Re: [Xenomai] [xenomai-forge] psos: crash while stressing event timers

[Philippe Gerum <rpm@xenomai.org>]

On 06/05/2013 10:36 AM, Philippe Gerum wrote:
> On 06/05/2013 10:28 AM, Ronny Meeus wrote:
>
>> the testcode is attached to the initial mail.
>> The issue can be reproduced in all kinds of environments.
>>
>
> Ok, I overlooked the link. I'll have a look and let you know, thanks.
>

I can reproduce this bug as well, at least a bug with the same symptoms.

Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `./settime --cpu-affinity=0,1,2 --silent -s -t 1 
-b 30 -o 1'.
Program terminated with signal 11, Segmentation fault.
#0  malloc_consolidate (av=av@entry=0x7f6f7c000020) at malloc.c:4143
4143		    unlink(av, p, bck, fwd);
(gdb) bt
#0  malloc_consolidate (av=av@entry=0x7f6f7c000020) at malloc.c:4143
#1  0x0000003d7147c988 in _int_free (av=0x7f6f7c000020, p=0x7f6f7c000990,
     have_lock=0) at malloc.c:4043
#2  0x00007f6fe6d14f3a in pvfree (ptr=0x7f6f7c0009a0)
     at /home/rpm/git/xenomai-forge/include/copperplate/heapobj.h:156
#3  0x00007f6fe6d15062 in delete_timer (tm=0x7f6f7c0009a0)
     at /home/rpm/git/xenomai-forge/lib/psos/tm.c:67
#4  0x00007f6fe6d150d5 in post_event_once (tmobj=0x7f6f7c0009b8)
     at /home/rpm/git/xenomai-forge/lib/psos/tm.c:80
#5  0x00007f6fe6adbd99 in timerobj_server (arg=0x0)
     at /home/rpm/git/xenomai-forge/lib/copperplate/timerobj.c:205
#6  0x0000003d71c07d15 in start_thread (arg=0x7f6fe67a3700)
     at pthread_create.c:308
#7  0x0000003d714f248d in clone ()
     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:114
(gdb) q

However, I have to allow multiple CPUs for running the test, pinning it 
with --cpu-affinity on a single processor papers over the issue it 
seems. Ok, digging it.

-- 
Philippe.