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[Vladislav Belogrudov <vladislav.belogrudov@xxxxxxxxxx>]

Public bug reported:

queens release,

running instance from ceph volume, in horizon: 'migrate'

Instance is in ERROR state. Horizon reports:

Error: Failed to perform requested operation on instance "instance3", the
instance has an error status: Please try again later [Error: list index out
of range].

yet another instance got:

Error: Failed to perform requested operation on instance "instance4", the
instance has an error status: Please try again later [Error: Conflict
updating instance 6b837382-2a75-46a6-9a09-8c3f90f0ffd7. Expected:
{'task_state': [u'resize_prep']}. Actual: {'task_state': None}].

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1777157

Title:
  cold migration fails for ceph volume instances

Status in OpenStack Compute (nova):
  New

Bug description:
  queens release,

  running instance from ceph volume, in horizon: 'migrate'

  Instance is in ERROR state. Horizon reports:

  Error: Failed to perform requested operation on instance "instance3", the
  instance has an error status: Please try again later [Error: list index out
  of range].

  yet another instance got:

  Error: Failed to perform requested operation on instance "instance4", the
  instance has an error status: Please try again later [Error: Conflict
  updating instance 6b837382-2a75-46a6-9a09-8c3f90f0ffd7. Expected:
  {'task_state': [u'resize_prep']}. Actual: {'task_state': None}].

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