Comment 3 for bug 1896751

Without the fix:
1. spawn guest on bionic
 $ uvt-kvm create --password ubuntu testguest arch=amd64 release=bionic label=daily
2. migrate it over to a focal system
 $ virsh migrate --live testguest qemu+ssh://10.102.141.223/system
3. check on focal if the guest arrived e.g. log in
 $ virsh console testguest
   testguest login: ubuntu
   Password:
4. reboot the guest
 ubuntu@testguest:~$ sudo reboot

This will hang at
         Starting Reboot...
[ 178.033556] reboot: Restarting system

Without the fix it is stuck there, I verified off PPA https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/4161 that the fix helps as expected.

I do usually test "virsh shutdown" restart cycles.
This seems to indicate it might be worth to add
a) sudo reboot cycles
b) sudo reboot cycles after migration
This might excercise quite some code paths ...