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.