qemu crashes when doing a snapshot live merge

Solution Unverified - Updated -

Issue

When doing a live snapshot merge, the qemu process fails with the error below and the merge fails, leaving some images in ILLEGAL status.

qemu-kvm: block/io.c:1372: bdrv_aligned_pwritev: Assertion `child->perm & BLK_PERM_WRITE' failed.

Environment

  • Red Hat Virtualization (RHV) 4.2
  • Red Hat Virtualization Host (RHVH) 4.2.5.0-0.20180724.0
    • qemu-kvm-rhev-2.10.0-21.el7_5.4.x86_64
    • kernel-3.10.0-862.9.1.el7.x86_64
    • libvirt-3.9.0-14.el7_5.6.x86_64

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