Apache Coredumps with RUID2

GrandAdmiral

• February 16, 2015 04:29

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

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  kdean

  • February 18, 2015 00:17

  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:

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  GrandAdmiral

  • February 18, 2015 11:09

  ]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:

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  JacobPerkins

  • February 18, 2015 12:26

  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!

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  GrandAdmiral

  • February 19, 2015 10:22

  Thanks Jacob, I'll give that a try

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  GrandAdmiral

  • February 23, 2015 01:57

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

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  JacobPerkins

  • February 23, 2015 14:03

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

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  GrandAdmiral

  • February 24, 2015 04:15

  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)

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  JacobPerkins

  • February 24, 2015 12:37

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

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