Can't capture vmcore?

[Maxim Burgerhout <maxim@xxxxxxxxx>]

I'm getting kernel panics in a VM that functions as a hypervisor, the moment I spin up the nested guest (on AMD ThreadRipper / Fedora 27). That is annoying, of course, so I try to be a good citizen and file a bug.

For some reason though, I cannot get the core dumped. I get a core fine with sysrq, but not with this actual panic. I've followed [1] to set up kdump and crash, but everytime I trigger the crash and see my VM reboot, I see an empty /var/crash afterwards.

As was able to get the vmcore written to /var/crash on in a RHEL7 guest, I'm starting to suspect a bug, but I'm unsure.

Any pointers on how to debug this?

[1] https://fedoraproject.org/wiki/How_to_use_kdump_to_debug_kernel_crashes

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