Unable to delete cinder snapshot

Issue

• Deleting cinder snapshot throw below error in cinder log file

var/log/cinder/./volume.log:36825:2017-02-24 20:06:29.024 35204 ERROR cinder.volume.manager [req-966972c0-8b09-4533-8ddd-b89eb88dd5b1 admin 0e66124e1f8e448a8fdc4ca336bed17a - - -] Cannot delete snapshot 498c601f-5c09-4ead-815c-59109e1c1577: snapshot is busy

var/log/cinder/./api.log:35320:2017-02-28 10:57:01.766 34911 ERROR cinder.volume.api [req-bd258594-39d5-4c23-931a-2acb4adbc87f admin 0e66124e1f8e448a8fdc4ca336bed17a - - -] Unable to delete snapshot: 498c601f-5c09-4ead-815c-59109e1c1577, due to invalid status. Status must be available or error, not deleting.

var/log/cinder/./volume.log:44776:2017-02-28 12:09:54.448 35204 ERROR oslo_messaging.rpc.dispatcher [req-269725f2-174f-4ee5-a525-835ada87bd61 admin 0e66124e1f8e448a8fdc4ca336bed17a - - -] Exception during message handling: error unprotecting snapshot volume-4c257232-b466-41e0-97ea-7c3e8f6346be@snapshot-498c601f-5c09-4ead-815c-59109e1c1577
var/log/cinder/./volume.log:44800:2017-02-28 12:09:54.448 35204 TRACE oslo_messaging.rpc.dispatcher ImageNotFound: error unprotecting snapshot volume-4c257232-b466-41e0-97ea-7c3e8f6346be@snapshot-498c601f-5c09-4ead-815c-59109e1c1577

• The actual snapshot gets deleted from Ceph storage backend, however only the snapshot present in cinder database.