), DI(stage_cycles[STAGE_ARITH8]),
-            DI(stage_finds[STAGE_ARITH16]), DI(stage_cycles[STAGE_ARITH16]),
-            DI(stage_finds[STAGE_ARITH32]), DI(stage_cycles[STAGE_ARITH32]));
-
-  SAYF(bV bSTOP " arithmetics : " cRST "%-36s " bSTG bV bSTOP "  pend fav : "
-       cRST "%-10s" bSTG bV "\n", tmp, DI(pending_favored));
-
-  if (!skip_deterministic)
-    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
-            DI(stage_finds[STAGE_INTEREST8]), DI(stage_cycles[STAGE_INTEREST8]),
-            DI(stage_finds[STAGE_INTEREST16]), DI(stage_cycles[STAGE_INTEREST16]),
-            DI(stage_finds[STAGE_INTEREST32]), DI(stage_cycles[STAGE_INTEREST32]));
-
-  SAYF(bV bSTOP "  known ints : " cRST "%-36s " bSTG bV bSTOP " own finds : "
-       cRST "%-10s" bSTG bV "\n", tmp, DI(queued_discovered));
-
-  if (!skip_deterministic)
-    sprintf(tmp, "%s/%s, %s/%s, %s/%s",
-            DI(stage_finds[STAGE_EXTRAS_UO]), DI(stage_cycles[STAGE_EXTRAS_UO]),
-            DI(stage_finds[STAGE_EXTRAS_UI]), DI(stage_cycles[STAGE_EXTRAS_UI]),
-            DI(stage_finds[STAGE_EXTRAS_AO]), DI(stage_cycles[STAGE_EXTRAS_AO]));
-
-  SAYF(bV bSTOP "  dictionary : " cRST "%-36s " bSTG bV bSTOP
-       "  imported : " cRST "%-10s" bSTG bV "\n", tmp,
-       sync_id ? DI(queued_imported) : (u8*)"n/a");
-
-  sprintf(tmp, "%s/%s, %s/%s, %s/%s",
-          DI(stage_finds[STAGE_HAVOC]), DI(stage_cycles[STAGE_HAVOC]),
-          DI(stage_finds[STAGE_SPLICE]), DI(stage_cycles[STAGE_SPLICE]),
-          DI(stage_finds[STAGE_PYTHON]), DI(stage_cycles[STAGE_PYTHON]));
-
-  SAYF(bV bSTOP "       havoc : " cRST "%-36s " bSTG bV bSTOP, tmp);
-
-  if (t_bytes) sprintf(tmp, "%0.02f%%", stab_ratio);
-    else strcpy(tmp, "n/a");
-
-  SAYF(" stability : %s%-10s" bSTG bV "\n", (stab_ratio < 85 && var_byte_count > 40)
-       ? cLRD : ((queued_variable && (!persistent_mode || var_byte_count > 20))
-       ? cMGN : cRST), tmp);
-
-  if (!bytes_trim_out) {
-
-    sprintf(tmp, "n/a, ");
-
-  } else {
-
-    sprintf(tmp, "%0.02f%%/%s, ",
-            ((double)(bytes_trim_in - bytes_trim_out)) * 100 / bytes_trim_in,
-            DI(trim_execs));
-
-  }
-
-  if (!blocks_eff_total) {
-
-    u8 tmp2[128];
-
-    sprintf(tmp2, "n/a");
-    strcat(tmp, tmp2);
-
-  } else {
-
-    u8 tmp2[128];
-
-    sprintf(tmp2, "%0.02f%%",
-            ((double)(blocks_eff_total - blocks_eff_select)) * 100 /
-            blocks_eff_total);
-
-    strcat(tmp, tmp2);
-
-  }
-  if (custom_mutator) {
-    sprintf(tmp, "%s/%s", DI(stage_finds[STAGE_CUSTOM_MUTATOR]), DI(stage_cycles[STAGE_CUSTOM_MUTATOR]));
-    SAYF(bV bSTOP " custom mut. : " cRST "%-36s " bSTG bVR bH20 bH2 bH bRB "\n"
-             bLB bH30 bH20 bH2 bH bRB bSTOP cRST RESET_G1, tmp);
-  } else {
-    SAYF(bV bSTOP "        trim : " cRST "%-36s " bSTG bVR bH20 bH2 bH bRB "\n"
-       bLB bH30 bH20 bH2 bRB bSTOP cRST RESET_G1, tmp);
-  }
-
-  /* Provide some CPU utilization stats. */
-
-  if (cpu_core_count) {
-
-    double cur_runnable = get_runnable_processes();
-    u32 cur_utilization = cur_runnable * 100 / cpu_core_count;
-
-    u8* cpu_color = cCYA;
-
-    /* If we could still run one or more processes, use green. */
-
-    if (cpu_core_count > 1 && cur_runnable + 1 <= cpu_core_count)
-      cpu_color = cLGN;
-
-    /* If we're clearly oversubscribed, use red. */
-
-    if (!no_cpu_meter_red && cur_utilization >= 150) cpu_color = cLRD;
-
-#ifdef HAVE_AFFINITY
-
-    if (cpu_aff >= 0) {
-
-      SAYF(SP10 cGRA "[cpu%03u:%s%3u%%" cGRA "]\r" cRST, 
-           MIN(cpu_aff, 999), cpu_color,
-           MIN(cur_utilization, 999));
-
-    } else {
-
-      SAYF(SP10 cGRA "   [cpu:%s%3u%%" cGRA "]\r" cRST,
-           cpu_color, MIN(cur_utilization, 999));
- 
-   }
-
-#else
-
-    SAYF(SP10 cGRA "   [cpu:%s%3u%%" cGRA "]\r" cRST,
-         cpu_color, MIN(cur_utilization, 999));
-
-#endif /* ^HAVE_AFFINITY */
-
-  } else SAYF("\r");
-
-  /* Hallelujah! */
-
-  fflush(0);
-
-}
-
-
-/* Display quick statistics at the end of processing the input directory,
-   plus a bunch of warnings. Some calibration stuff also ended up here,
-   along with several hardcoded constants. Maybe clean up eventually. */
-
-static void show_init_stats(void) {
-
-  struct queue_entry* q = queue;
-  u32 min_bits = 0, max_bits = 0;
-  u64 min_us = 0, max_us = 0;
-  u64 avg_us = 0;
-  u32 max_len = 0;
-
-  if (total_cal_cycles) avg_us = total_cal_us / total_cal_cycles;
-
-  while (q) {
-
-    if (!min_us || q->exec_us < min_us) min_us = q->exec_us;
-    if (q->exec_us > max_us) max_us = q->exec_us;
-
-    if (!min_bits || q->bitmap_size < min_bits) min_bits = q->bitmap_size;
-    if (q->bitmap_size > max_bits) max_bits = q->bitmap_size;
-
-    if (q->len > max_len) max_len = q->len;
-
-    q = q->next;
-
-  }
-
-  SAYF("\n");
-
-  if (avg_us > ((qemu_mode || unicorn_mode) ? 50000 : 10000))
-    WARNF(cLRD "The target binary is pretty slow! See %s/perf_tips.txt.",
-          doc_path);
-
-  /* Let's keep things moving with slow binaries. */
-
-  if (avg_us > 50000) havoc_div = 10;     /* 0-19 execs/sec   */
-  else if (avg_us > 20000) havoc_div = 5; /* 20-49 execs/sec  */
-  else if (avg_us > 10000) havoc_div = 2; /* 50-100 execs/sec */
-
-  if (!resuming_fuzz) {
-
-    if (max_len > 50 * 1024)
-      WARNF(cLRD "Some test cases are huge (%s) - see %s/perf_tips.txt!",
-            DMS(max_len), doc_path);
-    else if (max_len > 10 * 1024)
-      WARNF("Some test cases are big (%s) - see %s/perf_tips.txt.",
-            DMS(max_len), doc_path);
-
-    if (useless_at_start && !in_bitmap)
-      WARNF(cLRD "Some test cases look useless. Consider using a smaller set.");
-
-    if (queued_paths > 100)
-      WARNF(cLRD "You probably have far too many input files! Consider trimming down.");
-    else if (queued_paths > 20)
-      WARNF("You have lots of input files; try starting small.");
-
-  }
-
-  OKF("Here are some useful stats:\n\n"
-
-      cGRA "    Test case count : " cRST "%u favored, %u variable, %u total\n"
-      cGRA "       Bitmap range : " cRST "%u to %u bits (average: %0.02f bits)\n"
-      cGRA "        Exec timing : " cRST "%s to %s us (average: %s us)\n",
-      queued_favored, queued_variable, queued_paths, min_bits, max_bits, 
-      ((double)total_bitmap_size) / (total_bitmap_entries ? total_bitmap_entries : 1),
-      DI(min_us), DI(max_us), DI(avg_us));
-
-  if (!timeout_given) {
-
-    /* Figure out the appropriate timeout. The basic idea is: 5x average or
-       1x max, rounded up to EXEC_TM_ROUND ms and capped at 1 second.
-
-       If the program is slow, the multiplier is lowered to 2x or 3x, because
-       random scheduler jitter is less likely to have any impact, and because
-       our patience is wearing thin =) */
-
-    if (avg_us > 50000) exec_tmout = avg_us * 2 / 1000;
-    else if (avg_us > 10000) exec_tmout = avg_us * 3 / 1000;
-    else exec_tmout = avg_us * 5 / 1000;
-
-    exec_tmout = MAX(exec_tmout, max_us / 1000);
-    exec_tmout = (exec_tmout + EXEC_TM_ROUND) / EXEC_TM_ROUND * EXEC_TM_ROUND;
-
-    if (exec_tmout > EXEC_TIMEOUT) exec_tmout = EXEC_TIMEOUT;
-
-    ACTF("No -t option specified, so I'll use exec timeout of %u ms.", 
-         exec_tmout);
-
-    timeout_given = 1;
-
-  } else if (timeout_given == 3) {
-
-    ACTF("Applying timeout settings from resumed session (%u ms).", exec_tmout);
-
-  }
-
-  /* In dumb mode, re-running every timing out test case with a generous time
-     limit is very expensive, so let's select a more conservative default. */
-
-  if (dumb_mode && !getenv("AFL_HANG_TMOUT"))
-    hang_tmout = MIN(EXEC_TIMEOUT, exec_tmout * 2 + 100);
-
-  OKF("All set and ready to roll!");
-
-}
-
-
-#ifdef USE_PYTHON
-static u8 trim_case_python(char** argv, struct queue_entry* q, u8* in_buf) {
-
-  static u8 tmp[64];
-  static u8 clean_trace[MAP_SIZE];
-
-  u8  needs_write = 0, fault = 0;
-  u32 trim_exec = 0;
-  u32 orig_len = q->len;
-
-  stage_name = tmp;
-  bytes_trim_in += q->len;
-
-  /* Initialize trimming in the Python module */
-  stage_cur = 0;
-  stage_max = init_trim_py(in_buf, q->len);
-
-  if (not_on_tty && debug)
-    SAYF("[Python Trimming] START: Max %d iterations, %u bytes", stage_max, q->len);
-
-  while(stage_cur < stage_max) {
-    sprintf(tmp, "ptrim %s", DI(trim_exec));
-
-    u32 cksum;
-
-    char* retbuf = NULL;
-    size_t retlen = 0;
-
-    trim_py(&retbuf, &retlen);
-
-    if (retlen > orig_len)
-      FATAL("Trimmed data returned by Python module is larger than original data");
-
-    write_to_testcase(retbuf, retlen);
-
-    fault = run_target(argv, exec_tmout);
-    ++trim_execs;
-
-    if (stop_soon || fault == FAULT_ERROR) goto abort_trimming;
-
-    cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-    if (cksum == q->exec_cksum) {
-
-      q->len = retlen;
-      memcpy(in_buf, retbuf, retlen);
-
-      /* Let's save a clean trace, which will be needed by
-         update_bitmap_score once we're done with the trimming stuff. */
-
-      if (!needs_write) {
-
-        needs_write = 1;
-        memcpy(clean_trace, trace_bits, MAP_SIZE);
-
-      }
-
-      /* Tell the Python module that the trimming was successful */
-      stage_cur = post_trim_py(1);
-
-      if (not_on_tty && debug)
-        SAYF("[Python Trimming] SUCCESS: %d/%d iterations (now at %u bytes)", stage_cur, stage_max, q->len);
-    } else {
-      /* Tell the Python module that the trimming was unsuccessful */
-      stage_cur = post_trim_py(0);
-      if (not_on_tty && debug)
-        SAYF("[Python Trimming] FAILURE: %d/%d iterations", stage_cur, stage_max);
-    }
-
-      /* Since this can be slow, update the screen every now and then. */
-
-      if (!(trim_exec++ % stats_update_freq)) show_stats();
-  }
-
-  if (not_on_tty && debug)
-    SAYF("[Python Trimming] DONE: %u bytes -> %u bytes", orig_len, q->len);
-
-  /* If we have made changes to in_buf, we also need to update the on-disk
-     version of the test case. */
-
-  if (needs_write) {
-
-    s32 fd;
-
-    unlink(q->fname); /* ignore errors */
-
-    fd = open(q->fname, O_WRONLY | O_CREAT | O_EXCL, 0600);
-
-    if (fd < 0) PFATAL("Unable to create '%s'", q->fname);
-
-    ck_write(fd, in_buf, q->len, q->fname);
-    close(fd);
-
-    memcpy(trace_bits, clean_trace, MAP_SIZE);
-    update_bitmap_score(q);
-
-  }
-
-
-
-abort_trimming:
-
-  bytes_trim_out += q->len;
-  return fault;
-
-}
-#endif
-
-/* Trim all new test cases to save cycles when doing deterministic checks. The
-   trimmer uses power-of-two increments somewhere between 1/16 and 1/1024 of
-   file size, to keep the stage short and sweet. */
-
-static u8 trim_case(char** argv, struct queue_entry* q, u8* in_buf) {
-
-#ifdef USE_PYTHON
-  if (py_functions[PY_FUNC_TRIM])
-    return trim_case_python(argv, q, in_buf);
-#endif
-
-  static u8 tmp[64];
-  static u8 clean_trace[MAP_SIZE];
-
-  u8  needs_write = 0, fault = 0;
-  u32 trim_exec = 0;
-  u32 remove_len;
-  u32 len_p2;
-
-  /* Although the trimmer will be less useful when variable behavior is
-     detected, it will still work to some extent, so we don't check for
-     this. */
-
-  if (q->len < 5) return 0;
-
-  stage_name = tmp;
-  bytes_trim_in += q->len;
-
-  /* Select initial chunk len, starting with large steps. */
-
-  len_p2 = next_p2(q->len);
-
-  remove_len = MAX(len_p2 / TRIM_START_STEPS, TRIM_MIN_BYTES);
-
-  /* Continue until the number of steps gets too high or the stepover
-     gets too small. */
-
-  while (remove_len >= MAX(len_p2 / TRIM_END_STEPS, TRIM_MIN_BYTES)) {
-
-    u32 remove_pos = remove_len;
-
-    sprintf(tmp, "trim %s/%s", DI(remove_len), DI(remove_len));
-
-    stage_cur = 0;
-    stage_max = q->len / remove_len;
-
-    while (remove_pos < q->len) {
-
-      u32 trim_avail = MIN(remove_len, q->len - remove_pos);
-      u32 cksum;
-
-      write_with_gap(in_buf, q->len, remove_pos, trim_avail);
-
-      fault = run_target(argv, exec_tmout);
-      ++trim_execs;
-
-      if (stop_soon || fault == FAULT_ERROR) goto abort_trimming;
-
-      /* Note that we don't keep track of crashes or hangs here; maybe TODO? */
-
-      cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-      /* If the deletion had no impact on the trace, make it permanent. This
-         isn't perfect for variable-path inputs, but we're just making a
-         best-effort pass, so it's not a big deal if we end up with false
-         negatives every now and then. */
-
-      if (cksum == q->exec_cksum) {
-
-        u32 move_tail = q->len - remove_pos - trim_avail;
-
-        q->len -= trim_avail;
-        len_p2  = next_p2(q->len);
-
-        memmove(in_buf + remove_pos, in_buf + remove_pos + trim_avail, 
-                move_tail);
-
-        /* Let's save a clean trace, which will be needed by
-           update_bitmap_score once we're done with the trimming stuff. */
-
-        if (!needs_write) {
-
-          needs_write = 1;
-          memcpy(clean_trace, trace_bits, MAP_SIZE);
-
-        }
-
-      } else remove_pos += remove_len;
-
-      /* Since this can be slow, update the screen every now and then. */
-
-      if (!(trim_exec++ % stats_update_freq)) show_stats();
-      ++stage_cur;
-
-    }
-
-    remove_len >>= 1;
-
-  }
-
-  /* If we have made changes to in_buf, we also need to update the on-disk
-     version of the test case. */
-
-  if (needs_write) {
-
-    s32 fd;
-
-    unlink(q->fname); /* ignore errors */
-
-    fd = open(q->fname, O_WRONLY | O_CREAT | O_EXCL, 0600);
-
-    if (fd < 0) PFATAL("Unable to create '%s'", q->fname);
-
-    ck_write(fd, in_buf, q->len, q->fname);
-    close(fd);
-
-    memcpy(trace_bits, clean_trace, MAP_SIZE);
-    update_bitmap_score(q);
-
-  }
-
-abort_trimming:
-
-  bytes_trim_out += q->len;
-  return fault;
-
-}
-
-
-/* Write a modified test case, run program, process results. Handle
-   error conditions, returning 1 if it's time to bail out. This is
-   a helper function for fuzz_one(). */
-
-u8 common_fuzz_stuff(char** argv, u8* out_buf, u32 len) {
-
-  u8 fault;
-
-  if (post_handler) {
-
-    out_buf = post_handler(out_buf, &len);
-    if (!out_buf || !len) return 0;
-
-  }
-
-  write_to_testcase(out_buf, len);
-
-  fault = run_target(argv, exec_tmout);
-
-  if (stop_soon) return 1;
-
-  if (fault == FAULT_TMOUT) {
-
-    if (subseq_tmouts++ > TMOUT_LIMIT) {
-      ++cur_skipped_paths;
-      return 1;
-    }
-
-  } else subseq_tmouts = 0;
-
-  /* Users can hit us with SIGUSR1 to request the current input
-     to be abandoned. */
-
-  if (skip_requested) {
-
-     skip_requested = 0;
-     ++cur_skipped_paths;
-     return 1;
-
-  }
-
-  /* This handles FAULT_ERROR for us: */
-
-  queued_discovered += save_if_interesting(argv, out_buf, len, fault);
-
-  if (!(stage_cur % stats_update_freq) || stage_cur + 1 == stage_max)
-    show_stats();
-
-  return 0;
-
-}
-
-
-/* Helper to choose random block len for block operations in fuzz_one().
-   Doesn't return zero, provided that max_len is > 0. */
-
-static u32 choose_block_len(u32 limit) {
-
-  u32 min_value, max_value;
-  u32 rlim = MIN(queue_cycle, 3);
-
-  if (!run_over10m) rlim = 1;
-
-  switch (UR(rlim)) {
-
-    case 0:  min_value = 1;
-             max_value = HAVOC_BLK_SMALL;
-             break;
-
-    case 1:  min_value = HAVOC_BLK_SMALL;
-             max_value = HAVOC_BLK_MEDIUM;
-             break;
-
-    default: 
-
-             if (UR(10)) {
-
-               min_value = HAVOC_BLK_MEDIUM;
-               max_value = HAVOC_BLK_LARGE;
-
-             } else {
-
-               min_value = HAVOC_BLK_LARGE;
-               max_value = HAVOC_BLK_XL;
-
-             }
-
-  }
-
-  if (min_value >= limit) min_value = 1;
-
-  return min_value + UR(MIN(max_value, limit) - min_value + 1);
-
-}
-
-
-/* Calculate case desirability score to adjust the length of havoc fuzzing.
-   A helper function for fuzz_one(). Maybe some of these constants should
-   go into config.h. */
-
-static u32 calculate_score(struct queue_entry* q) {
-
-  u32 avg_exec_us = total_cal_us / total_cal_cycles;
-  u32 avg_bitmap_size = total_bitmap_size / total_bitmap_entries;
-  u32 perf_score = 100;
-
-  /* Adjust score based on execution speed of this path, compared to the
-     global average. Multiplier ranges from 0.1x to 3x. Fast inputs are
-     less expensive to fuzz, so we're giving them more air time. */
-
-  // TODO BUG FIXME: is this really a good idea?
-  // This sounds like looking for lost keys under a street light just because
-  // the light is better there.
-  // Longer execution time means longer work on the input, the deeper in
-  // coverage, the better the fuzzing, right? -mh
-
-  if (q->exec_us * 0.1 > avg_exec_us) perf_score = 10;
-  else if (q->exec_us * 0.25 > avg_exec_us) perf_score = 25;
-  else if (q->exec_us * 0.5 > avg_exec_us) perf_score = 50;
-  else if (q->exec_us * 0.75 > avg_exec_us) perf_score = 75;
-  else if (q->exec_us * 4 < avg_exec_us) perf_score = 300;
-  else if (q->exec_us * 3 < avg_exec_us) perf_score = 200;
-  else if (q->exec_us * 2 < avg_exec_us) perf_score = 150;
-
-  /* Adjust score based on bitmap size. The working theory is that better
-     coverage translates to better targets. Multiplier from 0.25x to 3x. */
-
-  if (q->bitmap_size * 0.3 > avg_bitmap_size) perf_score *= 3;
-  else if (q->bitmap_size * 0.5 > avg_bitmap_size) perf_score *= 2;
-  else if (q->bitmap_size * 0.75 > avg_bitmap_size) perf_score *= 1.5;
-  else if (q->bitmap_size * 3 < avg_bitmap_size) perf_score *= 0.25;
-  else if (q->bitmap_size * 2 < avg_bitmap_size) perf_score *= 0.5;
-  else if (q->bitmap_size * 1.5 < avg_bitmap_size) perf_score *= 0.75;
-
-  /* Adjust score based on handicap. Handicap is proportional to how late
-     in the game we learned about this path. Latecomers are allowed to run
-     for a bit longer until they catch up with the rest. */
-
-  if (q->handicap >= 4) {
-    perf_score *= 4;
-    q->handicap -= 4;
-  } else if (q->handicap) {
-    perf_score *= 2;
-    --q->handicap;
-  }
-
-  /* Final adjustment based on input depth, under the assumption that fuzzing
-     deeper test cases is more likely to reveal stuff that can't be
-     discovered with traditional fuzzers. */
-
-  switch (q->depth) {
-
-    case 0 ... 3:   break;
-    case 4 ... 7:   perf_score *= 2; break;
-    case 8 ... 13:  perf_score *= 3; break;
-    case 14 ... 25: perf_score *= 4; break;
-    default:        perf_score *= 5;
-
-  }
-
-  u64 fuzz = q->n_fuzz;
-  u64 fuzz_total;
-
-  u32 n_paths, fuzz_mu;
-  u32 factor = 1;
-
-  switch (schedule) {
-
-    case EXPLORE:
-      break;
-
-    case EXPLOIT:
-      factor = MAX_FACTOR;
-      break;
-
-    case COE:
-      fuzz_total = 0;
-      n_paths = 0;
-
-      struct queue_entry *queue_it = queue;
-      while (queue_it) {
-        fuzz_total += queue_it->n_fuzz;
-        n_paths ++;
-        queue_it = queue_it->next;
-      }
-
-      fuzz_mu = fuzz_total / n_paths;
-      if (fuzz <= fuzz_mu) {
-        if (q->fuzz_level < 16)
-          factor = ((u32) (1 << q->fuzz_level));
-        else
-          factor = MAX_FACTOR;
-      } else {
-        factor = 0;
-      }
-      break;
-
-    case FAST:
-      if (q->fuzz_level < 16) {
-         factor = ((u32) (1 << q->fuzz_level)) / (fuzz == 0 ? 1 : fuzz);
-      } else
-        factor = MAX_FACTOR / (fuzz == 0 ? 1 : next_p2 (fuzz));
-      break;
-
-    case LIN:
-      factor = q->fuzz_level / (fuzz == 0 ? 1 : fuzz);
-      break;
-
-    case QUAD:
-      factor = q->fuzz_level * q->fuzz_level / (fuzz == 0 ? 1 : fuzz);
-      break;
-
-    default:
-      PFATAL ("Unknown Power Schedule");
-  }
-  if (factor > MAX_FACTOR)
-    factor = MAX_FACTOR;
-
-  perf_score *= factor / POWER_BETA;
-
-  // MOpt mode
-  if (limit_time_sig != 0 && max_depth - q->depth < 3) perf_score *= 2;
-  else if (perf_score < 1) perf_score = 1; // Add a lower bound to AFLFast's energy assignment strategies
-
-  /* Make sure that we don't go over limit. */
-
-  if (perf_score > havoc_max_mult * 100) perf_score = havoc_max_mult * 100;
-
-  return perf_score;
-
-}
-
-
-/* Helper function to see if a particular change (xor_val = old ^ new) could
-   be a product of deterministic bit flips with the lengths and stepovers
-   attempted by afl-fuzz. This is used to avoid dupes in some of the
-   deterministic fuzzing operations that follow bit flips. We also
-   return 1 if xor_val is zero, which implies that the old and attempted new
-   values are identical and the exec would be a waste of time. */
-
-static u8 could_be_bitflip(u32 xor_val) {
-
-  u32 sh = 0;
-
-  if (!xor_val) return 1;
-
-  /* Shift left until first bit set. */
-
-  while (!(xor_val & 1)) { ++sh; xor_val >>= 1; }
-
-  /* 1-, 2-, and 4-bit patterns are OK anywhere. */
-
-  if (xor_val == 1 || xor_val == 3 || xor_val == 15) return 1;
-
-  /* 8-, 16-, and 32-bit patterns are OK only if shift factor is
-     divisible by 8, since that's the stepover for these ops. */
-
-  if (sh & 7) return 0;
-
-  if (xor_val == 0xff || xor_val == 0xffff || xor_val == 0xffffffff)
-    return 1;
-
-  return 0;
-
-}
-
-
-/* Helper function to see if a particular value is reachable through
-   arithmetic operations. Used for similar purposes. */
-
-static u8 could_be_arith(u32 old_val, u32 new_val, u8 blen) {
-
-  u32 i, ov = 0, nv = 0, diffs = 0;
-
-  if (old_val == new_val) return 1;
-
-  /* See if one-byte adjustments to any byte could produce this result. */
-
-  for (i = 0; i < blen; ++i) {
-
-    u8 a = old_val >> (8 * i),
-       b = new_val >> (8 * i);
-
-    if (a != b) { ++diffs; ov = a; nv = b; }
-
-  }
-
-  /* If only one byte differs and the values are within range, return 1. */
-
-  if (diffs == 1) {
-
-    if ((u8)(ov - nv) <= ARITH_MAX ||
-        (u8)(nv - ov) <= ARITH_MAX) return 1;
-
-  }
-
-  if (blen == 1) return 0;
-
-  /* See if two-byte adjustments to any byte would produce this result. */
-
-  diffs = 0;
-
-  for (i = 0; i < blen / 2; ++i) {
-
-    u16 a = old_val >> (16 * i),
-        b = new_val >> (16 * i);
-
-    if (a != b) { ++diffs; ov = a; nv = b; }
-
-  }
-
-  /* If only one word differs and the values are within range, return 1. */
-
-  if (diffs == 1) {
-
-    if ((u16)(ov - nv) <= ARITH_MAX ||
-        (u16)(nv - ov) <= ARITH_MAX) return 1;
-
-    ov = SWAP16(ov); nv = SWAP16(nv);
-
-    if ((u16)(ov - nv) <= ARITH_MAX ||
-        (u16)(nv - ov) <= ARITH_MAX) return 1;
-
-  }
-
-  /* Finally, let's do the same thing for dwords. */
-
-  if (blen == 4) {
-
-    if ((u32)(old_val - new_val) <= ARITH_MAX ||
-        (u32)(new_val - old_val) <= ARITH_MAX) return 1;
-
-    new_val = SWAP32(new_val);
-    old_val = SWAP32(old_val);
-
-    if ((u32)(old_val - new_val) <= ARITH_MAX ||
-        (u32)(new_val - old_val) <= ARITH_MAX) return 1;
-
-  }
-
-  return 0;
-
-}
-
-
-/* Last but not least, a similar helper to see if insertion of an 
-   interesting integer is redundant given the insertions done for
-   shorter blen. The last param (check_le) is set if the caller
-   already executed LE insertion for current blen and wants to see
-   if BE variant passed in new_val is unique. */
-
-static u8 could_be_interest(u32 old_val, u32 new_val, u8 blen, u8 check_le) {
-
-  u32 i, j;
-
-  if (old_val == new_val) return 1;
-
-  /* See if one-byte insertions from interesting_8 over old_val could
-     produce new_val. */
-
-  for (i = 0; i < blen; ++i) {
-
-    for (j = 0; j < sizeof(interesting_8); ++j) {
-
-      u32 tval = (old_val & ~(0xff << (i * 8))) |
-                 (((u8)interesting_8[j]) << (i * 8));
-
-      if (new_val == tval) return 1;
-
-    }
-
-  }
-
-  /* Bail out unless we're also asked to examine two-byte LE insertions
-     as a preparation for BE attempts. */
-
-  if (blen == 2 && !check_le) return 0;
-
-  /* See if two-byte insertions over old_val could give us new_val. */
-
-  for (i = 0; i < blen - 1; ++i) {
-
-    for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
-
-      u32 tval = (old_val & ~(0xffff << (i * 8))) |
-                 (((u16)interesting_16[j]) << (i * 8));
-
-      if (new_val == tval) return 1;
-
-      /* Continue here only if blen > 2. */
-
-      if (blen > 2) {
-
-        tval = (old_val & ~(0xffff << (i * 8))) |
-               (SWAP16(interesting_16[j]) << (i * 8));
-
-        if (new_val == tval) return 1;
-
-      }
-
-    }
-
-  }
-
-  if (blen == 4 && check_le) {
-
-    /* See if four-byte insertions could produce the same result
-       (LE only). */
-
-    for (j = 0; j < sizeof(interesting_32) / 4; ++j)
-      if (new_val == (u32)interesting_32[j]) return 1;
-
-  }
-
-  return 0;
-
-}
-
-
-/* Take the current entry from the queue, fuzz it for a while. This
-   function is a tad too long... returns 0 if fuzzed successfully, 1 if
-   skipped or bailed out. */
-
-static u8 fuzz_one_original(char** argv) {
-
-  s32 len, fd, temp_len, i, j;
-  u8  *in_buf, *out_buf, *orig_in, *ex_tmp, *eff_map = 0;
-  u64 havoc_queued = 0,  orig_hit_cnt, new_hit_cnt;
-  u32 splice_cycle = 0, perf_score = 100, orig_perf, prev_cksum, eff_cnt = 1;
-
-  u8  ret_val = 1, doing_det = 0;
-
-  u8  a_collect[MAX_AUTO_EXTRA];
-  u32 a_len = 0;
-
-#ifdef IGNORE_FINDS
-
-  /* In IGNORE_FINDS mode, skip any entries that weren't in the
-     initial data set. */
-
-  if (queue_cur->depth > 1) return 1;
-
-#else
-
-  if (pending_favored) {
-
-    /* If we have any favored, non-fuzzed new arrivals in the queue,
-       possibly skip to them at the expense of already-fuzzed or non-favored
-       cases. */
-
-    if (((queue_cur->was_fuzzed > 0 || queue_cur->fuzz_level > 0) || !queue_cur->favored) &&
-        UR(100) < SKIP_TO_NEW_PROB) return 1;
-
-  } else if (!dumb_mode && !queue_cur->favored && queued_paths > 10) {
-
-    /* Otherwise, still possibly skip non-favored cases, albeit less often.
-       The odds of skipping stuff are higher for already-fuzzed inputs and
-       lower for never-fuzzed entries. */
-
-    if (queue_cycle > 1 && (queue_cur->fuzz_level == 0 || queue_cur->was_fuzzed)) {
-
-      if (UR(100) < SKIP_NFAV_NEW_PROB) return 1;
-
-    } else {
-
-      if (UR(100) < SKIP_NFAV_OLD_PROB) return 1;
-
-    }
-
-  }
-
-#endif /* ^IGNORE_FINDS */
-
-  if (not_on_tty) {
-    ACTF("Fuzzing test case #%u (%u total, %llu uniq crashes found)...",
-         current_entry, queued_paths, unique_crashes);
-    fflush(stdout);
-  }
-
-  /* Map the test case into memory. */
-
-  fd = open(queue_cur->fname, O_RDONLY);
-
-  if (fd < 0) PFATAL("Unable to open '%s'", queue_cur->fname);
-
-  len = queue_cur->len;
-
-  orig_in = in_buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-
-  if (orig_in == MAP_FAILED) PFATAL("Unable to mmap '%s' with len %d", queue_cur->fname, len);
-
-  close(fd);
-
-  /* We could mmap() out_buf as MAP_PRIVATE, but we end up clobbering every
-     single byte anyway, so it wouldn't give us any performance or memory usage
-     benefits. */
-
-  out_buf = ck_alloc_nozero(len);
-
-  subseq_tmouts = 0;
-
-  cur_depth = queue_cur->depth;
-
-  /*******************************************
-   * CALIBRATION (only if failed earlier on) *
-   *******************************************/
-
-  if (queue_cur->cal_failed) {
-
-    u8 res = FAULT_TMOUT;
-
-    if (queue_cur->cal_failed < CAL_CHANCES) {
-
-      res = calibrate_case(argv, queue_cur, in_buf, queue_cycle - 1, 0);
-
-      if (res == FAULT_ERROR)
-        FATAL("Unable to execute target application");
-
-    }
-
-    if (stop_soon || res != crash_mode) {
-      ++cur_skipped_paths;
-      goto abandon_entry;
-    }
-
-  }
-
-  /************
-   * TRIMMING *
-   ************/
-
-  if (!dumb_mode && !queue_cur->trim_done && !custom_mutator) {
-
-    u8 res = trim_case(argv, queue_cur, in_buf);
-
-    if (res == FAULT_ERROR)
-      FATAL("Unable to execute target application");
-
-    if (stop_soon) {
-      ++cur_skipped_paths;
-      goto abandon_entry;
-    }
-
-    /* Don't retry trimming, even if it failed. */
-
-    queue_cur->trim_done = 1;
-
-    len = queue_cur->len;
-
-  }
-
-  memcpy(out_buf, in_buf, len);
-
-  /*********************
-   * PERFORMANCE SCORE *
-   *********************/
-
-  orig_perf = perf_score = calculate_score(queue_cur);
-
-  if (perf_score == 0) goto abandon_entry;
-
-  if (custom_mutator) {
-    stage_short = "custom";
-    stage_name = "custom mutator";
-    stage_max = len << 3;
-    stage_val_type = STAGE_VAL_NONE;
-
-    const u32 max_seed_size = 4096*4096;
-    u8* mutated_buf = ck_alloc(max_seed_size);
-
-    orig_hit_cnt = queued_paths + unique_crashes;
-
-    for (stage_cur = 0 ; stage_cur < stage_max ; ++stage_cur) {
-      size_t orig_size = (size_t) len;
-      size_t mutated_size = custom_mutator(out_buf, orig_size, mutated_buf, max_seed_size, UR(UINT32_MAX));
-      if (mutated_size > 0) {
-        out_buf = ck_realloc(out_buf, mutated_size);
-        memcpy(out_buf, mutated_buf, mutated_size);
-        if (common_fuzz_stuff(argv, out_buf, (u32) mutated_size)) {
-          goto abandon_entry;
-        }
-      }
-    }
-
-    ck_free(mutated_buf);
-    new_hit_cnt = queued_paths + unique_crashes;
-
-    stage_finds[STAGE_CUSTOM_MUTATOR]  += new_hit_cnt - orig_hit_cnt;
-    stage_cycles[STAGE_CUSTOM_MUTATOR] += stage_max;
-    goto abandon_entry;
-  }
-
-
-  /* Skip right away if -d is given, if it has not been chosen sufficiently
-     often to warrant the expensive deterministic stage (fuzz_level), or
-     if it has gone through deterministic testing in earlier, resumed runs
-     (passed_det). */
-
-  if (skip_deterministic
-     || ((!queue_cur->passed_det)
-        && perf_score < (
-              queue_cur->depth * 30 <= havoc_max_mult * 100
-              ? queue_cur->depth * 30
-              : havoc_max_mult * 100))
-     || queue_cur->passed_det)
-#ifdef USE_PYTHON
-    goto python_stage;
-#else
-    goto havoc_stage;
-#endif
-
-  /* Skip deterministic fuzzing if exec path checksum puts this out of scope
-     for this master instance. */
-
-  if (master_max && (queue_cur->exec_cksum % master_max) != master_id - 1)
-#ifdef USE_PYTHON
-    goto python_stage;
-#else
-    goto havoc_stage;
-#endif
-
-  doing_det = 1;
-
-  /*********************************************
-   * SIMPLE BITFLIP (+dictionary construction) *
-   *********************************************/
-
-#define FLIP_BIT(_ar, _b) do { \
-    u8* _arf = (u8*)(_ar); \
-    u32 _bf = (_b); \
-    _arf[(_bf) >> 3] ^= (128 >> ((_bf) & 7)); \
-  } while (0)
-
-  /* Single walking bit. */
-
-  stage_short = "flip1";
-  stage_max   = len << 3;
-  stage_name  = "bitflip 1/1";
-
-  stage_val_type = STAGE_VAL_NONE;
-
-  orig_hit_cnt = queued_paths + unique_crashes;
-
-  prev_cksum = queue_cur->exec_cksum;
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-    stage_cur_byte = stage_cur >> 3;
-
-    FLIP_BIT(out_buf, stage_cur);
-
-    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-    FLIP_BIT(out_buf, stage_cur);
-
-    /* While flipping the least significant bit in every byte, pull of an extra
-       trick to detect possible syntax tokens. In essence, the idea is that if
-       you have a binary blob like this:
-
-       xxxxxxxxIHDRxxxxxxxx
-
-       ...and changing the leading and trailing bytes causes variable or no
-       changes in program flow, but touching any character in the "IHDR" string
-       always produces the same, distinctive path, it's highly likely that
-       "IHDR" is an atomically-checked magic value of special significance to
-       the fuzzed format.
-
-       We do this here, rather than as a separate stage, because it's a nice
-       way to keep the operation approximately "free" (i.e., no extra execs).
-       
-       Empirically, performing the check when flipping the least significant bit
-       is advantageous, compared to doing it at the time of more disruptive
-       changes, where the program flow may be affected in more violent ways.
-
-       The caveat is that we won't generate dictionaries in the -d mode or -S
-       mode - but that's probably a fair trade-off.
-
-       This won't work particularly well with paths that exhibit variable
-       behavior, but fails gracefully, so we'll carry out the checks anyway.
-
-      */
-
-    if (!dumb_mode && (stage_cur & 7) == 7) {
-
-      u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-      if (stage_cur == stage_max - 1 && cksum == prev_cksum) {
-
-        /* If at end of file and we are still collecting a string, grab the
-           final character and force output. */
-
-        if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
-        ++a_len;
-
-        if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
-          maybe_add_auto(a_collect, a_len);
-
-      } else if (cksum != prev_cksum) {
-
-        /* Otherwise, if the checksum has changed, see if we have something
-           worthwhile queued up, and collect that if the answer is yes. */
-
-        if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
-          maybe_add_auto(a_collect, a_len);
-
-        a_len = 0;
-        prev_cksum = cksum;
-
-      }
-
-      /* Continue collecting string, but only if the bit flip actually made
-         any difference - we don't want no-op tokens. */
-
-      if (cksum != queue_cur->exec_cksum) {
-
-        if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];        
-        ++a_len;
-
-      }
-
-    }
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_FLIP1]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_FLIP1] += stage_max;
-
-  /* Two walking bits. */
-
-  stage_name  = "bitflip 2/1";
-  stage_short = "flip2";
-  stage_max   = (len << 3) - 1;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-    stage_cur_byte = stage_cur >> 3;
-
-    FLIP_BIT(out_buf, stage_cur);
-    FLIP_BIT(out_buf, stage_cur + 1);
-
-    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-    FLIP_BIT(out_buf, stage_cur);
-    FLIP_BIT(out_buf, stage_cur + 1);
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_FLIP2]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_FLIP2] += stage_max;
-
-  /* Four walking bits. */
-
-  stage_name  = "bitflip 4/1";
-  stage_short = "flip4";
-  stage_max   = (len << 3) - 3;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-    stage_cur_byte = stage_cur >> 3;
-
-    FLIP_BIT(out_buf, stage_cur);
-    FLIP_BIT(out_buf, stage_cur + 1);
-    FLIP_BIT(out_buf, stage_cur + 2);
-    FLIP_BIT(out_buf, stage_cur + 3);
-
-    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-    FLIP_BIT(out_buf, stage_cur);
-    FLIP_BIT(out_buf, stage_cur + 1);
-    FLIP_BIT(out_buf, stage_cur + 2);
-    FLIP_BIT(out_buf, stage_cur + 3);
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_FLIP4]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_FLIP4] += stage_max;
-
-  /* Effector map setup. These macros calculate:
-
-     EFF_APOS      - position of a particular file offset in the map.
-     EFF_ALEN      - length of a map with a particular number of bytes.
-     EFF_SPAN_ALEN - map span for a sequence of bytes.
-
-   */
-
-#define EFF_APOS(_p)          ((_p) >> EFF_MAP_SCALE2)
-#define EFF_REM(_x)           ((_x) & ((1 << EFF_MAP_SCALE2) - 1))
-#define EFF_ALEN(_l)          (EFF_APOS(_l) + !!EFF_REM(_l))
-#define EFF_SPAN_ALEN(_p, _l) (EFF_APOS((_p) + (_l) - 1) - EFF_APOS(_p) + 1)
-
-  /* Initialize effector map for the next step (see comments below). Always
-     flag first and last byte as doing something. */
-
-  eff_map    = ck_alloc(EFF_ALEN(len));
-  eff_map[0] = 1;
-
-  if (EFF_APOS(len - 1) != 0) {
-    eff_map[EFF_APOS(len - 1)] = 1;
-    ++eff_cnt;
-  }
-
-  /* Walking byte. */
-
-  stage_name  = "bitflip 8/8";
-  stage_short = "flip8";
-  stage_max   = len;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-    stage_cur_byte = stage_cur;
-
-    out_buf[stage_cur] ^= 0xFF;
-
-    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-    /* We also use this stage to pull off a simple trick: we identify
-       bytes that seem to have no effect on the current execution path
-       even when fully flipped - and we skip them during more expensive
-       deterministic stages, such as arithmetics or known ints. */
-
-    if (!eff_map[EFF_APOS(stage_cur)]) {
-
-      u32 cksum;
-
-      /* If in dumb mode or if the file is very short, just flag everything
-         without wasting time on checksums. */
-
-      if (!dumb_mode && len >= EFF_MIN_LEN)
-        cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-      else
-        cksum = ~queue_cur->exec_cksum;
-
-      if (cksum != queue_cur->exec_cksum) {
-        eff_map[EFF_APOS(stage_cur)] = 1;
-        ++eff_cnt;
-      }
-
-    }
-
-    out_buf[stage_cur] ^= 0xFF;
-
-  }
-
-  /* If the effector map is more than EFF_MAX_PERC dense, just flag the
-     whole thing as worth fuzzing, since we wouldn't be saving much time
-     anyway. */
-
-  if (eff_cnt != EFF_ALEN(len) &&
-      eff_cnt * 100 / EFF_ALEN(len) > EFF_MAX_PERC) {
-
-    memset(eff_map, 1, EFF_ALEN(len));
-
-    blocks_eff_select += EFF_ALEN(len);
-
-  } else {
-
-    blocks_eff_select += eff_cnt;
-
-  }
-
-  blocks_eff_total += EFF_ALEN(len);
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_FLIP8]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_FLIP8] += stage_max;
-
-  /* Two walking bytes. */
-
-  if (len < 2) goto skip_bitflip;
-
-  stage_name  = "bitflip 16/8";
-  stage_short = "flip16";
-  stage_cur   = 0;
-  stage_max   = len - 1;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len - 1; ++i) {
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-      --stage_max;
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    *(u16*)(out_buf + i) ^= 0xFFFF;
-
-    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-    ++stage_cur;
-
-    *(u16*)(out_buf + i) ^= 0xFFFF;
-
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_FLIP16]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_FLIP16] += stage_max;
-
-  if (len < 4) goto skip_bitflip;
-
-  /* Four walking bytes. */
-
-  stage_name  = "bitflip 32/8";
-  stage_short = "flip32";
-  stage_cur   = 0;
-  stage_max   = len - 3;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len - 3; ++i) {
-
-    /* Let's consult the effector map... */
-    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-        !eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-      --stage_max;
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    *(u32*)(out_buf + i) ^= 0xFFFFFFFF;
-
-    if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-    ++stage_cur;
-
-    *(u32*)(out_buf + i) ^= 0xFFFFFFFF;
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_FLIP32]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_FLIP32] += stage_max;
-
-skip_bitflip:
-
-  if (no_arith) goto skip_arith;
-
-  /**********************
-   * ARITHMETIC INC/DEC *
-   **********************/
-
-  /* 8-bit arithmetics. */
-
-  stage_name  = "arith 8/8";
-  stage_short = "arith8";
-  stage_cur   = 0;
-  stage_max   = 2 * len * ARITH_MAX;
-
-  stage_val_type = STAGE_VAL_LE;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len; ++i) {
-
-    u8 orig = out_buf[i];
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)]) {
-      stage_max -= 2 * ARITH_MAX;
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    for (j = 1; j <= ARITH_MAX; ++j) {
-
-      u8 r = orig ^ (orig + j);
-
-      /* Do arithmetic operations only if the result couldn't be a product
-         of a bitflip. */
-
-      if (!could_be_bitflip(r)) {
-
-        stage_cur_val = j;
-        out_buf[i] = orig + j;
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      r =  orig ^ (orig - j);
-
-      if (!could_be_bitflip(r)) {
-
-        stage_cur_val = -j;
-        out_buf[i] = orig - j;
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      out_buf[i] = orig;
-
-    }
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_ARITH8]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_ARITH8] += stage_max;
-
-  /* 16-bit arithmetics, both endians. */
-
-  if (len < 2) goto skip_arith;
-
-  stage_name  = "arith 16/8";
-  stage_short = "arith16";
-  stage_cur   = 0;
-  stage_max   = 4 * (len - 1) * ARITH_MAX;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len - 1; ++i) {
-
-    u16 orig = *(u16*)(out_buf + i);
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-      stage_max -= 4 * ARITH_MAX;
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    for (j = 1; j <= ARITH_MAX; ++j) {
-
-      u16 r1 = orig ^ (orig + j),
-          r2 = orig ^ (orig - j),
-          r3 = orig ^ SWAP16(SWAP16(orig) + j),
-          r4 = orig ^ SWAP16(SWAP16(orig) - j);
-
-      /* Try little endian addition and subtraction first. Do it only
-         if the operation would affect more than one byte (hence the 
-         & 0xff overflow checks) and if it couldn't be a product of
-         a bitflip. */
-
-      stage_val_type = STAGE_VAL_LE; 
-
-      if ((orig & 0xff) + j > 0xff && !could_be_bitflip(r1)) {
-
-        stage_cur_val = j;
-        *(u16*)(out_buf + i) = orig + j;
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
- 
-      } else --stage_max;
-
-      if ((orig & 0xff) < j && !could_be_bitflip(r2)) {
-
-        stage_cur_val = -j;
-        *(u16*)(out_buf + i) = orig - j;
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      /* Big endian comes next. Same deal. */
-
-      stage_val_type = STAGE_VAL_BE;
-
-
-      if ((orig >> 8) + j > 0xff && !could_be_bitflip(r3)) {
-
-        stage_cur_val = j;
-        *(u16*)(out_buf + i) = SWAP16(SWAP16(orig) + j);
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      if ((orig >> 8) < j && !could_be_bitflip(r4)) {
-
-        stage_cur_val = -j;
-        *(u16*)(out_buf + i) = SWAP16(SWAP16(orig) - j);
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      *(u16*)(out_buf + i) = orig;
-
-    }
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_ARITH16]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_ARITH16] += stage_max;
-
-  /* 32-bit arithmetics, both endians. */
-
-  if (len < 4) goto skip_arith;
-
-  stage_name  = "arith 32/8";
-  stage_short = "arith32";
-  stage_cur   = 0;
-  stage_max   = 4 * (len - 3) * ARITH_MAX;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len - 3; ++i) {
-
-    u32 orig = *(u32*)(out_buf + i);
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-        !eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-      stage_max -= 4 * ARITH_MAX;
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    for (j = 1; j <= ARITH_MAX; ++j) {
-
-      u32 r1 = orig ^ (orig + j),
-          r2 = orig ^ (orig - j),
-          r3 = orig ^ SWAP32(SWAP32(orig) + j),
-          r4 = orig ^ SWAP32(SWAP32(orig) - j);
-
-      /* Little endian first. Same deal as with 16-bit: we only want to
-         try if the operation would have effect on more than two bytes. */
-
-      stage_val_type = STAGE_VAL_LE;
-
-      if ((orig & 0xffff) + j > 0xffff && !could_be_bitflip(r1)) {
-
-        stage_cur_val = j;
-        *(u32*)(out_buf + i) = orig + j;
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      if ((orig & 0xffff) < j && !could_be_bitflip(r2)) {
-
-        stage_cur_val = -j;
-        *(u32*)(out_buf + i) = orig - j;
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      /* Big endian next. */
-
-      stage_val_type = STAGE_VAL_BE;
-
-      if ((SWAP32(orig) & 0xffff) + j > 0xffff && !could_be_bitflip(r3)) {
-
-        stage_cur_val = j;
-        *(u32*)(out_buf + i) = SWAP32(SWAP32(orig) + j);
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      if ((SWAP32(orig) & 0xffff) < j && !could_be_bitflip(r4)) {
-
-        stage_cur_val = -j;
-        *(u32*)(out_buf + i) = SWAP32(SWAP32(orig) - j);
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      *(u32*)(out_buf + i) = orig;
-
-    }
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_ARITH32]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_ARITH32] += stage_max;
-
-skip_arith:
-
-  /**********************
-   * INTERESTING VALUES *
-   **********************/
-
-  stage_name  = "interest 8/8";
-  stage_short = "int8";
-  stage_cur   = 0;
-  stage_max   = len * sizeof(interesting_8);
-
-  stage_val_type = STAGE_VAL_LE;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  /* Setting 8-bit integers. */
-
-  for (i = 0; i < len; ++i) {
-
-    u8 orig = out_buf[i];
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)]) {
-      stage_max -= sizeof(interesting_8);
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    for (j = 0; j < sizeof(interesting_8); ++j) {
-
-      /* Skip if the value could be a product of bitflips or arithmetics. */
-
-      if (could_be_bitflip(orig ^ (u8)interesting_8[j]) ||
-          could_be_arith(orig, (u8)interesting_8[j], 1)) {
-        --stage_max;
-        continue;
-      }
-
-      stage_cur_val = interesting_8[j];
-      out_buf[i] = interesting_8[j];
-
-      if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-      out_buf[i] = orig;
-      ++stage_cur;
-
-    }
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_INTEREST8]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_INTEREST8] += stage_max;
-
-  /* Setting 16-bit integers, both endians. */
-
-  if (no_arith || len < 2) goto skip_interest;
-
-  stage_name  = "interest 16/8";
-  stage_short = "int16";
-  stage_cur   = 0;
-  stage_max   = 2 * (len - 1) * (sizeof(interesting_16) >> 1);
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len - 1; ++i) {
-
-    u16 orig = *(u16*)(out_buf + i);
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-      stage_max -= sizeof(interesting_16);
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
-
-      stage_cur_val = interesting_16[j];
-
-      /* Skip if this could be a product of a bitflip, arithmetics,
-         or single-byte interesting value insertion. */
-
-      if (!could_be_bitflip(orig ^ (u16)interesting_16[j]) &&
-          !could_be_arith(orig, (u16)interesting_16[j], 2) &&
-          !could_be_interest(orig, (u16)interesting_16[j], 2, 0)) {
-
-        stage_val_type = STAGE_VAL_LE;
-
-        *(u16*)(out_buf + i) = interesting_16[j];
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      if ((u16)interesting_16[j] != SWAP16(interesting_16[j]) &&
-          !could_be_bitflip(orig ^ SWAP16(interesting_16[j])) &&
-          !could_be_arith(orig, SWAP16(interesting_16[j]), 2) &&
-          !could_be_interest(orig, SWAP16(interesting_16[j]), 2, 1)) {
-
-        stage_val_type = STAGE_VAL_BE;
-
-        *(u16*)(out_buf + i) = SWAP16(interesting_16[j]);
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-    }
-
-    *(u16*)(out_buf + i) = orig;
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_INTEREST16]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_INTEREST16] += stage_max;
-
-  if (len < 4) goto skip_interest;
-
-  /* Setting 32-bit integers, both endians. */
-
-  stage_name  = "interest 32/8";
-  stage_short = "int32";
-  stage_cur   = 0;
-  stage_max   = 2 * (len - 3) * (sizeof(interesting_32) >> 2);
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len - 3; i++) {
-
-    u32 orig = *(u32*)(out_buf + i);
-
-    /* Let's consult the effector map... */
-
-    if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-        !eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-      stage_max -= sizeof(interesting_32) >> 1;
-      continue;
-    }
-
-    stage_cur_byte = i;
-
-    for (j = 0; j < sizeof(interesting_32) / 4; ++j) {
-
-      stage_cur_val = interesting_32[j];
-
-      /* Skip if this could be a product of a bitflip, arithmetics,
-         or word interesting value insertion. */
-
-      if (!could_be_bitflip(orig ^ (u32)interesting_32[j]) &&
-          !could_be_arith(orig, interesting_32[j], 4) &&
-          !could_be_interest(orig, interesting_32[j], 4, 0)) {
-
-        stage_val_type = STAGE_VAL_LE;
-
-        *(u32*)(out_buf + i) = interesting_32[j];
-
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-      if ((u32)interesting_32[j] != SWAP32(interesting_32[j]) &&
-          !could_be_bitflip(orig ^ SWAP32(interesting_32[j])) &&
-          !could_be_arith(orig, SWAP32(interesting_32[j]), 4) &&
-          !could_be_interest(orig, SWAP32(interesting_32[j]), 4, 1)) {
-
-        stage_val_type = STAGE_VAL_BE;
-
-        *(u32*)(out_buf + i) = SWAP32(interesting_32[j]);
-        if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-        ++stage_cur;
-
-      } else --stage_max;
-
-    }
-
-    *(u32*)(out_buf + i) = orig;
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_INTEREST32]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_INTEREST32] += stage_max;
-
-skip_interest:
-
-  /********************
-   * DICTIONARY STUFF *
-   ********************/
-
-  if (!extras_cnt) goto skip_user_extras;
-
-  /* Overwrite with user-supplied extras. */
-
-  stage_name  = "user extras (over)";
-  stage_short = "ext_UO";
-  stage_cur   = 0;
-  stage_max   = extras_cnt * len;
-
-  stage_val_type = STAGE_VAL_NONE;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len; ++i) {
-
-    u32 last_len = 0;
-
-    stage_cur_byte = i;
-
-    /* Extras are sorted by size, from smallest to largest. This means
-       that we don't have to worry about restoring the buffer in
-       between writes at a particular offset determined by the outer
-       loop. */
-
-    for (j = 0; j < extras_cnt; ++j) {
-
-      /* Skip extras probabilistically if extras_cnt > MAX_DET_EXTRAS. Also
-         skip them if there's no room to insert the payload, if the token
-         is redundant, or if its entire span has no bytes set in the effector
-         map. */
-
-      if ((extras_cnt > MAX_DET_EXTRAS && UR(extras_cnt) >= MAX_DET_EXTRAS) ||
-          extras[j].len > len - i ||
-          !memcmp(extras[j].data, out_buf + i, extras[j].len) ||
-          !memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, extras[j].len))) {
-
-        --stage_max;
-        continue;
-
-      }
-
-      last_len = extras[j].len;
-      memcpy(out_buf + i, extras[j].data, last_len);
-
-      if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-      ++stage_cur;
-
-    }
-
-    /* Restore all the clobbered memory. */
-    memcpy(out_buf + i, in_buf + i, last_len);
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_EXTRAS_UO]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_EXTRAS_UO] += stage_max;
-
-  /* Insertion of user-supplied extras. */
-
-  stage_name  = "user extras (insert)";
-  stage_short = "ext_UI";
-  stage_cur   = 0;
-  stage_max   = extras_cnt * len;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  ex_tmp = ck_alloc(len + MAX_DICT_FILE);
-
-  for (i = 0; i <= len; ++i) {
-
-    stage_cur_byte = i;
-
-    for (j = 0; j < extras_cnt; ++j) {
-
-      if (len + extras[j].len > MAX_FILE) {
-        --stage_max; 
-        continue;
-      }
-
-      /* Insert token */
-      memcpy(ex_tmp + i, extras[j].data, extras[j].len);
-
-      /* Copy tail */
-      memcpy(ex_tmp + i + extras[j].len, out_buf + i, len - i);
-
-      if (common_fuzz_stuff(argv, ex_tmp, len + extras[j].len)) {
-        ck_free(ex_tmp);
-        goto abandon_entry;
-      }
-
-      ++stage_cur;
-
-    }
-
-    /* Copy head */
-    ex_tmp[i] = out_buf[i];
-
-  }
-
-  ck_free(ex_tmp);
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_EXTRAS_UI]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_EXTRAS_UI] += stage_max;
-
-skip_user_extras:
-
-  if (!a_extras_cnt) goto skip_extras;
-
-  stage_name  = "auto extras (over)";
-  stage_short = "ext_AO";
-  stage_cur   = 0;
-  stage_max   = MIN(a_extras_cnt, USE_AUTO_EXTRAS) * len;
-
-  stage_val_type = STAGE_VAL_NONE;
-
-  orig_hit_cnt = new_hit_cnt;
-
-  for (i = 0; i < len; ++i) {
-
-    u32 last_len = 0;
-
-    stage_cur_byte = i;
-
-    for (j = 0; j < MIN(a_extras_cnt, USE_AUTO_EXTRAS); ++j) {
-
-      /* See the comment in the earlier code; extras are sorted by size. */
-
-      if (a_extras[j].len > len - i ||
-          !memcmp(a_extras[j].data, out_buf + i, a_extras[j].len) ||
-          !memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, a_extras[j].len))) {
-
-        --stage_max;
-        continue;
-
-      }
-
-      last_len = a_extras[j].len;
-      memcpy(out_buf + i, a_extras[j].data, last_len);
-
-      if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-      ++stage_cur;
-
-    }
-
-    /* Restore all the clobbered memory. */
-    memcpy(out_buf + i, in_buf + i, last_len);
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_EXTRAS_AO]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_EXTRAS_AO] += stage_max;
-
-skip_extras:
-
-  /* If we made this to here without jumping to havoc_stage or abandon_entry,
-     we're properly done with deterministic steps and can mark it as such
-     in the .state/ directory. */
-
-  if (!queue_cur->passed_det) mark_as_det_done(queue_cur);
-
-#ifdef USE_PYTHON
-python_stage:
-  /**********************************
-   * EXTERNAL MUTATORS (Python API) *
-   **********************************/
-
-  if (!py_module) goto havoc_stage;
-
-  stage_name  = "python";
-  stage_short = "python";
-  stage_max   = HAVOC_CYCLES * perf_score / havoc_div / 100;
-
-  if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
-
-  orig_hit_cnt = queued_paths + unique_crashes;
-
-  char* retbuf = NULL;
-  size_t retlen = 0;
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-    struct queue_entry* target;
-    u32 tid;
-    u8* new_buf;
-
-retry_external_pick:
-    /* Pick a random other queue entry for passing to external API */
-    do { tid = UR(queued_paths); } while (tid == current_entry && queued_paths > 1);
-
-    target = queue;
-
-    while (tid >= 100) { target = target->next_100; tid -= 100; }
-    while (tid--) target = target->next;
-
-    /* Make sure that the target has a reasonable length. */
-
-    while (target && (target->len < 2 || target == queue_cur) && queued_paths > 1) {
-      target = target->next;
-      ++splicing_with;
-    }
-
-    if (!target) goto retry_external_pick;
-
-    /* Read the additional testcase into a new buffer. */
-    fd = open(target->fname, O_RDONLY);
-    if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
-    new_buf = ck_alloc_nozero(target->len);
-    ck_read(fd, new_buf, target->len, target->fname);
-    close(fd);
-
-    fuzz_py(out_buf, len, new_buf, target->len, &retbuf, &retlen);
-
-    ck_free(new_buf);
-
-    if (retbuf) {
-      if (!retlen)
-        goto abandon_entry;
-
-      if (common_fuzz_stuff(argv, retbuf, retlen)) {
-        free(retbuf);
-        goto abandon_entry;
-      }
-
-      /* Reset retbuf/retlen */
-      free(retbuf);
-      retbuf = NULL;
-      retlen = 0;
-
-      /* If we're finding new stuff, let's run for a bit longer, limits
-         permitting. */
-
-      if (queued_paths != havoc_queued) {
-        if (perf_score <= havoc_max_mult * 100) {
-          stage_max  *= 2;
-          perf_score *= 2;
-        }
-
-        havoc_queued = queued_paths;
-      }
-    }
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  stage_finds[STAGE_PYTHON]  += new_hit_cnt - orig_hit_cnt;
-  stage_cycles[STAGE_PYTHON] += stage_max;
-
-  if (python_only) {
-    /* Skip other stages */
-    ret_val = 0;
-    goto abandon_entry;
-  }
-#endif
-
-  /****************
-   * RANDOM HAVOC *
-   ****************/
-
-havoc_stage:
-
-  stage_cur_byte = -1;
-
-  /* The havoc stage mutation code is also invoked when splicing files; if the
-     splice_cycle variable is set, generate different descriptions and such. */
-
-  if (!splice_cycle) {
-
-    stage_name  = "havoc";
-    stage_short = "havoc";
-    stage_max   = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
-                  perf_score / havoc_div / 100;
-
-  } else {
-
-    static u8 tmp[32];
-
-    perf_score = orig_perf;
-
-    sprintf(tmp, "splice %u", splice_cycle);
-    stage_name  = tmp;
-    stage_short = "splice";
-    stage_max   = SPLICE_HAVOC * perf_score / havoc_div / 100;
-
-  }
-
-  if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
-
-  temp_len = len;
-
-  orig_hit_cnt = queued_paths + unique_crashes;
-
-  havoc_queued = queued_paths;
-
-  /* We essentially just do several thousand runs (depending on perf_score)
-     where we take the input file and make random stacked tweaks. */
-
-  for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-    u32 use_stacking = 1 << (1 + UR(HAVOC_STACK_POW2));
-
-    stage_cur_val = use_stacking;
- 
-    for (i = 0; i < use_stacking; ++i) {
-
-      switch (UR(15 + ((extras_cnt + a_extras_cnt) ? 2 : 0))) {
-
-        case 0:
-
-          /* Flip a single bit somewhere. Spooky! */
-
-          FLIP_BIT(out_buf, UR(temp_len << 3));
-          break;
-
-        case 1: 
-
-          /* Set byte to interesting value. */
-
-          out_buf[UR(temp_len)] = interesting_8[UR(sizeof(interesting_8))];
-          break;
-
-        case 2:
-
-          /* Set word to interesting value, randomly choosing endian. */
-
-          if (temp_len < 2) break;
-
-          if (UR(2)) {
-
-            *(u16*)(out_buf + UR(temp_len - 1)) =
-              interesting_16[UR(sizeof(interesting_16) >> 1)];
-
-          } else {
-
-            *(u16*)(out_buf + UR(temp_len - 1)) = SWAP16(
-              interesting_16[UR(sizeof(interesting_16) >> 1)]);
-
-          }
-
-          break;
-
-        case 3:
-
-          /* Set dword to interesting value, randomly choosing endian. */
-
-          if (temp_len < 4) break;
-
-          if (UR(2)) {
-  
-            *(u32*)(out_buf + UR(temp_len - 3)) =
-              interesting_32[UR(sizeof(interesting_32) >> 2)];
-
-          } else {
-
-            *(u32*)(out_buf + UR(temp_len - 3)) = SWAP32(
-              interesting_32[UR(sizeof(interesting_32) >> 2)]);
-
-          }
-
-          break;
-
-        case 4:
-
-          /* Randomly subtract from byte. */
-
-          out_buf[UR(temp_len)] -= 1 + UR(ARITH_MAX);
-          break;
-
-        case 5:
-
-          /* Randomly add to byte. */
-
-          out_buf[UR(temp_len)] += 1 + UR(ARITH_MAX);
-          break;
-
-        case 6:
-
-          /* Randomly subtract from word, random endian. */
-
-          if (temp_len < 2) break;
-
-          if (UR(2)) {
-
-            u32 pos = UR(temp_len - 1);
-
-            *(u16*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
-
-          } else {
-
-            u32 pos = UR(temp_len - 1);
-            u16 num = 1 + UR(ARITH_MAX);
-
-            *(u16*)(out_buf + pos) =
-              SWAP16(SWAP16(*(u16*)(out_buf + pos)) - num);
-
-          }
-
-          break;
-
-        case 7:
-
-          /* Randomly add to word, random endian. */
-
-          if (temp_len < 2) break;
-
-          if (UR(2)) {
-
-            u32 pos = UR(temp_len - 1);
-
-            *(u16*)(out_buf + pos) += 1 + UR(ARITH_MAX);
-
-          } else {
-
-            u32 pos = UR(temp_len - 1);
-            u16 num = 1 + UR(ARITH_MAX);
-
-            *(u16*)(out_buf + pos) =
-              SWAP16(SWAP16(*(u16*)(out_buf + pos)) + num);
-
-          }
-
-          break;
-
-        case 8:
-
-          /* Randomly subtract from dword, random endian. */
-
-          if (temp_len < 4) break;
-
-          if (UR(2)) {
-
-            u32 pos = UR(temp_len - 3);
-
-            *(u32*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
-
-          } else {
-
-            u32 pos = UR(temp_len - 3);
-            u32 num = 1 + UR(ARITH_MAX);
-
-            *(u32*)(out_buf + pos) =
-              SWAP32(SWAP32(*(u32*)(out_buf + pos)) - num);
-
-          }
-
-          break;
-
-        case 9:
-
-          /* Randomly add to dword, random endian. */
-
-          if (temp_len < 4) break;
-
-          if (UR(2)) {
-
-            u32 pos = UR(temp_len - 3);
-
-            *(u32*)(out_buf + pos) += 1 + UR(ARITH_MAX);
-
-          } else {
-
-            u32 pos = UR(temp_len - 3);
-            u32 num = 1 + UR(ARITH_MAX);
-
-            *(u32*)(out_buf + pos) =
-              SWAP32(SWAP32(*(u32*)(out_buf + pos)) + num);
-
-          }
-
-          break;
-
-        case 10:
-
-          /* Just set a random byte to a random value. Because,
-             why not. We use XOR with 1-255 to eliminate the
-             possibility of a no-op. */
-
-          out_buf[UR(temp_len)] ^= 1 + UR(255);
-          break;
-
-        case 11 ... 12: {
-
-            /* Delete bytes. We're making this a bit more likely
-               than insertion (the next option) in hopes of keeping
-               files reasonably small. */
-
-            u32 del_from, del_len;
-
-            if (temp_len < 2) break;
-
-            /* Don't delete too much. */
-
-            del_len = choose_block_len(temp_len - 1);
-
-            del_from = UR(temp_len - del_len + 1);
-
-            memmove(out_buf + del_from, out_buf + del_from + del_len,
-                    temp_len - del_from - del_len);
-
-            temp_len -= del_len;
-
-            break;
-
-          }
-
-        case 13:
-
-          if (temp_len + HAVOC_BLK_XL < MAX_FILE) {
-
-            /* Clone bytes (75%) or insert a block of constant bytes (25%). */
-
-            u8  actually_clone = UR(4);
-            u32 clone_from, clone_to, clone_len;
-            u8* new_buf;
-
-            if (actually_clone) {
-
-              clone_len  = choose_block_len(temp_len);
-              clone_from = UR(temp_len - clone_len + 1);
-
-            } else {
-
-              clone_len = choose_block_len(HAVOC_BLK_XL);
-              clone_from = 0;
-
-            }
-
-            clone_to   = UR(temp_len);
-
-            new_buf = ck_alloc_nozero(temp_len + clone_len);
-
-            /* Head */
-
-            memcpy(new_buf, out_buf, clone_to);
-
-            /* Inserted part */
-
-            if (actually_clone)
-              memcpy(new_buf + clone_to, out_buf + clone_from, clone_len);
-            else
-              memset(new_buf + clone_to,
-                     UR(2) ? UR(256) : out_buf[UR(temp_len)], clone_len);
-
-            /* Tail */
-            memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
-                   temp_len - clone_to);
-
-            ck_free(out_buf);
-            out_buf = new_buf;
-            temp_len += clone_len;
-
-          }
-
-          break;
-
-        case 14: {
-
-            /* Overwrite bytes with a randomly selected chunk (75%) or fixed
-               bytes (25%). */
-
-            u32 copy_from, copy_to, copy_len;
-
-            if (temp_len < 2) break;
-
-            copy_len  = choose_block_len(temp_len - 1);
-
-            copy_from = UR(temp_len - copy_len + 1);
-            copy_to   = UR(temp_len - copy_len + 1);
-
-            if (UR(4)) {
-
-              if (copy_from != copy_to)
-                memmove(out_buf + copy_to, out_buf + copy_from, copy_len);
-
-            } else memset(out_buf + copy_to,
-                          UR(2) ? UR(256) : out_buf[UR(temp_len)], copy_len);
-
-            break;
-
-          }
-
-        /* Values 15 and 16 can be selected only if there are any extras
-           present in the dictionaries. */
-
-        case 15: {
-
-            /* Overwrite bytes with an extra. */
-
-            if (!extras_cnt || (a_extras_cnt && UR(2))) {
-
-              /* No user-specified extras or odds in our favor. Let's use an
-                 auto-detected one. */
-
-              u32 use_extra = UR(a_extras_cnt);
-              u32 extra_len = a_extras[use_extra].len;
-              u32 insert_at;
-
-              if (extra_len > temp_len) break;
-
-              insert_at = UR(temp_len - extra_len + 1);
-              memcpy(out_buf + insert_at, a_extras[use_extra].data, extra_len);
-
-            } else {
-
-              /* No auto extras or odds in our favor. Use the dictionary. */
-
-              u32 use_extra = UR(extras_cnt);
-              u32 extra_len = extras[use_extra].len;
-              u32 insert_at;
-
-              if (extra_len > temp_len) break;
-
-              insert_at = UR(temp_len - extra_len + 1);
-              memcpy(out_buf + insert_at, extras[use_extra].data, extra_len);
-
-            }
-
-            break;
-
-          }
-
-        case 16: {
-
-            u32 use_extra, extra_len, insert_at = UR(temp_len + 1);
-            u8* new_buf;
-
-            /* Insert an extra. Do the same dice-rolling stuff as for the
-               previous case. */
-
-            if (!extras_cnt || (a_extras_cnt && UR(2))) {
-
-              use_extra = UR(a_extras_cnt);
-              extra_len = a_extras[use_extra].len;
-
-              if (temp_len + extra_len >= MAX_FILE) break;
-
-              new_buf = ck_alloc_nozero(temp_len + extra_len);
-
-              /* Head */
-              memcpy(new_buf, out_buf, insert_at);
-
-              /* Inserted part */
-              memcpy(new_buf + insert_at, a_extras[use_extra].data, extra_len);
-
-	    } else {
-
-              use_extra = UR(extras_cnt);
-              extra_len = extras[use_extra].len;
-
-              if (temp_len + extra_len >= MAX_FILE) break;
-
-              new_buf = ck_alloc_nozero(temp_len + extra_len);
-
-              /* Head */
-              memcpy(new_buf, out_buf, insert_at);
-
-              /* Inserted part */
-              memcpy(new_buf + insert_at, extras[use_extra].data, extra_len);
-
-            }
-
-            /* Tail */
-            memcpy(new_buf + insert_at + extra_len, out_buf + insert_at,
-                   temp_len - insert_at);
-
-            ck_free(out_buf);
-            out_buf   = new_buf;
-            temp_len += extra_len;
-
-            break;
-
-          }
-
-      }
-
-    }
-
-    if (common_fuzz_stuff(argv, out_buf, temp_len))
-      goto abandon_entry;
-
-    /* out_buf might have been mangled a bit, so let's restore it to its
-       original size and shape. */
-
-    if (temp_len < len) out_buf = ck_realloc(out_buf, len);
-    temp_len = len;
-    memcpy(out_buf, in_buf, len);
-
-    /* If we're finding new stuff, let's run for a bit longer, limits
-       permitting. */
-
-    if (queued_paths != havoc_queued) {
-
-      if (perf_score <= havoc_max_mult * 100) {
-        stage_max  *= 2;
-        perf_score *= 2;
-      }
-
-      havoc_queued = queued_paths;
-
-    }
-
-  }
-
-  new_hit_cnt = queued_paths + unique_crashes;
-
-  if (!splice_cycle) {
-    stage_finds[STAGE_HAVOC]  += new_hit_cnt - orig_hit_cnt;
-    stage_cycles[STAGE_HAVOC] += stage_max;
-  } else {
-    stage_finds[STAGE_SPLICE]  += new_hit_cnt - orig_hit_cnt;
-    stage_cycles[STAGE_SPLICE] += stage_max;
-  }
-
-#ifndef IGNORE_FINDS
-
-  /************
-   * SPLICING *
-   ************/
-
-  /* This is a last-resort strategy triggered by a full round with no findings.
-     It takes the current input file, randomly selects another input, and
-     splices them together at some offset, then relies on the havoc
-     code to mutate that blob. */
-
-retry_splicing:
-
-  if (use_splicing && splice_cycle++ < SPLICE_CYCLES &&
-      queued_paths > 1 && queue_cur->len > 1) {
-
-    struct queue_entry* target;
-    u32 tid, split_at;
-    u8* new_buf;
-    s32 f_diff, l_diff;
-
-    /* First of all, if we've modified in_buf for havoc, let's clean that
-       up... */
-
-    if (in_buf != orig_in) {
-      ck_free(in_buf);
-      in_buf = orig_in;
-      len = queue_cur->len;
-    }
-
-    /* Pick a random queue entry and seek to it. Don't splice with yourself. */
-
-    do { tid = UR(queued_paths); } while (tid == current_entry);
-
-    splicing_with = tid;
-    target = queue;
-
-    while (tid >= 100) { target = target->next_100; tid -= 100; }
-    while (tid--) target = target->next;
-
-    /* Make sure that the target has a reasonable length. */
-
-    while (target && (target->len < 2 || target == queue_cur)) {
-      target = target->next;
-      ++splicing_with;
-    }
-
-    if (!target) goto retry_splicing;
-
-    /* Read the testcase into a new buffer. */
-
-    fd = open(target->fname, O_RDONLY);
-
-    if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
-
-    new_buf = ck_alloc_nozero(target->len);
-
-    ck_read(fd, new_buf, target->len, target->fname);
-
-    close(fd);
-
-    /* Find a suitable splicing location, somewhere between the first and
-       the last differing byte. Bail out if the difference is just a single
-       byte or so. */
-
-    locate_diffs(in_buf, new_buf, MIN(len, target->len), &f_diff, &l_diff);
-
-    if (f_diff < 0 || l_diff < 2 || f_diff == l_diff) {
-      ck_free(new_buf);
-      goto retry_splicing;
-    }
-
-    /* Split somewhere between the first and last differing byte. */
-
-    split_at = f_diff + UR(l_diff - f_diff);
-
-    /* Do the thing. */
-
-    len = target->len;
-    memcpy(new_buf, in_buf, split_at);
-    in_buf = new_buf;
-
-    ck_free(out_buf);
-    out_buf = ck_alloc_nozero(len);
-    memcpy(out_buf, in_buf, len);
-
-#ifdef USE_PYTHON
-    goto python_stage;
-#else
-    goto havoc_stage;
-#endif
-
-  }
-
-#endif /* !IGNORE_FINDS */
-
-  ret_val = 0;
-
-abandon_entry:
-
-  splicing_with = -1;
-
-  /* Update pending_not_fuzzed count if we made it through the calibration
-     cycle and have not seen this entry before. */
-
-  if (!stop_soon && !queue_cur->cal_failed && (queue_cur->was_fuzzed == 0 || queue_cur->fuzz_level == 0)) {
-    --pending_not_fuzzed;
-    queue_cur->was_fuzzed = 1;
-    if (queue_cur->favored) --pending_favored;
-  }
-
-  ++queue_cur->fuzz_level;
-
-  munmap(orig_in, queue_cur->len);
-
-  if (in_buf != orig_in) ck_free(in_buf);
-  ck_free(out_buf);
-  ck_free(eff_map);
-
-  return ret_val;
-
-#undef FLIP_BIT
-
-}
-
-/* MOpt mode */
-static u8 pilot_fuzzing(char** argv) {
-
-	s32 len, fd, temp_len, i, j;
-	u8  *in_buf, *out_buf, *orig_in, *ex_tmp, *eff_map = 0;
-	u64 havoc_queued, orig_hit_cnt, new_hit_cnt, cur_ms_lv;
-	u32 splice_cycle = 0, perf_score = 100, orig_perf, prev_cksum, eff_cnt = 1;
-
-	u8  ret_val = 1, doing_det = 0;
-
-	u8  a_collect[MAX_AUTO_EXTRA];
-	u32 a_len = 0;
-
-#ifdef IGNORE_FINDS
-
-	/* In IGNORE_FINDS mode, skip any entries that weren't in the
-	   initial data set. */
-
-	if (queue_cur->depth > 1) return 1;
-
-#else
-
-	if (pending_favored) {
-
-		/* If we have any favored, non-fuzzed new arrivals in the queue,
-		   possibly skip to them at the expense of already-fuzzed or non-favored
-		   cases. */
-
-		if ((queue_cur->was_fuzzed || !queue_cur->favored) &&
-			UR(100) < SKIP_TO_NEW_PROB) return 1;
-
-	}
-	else if (!dumb_mode && !queue_cur->favored && queued_paths > 10) {
-
-		/* Otherwise, still possibly skip non-favored cases, albeit less often.
-		   The odds of skipping stuff are higher for already-fuzzed inputs and
-		   lower for never-fuzzed entries. */
-
-		if (queue_cycle > 1 && !queue_cur->was_fuzzed) {
-
-			if (UR(100) < SKIP_NFAV_NEW_PROB) return 1;
-
-		}
-		else {
-
-			if (UR(100) < SKIP_NFAV_OLD_PROB) return 1;
-
-		}
-
-	}
-
-#endif /* ^IGNORE_FINDS */
-
-	if (not_on_tty) {
-		ACTF("Fuzzing test case #%u (%u total, %llu uniq crashes found)...",
-			current_entry, queued_paths, unique_crashes);
-		fflush(stdout);
-	}
-
-	/* Map the test case into memory. */
-
-	fd = open(queue_cur->fname, O_RDONLY);
-
-	if (fd < 0) PFATAL("Unable to open '%s'", queue_cur->fname);
-
-	len = queue_cur->len;
-
-	orig_in = in_buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-
-	if (orig_in == MAP_FAILED) PFATAL("Unable to mmap '%s'", queue_cur->fname);
-
-	close(fd);
-
-	/* We could mmap() out_buf as MAP_PRIVATE, but we end up clobbering every
-	   single byte anyway, so it wouldn't give us any performance or memory usage
-	   benefits. */
-
-	out_buf = ck_alloc_nozero(len);
-
-	subseq_tmouts = 0;
-
-	cur_depth = queue_cur->depth;
-
-	/*******************************************
-	 * CALIBRATION (only if failed earlier on) *
-	 *******************************************/
-
-	if (queue_cur->cal_failed) {
-
-		u8 res = FAULT_TMOUT;
-
-		if (queue_cur->cal_failed < CAL_CHANCES) {
-
-			res = calibrate_case(argv, queue_cur, in_buf, queue_cycle - 1, 0);
-
-			if (res == FAULT_ERROR)
-				FATAL("Unable to execute target application");
-
-		}
-
-		if (stop_soon || res != crash_mode) {
-			++cur_skipped_paths;
-			goto abandon_entry;
-		}
-
-	}
-
-	/************
-	 * TRIMMING *
-	 ************/
-
-	if (!dumb_mode && !queue_cur->trim_done) {
-
-		u8 res = trim_case(argv, queue_cur, in_buf);
-
-		if (res == FAULT_ERROR)
-			FATAL("Unable to execute target application");
-
-		if (stop_soon) {
-			++cur_skipped_paths;
-			goto abandon_entry;
-		}
-
-		/* Don't retry trimming, even if it failed. */
-
-		queue_cur->trim_done = 1;
-
-		len = queue_cur->len;
-
-	}
-
-	memcpy(out_buf, in_buf, len);
-
-	/*********************
-	 * PERFORMANCE SCORE *
-	 *********************/
-
-	orig_perf = perf_score = calculate_score(queue_cur);
-
-	/* Skip right away if -d is given, if we have done deterministic fuzzing on
-	   this entry ourselves (was_fuzzed), or if it has gone through deterministic
-	   testing in earlier, resumed runs (passed_det). */
-
-	if (skip_deterministic || queue_cur->was_fuzzed || queue_cur->passed_det)
-		goto havoc_stage;
-
-	/* Skip deterministic fuzzing if exec path checksum puts this out of scope
-	   for this master instance. */
-
-	if (master_max && (queue_cur->exec_cksum % master_max) != master_id - 1)
-		goto havoc_stage;
-
-
-	cur_ms_lv = get_cur_time();
-	if (!(key_puppet == 0 && ((cur_ms_lv - last_path_time < limit_time_puppet) ||
-		(last_crash_time != 0 && cur_ms_lv - last_crash_time < limit_time_puppet) || last_path_time == 0)))
-	{
-		key_puppet = 1;
-		goto pacemaker_fuzzing;
-	}
-
-	doing_det = 1;
-
-		/*********************************************
-		 * SIMPLE BITFLIP (+dictionary construction) *
-		 *********************************************/
-
-#define FLIP_BIT(_ar, _b) do { \
-    u8* _arf = (u8*)(_ar); \
-    u32 _bf = (_b); \
-    _arf[(_bf) >> 3] ^= (128 >> ((_bf) & 7)); \
-  } while (0)
-
-		 /* Single walking bit. */
-
-		stage_short = "flip1";
-		stage_max = len << 3;
-		stage_name = "bitflip 1/1";
-
-
-
-
-		stage_val_type = STAGE_VAL_NONE;
-
-		orig_hit_cnt = queued_paths + unique_crashes;
-
-		prev_cksum = queue_cur->exec_cksum;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur >> 3;
-
-			FLIP_BIT(out_buf, stage_cur);
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			FLIP_BIT(out_buf, stage_cur);
-
-			/* While flipping the least significant bit in every byte, pull of an extra
-			   trick to detect possible syntax tokens. In essence, the idea is that if
-			   you have a binary blob like this:
-
-			   xxxxxxxxIHDRxxxxxxxx
-
-			   ...and changing the leading and trailing bytes causes variable or no
-			   changes in program flow, but touching any character in the "IHDR" string
-			   always produces the same, distinctive path, it's highly likely that
-			   "IHDR" is an atomically-checked magic value of special significance to
-			   the fuzzed format.
-
-			   We do this here, rather than as a separate stage, because it's a nice
-			   way to keep the operation approximately "free" (i.e., no extra execs).
-
-			   Empirically, performing the check when flipping the least significant bit
-			   is advantageous, compared to doing it at the time of more disruptive
-			   changes, where the program flow may be affected in more violent ways.
-
-			   The caveat is that we won't generate dictionaries in the -d mode or -S
-			   mode - but that's probably a fair trade-off.
-
-			   This won't work particularly well with paths that exhibit variable
-			   behavior, but fails gracefully, so we'll carry out the checks anyway.
-
-			  */
-
-			if (!dumb_mode && (stage_cur & 7) == 7) {
-
-				u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-				if (stage_cur == stage_max - 1 && cksum == prev_cksum) {
-
-					/* If at end of file and we are still collecting a string, grab the
-					   final character and force output. */
-
-					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
-					++a_len;
-
-					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
-						maybe_add_auto(a_collect, a_len);
-
-				}
-				else if (cksum != prev_cksum) {
-
-					/* Otherwise, if the checksum has changed, see if we have something
-					   worthwhile queued up, and collect that if the answer is yes. */
-
-					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
-						maybe_add_auto(a_collect, a_len);
-
-					a_len = 0;
-					prev_cksum = cksum;
-
-				}
-
-				/* Continue collecting string, but only if the bit flip actually made
-				   any difference - we don't want no-op tokens. */
-
-				if (cksum != queue_cur->exec_cksum) {
-
-					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
-					++a_len;
-
-				}
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP1] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP1] += stage_max;
-
-		/* Two walking bits. */
-
-		stage_name = "bitflip 2/1";
-		stage_short = "flip2";
-		stage_max = (len << 3) - 1;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur >> 3;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP2] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP2] += stage_max;
-
-
-
-		/* Four walking bits. */
-
-		stage_name = "bitflip 4/1";
-		stage_short = "flip4";
-		stage_max = (len << 3) - 3;
-
-
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur >> 3;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-			FLIP_BIT(out_buf, stage_cur + 2);
-			FLIP_BIT(out_buf, stage_cur + 3);
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-			FLIP_BIT(out_buf, stage_cur + 2);
-			FLIP_BIT(out_buf, stage_cur + 3);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP4] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP4] += stage_max;
-
-
-
-
-		/* Effector map setup. These macros calculate:
-
-		   EFF_APOS      - position of a particular file offset in the map.
-		   EFF_ALEN      - length of a map with a particular number of bytes.
-		   EFF_SPAN_ALEN - map span for a sequence of bytes.
-
-		 */
-
-#define EFF_APOS(_p)          ((_p) >> EFF_MAP_SCALE2)
-#define EFF_REM(_x)           ((_x) & ((1 << EFF_MAP_SCALE2) - 1))
-#define EFF_ALEN(_l)          (EFF_APOS(_l) + !!EFF_REM(_l))
-#define EFF_SPAN_ALEN(_p, _l) (EFF_APOS((_p) + (_l) - 1) - EFF_APOS(_p) + 1)
-
-		 /* Initialize effector map for the next step (see comments below). Always
-			flag first and last byte as doing something. */
-
-		eff_map = ck_alloc(EFF_ALEN(len));
-		eff_map[0] = 1;
-
-		if (EFF_APOS(len - 1) != 0) {
-			eff_map[EFF_APOS(len - 1)] = 1;
-			++eff_cnt;
-		}
-
-		/* Walking byte. */
-
-		stage_name = "bitflip 8/8";
-		stage_short = "flip8";
-		stage_max = len;
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur;
-
-			out_buf[stage_cur] ^= 0xFF;
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			/* We also use this stage to pull off a simple trick: we identify
-			   bytes that seem to have no effect on the current execution path
-			   even when fully flipped - and we skip them during more expensive
-			   deterministic stages, such as arithmetics or known ints. */
-
-			if (!eff_map[EFF_APOS(stage_cur)]) {
-
-				u32 cksum;
-
-				/* If in dumb mode or if the file is very short, just flag everything
-				   without wasting time on checksums. */
-
-				if (!dumb_mode && len >= EFF_MIN_LEN)
-					cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-				else
-					cksum = ~queue_cur->exec_cksum;
-
-				if (cksum != queue_cur->exec_cksum) {
-					eff_map[EFF_APOS(stage_cur)] = 1;
-					++eff_cnt;
-				}
-
-			}
-
-			out_buf[stage_cur] ^= 0xFF;
-
-		}
-
-		/* If the effector map is more than EFF_MAX_PERC dense, just flag the
-		   whole thing as worth fuzzing, since we wouldn't be saving much time
-		   anyway. */
-
-		if (eff_cnt != EFF_ALEN(len) &&
-			eff_cnt * 100 / EFF_ALEN(len) > EFF_MAX_PERC) {
-
-			memset(eff_map, 1, EFF_ALEN(len));
-
-			blocks_eff_select += EFF_ALEN(len);
-
-		}
-		else {
-
-			blocks_eff_select += eff_cnt;
-
-		}
-
-		blocks_eff_total += EFF_ALEN(len);
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP8] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP8] += stage_max;
-
-
-
-
-
-		/* Two walking bytes. */
-
-		if (len < 2) goto skip_bitflip;
-
-		stage_name = "bitflip 16/8";
-		stage_short = "flip16";
-		stage_cur = 0;
-		stage_max = len - 1;
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 1; ++i) {
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-				--stage_max;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			*(u16*)(out_buf + i) ^= 0xFFFF;
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-			++stage_cur;
-
-			*(u16*)(out_buf + i) ^= 0xFFFF;
-
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP16] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP16] += stage_max;
-
-
-
-
-		if (len < 4) goto skip_bitflip;
-
-		/* Four walking bytes. */
-
-		stage_name = "bitflip 32/8";
-		stage_short = "flip32";
-		stage_cur = 0;
-		stage_max = len - 3;
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 3; ++i) {
-
-			/* Let's consult the effector map... */
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-				--stage_max;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-			++stage_cur;
-
-			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP32] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP32] += stage_max;
-
-
-
-
-
-
-	skip_bitflip:
-
-		if (no_arith) goto skip_arith;
-
-		/**********************
-		 * ARITHMETIC INC/DEC *
-		 **********************/
-
-		 /* 8-bit arithmetics. */
-
-		stage_name = "arith 8/8";
-		stage_short = "arith8";
-		stage_cur = 0;
-		stage_max = 2 * len * ARITH_MAX;
-
-
-
-
-		stage_val_type = STAGE_VAL_LE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len; ++i) {
-
-			u8 orig = out_buf[i];
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)]) {
-				stage_max -= 2 * ARITH_MAX;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 1; j <= ARITH_MAX; ++j) {
-
-				u8 r = orig ^ (orig + j);
-
-				/* Do arithmetic operations only if the result couldn't be a product
-				   of a bitflip. */
-
-				if (!could_be_bitflip(r)) {
-
-					stage_cur_val = j;
-					out_buf[i] = orig + j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				r = orig ^ (orig - j);
-
-				if (!could_be_bitflip(r)) {
-
-					stage_cur_val = -j;
-					out_buf[i] = orig - j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				out_buf[i] = orig;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_ARITH8] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_ARITH8] += stage_max;
-
-
-
-
-
-		/* 16-bit arithmetics, both endians. */
-
-		if (len < 2) goto skip_arith;
-
-		stage_name = "arith 16/8";
-		stage_short = "arith16";
-		stage_cur = 0;
-		stage_max = 4 * (len - 1) * ARITH_MAX;
-
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 1; ++i) {
-
-			u16 orig = *(u16*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-				stage_max -= 4 * ARITH_MAX;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 1; j <= ARITH_MAX; ++j) {
-
-				u16 r1 = orig ^ (orig + j),
-					r2 = orig ^ (orig - j),
-					r3 = orig ^ SWAP16(SWAP16(orig) + j),
-					r4 = orig ^ SWAP16(SWAP16(orig) - j);
-
-				/* Try little endian addition and subtraction first. Do it only
-				   if the operation would affect more than one byte (hence the
-				   & 0xff overflow checks) and if it couldn't be a product of
-				   a bitflip. */
-
-				stage_val_type = STAGE_VAL_LE;
-
-				if ((orig & 0xff) + j > 0xff && !could_be_bitflip(r1)) {
-
-					stage_cur_val = j;
-					*(u16*)(out_buf + i) = orig + j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((orig & 0xff) < j && !could_be_bitflip(r2)) {
-
-					stage_cur_val = -j;
-					*(u16*)(out_buf + i) = orig - j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				/* Big endian comes next. Same deal. */
-
-				stage_val_type = STAGE_VAL_BE;
-
-
-				if ((orig >> 8) + j > 0xff && !could_be_bitflip(r3)) {
-
-					stage_cur_val = j;
-					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) + j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((orig >> 8) < j && !could_be_bitflip(r4)) {
-
-					stage_cur_val = -j;
-					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) - j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				*(u16*)(out_buf + i) = orig;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_ARITH16] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_ARITH16] += stage_max;
-
-
-
-
-		/* 32-bit arithmetics, both endians. */
-
-		if (len < 4) goto skip_arith;
-
-		stage_name = "arith 32/8";
-		stage_short = "arith32";
-		stage_cur = 0;
-		stage_max = 4 * (len - 3) * ARITH_MAX;
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 3; ++i) {
-
-			u32 orig = *(u32*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-				stage_max -= 4 * ARITH_MAX;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 1; j <= ARITH_MAX; ++j) {
-
-				u32 r1 = orig ^ (orig + j),
-					r2 = orig ^ (orig - j),
-					r3 = orig ^ SWAP32(SWAP32(orig) + j),
-					r4 = orig ^ SWAP32(SWAP32(orig) - j);
-
-				/* Little endian first. Same deal as with 16-bit: we only want to
-				   try if the operation would have effect on more than two bytes. */
-
-				stage_val_type = STAGE_VAL_LE;
-
-				if ((orig & 0xffff) + j > 0xffff && !could_be_bitflip(r1)) {
-
-					stage_cur_val = j;
-					*(u32*)(out_buf + i) = orig + j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((orig & 0xffff) < j && !could_be_bitflip(r2)) {
-
-					stage_cur_val = -j;
-					*(u32*)(out_buf + i) = orig - j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					stage_cur++;
-
-				} else --stage_max;
-
-				/* Big endian next. */
-
-				stage_val_type = STAGE_VAL_BE;
-
-				if ((SWAP32(orig) & 0xffff) + j > 0xffff && !could_be_bitflip(r3)) {
-
-					stage_cur_val = j;
-					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) + j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((SWAP32(orig) & 0xffff) < j && !could_be_bitflip(r4)) {
-
-					stage_cur_val = -j;
-					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) - j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				*(u32*)(out_buf + i) = orig;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_ARITH32] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_ARITH32] += stage_max;
-
-
-
-
-	skip_arith:
-
-		/**********************
-		 * INTERESTING VALUES *
-		 **********************/
-
-		stage_name = "interest 8/8";
-		stage_short = "int8";
-		stage_cur = 0;
-		stage_max = len * sizeof(interesting_8);
-
-
-
-		stage_val_type = STAGE_VAL_LE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		/* Setting 8-bit integers. */
-
-		for (i = 0; i < len; ++i) {
-
-			u8 orig = out_buf[i];
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)]) {
-				stage_max -= sizeof(interesting_8);
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < sizeof(interesting_8); ++j) {
-
-				/* Skip if the value could be a product of bitflips or arithmetics. */
-
-				if (could_be_bitflip(orig ^ (u8)interesting_8[j]) ||
-					could_be_arith(orig, (u8)interesting_8[j], 1)) {
-					--stage_max;
-					continue;
-				}
-
-				stage_cur_val = interesting_8[j];
-				out_buf[i] = interesting_8[j];
-
-				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-				out_buf[i] = orig;
-				++stage_cur;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_INTEREST8] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_INTEREST8] += stage_max;
-
-
-
-
-		/* Setting 16-bit integers, both endians. */
-
-		if (no_arith || len < 2) goto skip_interest;
-
-		stage_name = "interest 16/8";
-		stage_short = "int16";
-		stage_cur = 0;
-		stage_max = 2 * (len - 1) * (sizeof(interesting_16) >> 1);
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 1; ++i) {
-
-			u16 orig = *(u16*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-				stage_max -= sizeof(interesting_16);
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
-
-				stage_cur_val = interesting_16[j];
-
-				/* Skip if this could be a product of a bitflip, arithmetics,
-				   or single-byte interesting value insertion. */
-
-				if (!could_be_bitflip(orig ^ (u16)interesting_16[j]) &&
-					!could_be_arith(orig, (u16)interesting_16[j], 2) &&
-					!could_be_interest(orig, (u16)interesting_16[j], 2, 0)) {
-
-					stage_val_type = STAGE_VAL_LE;
-
-					*(u16*)(out_buf + i) = interesting_16[j];
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((u16)interesting_16[j] != SWAP16(interesting_16[j]) &&
-					!could_be_bitflip(orig ^ SWAP16(interesting_16[j])) &&
-					!could_be_arith(orig, SWAP16(interesting_16[j]), 2) &&
-					!could_be_interest(orig, SWAP16(interesting_16[j]), 2, 1)) {
-
-					stage_val_type = STAGE_VAL_BE;
-
-					*(u16*)(out_buf + i) = SWAP16(interesting_16[j]);
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-			}
-
-			*(u16*)(out_buf + i) = orig;
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_INTEREST16] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_INTEREST16] += stage_max;
-
-
-
-
-
-		if (len < 4) goto skip_interest;
-
-		/* Setting 32-bit integers, both endians. */
-
-		stage_name = "interest 32/8";
-		stage_short = "int32";
-		stage_cur = 0;
-		stage_max = 2 * (len - 3) * (sizeof(interesting_32) >> 2);
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 3; ++i) {
-
-			u32 orig = *(u32*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-				stage_max -= sizeof(interesting_32) >> 1;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < sizeof(interesting_32) / 4; ++j) {
-
-				stage_cur_val = interesting_32[j];
-
-				/* Skip if this could be a product of a bitflip, arithmetics,
-				   or word interesting value insertion. */
-
-				if (!could_be_bitflip(orig ^ (u32)interesting_32[j]) &&
-					!could_be_arith(orig, interesting_32[j], 4) &&
-					!could_be_interest(orig, interesting_32[j], 4, 0)) {
-
-					stage_val_type = STAGE_VAL_LE;
-
-					*(u32*)(out_buf + i) = interesting_32[j];
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((u32)interesting_32[j] != SWAP32(interesting_32[j]) &&
-					!could_be_bitflip(orig ^ SWAP32(interesting_32[j])) &&
-					!could_be_arith(orig, SWAP32(interesting_32[j]), 4) &&
-					!could_be_interest(orig, SWAP32(interesting_32[j]), 4, 1)) {
-
-					stage_val_type = STAGE_VAL_BE;
-
-					*(u32*)(out_buf + i) = SWAP32(interesting_32[j]);
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-			}
-
-			*(u32*)(out_buf + i) = orig;
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_INTEREST32] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_INTEREST32] += stage_max;
-
-
-
-
-
-	skip_interest:
-
-		/********************
-		 * DICTIONARY STUFF *
-		 ********************/
-
-		if (!extras_cnt) goto skip_user_extras;
-
-		/* Overwrite with user-supplied extras. */
-
-		stage_name = "user extras (over)";
-		stage_short = "ext_UO";
-		stage_cur = 0;
-		stage_max = extras_cnt * len;
-
-
-
-
-		stage_val_type = STAGE_VAL_NONE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len; ++i) {
-
-			u32 last_len = 0;
-
-			stage_cur_byte = i;
-
-			/* Extras are sorted by size, from smallest to largest. This means
-			   that we don't have to worry about restoring the buffer in
-			   between writes at a particular offset determined by the outer
-			   loop. */
-
-			for (j = 0; j < extras_cnt; ++j) {
-
-				/* Skip extras probabilistically if extras_cnt > MAX_DET_EXTRAS. Also
-				   skip them if there's no room to insert the payload, if the token
-				   is redundant, or if its entire span has no bytes set in the effector
-				   map. */
-
-				if ((extras_cnt > MAX_DET_EXTRAS && UR(extras_cnt) >= MAX_DET_EXTRAS) ||
-					extras[j].len > len - i ||
-					!memcmp(extras[j].data, out_buf + i, extras[j].len) ||
-					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, extras[j].len))) {
-
-					--stage_max;
-					continue;
-
-				}
-
-				last_len = extras[j].len;
-				memcpy(out_buf + i, extras[j].data, last_len);
-
-				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-				++stage_cur;
-
-			}
-
-			/* Restore all the clobbered memory. */
-			memcpy(out_buf + i, in_buf + i, last_len);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_EXTRAS_UO] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_EXTRAS_UO] += stage_max;
-
-		/* Insertion of user-supplied extras. */
-
-		stage_name = "user extras (insert)";
-		stage_short = "ext_UI";
-		stage_cur = 0;
-		stage_max = extras_cnt * len;
-
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		ex_tmp = ck_alloc(len + MAX_DICT_FILE);
-
-		for (i = 0; i <= len; ++i) {
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < extras_cnt; ++j) {
-
-				if (len + extras[j].len > MAX_FILE) {
-					--stage_max;
-					continue;
-				}
-
-				/* Insert token */
-				memcpy(ex_tmp + i, extras[j].data, extras[j].len);
-
-				/* Copy tail */
-				memcpy(ex_tmp + i + extras[j].len, out_buf + i, len - i);
-
-				if (common_fuzz_stuff(argv, ex_tmp, len + extras[j].len)) {
-					ck_free(ex_tmp);
-					goto abandon_entry;
-				}
-
-				++stage_cur;
-
-			}
-
-			/* Copy head */
-			ex_tmp[i] = out_buf[i];
-
-		}
-
-		ck_free(ex_tmp);
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_EXTRAS_UI] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_EXTRAS_UI] += stage_max;
-
-	skip_user_extras:
-
-		if (!a_extras_cnt) goto skip_extras;
-
-		stage_name = "auto extras (over)";
-		stage_short = "ext_AO";
-		stage_cur = 0;
-		stage_max = MIN(a_extras_cnt, USE_AUTO_EXTRAS) * len;
-
-
-		stage_val_type = STAGE_VAL_NONE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len; ++i) {
-
-			u32 last_len = 0;
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < MIN(a_extras_cnt, USE_AUTO_EXTRAS); ++j) {
-
-				/* See the comment in the earlier code; extras are sorted by size. */
-
-				if (a_extras[j].len > len - i ||
-					!memcmp(a_extras[j].data, out_buf + i, a_extras[j].len) ||
-					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, a_extras[j].len))) {
-
-					--stage_max;
-					continue;
-
-				}
-
-				last_len = a_extras[j].len;
-				memcpy(out_buf + i, a_extras[j].data, last_len);
-
-				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-				++stage_cur;
-
-			}
-
-			/* Restore all the clobbered memory. */
-			memcpy(out_buf + i, in_buf + i, last_len);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_EXTRAS_AO] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_EXTRAS_AO] += stage_max;
-
-	skip_extras:
-
-		/* If we made this to here without jumping to havoc_stage or abandon_entry,
-		   we're properly done with deterministic steps and can mark it as such
-		   in the .state/ directory. */
-
-		if (!queue_cur->passed_det) mark_as_det_done(queue_cur);
-
-		/****************
-		 * RANDOM HAVOC *
-		 ****************/
-
-	havoc_stage:
-	pacemaker_fuzzing:
-
-
-		stage_cur_byte = -1;
-
-		/* The havoc stage mutation code is also invoked when splicing files; if the
-		   splice_cycle variable is set, generate different descriptions and such. */
-
-		if (!splice_cycle) {
-
-			stage_name = "MOpt-havoc";
-			stage_short = "MOpt_havoc";
-			stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
-				perf_score / havoc_div / 100;
-
-		}
-		else {
-
-			static u8 tmp[32];
-
-			perf_score = orig_perf;
-
-			sprintf(tmp, "MOpt-splice %u", splice_cycle);
-			stage_name = tmp;
-			stage_short = "MOpt_splice";
-			stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
-
-		}
-
-		s32 temp_len_puppet;
-		cur_ms_lv = get_cur_time();
-
-		{
-
-
-			if (key_puppet == 1)
-			{
-				if (unlikely(orig_hit_cnt_puppet == 0))
-				{
-					orig_hit_cnt_puppet = queued_paths + unique_crashes;
-					last_limit_time_start = get_cur_time();
-					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
-				}
-			}
-
-
-			{
-#ifndef IGNORE_FINDS
-			havoc_stage_puppet:
-#endif
-
-				stage_cur_byte = -1;
-
-				/* The havoc stage mutation code is also invoked when splicing files; if the
-				   splice_cycle variable is set, generate different descriptions and such. */
-
-				if (!splice_cycle) {
-
-					stage_name = "MOpt avoc";
-					stage_short = "MOpt_havoc";
-					stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
-						perf_score / havoc_div / 100;
-
-				}
-				else {
-					static u8 tmp[32];
-					perf_score = orig_perf;
-					sprintf(tmp, "MOpt splice %u", splice_cycle);
-					stage_name = tmp;
-					stage_short = "MOpt_splice";
-					stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
-				}
-
-
-
-				if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
-
-				temp_len = len;
-
-				orig_hit_cnt = queued_paths + unique_crashes;
-
-				havoc_queued = queued_paths;
-
-
-
-				for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-					u32 use_stacking = 1 << (1 + UR(HAVOC_STACK_POW2));
-
-					stage_cur_val = use_stacking;
-
-
-					for (i = 0; i < operator_num; ++i)
-					{
-						stage_cycles_puppet_v3[swarm_now][i] = stage_cycles_puppet_v2[swarm_now][i];
-					}
-
-
-					for (i = 0; i < use_stacking; ++i) {
-
-						switch (select_algorithm()) {
-
-						case 0:
-							/* Flip a single bit somewhere. Spooky! */
-							FLIP_BIT(out_buf, UR(temp_len << 3));
-							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP1] += 1;
-							break;
-
-
-						case 1:
-							if (temp_len < 2) break;
-							temp_len_puppet = UR(temp_len << 3);
-							FLIP_BIT(out_buf, temp_len_puppet);
-							FLIP_BIT(out_buf, temp_len_puppet + 1);
-							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP2] += 1;
-							break;
-
-						case 2:
-							if (temp_len < 2) break;
-							temp_len_puppet = UR(temp_len << 3);
-							FLIP_BIT(out_buf, temp_len_puppet);
-							FLIP_BIT(out_buf, temp_len_puppet + 1);
-							FLIP_BIT(out_buf, temp_len_puppet + 2);
-							FLIP_BIT(out_buf, temp_len_puppet + 3);
-							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP4] += 1;
-							break;
-
-						case 3:
-							if (temp_len < 4) break;
-							out_buf[UR(temp_len)] ^= 0xFF;
-							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP8] += 1;
-							break;
-
-						case 4:
-							if (temp_len < 8) break;
-							*(u16*)(out_buf + UR(temp_len - 1)) ^= 0xFFFF;
-							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP16] += 1;
-							break;
-
-						case 5:
-							if (temp_len < 8) break;
-							*(u32*)(out_buf + UR(temp_len - 3)) ^= 0xFFFFFFFF;
-							stage_cycles_puppet_v2[swarm_now][STAGE_FLIP32] += 1;
-							break;
-
-						case 6:
-							out_buf[UR(temp_len)] -= 1 + UR(ARITH_MAX);
-							out_buf[UR(temp_len)] += 1 + UR(ARITH_MAX);
-							stage_cycles_puppet_v2[swarm_now][STAGE_ARITH8] += 1;
-							break;
-
-						case 7:
-							/* Randomly subtract from word, random endian. */
-							if (temp_len < 8) break;
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 1);
-								*(u16*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
-							}
-							else {
-								u32 pos = UR(temp_len - 1);
-								u16 num = 1 + UR(ARITH_MAX);
-								*(u16*)(out_buf + pos) =
-									SWAP16(SWAP16(*(u16*)(out_buf + pos)) - num);
-							}
-							/* Randomly add to word, random endian. */
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 1);
-								*(u16*)(out_buf + pos) += 1 + UR(ARITH_MAX);
-							}
-							else {
-								u32 pos = UR(temp_len - 1);
-								u16 num = 1 + UR(ARITH_MAX);
-								*(u16*)(out_buf + pos) =
-									SWAP16(SWAP16(*(u16*)(out_buf + pos)) + num);
-							}
-							stage_cycles_puppet_v2[swarm_now][STAGE_ARITH16] += 1;
-							break;
-
-
-						case 8:
-							/* Randomly subtract from dword, random endian. */
-							if (temp_len < 8) break;
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 3);
-								*(u32*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
-							}
-							else {
-								u32 pos = UR(temp_len - 3);
-								u32 num = 1 + UR(ARITH_MAX);
-								*(u32*)(out_buf + pos) =
-									SWAP32(SWAP32(*(u32*)(out_buf + pos)) - num);
-							}
-							/* Randomly add to dword, random endian. */
-							//if (temp_len < 4) break;
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 3);
-								*(u32*)(out_buf + pos) += 1 + UR(ARITH_MAX);
-							}
-							else {
-								u32 pos = UR(temp_len - 3);
-								u32 num = 1 + UR(ARITH_MAX);
-								*(u32*)(out_buf + pos) =
-									SWAP32(SWAP32(*(u32*)(out_buf + pos)) + num);
-							}
-							stage_cycles_puppet_v2[swarm_now][STAGE_ARITH32] += 1;
-							break;
-
-
-						case 9:
-							/* Set byte to interesting value. */
-							if (temp_len < 4) break;
-							out_buf[UR(temp_len)] = interesting_8[UR(sizeof(interesting_8))];
-							stage_cycles_puppet_v2[swarm_now][STAGE_INTEREST8] += 1;
-							break;
-
-						case 10:
-							/* Set word to interesting value, randomly choosing endian. */
-							if (temp_len < 8) break;
-							if (UR(2)) {
-								*(u16*)(out_buf + UR(temp_len - 1)) =
-									interesting_16[UR(sizeof(interesting_16) >> 1)];
-							}
-							else {
-								*(u16*)(out_buf + UR(temp_len - 1)) = SWAP16(
-									interesting_16[UR(sizeof(interesting_16) >> 1)]);
-							}
-							stage_cycles_puppet_v2[swarm_now][STAGE_INTEREST16] += 1;
-							break;
-
-
-						case 11:
-							/* Set dword to interesting value, randomly choosing endian. */
-
-							if (temp_len < 8) break;
-
-							if (UR(2)) {
-								*(u32*)(out_buf + UR(temp_len - 3)) =
-									interesting_32[UR(sizeof(interesting_32) >> 2)];
-							}
-							else {
-								*(u32*)(out_buf + UR(temp_len - 3)) = SWAP32(
-									interesting_32[UR(sizeof(interesting_32) >> 2)]);
-							}
-							stage_cycles_puppet_v2[swarm_now][STAGE_INTEREST32] += 1;
-							break;
-
-
-						case 12:
-
-							/* Just set a random byte to a random value. Because,
-							   why not. We use XOR with 1-255 to eliminate the
-							   possibility of a no-op. */
-
-							out_buf[UR(temp_len)] ^= 1 + UR(255);
-							stage_cycles_puppet_v2[swarm_now][STAGE_RANDOMBYTE] += 1;
-							break;
-
-
-
-						case 13: {
-
-							/* Delete bytes. We're making this a bit more likely
-							   than insertion (the next option) in hopes of keeping
-							   files reasonably small. */
-
-							u32 del_from, del_len;
-
-							if (temp_len < 2) break;
-
-							/* Don't delete too much. */
-
-							del_len = choose_block_len(temp_len - 1);
-
-							del_from = UR(temp_len - del_len + 1);
-
-							memmove(out_buf + del_from, out_buf + del_from + del_len,
-								temp_len - del_from - del_len);
-
-							temp_len -= del_len;
-							stage_cycles_puppet_v2[swarm_now][STAGE_DELETEBYTE] += 1;
-							break;
-
-						}
-
-						case 14:
-
-							if (temp_len + HAVOC_BLK_XL < MAX_FILE) {
-
-								/* Clone bytes (75%) or insert a block of constant bytes (25%). */
-
-								u8  actually_clone = UR(4);
-								u32 clone_from, clone_to, clone_len;
-								u8* new_buf;
-
-								if (actually_clone) {
-
-									clone_len = choose_block_len(temp_len);
-									clone_from = UR(temp_len - clone_len + 1);
-
-								}
-								else {
-
-									clone_len = choose_block_len(HAVOC_BLK_XL);
-									clone_from = 0;
-
-								}
-
-								clone_to = UR(temp_len);
-
-								new_buf = ck_alloc_nozero(temp_len + clone_len);
-
-								/* Head */
-
-								memcpy(new_buf, out_buf, clone_to);
-
-								/* Inserted part */
-
-								if (actually_clone)
-									memcpy(new_buf + clone_to, out_buf + clone_from, clone_len);
-								else
-									memset(new_buf + clone_to,
-										UR(2) ? UR(256) : out_buf[UR(temp_len)], clone_len);
-
-								/* Tail */
-								memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
-									temp_len - clone_to);
-
-								ck_free(out_buf);
-								out_buf = new_buf;
-								temp_len += clone_len;
-								stage_cycles_puppet_v2[swarm_now][STAGE_Clone75] += 1;
-							}
-
-							break;
-
-						case 15: {
-
-							/* Overwrite bytes with a randomly selected chunk (75%) or fixed
-							   bytes (25%). */
-
-							u32 copy_from, copy_to, copy_len;
-
-							if (temp_len < 2) break;
-
-							copy_len = choose_block_len(temp_len - 1);
-
-							copy_from = UR(temp_len - copy_len + 1);
-							copy_to = UR(temp_len - copy_len + 1);
-
-							if (UR(4)) {
-
-								if (copy_from != copy_to)
-									memmove(out_buf + copy_to, out_buf + copy_from, copy_len);
-
-							}
-							else memset(out_buf + copy_to,
-								UR(2) ? UR(256) : out_buf[UR(temp_len)], copy_len);
-							stage_cycles_puppet_v2[swarm_now][STAGE_OverWrite75] += 1;
-							break;
-
-						}
-
-
-						}
-
-					}
-
-
-					tmp_pilot_time += 1;
-
-
-
-
-					u64 temp_total_found = queued_paths + unique_crashes;
-
-
-
-
-					if (common_fuzz_stuff(argv, out_buf, temp_len))
-						goto abandon_entry_puppet;
-
-					/* out_buf might have been mangled a bit, so let's restore it to its
-					   original size and shape. */
-
-					if (temp_len < len) out_buf = ck_realloc(out_buf, len);
-					temp_len = len;
-					memcpy(out_buf, in_buf, len);
-
-					/* If we're finding new stuff, let's run for a bit longer, limits
-					   permitting. */
-
-					if (queued_paths != havoc_queued) {
-
-						if (perf_score <= havoc_max_mult * 100) {
-							stage_max *= 2;
-							perf_score *= 2;
-						}
-
-						havoc_queued = queued_paths;
-
-					}
-
-					if (unlikely(queued_paths + unique_crashes > temp_total_found))
-					{
-						u64 temp_temp_puppet = queued_paths + unique_crashes - temp_total_found;
-						total_puppet_find = total_puppet_find + temp_temp_puppet;
-						for (i = 0; i < 16; ++i)
-						{
-							if (stage_cycles_puppet_v2[swarm_now][i] > stage_cycles_puppet_v3[swarm_now][i])
-								stage_finds_puppet_v2[swarm_now][i] += temp_temp_puppet;
-						}
-					}
-
-				}
-				new_hit_cnt = queued_paths + unique_crashes;
-
-				if (!splice_cycle) {
-          stage_finds[STAGE_HAVOC]  += new_hit_cnt - orig_hit_cnt;
-          stage_cycles[STAGE_HAVOC] += stage_max;
-        } else {
-          stage_finds[STAGE_SPLICE]  += new_hit_cnt - orig_hit_cnt;
-          stage_cycles[STAGE_SPLICE] += stage_max;
-        }
-
-#ifndef IGNORE_FINDS
-
-				/************
-				 * SPLICING *
-				 ************/
-
-
-			retry_splicing_puppet:
-
-				if (use_splicing && splice_cycle++ < SPLICE_CYCLES_puppet &&
-					queued_paths > 1 && queue_cur->len > 1) {
-
-					struct queue_entry* target;
-					u32 tid, split_at;
-					u8* new_buf;
-					s32 f_diff, l_diff;
-
-					/* First of all, if we've modified in_buf for havoc, let's clean that
-					   up... */
-
-					if (in_buf != orig_in) {
-						ck_free(in_buf);
-						in_buf = orig_in;
-						len = queue_cur->len;
-					}
-
-					/* Pick a random queue entry and seek to it. Don't splice with yourself. */
-
-					do { tid = UR(queued_paths); } while (tid == current_entry);
-
-					splicing_with = tid;
-					target = queue;
-
-					while (tid >= 100) { target = target->next_100; tid -= 100; }
-					while (tid--) target = target->next;
-
-					/* Make sure that the target has a reasonable length. */
-
-					while (target && (target->len < 2 || target == queue_cur)) {
-						target = target->next;
-						++splicing_with;
-					}
-
-					if (!target) goto retry_splicing_puppet;
-
-					/* Read the testcase into a new buffer. */
-
-					fd = open(target->fname, O_RDONLY);
-
-					if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
-
-					new_buf = ck_alloc_nozero(target->len);
-
-					ck_read(fd, new_buf, target->len, target->fname);
-
-					close(fd);
-
-					/* Find a suitable splicin g location, somewhere between the first and
-					   the last differing byte. Bail out if the difference is just a single
-					   byte or so. */
-
-					locate_diffs(in_buf, new_buf, MIN(len, target->len), &f_diff, &l_diff);
-
-					if (f_diff < 0 || l_diff < 2 || f_diff == l_diff) {
-						ck_free(new_buf);
-						goto retry_splicing_puppet;
-					}
-
-					/* Split somewhere between the first and last differing byte. */
-
-					split_at = f_diff + UR(l_diff - f_diff);
-
-					/* Do the thing. */
-
-					len = target->len;
-					memcpy(new_buf, in_buf, split_at);
-					in_buf = new_buf;
-					ck_free(out_buf);
-					out_buf = ck_alloc_nozero(len);
-					memcpy(out_buf, in_buf, len);
-					goto havoc_stage_puppet;
-
-				}
-
-#endif /* !IGNORE_FINDS */
-
-				ret_val = 0;
-
-			abandon_entry:
-			abandon_entry_puppet:
-
-				if (splice_cycle >= SPLICE_CYCLES_puppet)
-					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
-
-
-				splicing_with = -1;
-
-				/* Update pending_not_fuzzed count if we made it through the calibration
-				   cycle and have not seen this entry before. */
-
-				   // if (!stop_soon && !queue_cur->cal_failed && !queue_cur->was_fuzzed) {
-				   //   queue_cur->was_fuzzed = 1;
-				   //   --pending_not_fuzzed;
-				   //   if (queue_cur->favored) --pending_favored;
-				   // }
-
-				munmap(orig_in, queue_cur->len);
-
-				if (in_buf != orig_in) ck_free(in_buf);
-				ck_free(out_buf);
-				ck_free(eff_map);
-
-
-				if (key_puppet == 1) {
-					if (unlikely(queued_paths + unique_crashes > ((queued_paths + unique_crashes)*limit_time_bound + orig_hit_cnt_puppet)))	{
-						key_puppet = 0;
-						cur_ms_lv = get_cur_time();
-						new_hit_cnt = queued_paths + unique_crashes;
-						orig_hit_cnt_puppet = 0;
-						last_limit_time_start = 0;
-					}
-				}
-
-
-				if (unlikely(tmp_pilot_time > period_pilot)) {
-					total_pacemaker_time += tmp_pilot_time;
-					new_hit_cnt = queued_paths + unique_crashes;
-					swarm_fitness[swarm_now] = (double)(total_puppet_find - temp_puppet_find) / ((double)(tmp_pilot_time)/ period_pilot_tmp);
-					tmp_pilot_time = 0;
-					temp_puppet_find = total_puppet_find;
-
-					u64 temp_stage_finds_puppet = 0;
-					for (i = 0; i < operator_num; ++i) {
-						double temp_eff = 0.0;
-
-						if (stage_cycles_puppet_v2[swarm_now][i] > stage_cycles_puppet[swarm_now][i])
-							temp_eff = (double)(stage_finds_puppet_v2[swarm_now][i] - stage_finds_puppet[swarm_now][i]) /
-							(double)(stage_cycles_puppet_v2[swarm_now][i] - stage_cycles_puppet[swarm_now][i]);
-
-						if (eff_best[swarm_now][i] < temp_eff) {
-							eff_best[swarm_now][i] = temp_eff;
-							L_best[swarm_now][i] = x_now[swarm_now][i];
-						}
-
-						stage_finds_puppet[swarm_now][i] = stage_finds_puppet_v2[swarm_now][i];
-						stage_cycles_puppet[swarm_now][i] = stage_cycles_puppet_v2[swarm_now][i];
-						temp_stage_finds_puppet += stage_finds_puppet[swarm_now][i];
-					}
-
-					swarm_now = swarm_now + 1;
-						if (swarm_now == swarm_num) {
-							key_module = 1;
-							for (i = 0; i < operator_num; ++i) {
-								core_operator_cycles_puppet_v2[i] = core_operator_cycles_puppet[i];
-								core_operator_cycles_puppet_v3[i] = core_operator_cycles_puppet[i];
-								core_operator_finds_puppet_v2[i] = core_operator_finds_puppet[i];
-							}
-
-							double swarm_eff = 0.0;
-							swarm_now = 0;
-							for (i = 0; i < swarm_num; ++i)	{
-								if (swarm_fitness[i] > swarm_eff) {
-									swarm_eff = swarm_fitness[i];
-									swarm_now = i;
-								}
-							}
-							if (swarm_now <0 || swarm_now > swarm_num - 1)
-								PFATAL("swarm_now error number  %d", swarm_now);
-
-						}
-				}
-				return ret_val;
-			}
-		}
-
-
-#undef FLIP_BIT
-
-}
-
-
-static u8 core_fuzzing(char** argv) {
-	int i;
-
-	if (swarm_num == 1) {
-		key_module = 2;
-		return 0;
-	}
-
-
-		s32 len, fd, temp_len, j;
-		u8  *in_buf, *out_buf, *orig_in, *ex_tmp, *eff_map = 0;
-		u64 havoc_queued, orig_hit_cnt, new_hit_cnt, cur_ms_lv;
-		u32 splice_cycle = 0, perf_score = 100, orig_perf, prev_cksum, eff_cnt = 1;
-
-		u8  ret_val = 1, doing_det = 0;
-
-		u8  a_collect[MAX_AUTO_EXTRA];
-		u32 a_len = 0;
-
-#ifdef IGNORE_FINDS
-
-		/* In IGNORE_FINDS mode, skip any entries that weren't in the
-		   initial data set. */
-
-		if (queue_cur->depth > 1) return 1;
-
-#else
-
-		if (pending_favored) {
-
-			/* If we have any favored, non-fuzzed new arrivals in the queue,
-			   possibly skip to them at the expense of already-fuzzed or non-favored
-			   cases. */
-
-			if ((queue_cur->was_fuzzed || !queue_cur->favored) &&
-				UR(100) < SKIP_TO_NEW_PROB) return 1;
-
-		} else if (!dumb_mode && !queue_cur->favored && queued_paths > 10) {
-
-			/* Otherwise, still possibly skip non-favored cases, albeit less often.
-			   The odds of skipping stuff are higher for already-fuzzed inputs and
-			   lower for never-fuzzed entries. */
-
-			if (queue_cycle > 1 && !queue_cur->was_fuzzed) {
-
-				if (UR(100) < SKIP_NFAV_NEW_PROB) return 1;
-
-			} else {
-
-				if (UR(100) < SKIP_NFAV_OLD_PROB) return 1;
-
-			}
-
-		}
-
-#endif /* ^IGNORE_FINDS */
-
-		if (not_on_tty) {
-			ACTF("Fuzzing test case #%u (%u total, %llu uniq crashes found)...",
-				current_entry, queued_paths, unique_crashes);
-			fflush(stdout);
-		}
-
-		/* Map the test case into memory. */
-
-		fd = open(queue_cur->fname, O_RDONLY);
-
-		if (fd < 0) PFATAL("Unable to open '%s'", queue_cur->fname);
-
-		len = queue_cur->len;
-
-		orig_in = in_buf = mmap(0, len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
-
-		if (orig_in == MAP_FAILED) PFATAL("Unable to mmap '%s'", queue_cur->fname);
-
-		close(fd);
-
-		/* We could mmap() out_buf as MAP_PRIVATE, but we end up clobbering every
-		   single byte anyway, so it wouldn't give us any performance or memory usage
-		   benefits. */
-
-		out_buf = ck_alloc_nozero(len);
-
-		subseq_tmouts = 0;
-
-		cur_depth = queue_cur->depth;
-
-		/*******************************************
-		 * CALIBRATION (only if failed earlier on) *
-		 *******************************************/
-
-		if (queue_cur->cal_failed) {
-
-			u8 res = FAULT_TMOUT;
-
-			if (queue_cur->cal_failed < CAL_CHANCES) {
-
-				res = calibrate_case(argv, queue_cur, in_buf, queue_cycle - 1, 0);
-
-				if (res == FAULT_ERROR)
-					FATAL("Unable to execute target application");
-
-			}
-
-			if (stop_soon || res != crash_mode) {
-				++cur_skipped_paths;
-				goto abandon_entry;
-			}
-
-		}
-
-		/************
-		 * TRIMMING *
-		 ************/
-
-		if (!dumb_mode && !queue_cur->trim_done) {
-
-			u8 res = trim_case(argv, queue_cur, in_buf);
-
-			if (res == FAULT_ERROR)
-				FATAL("Unable to execute target application");
-
-			if (stop_soon) {
-				++cur_skipped_paths;
-				goto abandon_entry;
-			}
-
-			/* Don't retry trimming, even if it failed. */
-
-			queue_cur->trim_done = 1;
-
-			len = queue_cur->len;
-
-		}
-
-		memcpy(out_buf, in_buf, len);
-
-		/*********************
-		 * PERFORMANCE SCORE *
-		 *********************/
-
-		orig_perf = perf_score = calculate_score(queue_cur);
-
-		/* Skip right away if -d is given, if we have done deterministic fuzzing on
-		   this entry ourselves (was_fuzzed), or if it has gone through deterministic
-		   testing in earlier, resumed runs (passed_det). */
-
-		if (skip_deterministic || queue_cur->was_fuzzed || queue_cur->passed_det)
-			goto havoc_stage;
-
-		/* Skip deterministic fuzzing if exec path checksum puts this out of scope
-		   for this master instance. */
-
-		if (master_max && (queue_cur->exec_cksum % master_max) != master_id - 1)
-			goto havoc_stage;
-
-
-		cur_ms_lv = get_cur_time();
-		if (!(key_puppet == 0 && ((cur_ms_lv - last_path_time < limit_time_puppet) ||
-			(last_crash_time != 0 && cur_ms_lv - last_crash_time < limit_time_puppet) || last_path_time == 0)))
-		{
-			key_puppet = 1;
-			goto pacemaker_fuzzing;
-		}
-
-		doing_det = 1;
-
-		/*********************************************
-		 * SIMPLE BITFLIP (+dictionary construction) *
-		 *********************************************/
-
-#define FLIP_BIT(_ar, _b) do { \
-    u8* _arf = (u8*)(_ar); \
-    u32 _bf = (_b); \
-    _arf[(_bf) >> 3] ^= (128 >> ((_bf) & 7)); \
-  } while (0)
-
-		 /* Single walking bit. */
-
-		stage_short = "flip1";
-		stage_max = len << 3;
-		stage_name = "bitflip 1/1";
-
-		stage_val_type = STAGE_VAL_NONE;
-
-		orig_hit_cnt = queued_paths + unique_crashes;
-
-		prev_cksum = queue_cur->exec_cksum;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur >> 3;
-
-			FLIP_BIT(out_buf, stage_cur);
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			FLIP_BIT(out_buf, stage_cur);
-
-			/* While flipping the least significant bit in every byte, pull of an extra
-			   trick to detect possible syntax tokens. In essence, the idea is that if
-			   you have a binary blob like this:
-
-			   xxxxxxxxIHDRxxxxxxxx
-
-			   ...and changing the leading and trailing bytes causes variable or no
-			   changes in program flow, but touching any character in the "IHDR" string
-			   always produces the same, distinctive path, it's highly likely that
-			   "IHDR" is an atomically-checked magic value of special significance to
-			   the fuzzed format.
-
-			   We do this here, rather than as a separate stage, because it's a nice
-			   way to keep the operation approximately "free" (i.e., no extra execs).
-
-			   Empirically, performing the check when flipping the least significant bit
-			   is advantageous, compared to doing it at the time of more disruptive
-			   changes, where the program flow may be affected in more violent ways.
-
-			   The caveat is that we won't generate dictionaries in the -d mode or -S
-			   mode - but that's probably a fair trade-off.
-
-			   This won't work particularly well with paths that exhibit variable
-			   behavior, but fails gracefully, so we'll carry out the checks anyway.
-
-			  */
-
-			if (!dumb_mode && (stage_cur & 7) == 7) {
-
-				u32 cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-
-				if (stage_cur == stage_max - 1 && cksum == prev_cksum) {
-
-					/* If at end of file and we are still collecting a string, grab the
-					   final character and force output. */
-
-					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
-					++a_len;
-
-					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
-						maybe_add_auto(a_collect, a_len);
-
-				}
-				else if (cksum != prev_cksum) {
-
-					/* Otherwise, if the checksum has changed, see if we have something
-					   worthwhile queued up, and collect that if the answer is yes. */
-
-					if (a_len >= MIN_AUTO_EXTRA && a_len <= MAX_AUTO_EXTRA)
-						maybe_add_auto(a_collect, a_len);
-
-					a_len = 0;
-					prev_cksum = cksum;
-
-				}
-
-				/* Continue collecting string, but only if the bit flip actually made
-				   any difference - we don't want no-op tokens. */
-
-				if (cksum != queue_cur->exec_cksum) {
-
-					if (a_len < MAX_AUTO_EXTRA) a_collect[a_len] = out_buf[stage_cur >> 3];
-					++a_len;
-
-				}
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP1] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP1] += stage_max;
-
-
-
-		/* Two walking bits. */
-
-		stage_name = "bitflip 2/1";
-		stage_short = "flip2";
-		stage_max = (len << 3) - 1;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur >> 3;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP2] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP2] += stage_max;
-
-
-		/* Four walking bits. */
-
-		stage_name = "bitflip 4/1";
-		stage_short = "flip4";
-		stage_max = (len << 3) - 3;
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur >> 3;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-			FLIP_BIT(out_buf, stage_cur + 2);
-			FLIP_BIT(out_buf, stage_cur + 3);
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			FLIP_BIT(out_buf, stage_cur);
-			FLIP_BIT(out_buf, stage_cur + 1);
-			FLIP_BIT(out_buf, stage_cur + 2);
-			FLIP_BIT(out_buf, stage_cur + 3);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP4] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP4] += stage_max;
-
-
-		/* Effector map setup. These macros calculate:
-
-		   EFF_APOS      - position of a particular file offset in the map.
-		   EFF_ALEN      - length of a map with a particular number of bytes.
-		   EFF_SPAN_ALEN - map span for a sequence of bytes.
-
-		 */
-
-#define EFF_APOS(_p)          ((_p) >> EFF_MAP_SCALE2)
-#define EFF_REM(_x)           ((_x) & ((1 << EFF_MAP_SCALE2) - 1))
-#define EFF_ALEN(_l)          (EFF_APOS(_l) + !!EFF_REM(_l))
-#define EFF_SPAN_ALEN(_p, _l) (EFF_APOS((_p) + (_l) - 1) - EFF_APOS(_p) + 1)
-
-		 /* Initialize effector map for the next step (see comments below). Always
-			flag first and last byte as doing something. */
-
-		eff_map = ck_alloc(EFF_ALEN(len));
-		eff_map[0] = 1;
-
-		if (EFF_APOS(len - 1) != 0) {
-			eff_map[EFF_APOS(len - 1)] = 1;
-			++eff_cnt;
-		}
-
-		/* Walking byte. */
-
-		stage_name = "bitflip 8/8";
-		stage_short = "flip8";
-		stage_max = len;
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-			stage_cur_byte = stage_cur;
-
-			out_buf[stage_cur] ^= 0xFF;
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-			/* We also use this stage to pull off a simple trick: we identify
-			   bytes that seem to have no effect on the current execution path
-			   even when fully flipped - and we skip them during more expensive
-			   deterministic stages, such as arithmetics or known ints. */
-
-			if (!eff_map[EFF_APOS(stage_cur)]) {
-
-				u32 cksum;
-
-				/* If in dumb mode or if the file is very short, just flag everything
-				   without wasting time on checksums. */
-
-				if (!dumb_mode && len >= EFF_MIN_LEN)
-					cksum = hash32(trace_bits, MAP_SIZE, HASH_CONST);
-				else
-					cksum = ~queue_cur->exec_cksum;
-
-				if (cksum != queue_cur->exec_cksum) {
-					eff_map[EFF_APOS(stage_cur)] = 1;
-					++eff_cnt;
-				}
-
-			}
-
-			out_buf[stage_cur] ^= 0xFF;
-
-		}
-
-		/* If the effector map is more than EFF_MAX_PERC dense, just flag the
-		   whole thing as worth fuzzing, since we wouldn't be saving much time
-		   anyway. */
-
-		if (eff_cnt != EFF_ALEN(len) &&
-			eff_cnt * 100 / EFF_ALEN(len) > EFF_MAX_PERC) {
-
-			memset(eff_map, 1, EFF_ALEN(len));
-
-			blocks_eff_select += EFF_ALEN(len);
-
-		}
-		else {
-
-			blocks_eff_select += eff_cnt;
-
-		}
-
-		blocks_eff_total += EFF_ALEN(len);
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP8] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP8] += stage_max;
-
-
-
-		/* Two walking bytes. */
-
-		if (len < 2) goto skip_bitflip;
-
-		stage_name = "bitflip 16/8";
-		stage_short = "flip16";
-		stage_cur = 0;
-		stage_max = len - 1;
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 1; ++i) {
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-				--stage_max;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			*(u16*)(out_buf + i) ^= 0xFFFF;
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-			++stage_cur;
-
-			*(u16*)(out_buf + i) ^= 0xFFFF;
-
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP16] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP16] += stage_max;
-
-
-
-		if (len < 4) goto skip_bitflip;
-
-		/* Four walking bytes. */
-
-		stage_name = "bitflip 32/8";
-		stage_short = "flip32";
-		stage_cur = 0;
-		stage_max = len - 3;
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 3; ++i) {
-
-			/* Let's consult the effector map... */
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-				--stage_max;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
-
-			if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-			++stage_cur;
-
-			*(u32*)(out_buf + i) ^= 0xFFFFFFFF;
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_FLIP32] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_FLIP32] += stage_max;
-
-
-
-
-	skip_bitflip:
-
-		if (no_arith) goto skip_arith;
-
-		/**********************
-		 * ARITHMETIC INC/DEC *
-		 **********************/
-
-		 /* 8-bit arithmetics. */
-
-		stage_name = "arith 8/8";
-		stage_short = "arith8";
-		stage_cur = 0;
-		stage_max = 2 * len * ARITH_MAX;
-
-
-		stage_val_type = STAGE_VAL_LE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len; ++i) {
-
-			u8 orig = out_buf[i];
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)]) {
-				stage_max -= 2 * ARITH_MAX;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 1; j <= ARITH_MAX; ++j) {
-
-				u8 r = orig ^ (orig + j);
-
-				/* Do arithmetic operations only if the result couldn't be a product
-				   of a bitflip. */
-
-				if (!could_be_bitflip(r)) {
-
-					stage_cur_val = j;
-					out_buf[i] = orig + j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				r = orig ^ (orig - j);
-
-				if (!could_be_bitflip(r)) {
-
-					stage_cur_val = -j;
-					out_buf[i] = orig - j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				out_buf[i] = orig;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_ARITH8] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_ARITH8] += stage_max;
-
-
-
-
-		/* 16-bit arithmetics, both endians. */
-
-		if (len < 2) goto skip_arith;
-
-		stage_name = "arith 16/8";
-		stage_short = "arith16";
-		stage_cur = 0;
-		stage_max = 4 * (len - 1) * ARITH_MAX;
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 1; ++i) {
-
-			u16 orig = *(u16*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-				stage_max -= 4 * ARITH_MAX;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 1; j <= ARITH_MAX; ++j) {
-
-				u16 r1 = orig ^ (orig + j),
-					r2 = orig ^ (orig - j),
-					r3 = orig ^ SWAP16(SWAP16(orig) + j),
-					r4 = orig ^ SWAP16(SWAP16(orig) - j);
-
-				/* Try little endian addition and subtraction first. Do it only
-				   if the operation would affect more than one byte (hence the
-				   & 0xff overflow checks) and if it couldn't be a product of
-				   a bitflip. */
-
-				stage_val_type = STAGE_VAL_LE;
-
-				if ((orig & 0xff) + j > 0xff && !could_be_bitflip(r1)) {
-
-					stage_cur_val = j;
-					*(u16*)(out_buf + i) = orig + j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((orig & 0xff) < j && !could_be_bitflip(r2)) {
-
-					stage_cur_val = -j;
-					*(u16*)(out_buf + i) = orig - j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				/* Big endian comes next. Same deal. */
-
-				stage_val_type = STAGE_VAL_BE;
-
-
-				if ((orig >> 8) + j > 0xff && !could_be_bitflip(r3)) {
-
-					stage_cur_val = j;
-					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) + j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((orig >> 8) < j && !could_be_bitflip(r4)) {
-
-					stage_cur_val = -j;
-					*(u16*)(out_buf + i) = SWAP16(SWAP16(orig) - j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				*(u16*)(out_buf + i) = orig;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_ARITH16] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_ARITH16] += stage_max;
-
-
-
-		/* 32-bit arithmetics, both endians. */
-
-		if (len < 4) goto skip_arith;
-
-		stage_name = "arith 32/8";
-		stage_short = "arith32";
-		stage_cur = 0;
-		stage_max = 4 * (len - 3) * ARITH_MAX;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 3; ++i) {
-
-			u32 orig = *(u32*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-				stage_max -= 4 * ARITH_MAX;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 1; j <= ARITH_MAX; ++j) {
-
-				u32 r1 = orig ^ (orig + j),
-					r2 = orig ^ (orig - j),
-					r3 = orig ^ SWAP32(SWAP32(orig) + j),
-					r4 = orig ^ SWAP32(SWAP32(orig) - j);
-
-				/* Little endian first. Same deal as with 16-bit: we only want to
-				   try if the operation would have effect on more than two bytes. */
-
-				stage_val_type = STAGE_VAL_LE;
-
-				if ((orig & 0xffff) + j > 0xffff && !could_be_bitflip(r1)) {
-
-					stage_cur_val = j;
-					*(u32*)(out_buf + i) = orig + j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((orig & 0xffff) < j && !could_be_bitflip(r2)) {
-
-					stage_cur_val = -j;
-					*(u32*)(out_buf + i) = orig - j;
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				/* Big endian next. */
-
-				stage_val_type = STAGE_VAL_BE;
-
-				if ((SWAP32(orig) & 0xffff) + j > 0xffff && !could_be_bitflip(r3)) {
-
-					stage_cur_val = j;
-					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) + j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((SWAP32(orig) & 0xffff) < j && !could_be_bitflip(r4)) {
-
-					stage_cur_val = -j;
-					*(u32*)(out_buf + i) = SWAP32(SWAP32(orig) - j);
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				*(u32*)(out_buf + i) = orig;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_ARITH32] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_ARITH32] += stage_max;
-
-
-
-	skip_arith:
-
-		/**********************
-		 * INTERESTING VALUES *
-		 **********************/
-
-		stage_name = "interest 8/8";
-		stage_short = "int8";
-		stage_cur = 0;
-		stage_max = len * sizeof(interesting_8);
-
-
-
-		stage_val_type = STAGE_VAL_LE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		/* Setting 8-bit integers. */
-
-		for (i = 0; i < len; ++i) {
-
-			u8 orig = out_buf[i];
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)]) {
-				stage_max -= sizeof(interesting_8);
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < sizeof(interesting_8); ++j) {
-
-				/* Skip if the value could be a product of bitflips or arithmetics. */
-
-				if (could_be_bitflip(orig ^ (u8)interesting_8[j]) ||
-					could_be_arith(orig, (u8)interesting_8[j], 1)) {
-					--stage_max;
-					continue;
-				}
-
-				stage_cur_val = interesting_8[j];
-				out_buf[i] = interesting_8[j];
-
-				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-				out_buf[i] = orig;
-				++stage_cur;
-
-			}
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_INTEREST8] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_INTEREST8] += stage_max;
-
-
-
-		/* Setting 16-bit integers, both endians. */
-
-		if (no_arith || len < 2) goto skip_interest;
-
-		stage_name = "interest 16/8";
-		stage_short = "int16";
-		stage_cur = 0;
-		stage_max = 2 * (len - 1) * (sizeof(interesting_16) >> 1);
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 1; ++i) {
-
-			u16 orig = *(u16*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)]) {
-				stage_max -= sizeof(interesting_16);
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < sizeof(interesting_16) / 2; ++j) {
-
-				stage_cur_val = interesting_16[j];
-
-				/* Skip if this could be a product of a bitflip, arithmetics,
-				   or single-byte interesting value insertion. */
-
-				if (!could_be_bitflip(orig ^ (u16)interesting_16[j]) &&
-					!could_be_arith(orig, (u16)interesting_16[j], 2) &&
-					!could_be_interest(orig, (u16)interesting_16[j], 2, 0)) {
-
-					stage_val_type = STAGE_VAL_LE;
-
-					*(u16*)(out_buf + i) = interesting_16[j];
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((u16)interesting_16[j] != SWAP16(interesting_16[j]) &&
-					!could_be_bitflip(orig ^ SWAP16(interesting_16[j])) &&
-					!could_be_arith(orig, SWAP16(interesting_16[j]), 2) &&
-					!could_be_interest(orig, SWAP16(interesting_16[j]), 2, 1)) {
-
-					stage_val_type = STAGE_VAL_BE;
-
-					*(u16*)(out_buf + i) = SWAP16(interesting_16[j]);
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-			}
-
-			*(u16*)(out_buf + i) = orig;
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_INTEREST16] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_INTEREST16] += stage_max;
-
-
-
-
-		if (len < 4) goto skip_interest;
-
-		/* Setting 32-bit integers, both endians. */
-
-		stage_name = "interest 32/8";
-		stage_short = "int32";
-		stage_cur = 0;
-		stage_max = 2 * (len - 3) * (sizeof(interesting_32) >> 2);
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len - 3; ++i) {
-
-			u32 orig = *(u32*)(out_buf + i);
-
-			/* Let's consult the effector map... */
-
-			if (!eff_map[EFF_APOS(i)] && !eff_map[EFF_APOS(i + 1)] &&
-				!eff_map[EFF_APOS(i + 2)] && !eff_map[EFF_APOS(i + 3)]) {
-				stage_max -= sizeof(interesting_32) >> 1;
-				continue;
-			}
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < sizeof(interesting_32) / 4; ++j) {
-
-				stage_cur_val = interesting_32[j];
-
-				/* Skip if this could be a product of a bitflip, arithmetics,
-				   or word interesting value insertion. */
-
-				if (!could_be_bitflip(orig ^ (u32)interesting_32[j]) &&
-					!could_be_arith(orig, interesting_32[j], 4) &&
-					!could_be_interest(orig, interesting_32[j], 4, 0)) {
-
-					stage_val_type = STAGE_VAL_LE;
-
-					*(u32*)(out_buf + i) = interesting_32[j];
-
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-				if ((u32)interesting_32[j] != SWAP32(interesting_32[j]) &&
-					!could_be_bitflip(orig ^ SWAP32(interesting_32[j])) &&
-					!could_be_arith(orig, SWAP32(interesting_32[j]), 4) &&
-					!could_be_interest(orig, SWAP32(interesting_32[j]), 4, 1)) {
-
-					stage_val_type = STAGE_VAL_BE;
-
-					*(u32*)(out_buf + i) = SWAP32(interesting_32[j]);
-					if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-					++stage_cur;
-
-				} else --stage_max;
-
-			}
-
-			*(u32*)(out_buf + i) = orig;
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_INTEREST32] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_INTEREST32] += stage_max;
-
-
-
-	skip_interest:
-
-		/********************
-		 * DICTIONARY STUFF *
-		 ********************/
-
-		if (!extras_cnt) goto skip_user_extras;
-
-		/* Overwrite with user-supplied extras. */
-
-		stage_name = "user extras (over)";
-		stage_short = "ext_UO";
-		stage_cur = 0;
-		stage_max = extras_cnt * len;
-
-
-		stage_val_type = STAGE_VAL_NONE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len; ++i) {
-
-			u32 last_len = 0;
-
-			stage_cur_byte = i;
-
-			/* Extras are sorted by size, from smallest to largest. This means
-			   that we don't have to worry about restoring the buffer in
-			   between writes at a particular offset determined by the outer
-			   loop. */
-
-			for (j = 0; j < extras_cnt; ++j) {
-
-				/* Skip extras probabilistically if extras_cnt > MAX_DET_EXTRAS. Also
-				   skip them if there's no room to insert the payload, if the token
-				   is redundant, or if its entire span has no bytes set in the effector
-				   map. */
-
-				if ((extras_cnt > MAX_DET_EXTRAS && UR(extras_cnt) >= MAX_DET_EXTRAS) ||
-					extras[j].len > len - i ||
-					!memcmp(extras[j].data, out_buf + i, extras[j].len) ||
-					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, extras[j].len))) {
-
-					--stage_max;
-					continue;
-
-				}
-
-				last_len = extras[j].len;
-				memcpy(out_buf + i, extras[j].data, last_len);
-
-				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-				++stage_cur;
-
-			}
-
-			/* Restore all the clobbered memory. */
-			memcpy(out_buf + i, in_buf + i, last_len);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_EXTRAS_UO] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_EXTRAS_UO] += stage_max;
-
-		/* Insertion of user-supplied extras. */
-
-		stage_name = "user extras (insert)";
-		stage_short = "ext_UI";
-		stage_cur = 0;
-		stage_max = extras_cnt * len;
-
-
-
-
-		orig_hit_cnt = new_hit_cnt;
-
-		ex_tmp = ck_alloc(len + MAX_DICT_FILE);
-
-		for (i = 0; i <= len; ++i) {
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < extras_cnt; ++j) {
-
-				if (len + extras[j].len > MAX_FILE) {
-					--stage_max;
-					continue;
-				}
-
-				/* Insert token */
-				memcpy(ex_tmp + i, extras[j].data, extras[j].len);
-
-				/* Copy tail */
-				memcpy(ex_tmp + i + extras[j].len, out_buf + i, len - i);
-
-				if (common_fuzz_stuff(argv, ex_tmp, len + extras[j].len)) {
-					ck_free(ex_tmp);
-					goto abandon_entry;
-				}
-
-				++stage_cur;
-
-			}
-
-			/* Copy head */
-			ex_tmp[i] = out_buf[i];
-
-		}
-
-		ck_free(ex_tmp);
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_EXTRAS_UI] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_EXTRAS_UI] += stage_max;
-
-	skip_user_extras:
-
-		if (!a_extras_cnt) goto skip_extras;
-
-		stage_name = "auto extras (over)";
-		stage_short = "ext_AO";
-		stage_cur = 0;
-		stage_max = MIN(a_extras_cnt, USE_AUTO_EXTRAS) * len;
-
-
-		stage_val_type = STAGE_VAL_NONE;
-
-		orig_hit_cnt = new_hit_cnt;
-
-		for (i = 0; i < len; ++i) {
-
-			u32 last_len = 0;
-
-			stage_cur_byte = i;
-
-			for (j = 0; j < MIN(a_extras_cnt, USE_AUTO_EXTRAS); ++j) {
-
-				/* See the comment in the earlier code; extras are sorted by size. */
-
-				if (a_extras[j].len > len - i ||
-					!memcmp(a_extras[j].data, out_buf + i, a_extras[j].len) ||
-					!memchr(eff_map + EFF_APOS(i), 1, EFF_SPAN_ALEN(i, a_extras[j].len))) {
-
-					--stage_max;
-					continue;
-
-				}
-
-				last_len = a_extras[j].len;
-				memcpy(out_buf + i, a_extras[j].data, last_len);
-
-				if (common_fuzz_stuff(argv, out_buf, len)) goto abandon_entry;
-
-				++stage_cur;
-
-			}
-
-			/* Restore all the clobbered memory. */
-			memcpy(out_buf + i, in_buf + i, last_len);
-
-		}
-
-		new_hit_cnt = queued_paths + unique_crashes;
-
-		stage_finds[STAGE_EXTRAS_AO] += new_hit_cnt - orig_hit_cnt;
-		stage_cycles[STAGE_EXTRAS_AO] += stage_max;
-
-	skip_extras:
-
-		/* If we made this to here without jumping to havoc_stage or abandon_entry,
-		   we're properly done with deterministic steps and can mark it as such
-		   in the .state/ directory. */
-
-		if (!queue_cur->passed_det) mark_as_det_done(queue_cur);
-
-		/****************
-		 * RANDOM HAVOC *
-		 ****************/
-
-	havoc_stage:
-	pacemaker_fuzzing:
-
-
-		stage_cur_byte = -1;
-
-		/* The havoc stage mutation code is also invoked when splicing files; if the
-		   splice_cycle variable is set, generate different descriptions and such. */
-
-		if (!splice_cycle) {
-
-			stage_name = "MOpt-havoc";
-			stage_short = "MOpt_havoc";
-			stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
-				perf_score / havoc_div / 100;
-
-		} else {
-
-			static u8 tmp[32];
-
-			perf_score = orig_perf;
-
-			sprintf(tmp, "MOpt-core-splice %u", splice_cycle);
-			stage_name = tmp;
-			stage_short = "MOpt_core_splice";
-			stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
-
-		}
-
-		s32 temp_len_puppet;
-		cur_ms_lv = get_cur_time();
-
-		//for (; swarm_now < swarm_num; ++swarm_now)
-		{
-			if (key_puppet == 1) {
-				if (unlikely(orig_hit_cnt_puppet == 0)) {
-					orig_hit_cnt_puppet = queued_paths + unique_crashes;
-					last_limit_time_start = get_cur_time();
-					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
-				}
-			}
-			{
-#ifndef IGNORE_FINDS
-			havoc_stage_puppet:
-#endif
-
-				stage_cur_byte = -1;
-
-				/* The havoc stage mutation code is also invoked when splicing files; if the
-				   splice_cycle variable is set, generate different descriptions and such. */
-
-				if (!splice_cycle) {
-					stage_name = "MOpt core avoc";
-					stage_short = "MOpt_core_havoc";
-					stage_max = (doing_det ? HAVOC_CYCLES_INIT : HAVOC_CYCLES) *
-						perf_score / havoc_div / 100;
-				} else {
-					static u8 tmp[32];
-					perf_score = orig_perf;
-					sprintf(tmp, "MOpt core splice %u", splice_cycle);
-					stage_name = tmp;
-					stage_short = "MOpt_core_splice";
-					stage_max = SPLICE_HAVOC * perf_score / havoc_div / 100;
-				}
-
-				if (stage_max < HAVOC_MIN) stage_max = HAVOC_MIN;
-				temp_len = len;
-				orig_hit_cnt = queued_paths + unique_crashes;
-				havoc_queued = queued_paths;
-
-				for (stage_cur = 0; stage_cur < stage_max; ++stage_cur) {
-
-					u32 use_stacking = 1 << (1 + UR(HAVOC_STACK_POW2));
-					stage_cur_val = use_stacking;
-
-					for (i = 0; i < operator_num; ++i) {
-						core_operator_cycles_puppet_v3[i] = core_operator_cycles_puppet_v2[i];
-					}
-
-					for (i = 0; i < use_stacking; ++i) {
-
-						switch (select_algorithm()) {
-
-						case 0:
-							/* Flip a single bit somewhere. Spooky! */
-							FLIP_BIT(out_buf, UR(temp_len << 3));
-							core_operator_cycles_puppet_v2[STAGE_FLIP1] += 1;
-							break;
-
-
-						case 1:
-							if (temp_len < 2) break;
-							temp_len_puppet = UR(temp_len << 3);
-							FLIP_BIT(out_buf, temp_len_puppet);
-							FLIP_BIT(out_buf, temp_len_puppet + 1);
-							core_operator_cycles_puppet_v2[STAGE_FLIP2] += 1;
-							break;
-
-						case 2:
-							if (temp_len < 2) break;
-							temp_len_puppet = UR(temp_len << 3);
-							FLIP_BIT(out_buf, temp_len_puppet);
-							FLIP_BIT(out_buf, temp_len_puppet + 1);
-							FLIP_BIT(out_buf, temp_len_puppet + 2);
-							FLIP_BIT(out_buf, temp_len_puppet + 3);
-							core_operator_cycles_puppet_v2[STAGE_FLIP4] += 1;
-							break;
-
-						case 3:
-							if (temp_len < 4) break;
-							out_buf[UR(temp_len)] ^= 0xFF;
-							core_operator_cycles_puppet_v2[STAGE_FLIP8] += 1;
-							break;
-
-						case 4:
-							if (temp_len < 8) break;
-							*(u16*)(out_buf + UR(temp_len - 1)) ^= 0xFFFF;
-							core_operator_cycles_puppet_v2[STAGE_FLIP16] += 1;
-							break;
-
-						case 5:
-							if (temp_len < 8) break;
-							*(u32*)(out_buf + UR(temp_len - 3)) ^= 0xFFFFFFFF;
-							core_operator_cycles_puppet_v2[STAGE_FLIP32] += 1;
-							break;
-
-						case 6:
-							out_buf[UR(temp_len)] -= 1 + UR(ARITH_MAX);
-							out_buf[UR(temp_len)] += 1 + UR(ARITH_MAX);
-							core_operator_cycles_puppet_v2[STAGE_ARITH8] += 1;
-							break;
-
-						case 7:
-							/* Randomly subtract from word, random endian. */
-							if (temp_len < 8) break;
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 1);
-								*(u16*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
-							} else {
-								u32 pos = UR(temp_len - 1);
-								u16 num = 1 + UR(ARITH_MAX);
-								*(u16*)(out_buf + pos) =
-									SWAP16(SWAP16(*(u16*)(out_buf + pos)) - num);
-							}
-							/* Randomly add to word, random endian. */
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 1);
-								*(u16*)(out_buf + pos) += 1 + UR(ARITH_MAX);
-							} else {
-								u32 pos = UR(temp_len - 1);
-								u16 num = 1 + UR(ARITH_MAX);
-								*(u16*)(out_buf + pos) =
-									SWAP16(SWAP16(*(u16*)(out_buf + pos)) + num);
-							}
-							core_operator_cycles_puppet_v2[STAGE_ARITH16] += 1;
-							break;
-
-
-						case 8:
-							/* Randomly subtract from dword, random endian. */
-							if (temp_len < 8) break;
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 3);
-								*(u32*)(out_buf + pos) -= 1 + UR(ARITH_MAX);
-							} else {
-								u32 pos = UR(temp_len - 3);
-								u32 num = 1 + UR(ARITH_MAX);
-								*(u32*)(out_buf + pos) =
-									SWAP32(SWAP32(*(u32*)(out_buf + pos)) - num);
-							}
-							/* Randomly add to dword, random endian. */
-							if (UR(2)) {
-								u32 pos = UR(temp_len - 3);
-								*(u32*)(out_buf + pos) += 1 + UR(ARITH_MAX);
-							} else {
-								u32 pos = UR(temp_len - 3);
-								u32 num = 1 + UR(ARITH_MAX);
-								*(u32*)(out_buf + pos) =
-									SWAP32(SWAP32(*(u32*)(out_buf + pos)) + num);
-							}
-							core_operator_cycles_puppet_v2[STAGE_ARITH32] += 1;
-							break;
-
-
-						case 9:
-							/* Set byte to interesting value. */
-							if (temp_len < 4) break;
-							out_buf[UR(temp_len)] = interesting_8[UR(sizeof(interesting_8))];
-							core_operator_cycles_puppet_v2[STAGE_INTEREST8] += 1;
-							break;
-
-						case 10:
-							/* Set word to interesting value, randomly choosing endian. */
-							if (temp_len < 8) break;
-							if (UR(2)) {
-								*(u16*)(out_buf + UR(temp_len - 1)) =
-									interesting_16[UR(sizeof(interesting_16) >> 1)];
-							} else {
-								*(u16*)(out_buf + UR(temp_len - 1)) = SWAP16(
-									interesting_16[UR(sizeof(interesting_16) >> 1)]);
-							}
-							core_operator_cycles_puppet_v2[STAGE_INTEREST16] += 1;
-							break;
-
-
-						case 11:
-							/* Set dword to interesting value, randomly choosing endian. */
-
-							if (temp_len < 8) break;
-
-							if (UR(2)) {
-								*(u32*)(out_buf + UR(temp_len - 3)) =
-									interesting_32[UR(sizeof(interesting_32) >> 2)];
-							} else {
-								*(u32*)(out_buf + UR(temp_len - 3)) = SWAP32(
-									interesting_32[UR(sizeof(interesting_32) >> 2)]);
-							}
-							core_operator_cycles_puppet_v2[STAGE_INTEREST32] += 1;
-							break;
-
-
-						case 12:
-
-							/* Just set a random byte to a random value. Because,
-							   why not. We use XOR with 1-255 to eliminate the
-							   possibility of a no-op. */
-
-							out_buf[UR(temp_len)] ^= 1 + UR(255);
-							core_operator_cycles_puppet_v2[STAGE_RANDOMBYTE] += 1;
-							break;
-
-
-						case 13: {
-
-							/* Delete bytes. We're making this a bit more likely
-							   than insertion (the next option) in hopes of keeping
-							   files reasonably small. */
-
-							u32 del_from, del_len;
-
-							if (temp_len < 2) break;
-
-							/* Don't delete too much. */
-
-							del_len = choose_block_len(temp_len - 1);
-
-							del_from = UR(temp_len - del_len + 1);
-
-							memmove(out_buf + del_from, out_buf + del_from + del_len,
-								temp_len - del_from - del_len);
-
-							temp_len -= del_len;
-							core_operator_cycles_puppet_v2[STAGE_DELETEBYTE] += 1;
-							break;
-
-						}
-
-						case 14:
-
-							if (temp_len + HAVOC_BLK_XL < MAX_FILE) {
-
-								/* Clone bytes (75%) or insert a block of constant bytes (25%). */
-
-								u8  actually_clone = UR(4);
-								u32 clone_from, clone_to, clone_len;
-								u8* new_buf;
-
-								if (actually_clone) {
-
-									clone_len = choose_block_len(temp_len);
-									clone_from = UR(temp_len - clone_len + 1);
-
-								} else {
-
-									clone_len = choose_block_len(HAVOC_BLK_XL);
-									clone_from = 0;
-
-								}
-
-								clone_to = UR(temp_len);
-
-								new_buf = ck_alloc_nozero(temp_len + clone_len);
-
-								/* Head */
-
-								memcpy(new_buf, out_buf, clone_to);
-
-								/* Inserted part */
-
-								if (actually_clone)
-									memcpy(new_buf + clone_to, out_buf + clone_from, clone_len);
-								else
-									memset(new_buf + clone_to,
-										UR(2) ? UR(256) : out_buf[UR(temp_len)], clone_len);
-
-								/* Tail */
-								memcpy(new_buf + clone_to + clone_len, out_buf + clone_to,
-									temp_len - clone_to);
-
-								ck_free(out_buf);
-								out_buf = new_buf;
-								temp_len += clone_len;
-								core_operator_cycles_puppet_v2[STAGE_Clone75] += 1;
-							}
-
-							break;
-
-						case 15: {
-
-							/* Overwrite bytes with a randomly selected chunk (75%) or fixed
-							   bytes (25%). */
-
-							u32 copy_from, copy_to, copy_len;
-
-							if (temp_len < 2) break;
-
-							copy_len = choose_block_len(temp_len - 1);
-
-							copy_from = UR(temp_len - copy_len + 1);
-							copy_to = UR(temp_len - copy_len + 1);
-
-							if (UR(4)) {
-
-								if (copy_from != copy_to)
-									memmove(out_buf + copy_to, out_buf + copy_from, copy_len);
-
-							}
-							else memset(out_buf + copy_to,
-								UR(2) ? UR(256) : out_buf[UR(temp_len)], copy_len);
-							core_operator_cycles_puppet_v2[STAGE_OverWrite75] += 1;
-							break;
-
-						}
-
-
-						}
-
-					}
-
-					tmp_core_time += 1;
-
-					u64 temp_total_found = queued_paths + unique_crashes;
-
-					if (common_fuzz_stuff(argv, out_buf, temp_len))
-						goto abandon_entry_puppet;
-
-					/* out_buf might have been mangled a bit, so let's restore it to its
-					   original size and shape. */
-
-					if (temp_len < len) out_buf = ck_realloc(out_buf, len);
-					temp_len = len;
-					memcpy(out_buf, in_buf, len);
-
-					/* If we're finding new stuff, let's run for a bit longer, limits
-					   permitting. */
-
-					if (queued_paths != havoc_queued) {
-
-						if (perf_score <= havoc_max_mult * 100) {
-							stage_max *= 2;
-							perf_score *= 2;
-						}
-
-						havoc_queued = queued_paths;
-
-					}
-
-					if (unlikely(queued_paths + unique_crashes > temp_total_found))
-					{
-						u64 temp_temp_puppet = queued_paths + unique_crashes - temp_total_found;
-						total_puppet_find = total_puppet_find + temp_temp_puppet;
-						for (i = 0; i < 16; ++i)
-						{
-							if (core_operator_cycles_puppet_v2[i] > core_operator_cycles_puppet_v3[i])
-								core_operator_finds_puppet_v2[i] += temp_temp_puppet;
-						}
-					}
-
-				}
-
-				new_hit_cnt = queued_paths + unique_crashes;
-
-
-#ifndef IGNORE_FINDS
-
-				/************
-				 * SPLICING *
-				 ************/
-
-
-			retry_splicing_puppet:
-
-
-
-				if (use_splicing && splice_cycle++ < SPLICE_CYCLES_puppet &&
-					queued_paths > 1 && queue_cur->len > 1) {
-
-					struct queue_entry* target;
-					u32 tid, split_at;
-					u8* new_buf;
-					s32 f_diff, l_diff;
-
-					/* First of all, if we've modified in_buf for havoc, let's clean that
-					   up... */
-
-					if (in_buf != orig_in) {
-						ck_free(in_buf);
-						in_buf = orig_in;
-						len = queue_cur->len;
-					}
-
-					/* Pick a random queue entry and seek to it. Don't splice with yourself. */
-
-					do { tid = UR(queued_paths); } while (tid == current_entry);
-
-					splicing_with = tid;
-					target = queue;
-
-					while (tid >= 100) { target = target->next_100; tid -= 100; }
-					while (tid--) target = target->next;
-
-					/* Make sure that the target has a reasonable length. */
-
-					while (target && (target->len < 2 || target == queue_cur)) {
-						target = target->next;
-						++splicing_with;
-					}
-
-					if (!target) goto retry_splicing_puppet;
-
-					/* Read the testcase into a new buffer. */
-
-					fd = open(target->fname, O_RDONLY);
-
-					if (fd < 0) PFATAL("Unable to open '%s'", target->fname);
-
-					new_buf = ck_alloc_nozero(target->len);
-
-					ck_read(fd, new_buf, target->len, target->fname);
-
-					close(fd);
-
-					/* Find a suitable splicin g location, somewhere between the first and
-					   the last differing byte. Bail out if the difference is just a single
-					   byte or so. */
-
-					locate_diffs(in_buf, new_buf, MIN(len, target->len), &f_diff, &l_diff);
-
-					if (f_diff < 0 || l_diff < 2 || f_diff == l_diff) {
-						ck_free(new_buf);
-						goto retry_splicing_puppet;
-					}
-
-					/* Split somewhere between the first and last differing byte. */
-
-					split_at = f_diff + UR(l_diff - f_diff);
-
-					/* Do the thing. */
-
-					len = target->len;
-					memcpy(new_buf, in_buf, split_at);
-					in_buf = new_buf;
-					ck_free(out_buf);
-					out_buf = ck_alloc_nozero(len);
-					memcpy(out_buf, in_buf, len);
-
-					goto havoc_stage_puppet;
-
-				}
-
-#endif /* !IGNORE_FINDS */
-
-				ret_val = 0;
-			abandon_entry:
-			abandon_entry_puppet:
-
-				if (splice_cycle >= SPLICE_CYCLES_puppet)
-					SPLICE_CYCLES_puppet = (UR(SPLICE_CYCLES_puppet_up - SPLICE_CYCLES_puppet_low + 1) + SPLICE_CYCLES_puppet_low);
-
-
-				splicing_with = -1;
-
-
-				munmap(orig_in, queue_cur->len);
-
-				if (in_buf != orig_in) ck_free(in_buf);
-				ck_free(out_buf);
-				ck_free(eff_map);
-
-
-				if (key_puppet == 1)
-				{
-					if (unlikely(queued_paths + unique_crashes > ((queued_paths + unique_crashes)*limit_time_bound + orig_hit_cnt_puppet)))
-					{
-						key_puppet = 0;
-						cur_ms_lv = get_cur_time();
-						new_hit_cnt = queued_paths + unique_crashes;
-						orig_hit_cnt_puppet = 0;
-						last_limit_time_start = 0;
-					}
-				}
-
-
-				if (unlikely(tmp_core_time > period_core))
-				{
-					total_pacemaker_time += tmp_core_time;
-					tmp_core_time = 0;
-					temp_puppet_find = total_puppet_find;
-					new_hit_cnt = queued_paths + unique_crashes;
-
-					u64 temp_stage_finds_puppet = 0;
-					for (i = 0; i < operator_num; ++i)
-					{
-
-						core_operator_finds_puppet[i] = core_operator_finds_puppet_v2[i];
-						core_operator_cycles_puppet[i] = core_operator_cycles_puppet_v2[i];
-						temp_stage_finds_puppet += core_operator_finds_puppet[i];
-					}
-
-					key_module = 2;
-
-					old_hit_count = new_hit_cnt;
-				}
-				return ret_val;
-			}
-		}
-
-
-#undef FLIP_BIT
-
-}
-
-
-void pso_updating(void) {
-
-	g_now += 1;
-	if (g_now > g_max) g_now = 0;
-	w_now = (w_init - w_end)*(g_max - g_now) / (g_max)+w_end;
-	int tmp_swarm, i, j;
-	u64 temp_operator_finds_puppet = 0;
-	for (i = 0; i < operator_num; ++i)
-	{
-		operator_finds_puppet[i] = core_operator_finds_puppet[i];
-
-		for (j = 0; j < swarm_num; ++j)
-		{
-			operator_finds_puppet[i] = operator_finds_puppet[i] + stage_finds_puppet[j][i];
-		}
-		temp_operator_finds_puppet = temp_operator_finds_puppet + operator_finds_puppet[i];
-	}
-
-	for (i = 0; i < operator_num; ++i)
-	{
-		if (operator_finds_puppet[i])
-			G_best[i] = (double)((double)(operator_finds_puppet[i]) / (double)(temp_operator_finds_puppet));
-	}
-
-	for (tmp_swarm = 0; tmp_swarm < swarm_num; ++tmp_swarm)
-	{
-		double x_temp = 0.0;
-		for (i = 0; i < operator_num; ++i)
-		{
-			probability_now[tmp_swarm][i] = 0.0;
-			v_now[tmp_swarm][i] = w_now * v_now[tmp_swarm][i] + RAND_C * (L_best[tmp_swarm][i] - x_now[tmp_swarm][i]) + RAND_C * (G_best[i] - x_now[tmp_swarm][i]);
-			x_now[tmp_swarm][i] += v_now[tmp_swarm][i];
-			if (x_now[tmp_swarm][i] > v_max)
-				x_now[tmp_swarm][i] = v_max;
-			else if (x_now[tmp_swarm][i] < v_min)
-				x_now[tmp_swarm][i] = v_min;
-			x_temp += x_now[tmp_swarm][i];
-		}
-
-		for (i = 0; i < operator_num; ++i)
-		{
-			x_now[tmp_swarm][i] = x_now[tmp_swarm][i] / x_temp;
-			if (likely(i != 0))
-				probability_now[tmp_swarm][i] = probability_now[tmp_swarm][i - 1] + x_now[tmp_swarm][i];
-			else
-				probability_now[tmp_swarm][i] = x_now[tmp_swarm][i];
-		}
-		if (probability_now[tmp_swarm][operator_num - 1] < 0.99 || probability_now[tmp_swarm][operator_num - 1] > 1.01) FATAL("ERROR probability");
-	}
-	swarm_now = 0;
-	key_module = 0;
-}
-
-
-/* larger change for MOpt implementation: the original fuzz_one was renamed
-   to fuzz_one_original. All documentation references to fuzz_one therefore
-   mean fuzz_one_original */
-static u8 fuzz_one(char** argv) {
-	int key_val_lv = 0;
-	if (limit_time_sig == 0) {
-		key_val_lv = fuzz_one_original(argv);
-	} else {
-		if (key_module == 0)
-			key_val_lv = pilot_fuzzing(argv);
-		else if (key_module == 1)
-			key_val_lv = core_fuzzing(argv);
-		else if (key_module == 2)
-			pso_updating();
-	}
-
-	return key_val_lv;
-}
-
-
-/* Grab interesting test cases from other fuzzers. */
-
-static void sync_fuzzers(char** argv) {
-
-  DIR* sd;
-  struct dirent* sd_ent;
-  u32 sync_cnt = 0;
-
-  sd = opendir(sync_dir);
-  if (!sd) PFATAL("Unable to open '%s'", sync_dir);
-
-  stage_max = stage_cur = 0;
-  cur_depth = 0;
-
-  /* Look at the entries created for every other fuzzer in the sync directory. */
-
-  while ((sd_ent = readdir(sd))) {
-
-    static u8 stage_tmp[128];
-
-    DIR* qd;
-    struct dirent* qd_ent;
-    u8 *qd_path, *qd_synced_path;
-    u32 min_accept = 0, next_min_accept;
-
-    s32 id_fd;
-
-    /* Skip dot files and our own output directory. */
-
-    if (sd_ent->d_name[0] == '.' || !strcmp(sync_id, sd_ent->d_name)) continue;
-
-    /* Skip anything that doesn't have a queue/ subdirectory. */
-
-    qd_path = alloc_printf("%s/%s/queue", sync_dir, sd_ent->d_name);
-
-    if (!(qd = opendir(qd_path))) {
-      ck_free(qd_path);
-      continue;
-    }
-
-    /* Retrieve the ID of the last seen test case. */
-
-    qd_synced_path = alloc_printf("%s/.synced/%s", out_dir, sd_ent->d_name);
-
-    id_fd = open(qd_synced_path, O_RDWR | O_CREAT, 0600);
-
-    if (id_fd < 0) PFATAL("Unable to create '%s'", qd_synced_path);
-
-    if (read(id_fd, &min_accept, sizeof(u32)) > 0) 
-      lseek(id_fd, 0, SEEK_SET);
-
-    next_min_accept = min_accept;
-
-    /* Show stats */    
-
-    sprintf(stage_tmp, "sync %u", ++sync_cnt);
-    stage_name = stage_tmp;
-    stage_cur  = 0;
-    stage_max  = 0;
-
-    /* For every file queued by this fuzzer, parse ID and see if we have looked at
-       it before; exec a test case if not. */
-
-    while ((qd_ent = readdir(qd))) {
-
-      u8* path;
-      s32 fd;
-      struct stat st;
-
-      if (qd_ent->d_name[0] == '.' ||
-          sscanf(qd_ent->d_name, CASE_PREFIX "%06u", &syncing_case) != 1 || 
-          syncing_case < min_accept) continue;
-
-      /* OK, sounds like a new one. Let's give it a try. */
-
-      if (syncing_case >= next_min_accept)
-        next_min_accept = syncing_case + 1;
-
-      path = alloc_printf("%s/%s", qd_path, qd_ent->d_name);
-
-      /* Allow this to fail in case the other fuzzer is resuming or so... */
-
-      fd = open(path, O_RDONLY);
-
-      if (fd < 0) {
-         ck_free(path);
-         continue;
-      }
-
-      if (fstat(fd, &st)) PFATAL("fstat() failed");
-
-      /* Ignore zero-sized or oversized files. */
-
-      if (st.st_size && st.st_size <= MAX_FILE) {
-
-        u8  fault;
-        u8* mem = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-
-        if (mem == MAP_FAILED) PFATAL("Unable to mmap '%s'", path);
-
-        /* See what happens. We rely on save_if_interesting() to catch major
-           errors and save the test case. */
-
-        write_to_testcase(mem, st.st_size);
-
-        fault = run_target(argv, exec_tmout);
-
-        if (stop_soon) return;
-
-        syncing_party = sd_ent->d_name;
-        queued_imported += save_if_interesting(argv, mem, st.st_size, fault);
-        syncing_party = 0;
-
-        munmap(mem, st.st_size);
-
-        if (!(stage_cur++ % stats_update_freq)) show_stats();
-
-      }
-
-      ck_free(path);
-      close(fd);
-
-    }
-
-    ck_write(id_fd, &next_min_accept, sizeof(u32), qd_synced_path);
-
-    close(id_fd);
-    closedir(qd);
-    ck_free(qd_path);
-    ck_free(qd_synced_path);
-    
-  }  
-
-  closedir(sd);
-
-}
-
-
-/* Handle stop signal (Ctrl-C, etc). */
-
-static void handle_stop_sig(int sig) {
-
-  stop_soon = 1; 
-
-  if (child_pid > 0) kill(child_pid, SIGKILL);
-  if (forksrv_pid > 0) kill(forksrv_pid, SIGKILL);
-
-}
-
-
-/* Handle skip request (SIGUSR1). */
-
-static void handle_skipreq(int sig) {
-
-  skip_requested = 1;
-
-}
-
-
-/* Do a PATH search and find target binary to see that it exists and
-   isn't a shell script - a common and painful mistake. We also check for
-   a valid ELF header and for evidence of AFL instrumentation. */
-
-void check_binary(u8* fname) {
-
-  u8* env_path = 0;
-  struct stat st;
-
-  s32 fd;
-  u8* f_data;
-  u32 f_len = 0;
-
-  ACTF("Validating target binary...");
-
-  if (strchr(fname, '/') || !(env_path = getenv("PATH"))) {
-
-    target_path = ck_strdup(fname);
-    if (stat(target_path, &st) || !S_ISREG(st.st_mode) ||
-        !(st.st_mode & 0111) || (f_len = st.st_size) < 4)
-      FATAL("Program '%s' not found or not executable", fname);
-
-  } else {
-
-    while (env_path) {
-
-      u8 *cur_elem, *delim = strchr(env_path, ':');
-
-      if (delim) {
-
-        cur_elem = ck_alloc(delim - env_path + 1);
-        memcpy(cur_elem, env_path, delim - env_path);
-        ++delim;
-
-      } else cur_elem = ck_strdup(env_path);
-
-      env_path = delim;
-
-      if (cur_elem[0])
-        target_path = alloc_printf("%s/%s", cur_elem, fname);
-      else
-        target_path = ck_strdup(fname);
-
-      ck_free(cur_elem);
-
-      if (!stat(target_path, &st) && S_ISREG(st.st_mode) &&
-          (st.st_mode & 0111) && (f_len = st.st_size) >= 4) break;
-
-      ck_free(target_path);
-      target_path = 0;
-
-    }
-
-    if (!target_path) FATAL("Program '%s' not found or not executable", fname);
-
-  }
-
-  if (getenv("AFL_SKIP_BIN_CHECK")) return;
-
-  /* Check for blatant user errors. */
-
-  if ((!strncmp(target_path, "/tmp/", 5) && !strchr(target_path + 5, '/')) ||
-      (!strncmp(target_path, "/var/tmp/", 9) && !strchr(target_path + 9, '/')))
-     FATAL("Please don't keep binaries in /tmp or /var/tmp");
-
-  fd = open(target_path, O_RDONLY);
-
-  if (fd < 0) PFATAL("Unable to open '%s'", target_path);
-
-  f_data = mmap(0, f_len, PROT_READ, MAP_PRIVATE, fd, 0);
-
-  if (f_data == MAP_FAILED) PFATAL("Unable to mmap file '%s'", target_path);
-
-  close(fd);
-
-  if (f_data[0] == '#' && f_data[1] == '!') {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "Oops, the target binary looks like a shell script. Some build systems will\n"
-         "    sometimes generate shell stubs for dynamically linked programs; try static\n"
-         "    library mode (./configure --disable-shared) if that's the case.\n\n"
-
-         "    Another possible cause is that you are actually trying to use a shell\n" 
-         "    wrapper around the fuzzed component. Invoking shell can slow down the\n" 
-         "    fuzzing process by a factor of 20x or more; it's best to write the wrapper\n"
-         "    in a compiled language instead.\n");
-
-    FATAL("Program '%s' is a shell script", target_path);
-
-  }
-
-#ifndef __APPLE__
-
-  if (f_data[0] != 0x7f || memcmp(f_data + 1, "ELF", 3))
-    FATAL("Program '%s' is not an ELF binary", target_path);
-
-#else
-
-#if !defined(__arm__) && !defined(__arm64__)
-  if (f_data[0] != 0xCF || f_data[1] != 0xFA || f_data[2] != 0xED)
-    FATAL("Program '%s' is not a 64-bit Mach-O binary", target_path);
-#endif
-
-#endif /* ^!__APPLE__ */
-
-  if (!qemu_mode && !unicorn_mode && !dumb_mode &&
-      !memmem(f_data, f_len, SHM_ENV_VAR, strlen(SHM_ENV_VAR) + 1)) {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "Looks like the target binary is not instrumented! The fuzzer depends on\n"
-         "    compile-time instrumentation to isolate interesting test cases while\n"
-         "    mutating the input data. For more information, and for tips on how to\n"
-         "    instrument binaries, please see %s/README.\n\n"
-
-         "    When source code is not available, you may be able to leverage QEMU\n"
-         "    mode support. Consult the README for tips on how to enable this.\n"
-
-         "    (It is also possible to use afl-fuzz as a traditional, \"dumb\" fuzzer.\n"
-         "    For that, you can use the -n option - but expect much worse results.)\n",
-         doc_path);
-
-    FATAL("No instrumentation detected");
-
-  }
-
-  if ((qemu_mode || unicorn_mode) &&
-      memmem(f_data, f_len, SHM_ENV_VAR, strlen(SHM_ENV_VAR) + 1)) {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "This program appears to be instrumented with afl-gcc, but is being run in\n"
-         "    QEMU or Unicorn mode (-Q or -U). This is probably not what you want -\n"
-         "    this setup will be slow and offer no practical benefits.\n");
-
-    FATAL("Instrumentation found in -Q or -U mode");
-
-  }
-
-  if (memmem(f_data, f_len, "libasan.so", 10) ||
-      memmem(f_data, f_len, "__msan_init", 11)) uses_asan = 1;
-
-  /* Detect persistent & deferred init signatures in the binary. */
-
-  if (memmem(f_data, f_len, PERSIST_SIG, strlen(PERSIST_SIG) + 1)) {
-
-    OKF(cPIN "Persistent mode binary detected.");
-    setenv(PERSIST_ENV_VAR, "1", 1);
-    persistent_mode = 1;
-
-  } else if (getenv("AFL_PERSISTENT")) {
-
-    WARNF("AFL_PERSISTENT is no longer supported and may misbehave!");
-
-  }
-
-  if (memmem(f_data, f_len, DEFER_SIG, strlen(DEFER_SIG) + 1)) {
-
-    OKF(cPIN "Deferred forkserver binary detected.");
-    setenv(DEFER_ENV_VAR, "1", 1);
-    deferred_mode = 1;
-
-  } else if (getenv("AFL_DEFER_FORKSRV")) {
-
-    WARNF("AFL_DEFER_FORKSRV is no longer supported and may misbehave!");
-
-  }
-
-  if (munmap(f_data, f_len)) PFATAL("unmap() failed");
-
-}
-
-
-/* Trim and possibly create a banner for the run. */
-
-static void fix_up_banner(u8* name) {
-
-  if (!use_banner) {
-
-    if (sync_id) {
-
-      use_banner = sync_id;
-
-    } else {
-
-      u8* trim = strrchr(name, '/');
-      if (!trim) use_banner = name; else use_banner = trim + 1;
-
-    }
-
-  }
-
-  if (strlen(use_banner) > 32) {
-
-    u8* tmp = ck_alloc(36);
-    sprintf(tmp, "%.32s...", use_banner);
-    use_banner = tmp;
-
-  }
-
-}
-
-
-/* Check if we're on TTY. */
-
-static void check_if_tty(void) {
-
-  struct winsize ws;
-
-  if (getenv("AFL_NO_UI")) {
-    OKF("Disabling the UI because AFL_NO_UI is set.");
-    not_on_tty = 1;
-    return;
-  }
-
-  if (ioctl(1, TIOCGWINSZ, &ws)) {
-
-    if (errno == ENOTTY) {
-      OKF("Looks like we're not running on a tty, so I'll be a bit less verbose.");
-      not_on_tty = 1;
-    }
-
-    return;
-  }
-
-}
-
-
-/* Check terminal dimensions after resize. */
-
-static void check_term_size(void) {
-
-  struct winsize ws;
-
-  term_too_small = 0;
-
-  if (ioctl(1, TIOCGWINSZ, &ws)) return;
-
-  if (ws.ws_row == 0 || ws.ws_col == 0) return;
-  if (ws.ws_row < 24 || ws.ws_col < 79) term_too_small = 1;
-
-}
-
-
-
 /* Display usage hints. */
 
 static void usage(u8* argv0) {
@@ -9116,622 +80,9 @@ static void usage(u8* argv0) {
 
 }
 
+#ifndef AFL_LIB
 
-/* Prepare output directories and fds. */
-
-void setup_dirs_fds(void) {
-
-  u8* tmp;
-  s32 fd;
-
-  ACTF("Setting up output directories...");
-
-  if (sync_id && mkdir(sync_dir, 0700) && errno != EEXIST)
-      PFATAL("Unable to create '%s'", sync_dir);
-
-  if (mkdir(out_dir, 0700)) {
-
-    if (errno != EEXIST) PFATAL("Unable to create '%s'", out_dir);
-
-    maybe_delete_out_dir();
-
-  } else {
-
-    if (in_place_resume)
-      FATAL("Resume attempted but old output directory not found");
-
-    out_dir_fd = open(out_dir, O_RDONLY);
-
-#ifndef __sun
-
-    if (out_dir_fd < 0 || flock(out_dir_fd, LOCK_EX | LOCK_NB))
-      PFATAL("Unable to flock() output directory.");
-
-#endif /* !__sun */
-
-  }
-
-  /* Queue directory for any starting & discovered paths. */
-
-  tmp = alloc_printf("%s/queue", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* Top-level directory for queue metadata used for session
-     resume and related tasks. */
-
-  tmp = alloc_printf("%s/queue/.state/", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* Directory for flagging queue entries that went through
-     deterministic fuzzing in the past. */
-
-  tmp = alloc_printf("%s/queue/.state/deterministic_done/", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* Directory with the auto-selected dictionary entries. */
-
-  tmp = alloc_printf("%s/queue/.state/auto_extras/", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* The set of paths currently deemed redundant. */
-
-  tmp = alloc_printf("%s/queue/.state/redundant_edges/", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* The set of paths showing variable behavior. */
-
-  tmp = alloc_printf("%s/queue/.state/variable_behavior/", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* Sync directory for keeping track of cooperating fuzzers. */
-
-  if (sync_id) {
-
-    tmp = alloc_printf("%s/.synced/", out_dir);
-
-    if (mkdir(tmp, 0700) && (!in_place_resume || errno != EEXIST))
-      PFATAL("Unable to create '%s'", tmp);
-
-    ck_free(tmp);
-
-  }
-
-  /* All recorded crashes. */
-
-  tmp = alloc_printf("%s/crashes", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* All recorded hangs. */
-
-  tmp = alloc_printf("%s/hangs", out_dir);
-  if (mkdir(tmp, 0700)) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  /* Generally useful file descriptors. */
-
-  dev_null_fd = open("/dev/null", O_RDWR);
-  if (dev_null_fd < 0) PFATAL("Unable to open /dev/null");
-
-#ifndef HAVE_ARC4RANDOM
-  dev_urandom_fd = open("/dev/urandom", O_RDONLY);
-  if (dev_urandom_fd < 0) PFATAL("Unable to open /dev/urandom");
-#endif
-
-  /* Gnuplot output file. */
-
-  tmp = alloc_printf("%s/plot_data", out_dir);
-  fd = open(tmp, O_WRONLY | O_CREAT | O_EXCL, 0600);
-  if (fd < 0) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  plot_file = fdopen(fd, "w");
-  if (!plot_file) PFATAL("fdopen() failed");
-
-  fprintf(plot_file, "# unix_time, cycles_done, cur_path, paths_total, "
-                     "pending_total, pending_favs, map_size, unique_crashes, "
-                     "unique_hangs, max_depth, execs_per_sec\n");
-                     /* ignore errors */
-
-}
-
-static void setup_cmdline_file(char** argv) {
-  u8* tmp;
-  s32 fd;
-  u32 i = 0;
-
-  FILE* cmdline_file = NULL;
-
-  /* Store the command line to reproduce our findings */
-  tmp = alloc_printf("%s/cmdline", out_dir);
-  fd = open(tmp, O_WRONLY | O_CREAT | O_EXCL, 0600);
-  if (fd < 0) PFATAL("Unable to create '%s'", tmp);
-  ck_free(tmp);
-
-  cmdline_file = fdopen(fd, "w");
-  if (!cmdline_file) PFATAL("fdopen() failed");
-
-  while (argv[i]) {
-    fprintf(cmdline_file, "%s\n", argv[i]);
-    ++i;
-  }
-
-  fclose(cmdline_file);
-}
-
-
-/* Setup the output file for fuzzed data, if not using -f. */
-
-void setup_stdio_file(void) {
-
-  u8* fn;
-  if (file_extension) {
-    fn = alloc_printf("%s/.cur_input.%s", out_dir, file_extension);
-  } else {
-    fn = alloc_printf("%s/.cur_input", out_dir);
-  }
-
-  unlink(fn); /* Ignore errors */
-
-  out_fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600);
-
-  if (out_fd < 0) PFATAL("Unable to create '%s'", fn);
-
-  ck_free(fn);
-
-}
-
-
-/* Make sure that core dumps don't go to a program. */
-
-static void check_crash_handling(void) {
-
-#ifdef __APPLE__
-
-  /* Yuck! There appears to be no simple C API to query for the state of 
-     loaded daemons on MacOS X, and I'm a bit hesitant to do something
-     more sophisticated, such as disabling crash reporting via Mach ports,
-     until I get a box to test the code. So, for now, we check for crash
-     reporting the awful way. */
-  
-  if (system("launchctl list 2>/dev/null | grep -q '\\.ReportCrash$'")) return;
-
-  SAYF("\n" cLRD "[-] " cRST
-       "Whoops, your system is configured to forward crash notifications to an\n"
-       "    external crash reporting utility. This will cause issues due to the\n"
-       "    extended delay between the fuzzed binary malfunctioning and this fact\n"
-       "    being relayed to the fuzzer via the standard waitpid() API.\n\n"
-       "    To avoid having crashes misinterpreted as timeouts, please run the\n" 
-       "    following commands:\n\n"
-
-       "    SL=/System/Library; PL=com.apple.ReportCrash\n"
-       "    launchctl unload -w ${SL}/LaunchAgents/${PL}.plist\n"
-       "    sudo launchctl unload -w ${SL}/LaunchDaemons/${PL}.Root.plist\n");
-
-  if (!getenv("AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES"))
-    FATAL("Crash reporter detected");
-
-#else
-
-  /* This is Linux specific, but I don't think there's anything equivalent on
-     *BSD, so we can just let it slide for now. */
-
-  s32 fd = open("/proc/sys/kernel/core_pattern", O_RDONLY);
-  u8  fchar;
-
-  if (fd < 0) return;
-
-  ACTF("Checking core_pattern...");
-
-  if (read(fd, &fchar, 1) == 1 && fchar == '|') {
-
-    SAYF("\n" cLRD "[-] " cRST
-         "Hmm, your system is configured to send core dump notifications to an\n"
-         "    external utility. This will cause issues: there will be an extended delay\n"
-         "    between stumbling upon a crash and having this information relayed to the\n"
-         "    fuzzer via the standard waitpid() API.\n\n"
-
-         "    To avoid having crashes misinterpreted as timeouts, please log in as root\n" 
-         "    and temporarily modify /proc/sys/kernel/core_pattern, like so:\n\n"
-
-         "    echo core >/proc/sys/kernel/core_pattern\n");
-
-    if (!getenv("AFL_I_DONT_CARE_ABOUT_MISSING_CRASHES"))
-      FATAL("Pipe at the beginning of 'core_pattern'");
-
-  }
- 
-  close(fd);
-
-#endif /* ^__APPLE__ */
-
-}
-
-
-/* Check CPU governor. */
-
-static void check_cpu_governor(void) {
-#ifdef __linux__
-  FILE* f;
-  u8 tmp[128];
-  u64 min = 0, max = 0;
-
-  if (getenv("AFL_SKIP_CPUFREQ")) return;
-
-  if (cpu_aff > 0)
-    snprintf(tmp, sizeof(tmp), "%s%d%s", "/sys/devices/system/cpu/cpu", cpu_aff, "/cpufreq/scaling_governor");
-  else
-    snprintf(tmp, sizeof(tmp), "%s", "/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor");
-  f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", "r");
-  if (!f) {
-    if (cpu_aff > 0)
-      snprintf(tmp, sizeof(tmp), "%s%d%s", "/sys/devices/system/cpu/cpufreq/policy", cpu_aff, "/scaling_governor");
-    else
-      snprintf(tmp, sizeof(tmp), "%s", "/sys/devices/system/cpu/cpufreq/policy0/scaling_governor");
-    f = fopen(tmp, "r");
-  }
-  if (!f) {
-    WARNF("Could not check CPU scaling governor");
-    return;
-  }
-
-  ACTF("Checking CPU scaling governor...");
-
-  if (!fgets(tmp, 128, f)) PFATAL("fgets() failed");
-
-  fclose(f);
-
-  if (!strncmp(tmp, "perf", 4)) return;
-
-  f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq", "r");
-
-  if (f) {
-    if (fscanf(f, "%llu", &min) != 1) min = 0;
-    fclose(f);
-  }
-
-  f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq", "r");
-
-  if (f) {
-    if (fscanf(f, "%llu", &max) != 1) max = 0;
-    fclose(f);
-  }
-
-  if (min == max) return;
-
-  SAYF("\n" cLRD "[-] " cRST
-       "Whoops, your system uses on-demand CPU frequency scaling, adjusted\n"
-       "    between %llu and %llu MHz. Unfortunately, the scaling algorithm in the\n"
-       "    kernel is imperfect and can miss the short-lived processes spawned by\n"
-       "    afl-fuzz. To keep things moving, run these commands as root:\n\n"
-
-       "    cd /sys/devices/system/cpu\n"
-       "    echo performance | tee cpu*/cpufreq/scaling_governor\n\n"
-
-       "    You can later go back to the original state by replacing 'performance' with\n"
-       "    'ondemand'. If you don't want to change the settings, set AFL_SKIP_CPUFREQ\n"
-       "    to make afl-fuzz skip this check - but expect some performance drop.\n",
-       min / 1024, max / 1024);
-
-  FATAL("Suboptimal CPU scaling governor");
-#endif
-}
-
-
-/* Count the number of logical CPU cores. */
-
-static void get_core_count(void) {
-
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__)
-
-  size_t s = sizeof(cpu_core_count);
-
-  /* On *BSD systems, we can just use a sysctl to get the number of CPUs. */
-
-#ifdef __APPLE__
-
-  if (sysctlbyname("hw.logicalcpu", &cpu_core_count, &s, NULL, 0) < 0)
-    return;
-
-#else
-
-  int s_name[2] = { CTL_HW, HW_NCPU };
-
-  if (sysctl(s_name, 2, &cpu_core_count, &s, NULL, 0) < 0) return;
-
-#endif /* ^__APPLE__ */
-
-#else
-
-#ifdef HAVE_AFFINITY
-
-  cpu_core_count = sysconf(_SC_NPROCESSORS_ONLN);
-
-#else
-
-  FILE* f = fopen("/proc/stat", "r");
-  u8 tmp[1024];
-
-  if (!f) return;
-
-  while (fgets(tmp, sizeof(tmp), f))
-    if (!strncmp(tmp, "cpu", 3) && isdigit(tmp[3])) ++cpu_core_count;
-
-  fclose(f);
-
-#endif /* ^HAVE_AFFINITY */
-
-#endif /* ^(__APPLE__ || __FreeBSD__ || __OpenBSD__) */
-
-  if (cpu_core_count > 0) {
-
-    u32 cur_runnable = 0;
-
-    cur_runnable = (u32)get_runnable_processes();
-
-#if defined(__APPLE__) || defined(__FreeBSD__) || defined (__OpenBSD__)
-
-    /* Add ourselves, since the 1-minute average doesn't include that yet. */
-
-    ++cur_runnable;
-
-#endif /* __APPLE__ || __FreeBSD__ || __OpenBSD__ */
-
-    OKF("You have %d CPU core%s and %u runnable tasks (utilization: %0.0f%%).",
-        cpu_core_count, cpu_core_count > 1 ? "s" : "",
-        cur_runnable, cur_runnable * 100.0 / cpu_core_count);
-
-    if (cpu_core_count > 1) {
-
-      if (cur_runnable > cpu_core_count * 1.5) {
-
-        WARNF("System under apparent load, performance may be spotty.");
-
-      } else if (cur_runnable + 1 <= cpu_core_count) {
-
-        OKF("Try parallel jobs - see %s/parallel_fuzzing.txt.", doc_path);
-  
-      }
-
-    }
-
-  } else {
-
-    cpu_core_count = 0;
-    WARNF("Unable to figure out the number of CPU cores.");
-
-  }
-
-}
-
-
-/* Validate and fix up out_dir and sync_dir when using -S. */
-
-static void fix_up_sync(void) {
-
-  u8* x = sync_id;
-
-  if (dumb_mode)
-    FATAL("-S / -M and -n are mutually exclusive");
-
-  if (skip_deterministic) {
-
-    if (force_deterministic)
-      FATAL("use -S instead of -M -d");
-    //else
-    //  FATAL("-S already implies -d");
-
-  }
-
-  while (*x) {
-
-    if (!isalnum(*x) && *x != '_' && *x != '-')
-      FATAL("Non-alphanumeric fuzzer ID specified via -S or -M");
-
-    ++x;
-
-  }
-
-  if (strlen(sync_id) > 32) FATAL("Fuzzer ID too long");
-
-  x = alloc_printf("%s/%s", out_dir, sync_id);
-
-  sync_dir = out_dir;
-  out_dir  = x;
-
-  if (!force_deterministic) {
-    skip_deterministic = 1;
-    use_splicing = 1;
-  }
-
-}
-
-
-/* Handle screen resize (SIGWINCH). */
-
-static void handle_resize(int sig) {
-  clear_screen = 1;
-}
-
-
-/* Check ASAN options. */
-
-static void check_asan_opts(void) {
-  u8* x = getenv("ASAN_OPTIONS");
-
-  if (x) {
-
-    if (!strstr(x, "abort_on_error=1"))
-      FATAL("Custom ASAN_OPTIONS set without abort_on_error=1 - please fix!");
-
-    if (!strstr(x, "symbolize=0"))
-      FATAL("Custom ASAN_OPTIONS set without symbolize=0 - please fix!");
-
-  }
-
-  x = getenv("MSAN_OPTIONS");
-
-  if (x) {
-
-    if (!strstr(x, "exit_code=" STRINGIFY(MSAN_ERROR)))
-      FATAL("Custom MSAN_OPTIONS set without exit_code="
-            STRINGIFY(MSAN_ERROR) " - please fix!");
-
-    if (!strstr(x, "symbolize=0"))
-      FATAL("Custom MSAN_OPTIONS set without symbolize=0 - please fix!");
-
-  }
-
-} 
-
-
-/* Set up signal handlers. More complicated that needs to be, because libc on
-   Solaris doesn't resume interrupted reads(), sets SA_RESETHAND when you call
-   siginterrupt(), and does other stupid things. */
-
-void setup_signal_handlers(void) {
-
-  struct sigaction sa;
-
-  sa.sa_handler   = NULL;
-  sa.sa_flags     = SA_RESTART;
-  sa.sa_sigaction = NULL;
-
-  sigemptyset(&sa.sa_mask);
-
-  /* Various ways of saying "stop". */
-
-  sa.sa_handler = handle_stop_sig;
-  sigaction(SIGHUP, &sa, NULL);
-  sigaction(SIGINT, &sa, NULL);
-  sigaction(SIGTERM, &sa, NULL);
-
-  /* Exec timeout notifications. */
-
-  sa.sa_handler = handle_timeout;
-  sigaction(SIGALRM, &sa, NULL);
-
-  /* Window resize */
-
-  sa.sa_handler = handle_resize;
-  sigaction(SIGWINCH, &sa, NULL);
-
-  /* SIGUSR1: skip entry */
-
-  sa.sa_handler = handle_skipreq;
-  sigaction(SIGUSR1, &sa, NULL);
-
-  /* Things we don't care about. */
-
-  sa.sa_handler = SIG_IGN;
-  sigaction(SIGTSTP, &sa, NULL);
-  sigaction(SIGPIPE, &sa, NULL);
-
-}
-
-
-/* Rewrite argv for QEMU. */
-
-static char** get_qemu_argv(u8* own_loc, char** argv, int argc) {
-
-  char** new_argv = ck_alloc(sizeof(char*) * (argc + 4));
-  u8 *tmp, *cp, *rsl, *own_copy;
-
-  memcpy(new_argv + 3, argv + 1, sizeof(char*) * argc);
-
-  new_argv[2] = target_path;
-  new_argv[1] = "--";
-
-  /* Now we need to actually find the QEMU binary to put in argv[0]. */
-
-  tmp = getenv("AFL_PATH");
-
-  if (tmp) {
-
-    cp = alloc_printf("%s/afl-qemu-trace", tmp);
-
-    if (access(cp, X_OK))
-      FATAL("Unable to find '%s'", tmp);
-
-    target_path = new_argv[0] = cp;
-    return new_argv;
-
-  }
-
-  own_copy = ck_strdup(own_loc);
-  rsl = strrchr(own_copy, '/');
-
-  if (rsl) {
-
-    *rsl = 0;
-
-    cp = alloc_printf("%s/afl-qemu-trace", own_copy);
-    ck_free(own_copy);
-
-    if (!access(cp, X_OK)) {
-
-      target_path = new_argv[0] = cp;
-      return new_argv;
-
-    }
-
-  } else ck_free(own_copy);
-
-  if (!access(BIN_PATH "/afl-qemu-trace", X_OK)) {
-
-    target_path = new_argv[0] = ck_strdup(BIN_PATH "/afl-qemu-trace");
-    return new_argv;
-
-  }
-
-  SAYF("\n" cLRD "[-] " cRST
-       "Oops, unable to find the 'afl-qemu-trace' binary. The binary must be built\n"
-       "    separately by following the instructions in qemu_mode/README.qemu. If you\n"
-       "    already have the binary installed, you may need to specify AFL_PATH in the\n"
-       "    environment.\n\n"
-
-       "    Of course, even without QEMU, afl-fuzz can still work with binaries that are\n"
-       "    instrumented at compile time with afl-gcc. It is also possible to use it as a\n"
-       "    traditional \"dumb\" fuzzer by specifying '-n' in the command line.\n");
-
-  FATAL("Failed to locate 'afl-qemu-trace'.");
-
-}
-
-/* Make a copy of the current command line. */
-
-static void save_cmdline(u32 argc, char** argv) {
-
-  u32 len = 1, i;
-  u8* buf;
-
-  for (i = 0; i < argc; ++i)
-    len += strlen(argv[i]) + 1;
-  
-  buf = orig_cmdline = ck_alloc(len);
-
-  for (i = 0; i < argc; ++i) {
-
-    u32 l = strlen(argv[i]);
-
-    memcpy(buf, argv[i], l);
-    buf += l;
-
-    if (i != argc - 1) *(buf++) = ' ';
-
-  }
-
-  *buf = 0;
-
-}
-
-int stricmp(char const *a, char const *b) {
+static int stricmp(char const *a, char const *b) {
   for (;; ++a, ++b) {
     int d;
     d = tolower(*a) - tolower(*b);
@@ -9740,8 +91,6 @@ int stricmp(char const *a, char const *b) {
   }
 }
 
-#ifndef AFL_LIB
-
 /* Main entry point */
 
 int main(int argc, char** argv) {