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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Also affects: nova/newton
   Importance: Undecided
       Status: New

** Changed in: nova/newton
   Importance: Undecided => Medium

** Changed in: nova/newton
       Status: New => In Progress

** Changed in: nova
   Importance: Undecided => Medium

** Changed in: nova/newton
     Assignee: (unassigned) => Lee Yarwood (lyarwood)

** Changed in: nova
     Assignee: Matthew Booth (mbooth-9) => Lee Yarwood (lyarwood)

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1643017

Title:
  libvirtError: block copy still active: disk 'vdb' not ready for pivot
  yet

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) newton series:
  In Progress

Bug description:
  This is an additional corner case for swap_volume not covered by
  bug#1630600.

  The following failure is taken from the devstack change enabling the
  new swap_volume tempest test :

  tempest: configure compute-feature-enabled.swap_volume if libvirt
  https://review.openstack.org/#/c/374373/

  http://logs.openstack.org/73/374373/3/check/gate-tempest-dsvm-neutron-
  full-ubuntu-
  xenial/961698c/logs/screen-n-cpu.txt.gz#_2016-11-18_16_11_39_759

  2016-11-18 16:11:39.759 4511 ERROR root [req-f40054e1-f18d-478a-
  ae14-9c738bb961f2 tempest-TestVolumeSwap-1057055027 tempest-
  TestVolumeSwap-1057055027] Original exception being dropped:
  ['Traceback (most recent call last):\n', '  File
  "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 1228, in
  _swap_volume\n    dev.abort_job(pivot=True)\n', '  File
  "/opt/stack/new/nova/nova/virt/libvirt/guest.py", line 647, in
  abort_job\n    self._guest._domain.blockJobAbort(self._disk,
  flags=flags)\n', '  File "/usr/local/lib/python2.7/dist-
  packages/eventlet/tpool.py", line 186, in doit\n    result =
  proxy_call(self._autowrap, f, *args, **kwargs)\n', '  File
  "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 144,
  in proxy_call\n    rv = execute(f, *args, **kwargs)\n', '  File
  "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 125,
  in execute\n    six.reraise(c, e, tb)\n', '  File
  "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 83,
  in tworker\n    rv = meth(*args, **kwargs)\n', '  File
  "/usr/local/lib/python2.7/dist-packages/libvirt.py", line 739, in
  blockJobAbort\n    if ret == -1: raise libvirtError
  (\'virDomainBlockJobAbort() failed\', dom=self)\n', "libvirtError:
  block copy still active: disk 'vdb' not ready for pivot yet\n"]

  As discussed in bug#1630600 and at length in RHBZ#1382165 the issue
  here is that QEMU reports the progress of the block job as complete
  (status.cur == status.end) _before_ updating the ready field of the
  block job. This causes the following attempt to pivot to fail.

  Nova should attempt to use the ready field of the block job when
  available (libvirt >1.2.18) to ensure that we are able to pivot.

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