NFS share fails to unmount with error "not found" or "not mounted"

Solution Verified - Updated -

Issue

  • NFS share fails to unmount with error message not found or not mounted.
# umount /mnt/testdir
umount.nfs4: /mnt/testdir: not found

Environment

  • Red Hat Enterprise Linux (All versions)
  • NFSv3
  • NFSv4

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