What is a Core Dump?

When you have a process running in System Memory and it does not finish, the portion of memory that the process was using is dumped to a file for further reivew. This is helpful for debugging your scripts. Core dumps usually have a file name that looks similar to:
core.5744

How can I review a Core Dump?

For the average user (and even the advanced user), getting information out of a core dump can be difficult. Most of the information contained in core dumps can be found with either of the two commands:

gdb -c core.####
strings core.####

These commands above need to be ran from the command line, however most shared hosting (including Web Hosting Hub) does not allow command line access for security reasons. We've created a simple php script that allows you to find core dumps and use the commands above to review their contents. The script can be found here:
http://www.webhostinghub.com/support/files/scripts/coredumpcheck.txt

To use the coredumpcheck script:

  1. Upload the coredumpcheck.txt file to the folder where you have core dumps
  2. Rename coredumpcheck.txt to coredumpcheck.php
  3. Access coredumpcheck.php in your browser. For example if you have a folder named "test" with core dumps and you uploaded the coredumpcheck.txt file there, access http://YourDomain.com/test/coredumpcheck.php
  4. The script will list all core dumps in the current directory. Click any of the core dumps to view more details about the dump.

Look under the "RUNNING: gdb -c core.30387" heading to find the script that is causing the problem. It will be in a line that looks similar to:

Core was generated by `/usr/bin/php /home/training/public_html/t2c_escalation/escalatet2s.php'.


We've highlighted the correct line in the screenshot below.

 

core_dump

How can I resolve a Core Dump?

Core Dumps in nature are an advanced topic. It is best to contact your website developer with the information that you have obtained using the coredumpcheck.php file.

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