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List:       asterisk-dev
Subject:    Re: [asterisk-dev] segfault in asterisk 1.6.1.6 chan_iax2 after
From:       David Vossel <dvossel () digium ! com>
Date:       2009-09-30 16:40:55
Message-ID: 21266299.118591254328855137.JavaMail.root () jupiler ! digium ! com
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----- "Robert Verspuy" <robert@exa-omicron.nl> wrote:

> I'm running Asterisk 1.6.1.6 since 19 days now,
> but I've had 3 times a segfault on the same address.
> 
> Sep 17 13:03:57 switch02 kernel: asterisk[13597]: segfault at 
> 00002aaa0000000a rip 0000000000435c36 rsp 00000000420b1440 error 4
> In the mean time 75.517 calls were setup.
> Sep 22 19:07:13 switch02 kernel: asterisk[23982]: segfault at 
> 00002aaa0000000a rip 0000000000435c36 rsp 0000000042142440 error 4
> In the mean time  76.725 calls were setup.
> Sep 28 14:26:16 switch02 kernel: asterisk[2777]: segfault at 
> 00002aaa0000000a rip 0000000000435c36 rsp 0000000042088440 error 4
> 
> When running gdb on the coredump:
> 
> Core was generated by `/usr/sbin/asterisk -f -vvvg -c'.
> Program terminated with signal 11, Segmentation fault.
> #0  _ao2_find (c=0x2aaa00000002, arg=0x420884d0, flags=OBJ_POINTER) at
> 
> astobj2.c:712
> 712        return __ao2_callback(c,flags, cb_fn, arg, NULL, NULL, 0,
> NULL);
> (gdb) bt
> #0  _ao2_find (c=0x2aaa00000002, arg=0x420884d0, flags=OBJ_POINTER) at
> 
> astobj2.c:712
> #1  0x00002aaac090e2ae in __find_callno (callno=1, dcallno=26995, 
> sin=0x4208ce80, new=0, sockfd=14, return_locked=0, check_dcallno=1) at
> 
> chan_iax2.c:2450
> #2  0x00002aaac091b570 in socket_process (thread=0x7c0eaa0) at 
> chan_iax2.c:2582
> #3  0x00002aaac0926459 in iax2_process_thread (data=0x7c0eaa0) at 
> chan_iax2.c:10933
> #4  0x00000000004f28ac in dummy_start (data=<value optimized out>) at
> 
> utils.c:968
> #5  0x0000003b07a06367 in start_thread () from /lib64/libpthread.so.0
> #6  0x0000003b06ed309d in clone () from /lib64/libc.so.6
> 
> It's a live server running production traffic. So I don't have much 
> possibilities to easily test a different version.
> Also the issue only happens to me once a week (about once every
> approx. 
> 75.000 calls).
> The segfault didn't happen on the most busiest times (sunday), but
> just 
> on the more quiet days.
> 
> The last time the server had 50 calls, 97 channels (43 chan_ss7 
> channels, 46 sip channels and 8 iax2 channels)
> 
> Software running:
> - CentOS 5 (latest updates as of 11 sept 2009)
> - asterisk 1.6.1.6
> - chan_ss7 1.2.1
> - dahdi-linux 2.2.0.2
> - dahdi-tools 2.2.0
> - wanpipe 3.5.6
> 
> Is there any other information I can get from the core file to 
> understand what's going wrong,
> and how to fix it?
> 
> Thnx,
> Robert Verspuy

I investigated this for a bit and was not able to identify the problem immediately \
based upon the back trace.  If you could, and haven't already, this should be \
documented on our bug tracker issues.asterisk.org.  Thanks for reporting this!

~Vossel

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