Live merge (snapshot deletion) hangs with VDSM reporting "cleanup thread failed" and "There is no leaf" repetitively.

Solution In Progress - Updated -

Issue

  • Live merge (snapshot deletion) hangs, loops forever.

  • The engine is waiting on child commands to complete.

  • VDSM reports "cleanup thread failed" and "There is no leaf" repetitively.

  • The snapshot remains in a "LOCKED" state.

Environment

  • Red Hat Virtualization (RHV) 4.3.5
  • Red Hat Enterprise Linux (RHEL) 7.6 host;
    • vdsm-4.30.13-1.el7ev.x86_64
    • libvirt-4.5.0-10.el7_6.7.x86_64
    • qemu-kvm-rhev-2.12.0-18.el7_6.4.x86_64

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