Comment 1 for bug 1893148

we just experienced the same in our production environment with ubuntu 20.04 running ussuri with the following package versions:

libvirt-clients 6.0.0-0ubuntu8.10
libvirt-daemon 6.0.0-0ubuntu8.10
libvirt-daemon-driver-qemu 6.0.0-0ubuntu8.10
libvirt-daemon-driver-storage-rbd 6.0.0-0ubuntu8.10
libvirt-daemon-system 6.0.0-0ubuntu8.10
libvirt-daemon-system-systemd 6.0.0-0ubuntu8.10
libvirt0:amd64 6.0.0-0ubuntu8.10
nova-compute-libvirt 2:21.2.0-0ubuntu1
python3-libvirt 6.1.0-1
nova-common 2:21.2.0-0ubuntu1
nova-compute 2:21.2.0-0ubuntu1
nova-compute-kvm 2:21.2.0-0ubuntu1
nova-compute-libvirt 2:21.2.0-0ubuntu1
python3-nova 2:21.2.0-0ubuntu1
python3-novaclient 2:17.0.0-0ubuntu1