Block commit job never completes after snapshot deletion fails in RHV 4.2

Solution Verified - Updated -

Issue

  • Snapshot deletion (Live Merge) failed.
  • Block commit never completed
  • iothreads enabled
  • Virsh blockjob stuck in 99% after removing snapshot in VM with iothread enabled
virsh -r blockjob VM_NAME sda
Active Block Commit: [ 99 %]

Environment

  • Red Hat Virtualization (RHV) 4.2
    • rhvm-4.2.6.4-0.1.el7ev.noarch
  • Red Hat Virtualization Hypervisor (RHVH) 4.2
    • vdsm-4.20.39.1-1.el7ev.x86_64
    • qemu-kvm-rhev-2.10.0-21.el7_5.4.x86_64
    • libvirt-3.9.0-14.el7_5.7.x86_64

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