Block commit job never completes after snapshot deletion fails in RHV 4.2 - Red Hat Customer Portal

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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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