Re: segmentation Faults

Paul Doubek <pdoubek@xxxxxxxxxxxx> · Mon, 12 Sep 2011 09:19:10 -0600

I'm certainly no expert, but have you run a memory test on this server? 

Maybe it's a red herring, but the "Failed to read a valid object file 

image from memory" message and the fact that it's started crashing 

suddenly after working for 3 years would make me suspicious. If you 

don't have time to run memtest through it's paces, maybe you can try 

reseating/swapping around the RAM (or swapping compatible RAM from 

another less mission-critical server) and see if the nature of the 

problem changes or goes away.

Paul

On 9/12/2011 7:02 AM, dhottinger@xxxxxxxxxxxxxxxxxxxxxx wrote:

I recently started get seg faults on a production server that has been 

online for 3 years now.  At first I was convinced it was a faulty php 

script in one of the cms sites, but now it seems to happen fairly 

often.  I actually used a little bash script that restarts apache when 

it sees the segfault in the logfiles.  I have a core dump from the 

latest fault:

GNU gdb Red Hat Linux (6.3.0.0-1.134.fc5rh)
Copyright 2004 Free Software Foundation, Inc.

GDB is free software, covered by the GNU General Public License, and 

you are

welcome to change it and/or distribute copies of it under certain 

conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB.  Type "show warranty" for 

details.

This GDB was configured as "i386-redhat-linux-gnu"...(no debugging 

symbols found)

Using host libthread_db library "/lib/libthread_db.so.1".

Failed to read a valid object file image from memory.
Core was generated by `/usr/sbin/httpd'.
Program terminated with signal 11, Segmentation fault.
<SNIP>

Ive been trying to figure out what is causing the sudden onset of the 

segfaults, and havent pinpointed it yet.  If anyone can look at the 

coredump file and interpret it for me that would be great.  The 

websites that I think are causing the issue are using cms made simple 

1.6.8.

If there is a config change I can make to my httpd.conf that would 

alleviate this I would gladly do so.

Incidently when the segfaults occur, users get an error that the page 

can not be found, or server is refusing connection to that page.

Thanks for helping,
ddh

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