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I am trying to debug a broken application that renders X11 windows. I am running CentOS 8.1.

I have followed the instructions per Redhat on enabling core dumps.

  1. I have enabled DefaultLimitCORE=infinity in /etc/systemd/system.conf
  2. I rebooted the machine
  3. I set ulimit -c unlimited

When I try to run my application :

$ /usr/local/some/broken_executable
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-aps003'
MESA-LOADER: failed to open swrast (search paths /usr/lib64/dri)
libGL error: failed to load driver: swrast
Aborted (core dumped)

I don't see the core file generated either in the current working directory or in my home directory. I also tried uncommenting the #DumpCore=yes line in /etc/systemd/system.conf and rebooting the machine.

Question

  1. What am I missing here? I just want to be able to generate core files for debugging purposes.

1 Answer 1

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Your core dumps are probably in /var/lib/systemd/coredump (unless you've changed your systemd configuration to put them somewhere else). Use coredumpctl list to see what core dumps are available, and coredumpctl dump to extract them. See more info about coredumpctl

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