Created attachment 852890 [details]
Screenshot of the guest VM guest's VNC screen

I have started observing an issue with virtualized hosts in openstack running
the Leap 15.3 kernel (5.3.18): guests with the Leap 15.4 or Tumbleweed kernel
fail to boot. I was only able to capture a screenshot of the VNC output of the
guest VM (see attachment) and I was told that this means:

RAX is holding -ENOSYS, so probably something is not supported (user-mode
x86_64 kernel trying to do a mincore syscall, which seems to return -ENOSYS)

Updating the host VM to a Leap 15.4 kernel makes the issue go away, but that is
not really a good solution.

This issue only appears on openstack. I have tried to reproduce it with
ordinary virtual machines with qemu and there everything worked. Virtualbox is
also not impacted and neither are bare metal hosts.