[Bug sanitizer/82109] False positive when using pthread_cleanup_push() and pthread_cancel()

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82109

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-23
     Ever confirmed|0                           |1

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, note that when a cleanup_routine is executed, it has following
back-trace:

(gdb) bt
#0  cleanup_routine (arg=0x0) at asan_pthread_cancel.c:9
#1  0x00000000004014ed in start_routine (arg=0x7fffffffdae0) at
asan_pthread_cancel.c:24
#2  0x00007ffff6df7554 in start_thread (arg=<optimized out>) at
pthread_create.c:463
#3  0x00007ffff6b2accf in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

So it's a longjmp probably. The test-case is very trick, probably not fixable
easy. Note that you should not do a fancy stuff in a pthread cleanup function.