Comment 21 for bug 1825882

OK, verified S/Q/R as commented on https://bugs.launchpad.net/bugs/1826523

The following exception is raised when the traffic to the ceph-mon is dropped by
iptables.

** libvirt.libvirtError: Timed out during operation: cannot acquire state change lock (held by remoteDispatchDomainAttachDeviceFlags)
** No attachment has been found at the vms after this operation fails, no volume added to
volumes_attached property. (https://pastebin.canonical.com/p/kkmRcfrsjT/)