Apache Coredumps with RUID2

[GrandAdmiral]

Hi

I'm trying to debug a segmentation fault in Apache but I'm unable to get it to generate a coredump for analysis. I have followed the steps here
/http://sysadmin.carlusgg.com/?p=197 and here
/https://passwd.org/2012/03/apache-httpd-core-dump-instructions but still no luck

This is on CentOS 6.5 with mod_ruid2

 

[kdean]

Don't have an answer to your specific question, but if you recently updated to Apache 2.4.12, you segmentation faults may be due to the issue discussed in this thread:

http://forums.cpanel.net/f442/easyapache-3-28-3-released-451721.html

 

[GrandAdmiral]

Don't have an answer to your specific question, but if you recently updated to Apache 2.4.12, you segmentation faults may be due to the issue discussed in this thread:

http://forums.cpanel.net/f442/easyapache-3-28-3-released-451721.html

Definitely could be it, its fairly rare and I haven't had any complaints from clients.

Given that coredumps are a valuable diagnostic tool I'd still greatly appreciate it if someone has instructions for activating them.

 

[JacobPerkins]

Good morning,

There's a few things needed to get Apache to core dump properly:
Add this to httpd.conf:

 CoreDumpDirectory /tmp/mycoredump

Create this directory, make it owned by nobody and 777 permissions (both might not be required, I just did this to ensure it worked).

mkdir -p /tmp/mycoredump && chown nobody. /tmp/mycoredump && chmod 777 /tmp/mycoredump

After doing that, and ensuring that you have unlimited core dump file sizes (

 ulimit -c unlimited

), restart Apache and it should core dump for you.

I hope this helps!

 

[GrandAdmiral]

Thanks Jacob, I'll give that a try

 

[GrandAdmiral]

Hi Jacob

I'm still not able to get Apache to coredump, any other settings I should check?

 

[JacobPerkins]

Hi,

Are you getting any errors about the core dumps or are they just not being created?

 

[GrandAdmiral]

Just not being created. Sample from error_log

[Tue Feb 24 10:18:14.811014 2015] [core:notice] [pid 16437] AH00052: child pid 20273 exit signal Segmentation fault (11)
[Tue Feb 24 10:18:14.811096 2015] [core:notice] [pid 16437] AH00052: child pid 22189 exit signal Segmentation fault (11)
[Tue Feb 24 10:18:14.811123 2015] [core:notice] [pid 16437] AH00052: child pid 22897 exit signal Segmentation fault (11)
[Tue Feb 24 10:18:14.811146 2015] [core:notice] [pid 16437] AH00052: child pid 23622 exit signal Segmentation fault (11)

 

[JacobPerkins]

Hello,

I'd recommend opening a ticket using the links in my signature. Our support team can assist