1 files changed, 13 insertions, 0 deletions
diff --git a/src/afl-fuzz.c b/src/afl-fuzz.c
index 8625c37c..9240526e 100644
--- a/src/afl-fuzz.c
+++ b/src/afl-fuzz.c
@@ -1065,8 +1065,21 @@ int main(int argc, char **argv_orig, char **envp) {
 
   init_count_class16();
 
+  if (afl->is_master && check_master_exists(afl) == 1) {
+
+    WARNF("It is wasteful to run more than one master!");
+
+  }
+
   setup_dirs_fds(afl);
 
+  if (afl->is_slave && check_master_exists(afl) == 0) {
+
+    WARNF("no -M master found. You need to run one master!");
+    sleep(5);
+
+  }
+
   setup_custom_mutators(afl);
 
   setup_cmdline_file(afl, argv + optind);