On Wed, Oct 1, 2014 at 12:30 PM, bruce <badouglas@xxxxxxxxx> 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..
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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"
watch "pstree -p 1638"
where '1638' is a processes spewing subprocesses of interest.
hth, ...
sudo yum install strace watch pstree
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