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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => kilo-2

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https://bugs.launchpad.net/bugs/1397153

Title:
  instance stuck at migrating state when some unexpected error happened

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  As the code in conductor:

          try:
              live_migrate.execute(context, instance, destination,
                               block_migration, disk_over_commit)
          except (exception.NoValidHost,
                  exception.ComputeServiceUnavailable,
                  exception.InvalidHypervisorType,
                  ....) as ex:
              with excutils.save_and_reraise_exception():
                  # TODO(johngarbutt) - eventually need instance actions here
                  request_spec = {'instance_properties': {
                      'uuid': instance['uuid'], },
                  }
                  scheduler_utils.set_vm_state_and_notify(context,
                          'compute_task', 'migrate_server',
                          dict(vm_state=instance['vm_state'],
                               task_state=None,
                               expected_task_state=task_states.MIGRATING,),
                          ex, request_spec, self.db)
          except Exception as ex:
              LOG.error(_LE('Migration of instance %(instance_id)s to host'
                            ' %(dest)s unexpectedly failed.'),
                        {'instance_id': instance['uuid'], 'dest': destination},
                        exc_info=True)
              raise exception.MigrationError(reason=six.text_type(ex))

  
  When there is any unexpected exception raised from 'live_migrate.execute', the code will raise MigrationError, then the instance stuck at vm_state:active task_state: migrating and return 400 to user. This is confuse for user.

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