Actually, the version of libvirt I'd upgraded from was 5.0.0-1ubuntu2.2 -> 5.0.0-1ubuntu2.3.
Downgrading all of libvirt-clients libvirt-daemon libvirt-daemon-driver-storage-rbd libvirt-daemon-system libvirt0 to 5.0.0-1ubuntu2.2 seems to have fixed this after several sleep-resume cycles, although it's hard to be sure. Does any change in libvirt seem relevant?
Actually, the version of libvirt I'd upgraded from was 5.0.0-1ubuntu2.2 -> 5.0.0-1ubuntu2.3.
Downgrading all of libvirt-clients libvirt-daemon libvirt- daemon- driver- storage- rbd libvirt- daemon- system libvirt0 to 5.0.0-1ubuntu2.2 seems to have fixed this after several sleep-resume cycles, although it's hard to be sure. Does any change in libvirt seem relevant?