I seem to be able to generate this fairly reliably. Here's what gdb shows:
core was generated by `./timer_main'. Program terminated with signal SIGSEGV, Segmentation fault. #0 odp_atomic_fetch_inc_u64 (atom=<optimized out>) at ./include/odp/atomic.h:158 158 return __atomic_fetch_add(&atom->v, 1, __ATOMIC_RELAXED); (gdb) bt #0 odp_atomic_fetch_inc_u64 (atom=<optimized out>) at ./include/odp/atomic.h:158 #1 timer_notify (sigval=sigval@entry=...) at odp_timer.c:646 #2 0x00007f9a8b5dbeee in timer_sigev_thread (arg=0x7f9a840008c0) at ../sysdeps/unix/sysv/linux/timer_routines.c:62 #3 0x00007f9a8adcb6aa in start_thread (arg=0x7f9a889fe700) at pthread_create.c:333 #4 0x00007f9a8ab00eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 It appears that timer_notify() can get called with a bad sigval occasionally? Since timer_notify uses the returned value as a pointer without validating it that can cause easy segfaults. I did try adding a check--if (!tp) return; but I'm still seeing the segfault so something else may be causing the resulting area to be non-addressable. Perhaps a clue? On Wed, Sep 2, 2015 at 10:14 AM, <bugzilla-dae...@bugs.linaro.org> wrote: > *Comment # 10 <https://bugs.linaro.org/show_bug.cgi?id=1615#c10> on bug > 1615 <https://bugs.linaro.org/show_bug.cgi?id=1615> from Stuart Haslam > <stuart.has...@linaro.org> * > > I'm still seeing this occasionally, but I'm able to provoke it reliably like > this; > > ulimit -c unlimited > rm core > while true; do ./test/validation/timer/timer_main; [ -f core ] && break; done > > (may need to modify according to your /proc/sys/kernel/core_pattern) > > ------------------------------ > You are receiving this mail because: > > - You are the assignee for the bug. > - You are on the CC list for the bug. > > > _______________________________________________ > lng-odp mailing list > lng-odp@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/lng-odp > >
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