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[Mathew Hodson <mathew.hodson@xxxxxxxxx>]

** No longer affects: libvirt (Ubuntu Xenial)

** No longer affects: libvirt (Ubuntu Yakkety)

** No longer affects: libvirt (Ubuntu Zesty)

** Changed in: libvirt (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1317491

Title:
  virsh blockcommit hangs at 100%

Status in libvirt package in Ubuntu:
  Fix Released
Status in libvirt source package in Trusty:
  Fix Committed

Bug description:
  [Impact]

   * Virsh can't merge snapshots using the Block Commit technique
   * It is only possible to merge base to top image (not the opposite)
   * Combination of libvirt v1.2.2 and QEMU 2 is no good for Block Commit
   * After this fix, virsh won't hang on the opration, will cause an error

  [Test Case]

  $ virsh list --all
   Id    Name                           State
  ----------------------------------------------------
   4     guest                          running

  $ virsh domblklist --domain guest
  Target     Source
  ------------------------------------------------
  vda        /var/lib/libvirt/images/guest.1487880011

  $ sudo qemu-img info --backing-chain /var/lib/libvirt/images/guest.1487880011 | grep image:
  image: /var/lib/libvirt/images/guest.1487880011
  image: /var/lib/libvirt/images/guest.qcow2

  inaddy@(kvm02):~$ virsh blockcommit --domain=guest --path=/var/lib/libvirt/images/guest.1487880011 --base=/var/lib/libvirt/images/guest.qcow2 --wait --verbose
  Block Commit: [100 %] <----- STUCKS HERE

  [Regression Potential]

   * Block commit for Active layers would continue not working
   * Block commit for Intermediary layers would not work
   * Its a small fix based on upstream fix (to block this function)
   * Has been tested a lost on verification

  [Other Info]

  ## Original Case Description

  virsh blockcommit hangs at 100% and nothing happens.

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