How to generate a core dump in Linux on a segmentation fault?

Question

I have a process in Linux that\'s getting a segmentation fault. How can I tell it to generate a core dump when it fails?

Answer 1

Ubuntu 19.04

All other answers themselves didn't help me. But the following sum up did the job

Create ~/.config/apport/settings with the following content:

[main]
unpackaged=true

(This tells apport to also write core dumps for custom apps)

check: ulimit -c. If it outputs 0, fix it with

ulimit -c unlimited

Just for in case restart apport:

sudo systemctl restart apport

Crash files are now written in /var/crash/. But you cannot use them with gdb. To use them with gdb, use

apport-unpack  

Further information:

• Some answers suggest changing core_pattern. Be aware, that that file might get overwritten by the apport service on restarting.
• Simply stopping apport did not do the job
• The ulimit -c value might get changed automatically while you're trying other answers of the web. Be sure to check it regularly during setting up your core dump creation.

References:

• https://stackoverflow.com/a/47481884/6702598