RHV: Virtual Machines fail to start and migrate with "Failed to lock byte 100"

Solution Verified - Updated -


  • After upgrade to RHEL 7.5 Hosts/Hypervisors, no Virtual Machines can be started or migrated to the new hosts.


  • Red Hat Virtualization 4.1, 4.2
  • Red Hat Enterprise Linux 7.5 and higher
    • kernel-3.10.0-862
    • qemu-kvm-rhev-2.10
  • NFS Storage Domain
    • NFSv4 hosted on Windows 2012 R2 Server

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