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--- qemu-2.10.0-rc3-clean/linux-user/syscall.c 2017-08-15 11:39:41.000000000 -0700
+++ qemu-2.10.0-rc3/linux-user/syscall.c 2017-08-22 14:34:03.193088186 -0700
@@ -116,6 +116,8 @@
#include "qemu.h"
+extern unsigned int afl_forksrv_pid;
+
#ifndef CLONE_IO
#define CLONE_IO 0x80000000 /* Clone io context */
#endif
@@ -11688,8 +11690,21 @@
break;
case TARGET_NR_tgkill:
- ret = get_errno(safe_tgkill((int)arg1, (int)arg2,
- target_to_host_signal(arg3)));
+
+ {
+ int pid = (int)arg1,
+ tgid = (int)arg2,
+ sig = (int)arg3;
+
+ /* Not entirely sure if the below is correct for all architectures. */
+
+ if(afl_forksrv_pid && afl_forksrv_pid == pid && sig == SIGABRT)
+ pid = tgid = getpid();
+
+ ret = get_errno(safe_tgkill(pid, tgid, target_to_host_signal(sig)));
+
+ }
+
break;
#ifdef TARGET_NR_set_robust_list
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