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

[George Joseph]

On Tue, Feb 14, 2017 at 2:51 PM, George Joseph <gjoseph at digium.com> wrote:

>
>
> 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.
>
>
>

Oh yeah, and it's on my list to publish instructions on how ot use those
utilities but they were just released yesterday.



>
>> 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
>
>


-- 
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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