[asterisk-users] Advices when Asterisk segfaults and nothing useful in logs

[George Joseph]

On Tue, Feb 14, 2017 at 10:21 AM, Olivier <oza.4h07 at gmail.com> wrote:

> Hello,
>
> I've got a 13.13.1 system using PJSIP stack on debian Jessie.
> It runs from 50 to 100 simultaneous calls (so 100 to 200  PJSIP channels)
> all day long.
> From time to time, roughly meaning once a month, it segfaults  with lines
> (from dmesg -T output) like this:
> asterisk[1160]: segfault at 7efffffe ip 00000000005881d6 sp
> 00007fec95c33910 error 4 in asterisk[400000+2a2000]
>
>
> Debug level was unfortunately not set in asterisk.conf but verbose level
> was set to 5.
> Asterisk runs with:
> /usr/sbin/asterisk -U asterisk -G asterisk -g
>
> Asterisk is compiled with DONT_OPTIMIZE and BETTER_BACKTRACES options.
>
> "core show settings" outputs:
> * Directories
>   -------------
>   Configuration file:
>   Configuration directory:     /etc/asterisk
>   Module directory:            /usr/lib/asterisk/modules
>   Spool directory:             /var/spool/asterisk
>   Log directory:               /var/log/asterisk
>   Run/Sockets directory:       /var/run/asterisk
>   PID file:                    /var/run/asterisk/asterisk.pid
>   VarLib directory:            /var/lib/asterisk
>   Data directory:              /var/lib/asterisk
>   ASTDB:                       /var/lib/asterisk/astdb
>   IAX2 Keys directory:         /var/lib/asterisk/keys
>
>
>
> 1. Am I correct to expect a coredump file to be produced anytime asterisk
> segfaults ?
>

Yes if -g is set and the user that's running asterisk has permissions to
set ulimit -c.


>
> 2. Does Asterisk prints any WARNING or ERROR message whenever it detects,
> at startup preferably, that it has not required permissions to write a
> coredump file ?
>

No because it's the system that determines where a coredump goes and
actually writes it, not asterisk.
It's the sysctl kernel.core_pattern setting.


>
> 3. Among above directories, which one is choosen to save coredump files ?
> Is it something that can/should be configured in /etc/asterisk (I've seen
> related options in some debian  /etc/default/asterisk files but I would be
> curious to know if such things exist
>

See above.


>
> 4. Is there anything useful I can do with a line such as :
> asterisk[1160]: segfault at 7efffffe ip 00000000005881d6 sp
> 00007fec95c33910 error 4 in asterisk[400000+2a2000] ? Any pointer ?
>

Nope.  Not a thing.  Sorry.



>
> 5. Suggestions ?
>

If you can at least get the system to write a coredump file, there are new
utilities in /var/lib/asterisk/scripts, namely ast_coredumper which can
help create the backtraces if it can at least find the core file.  Just run
"./ast_coredumper --help" for more info.   You should also be able to use
those utilities with earlier Asterisk 13 versions.



>
> Best regards
>
>
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-- 
George Joseph
Digium, Inc. | Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org
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