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After installing kdump-related packages and yet another hang, I now have a:

/var/crash/kexec_cmd

file. But what can I do with it? Should I use the command-line crash utility? I tried to, but it wanted my kernel file and didn't accept /vmlinuz. Is there other something else I can/should use?

  • I have the exact same issue. Were you able to find a solution? – psy Apr 3 '18 at 13:34
  • No, I wasn't, and now my hardware and software has changed... – einpoklum Aug 26 '18 at 19:06
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You can use the GNU debugger, GDB. See this older post for more info.

  • No, you're wrong: "/var/crash/kexec_cmd" is not a core dump: File format not recognized. – einpoklum Oct 1 '17 at 7:45

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