We will need some more logs, please let me ask for:
"hard crash on the host" is the host kernel crashing and the whole system goes 
down?
-  If yes, then is there a way to get the log that contains the kernel crash?
-  If no then I'd assume you mean that the associated qemu process dies right 
(more likely)?
   In that case please provide:
   a) /var/log/libvirt/qemu/<guestname>.log
   b) if you get a crash in /var/crash/ of the qemu process either direct or 
via apport [1]

To silence apparmor in this you might consider removing the second disk
"/home/brian/.seconddrive/windowsVM.img" from the guest definition just
to see if it has any effect to the issue.

Given the issue it is unlikely to find something interesting in
libvirt's log, but since I need to reach out to you for logs anyway let
us be complete. No need to enable extra debugging output, but a snippet
of `journalctl -u libvirtd` from when the guest was started until it
crashed woulc be nice as well.

How is your guest definition looking, since you assume it is network
related which network definition do you use - best would be to attach
the full output of `virsh dumpxml <guestname>` here at the bug as it
would help to reproduce the issue.

Finally how did you setup networking in the guest, any special drivers for 
virtio installed?
Or just windows as-is, if so which windows version btw?


I have no other windows than Win98 around and that doesn't fail :-)
I'm asking around for one. But there would be one more great thing, if you 
could test that it triggers on a fresh install from an ISO [2] as well then 
everyone even without a license could give it a debug try. So if you - knowing 
to be affected - could check and confirm that it would be great.


[1]: http://manpages.ubuntu.com/manpages/eoan/man1/apport-bug.1.html
[2]: https://www.microsoft.com/en-gb/software-download/windows10ISO

** Changed in: qemu (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1849720

Title:
  Running VM with Virtual NIC Crashes Host OS

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