Re: tracking down crash/error in app running on fed/centos

[Jack Craig]

On Wed, Oct 1, 2014 at 12:30 PM, bruce <badouglas(a)gmail.com&gt; wrote:

>  Hi guys.
>
>  running an app in both fed/centos test machines and getting a seg fault.
>
>  I know this is a bit off topic, but it does related to segfault
>  crashes, and how to get/setup the data to analyze track down the
>  offending code!
>
>  to begin,
>  the system has /var/log/messages with
>  Sep 30 11:40:57 dell2 kernel: courseSectionDa[3270]: segfault at 868
>  ip 00007f80e8e1e410 sp 00007fffe404d0c8 error 4 in
>  libgearman.so.8.0.0[7f80e8e18000+26000]
>
>  isn't this saying the crash is coming from the libgearman.so.8.0.0 as
>  opposed to the parent php app which uses the gearman lib??
>
>  and assuming that this is the case, and i installed the gearman so
>  with yum (without source) is there a way I can setup the system to
>  capture the crash data to do an analysis of the crash??
>
>  the parent app runs multiple (1000s) of times, and somewhere the crash
>  occurs..
>
>  thanks guys..
>  --
>  users mailing list
>  users(a)lists.fedoraproject.org
>  To unsubscribe or change subscription options:
>  https://admin.fedoraproject.org/mailman/listinfo/users
>  Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
>  Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
>  Have a question? Ask away: http://ask.fedoraproject.org
>  
you may find tools like strace to see what, in terms of system calls,
preceded the crash.

note the -f option to follow new sub processes.

pstree can be fun, ...

try, ...

watch "pstree -p 1638"


where '1638' is a processes spewing subprocesses of interest.

hth, ...

sudo yum install strace watch pstree