> Sorry about the confusion.

Never mind, now things are clear - thanks!

> 1- update libvirt
> 2- virst list (I see running vms)
> 3- try to stop the vm with nova, "openstack server stop uuid"
> 4- virsh list. (now it hangs)
>

I'd need insight from the OpenStack Team on this how nova might interfere here.
This is out of my area of expertise now - but UCA Team is already
subscribed so that should be ok.

>
> anyhow, how does a reload of those process could even work ?
> If the PID is kept the same it's defenitely not the "new version" that is 
> running.
> I think it would be better to restart the services instead of only reloading 
> them.

This is intentional and ok.
If you'd fully restart the service it would loose some of the logs.
Instead see [1] in section "signals" virtlogd is designed to reload
itself via exeve.
This is how it is same-pid but new code while maitaining open logs.

[1]: http://manpages.ubuntu.com/manpages/bionic/en/man8/virtlogd.8.html

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https://bugs.launchpad.net/bugs/1583009

Title:
  Error starting domain since update

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