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

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

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https://bugs.launchpad.net/bugs/1248799

Title:
  vm would be stuck in unshelving when unshelve fails

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  when unshelve a vm, if this vm has been offloaded, the process would involve re-scheduling.
  in nova/conductor/manager.py def  unshelve_instance(self, context, instance):

  elif instance.vm_state == vm_states.SHELVED_OFFLOADED:
              try:
                  with compute_utils.EventReporter(context, self.db,
                          'get_image_info', instance.uuid):
                      image = self._get_image(context,
                              sys_meta['shelved_image_id'])
              except exception.ImageNotFound:
                  with excutils.save_and_reraise_exception():
                      LOG.error(_('Unshelve attempted but vm_state not SHELVED '
                                  'or SHELVED_OFFLOADED'), instance=instance)
                      instance.vm_state = vm_states.ERROR
                      instance.save()

              filter_properties = {}
              hosts = self._schedule_instances(context, image,
                                               filter_properties,instance)           <<<<<this re-scheduling would cause exception,when it occurs,the 
           <<<<<<instance will be stuck in task_state: unshelving forever
              host = hosts.pop(0)['host']
              self.compute_rpcapi.unshelve_instance(context, instance, host,
                      image)

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