LVM2 snapshot cannot be removed after attempting to merge an invalid snapshot in RHEL 6

Solution Unverified - Updated -

Issue

  • If a snapshot becomes invalidated, and then a merge of that snapshot is attempted, the logical volume is no longer listed in lvs output but the extents are still shown as in use. 
  • After merging an invalid snapshot, I cannot remove the snapshot
  • After merging an invalid snapshot, I cannot create another snapshot

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • lvm2 prior to release 2.02.95-10.el6 and/or device-mapper prior to release 1.02.74-10.el6

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