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Old 06-12-2012, 11:17 PM
SolidShellSecurity SolidShellSecurity is offline
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Join Date: Jun 2012
Posts: 31
Thumbs up exit signal Segmentation fault (11) – cPanel – Enable Apche core dump

If you are seeing “Segmentation fault (11)” entry in apache error log on your server, it tells something is wrong with your web server ( perhaps causing by any specific modules ). The best way to track the source of the error is by enabling apache coredump feature. To do it on a cPanel server, follow the below steps!

1. Enable coredump in httpd.conf. For that add the following directive to /usr/local/apache/conf/httpd.conf

CoreDumpDirectory /tmp/httpdump

2. Create the coredump directory and set necessory permission / ownership

mkdir /tmp/httpdump
chown nobody:nobody /tmp/httpdump
chmod 775 /tmp/httpdump

3. Now run apache distiller and rebuild httpd.conf

/usr/local/cpanel/bin/apache_conf_distiller –update
/usr/local/cpanel/bin/build_apache_conf

4. Edit /etc/init.d/httpd and add the following line to it, after the “ulimit” directives at the top of the script ( Apche inherit ulimit properties from the startup script )

ulimit -c unlimited

5. Now gracefully restart apache

/scripts/restartsrv http

6. Ok, we have completed the configuration. To check whether it’s working correctly send “SIGSEGV” to any of the apache child process.

Run – ps aux | grep http and pick a random PID
Run – tail -f /usr/local/apache/logs/error_log one terminal
Run – kill -SIGSEGV on terminal two and you can see a log entry as follows on terminal one

exit signal Segmentation fault (11), possible coredump in /tmp/httpdump

PS: Disable it when debugging is over!

source
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Old 06-13-2012, 03:31 AM
jitender jitender is offline
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Join Date: May 2012
Posts: 104
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very impressive, now you can find the problematic module and get full source too.

jitender
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