[asterisk-users] [SOLVED] Re: Feature Request: what about "core stop panic" ?

Olivier oza.4h07 at gmail.com
Wed Sep 7 12:03:59 CDT 2016 

2016-09-06 14:37 GMT+02:00 George Joseph <gjoseph at digium.com>:

>
>
> On Tue, Sep 6, 2016 at 1:55 AM, Olivier <oza.4h07 at gmail.com> wrote:
>
>> Hello,
>>
>> After testing "pkill -SEGV -f /usr/sbin/asterisk" on Debian Jessie
>> platform, I've got several questions :
>>
>>
>> 1.  When I issue a "cd /tmp; asterisk -cvvvvvvvvvvvg -U asterisk -G
>> asterisk" command, and then issue a "pkill -SEGV asterisk" command,
>> I can read on Asterisk console:
>> *CLI> Segmentation error (core dumped)
>> (*) I translated into english the exact output I got.
>>
>> I see a /tmp/core file exists.
>>
>> My asterisk.conf includes:
>> full = verbose,notice,warning,error,debug
>>
>> After Asterisk's stop, my /var/log:asterisk/full doesn't include any
>> mention to Segmentation error.
>> I cannot find anything in dmesg, /var/log/messages or /var/log/kern.log
>> as I did when a real segmentation fault occurred on production system.
>>
>> I would expect Asterisk to log something.
>> Is this expected behaviour ?
>>
>
> Yes.  Asterisk can't really log anything when it ends abruptly because of
> critical signals like SEGV and since it was user initiated, rather than an
> actual SEGV, there won't be a message in the kernel log buffer.
>
>
>>
>>
>> 2. When I issue a "cd /tmp; systemctl start asterisk" command, and then
>> issue a "pkill -SEGV asterisk" command,
>> I can read on Asterisk console:
>> Disconnected from Asterisk server
>> Asterisk cleanly ending (0).
>> Executing last minute cleanups
>>
>> I cannot find any core file anyware.
>>
>> File /var/log:asterisk/full doesn't include any mention to Segmentation
>> error.
>>
>> Where should core file be created when Asterisk is run as a daemon by
>> asterisk user and group ?
>> Is there a setting I can use to specify the directory used (so that we
>> can make sure appropriate ownership is set) ?
>>
>
> "$ sysctl kernel.core_pattern" will show you where core files are
> written.  For Asterisk to produce the core file, it has to be started with
> the '-g' option so make sure your asterisk.service file is adding the
> option.
>
>
My system shows:
# ps aux | grep asteri
asterisk   429  7.3  2.4  59468 25088 ?        Ssl  18:47   0:03
/usr/sbin/asterisk -U asterisk -G asterisk -g
...
# sysctl kernel.core_pattern
kernel.core_pattern = core

Option -g is present.

So either, the "pkill -SEGV asterisk" command  doesn't trigger any coredump
"Asterisk cleanly ending (0)",
either the core dump is not produced (find / -name "core.*" doesn't find
anything) for some reason.


>
>
>>
>> Cheers
>>
>>
>> 2016-09-05 13:36 GMT+02:00 Olivier <oza.4h07 at gmail.com>:
>>
>>>
>>>
>>> 2016-09-02 20:40 GMT+02:00 George Joseph <gjoseph at digium.com>:
>>>
>>>>
>>>>
>>>> On Fri, Sep 2, 2016 at 9:34 AM, Olivier <oza.4h07 at gmail.com> wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I had a recent case where Asterisk stopped due to a segfault.
>>>>> This reminded me that being sure that whenever such issue occurs, it's
>>>>> useful to have a core file or various data at hand to analyze and exchange
>>>>> with support teams.
>>>>>
>>>>> How can you double check a running Asterisk system would produce such
>>>>> data if a segfault arrises ?
>>>>>
>>>>> 1. To my knowledge, no tool exists for this. Is it correct ?
>>>>> 2. If such tool do not exist, what would you say about something like
>>>>> "core stop panic", "core stop segfault" or whatever ?
>>>>>
>>>>
>>>>
>>>> How about just running "pkill -SEGV -f /usr/sbin/asterisk" from the
>>>> shell?
>>>>
>>>
>>> It seems to comply to what I'm after.
>>> Thank you very for sharing this here.
>>>
>>>
>>>
>>>
>>>> Works for me.
>>>>
>>>>
>>>>
>>>>>
>>>>> Best Regards
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> _____________________________________________________________________
>>>>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>>>>
>>>>> Join the Asterisk Community at the 13th AstriCon, September 27-29, 2016
>>>>>       http://www.asterisk.org/community/astricon-user-conference
>>>>>
>>>>> New to Asterisk? Start here:
>>>>>       https://wiki.asterisk.org/wiki/display/AST/Getting+Started
>>>>>
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>>>>>    http://lists.digium.com/mailman/listinfo/asterisk-users
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> 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 --
>>>>
>>>> Join the Asterisk Community at the 13th AstriCon, September 27-29, 2016
>>>>       http://www.asterisk.org/community/astricon-user-conference
>>>>
>>>> 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
>>>>
>>>
>>>
>>
>> --
>> _____________________________________________________________________
>> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>>
>> Join the Asterisk Community at the 13th AstriCon, September 27-29, 2016
>>       http://www.asterisk.org/community/astricon-user-conference
>>
>> 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
>>
>
>
>
> --
> 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 --
>
> Join the Asterisk Community at the 13th AstriCon, September 27-29, 2016
>       http://www.asterisk.org/community/astricon-user-conference
>
> 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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