How to recover from detaching state and detach cinder volume from instance when stuck ?

Solution Verified - Updated -

Issue

  • Shutdown instance with nova stop then tried to detach volume with nova volume-detach.
  • After detaching a volume it remains in detaching state for 3 hours.
  • How to recover from detaching state and detach cinder volume from instance ?

Environment

  • Red Hat Enterprise Linux OpenStack Platform 6 (RHEL OSP)

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