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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1768927

Title:
  Unable to hard reboot an instance that is pausing

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) pike series:
  New
Status in OpenStack Compute (nova) queens series:
  New

Bug description:
  If you look at the allowed task_states for hard reboot in the API
  here:

  https://github.com/openstack/nova/blob/644ac5ec37903b0a08891cc403c8b3b63fc2a91c/nova/compute/api.py#L2963

  it allows these values:

  https://github.com/openstack/nova/blob/644ac5ec37903b0a08891cc403c8b3b63fc2a91c/nova/compute/task_states.py#L120

  ALLOW_REBOOT = [None, REBOOTING, REBOOT_PENDING, REBOOT_STARTED, RESUMING,
                  REBOOTING_HARD, UNPAUSING, PAUSING, SUSPENDING]

  But when changing the task_state on the instance, if it's currently
  'pausing' it will fail because that's not one of the
  expected_task_states:

  https://github.com/openstack/nova/blob/644ac5ec37903b0a08891cc403c8b3b63fc2a91c/nova/compute/api.py#L2966

          expected_task_state = [None,
                                 task_states.REBOOTING,
                                 task_states.REBOOT_PENDING,
                                 task_states.REBOOT_STARTED,
                                 task_states.REBOOTING_HARD,
                                 task_states.RESUMING,
                                 task_states.UNPAUSING,
                                 task_states.SUSPENDING]
          instance.save(expected_task_state = expected_task_state)

  It looks like this is just a very old latent problem, see:
  https://review.openstack.org/#/c/127427/

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