'dd' to a virtio-scsi direct lun with scsi-passthtough enabled causes RHV VM to pause

Solution Unverified - Updated -

Issue

  • When 'dd' with a specific block size and count is issued to write to a file inside a guest, and the guest's disk is a direct lun that is configured as virtio-scsi with scsi-passthrough enabled, the VM pauses every time.

Environment

  • Red Hat Virtualization (RHV) 4.2
  • Red Hat Enterprise Linux (RHEL) 7.6
    • qemu-kvm-rhev-2.12.0-18.el7_6.3

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