[ceph-users] rbd snap create now working and just hangs forever

Hi, I have a customer VM that is running fine, but I can not make snapshots anymore. rbd snap create rbd/IMAGE@test-bb-1 just hangs forever. When I checked the status with rbd status rbd/IMAGE it shows one watcher, the cpu node where the VM is running. What can I do to investigate further, without restarting the VM. This is the only affected VM and it stopped working three days ago.