I have enabled a unlimited core file size using ulimit:

ulimit -a
core file size          (blocks, -c) unlimited

I believe I have triggered a core dump but I can't locate the core file in my home, var/... etc...

Do you know where Ubuntu configures the core dump location?

  • @djf the OP didn't specify what program was causing core dumps. It may not be programmers code. It may be Unity for all we know. Jan 26 '15 at 23:48
  • 1
    How is this a SuperUser question? This is about running a debugger which only programmers use. This should be migrated back to SO.
    – Homer6
    Mar 1 '18 at 5:04

I think this is a more Linux kernel thing than a specific Ubuntu thing. Check out

cat /proc/sys/kernel/core_pattern

Check out the core file man page

  • 13
    That does not tell you where it puts the file. The question named Ubuntu 14.04. It is not clear at all by following the command in /proc/sys/kernel/core_pattern where one would find the file.
    – jcalfee314
    Feb 20 '15 at 1:49
  • 1
    For me, that core_pattern kernel pseudofile references a program called 'apport'... which has no man page nor much helpful output. So still searching for my dumped cores. :(
    – gojomo
    Jun 9 '15 at 14:34
  • 1
    apport is the standard linux desktop core handler it reports back to your distro usually.
    – kkron
    Sep 9 '15 at 2:16
  • How to open this folder? cd /usr/share/apport/apport don't work.
    – mrgloom
    Feb 9 '16 at 20:04

By default, the Ubuntu kernel is configured to use apport to log coredumps. You can override this by overwriting /proc/sys/kernel/core_pattern, check the "Naming of core dump files" section in man core for details. For example:

echo '/tmp/core.%e.%p.%t' | sudo tee /proc/sys/kernel/core_pattern

Apport writes core dumps to /var/crash/_path_to_program.userid.crash, BUT it will only do so for applications installed from the main ubuntu apt repositories.

More info on apport: https://wiki.ubuntu.com/Apport

  • 1
    To write core dumps for non-package programs as well, create a file named ~/.config/apport/settings with the following contents: [main] unpackaged=true
    – greuze
    Oct 31 '18 at 9:01
  • Modifying the /proc/sys/kernel/core_pattern does not work for me in Ubuntu 18.04
    – greuze
    Oct 31 '18 at 9:03

On Ubuntu 16.04.3 LTS, my core dump was located at:


So, to run it in gdb, you can run:

apt install gdb gdb /path/to/your/binary/application-name /var/lib/systemd/coredump/core.application-name.0.24d47e89526c4c7e90953998d2c33d1e.19672.1516049424000000000000

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.