Comment # 10 on bug 1078548 from Charles Arnold

(In reply to Neil Rickert from comment #9)
> Responding to c#8
> 
> Interesting question.  I will have to repeat the upgrade attempt to test
> that.
> 
> Here's what I'm tentatively thinking I will do:
> 
> (1) delete the VM from my prior upgrade attempt (to reclaim disk space)
> (2) clone the same 42.3 VM as before
> (3) upgrade as before
> (4) if I see it freeze, I'll pause the VM, and then close virt-manager
> (5) restart virt-manager, run that VM, unpause, and see whether the display
> is still frozen
> 
> Does that sound like an appropriate way of testing?

You shouldn't have to pause the VM. Shutting down virt-manager should not
effect the VM. It will keep running while you reattach with either
virt-manager or virt-viewer.