Instance evacuation fails with qemu error ' Failed to get "write" lock Is another process using the image? '

Solution In Progress - Updated -

Issue

  • Instance evacuation fails for InstanceHA compute nodes with NFS backend.
  • Failures are noticed for both nova and cinder with NFS backend.
  • An excerpt of the error message logged in nova-compute logs.

    2019-09-03 13:47:17.788 1 ERROR oslo_messaging.obfuscateduser22.server 2019-09-03T13:47:16.086331Z obfuscateduser28-kvm: -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on: Failed to get "write" lock
    2019-09-03 13:47:17.788 1 ERROR oslo_messaging.obfuscateduser22.server Is another process using the image?
    

Environment

  • Red Hat OpenStack Platform 13
  • InstanceHA Compute Nodes
  • NFSv4 and above as backend for nova and cinder.

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