Snapshot delete fails. Libvirt job terminated.

Issue

• Unable to delete VM snapshot.
• VM now has illegal image.

# source /etc/ovirt-engine/engine.conf.d/10-setup-database.conf; /usr/share/ovirt-engine/setup/dbutils/unlock_entity.sh -q -t all -c

Locked VMs

 vm_name | snapshot_id
---------+-------------

Locked templates

 template_name | disk_id
---------------+---------

Locked disks

 vm_id | disk_id
-------+---------

Locked snapshots

 vm_id | snapshot_id
-------+-------------


Illegal images

   vm_name    |              image_guid
--------------+--------------------------------------
 TEST_VM      | d36ddda0-bcdd-40f5-9afc-30098919c19e