Debugging a core dump
If a program crashes with a core dump then, it is easy to debug and find the last internal state of the program. When we run multiple programs or threads, then it is difficult to find which core was generated by which process. To resolve this, there are a few settings available in /proc, which will help us to add more detail in the core file name.
Support available from Kernel v2.4. Setting '1' to this file, will generate a core file with PID. For example: core.1234
Support available from Kernel v2.5. This file provides more control to form the core file name.
This is very similar to setting the core_uses_pid option.
echo "core.%p" > /proc/sys/kernel/core_pattern
By setting this value, core file will be generated with the following details: executable filename, PID of the dumped process and number of the signal causing the dump.
echo "core.%e.%p.%s" > /proc/sys/kernel/core_pattern
More useful options are explained in the proc man page.
This Tech Tip was brought to us by Bharathi in Chennai, India. Thanks, Bharathi!
Instant fame is easy at Linux Journal. Just send us your useful Tech Tips to share with the Linux Community, and we'll send you a cool t-shirt for your efforts!
Please note: Tech Tips featured in this specific section of LinuxJournal.com are kindly brought to us by readers and are not necessarily tested by LinuxJournal.com editors.
- Secret Agent Man
- NSA: Linux Journal is an "extremist forum" and its readers get flagged for extra surveillance
- Own Your DNS Data
- Smoothwall Express
- Returning Values from Bash Functions
- Bash Shell Script: Building a Better March Madness Bracket
- March 2017 Video Preview
- Simple Server Hardening
- From vs. to + for Microsoft and Linux
- Machine Learning Everywhere