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

[Olivier]

Hi George,

How does ast_coredumper compare to ast_grab_core ) ?
Is it worth learning to use both or shall favor one ?

PS: As I don't know either program, yet, my question may seem silly.
Please, forgive me for this

2017-02-14 22:52 GMT+01:00 George Joseph <gjoseph at digium.com>:

>
>
> 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
>>>
>>>
>>> --
>>> _____________________________________________________________________
>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>
>>> Check out the new Asterisk community forum at:
>>> https://community.asterisk.org/
>>>
>>> New to Asterisk? Start here:
>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>
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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
>
>
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> Check out the new Asterisk community forum at: https://community.asterisk.
> org/
>
> New to Asterisk? Start here:
>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>    http://lists.digium.com/mailman/listinfo/asterisk-users
>
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