Comment 17 for bug 1825882

I have verified the following versions:

* bionic: 17.0.9-0ubuntu3
* cosmic: 18.1.0-0ubuntu3
* disco: 19.0.0-0ubuntu2.3

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.