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[sahid <sferdjao@xxxxxxxxxx>]

Public bug reported:

When trying to boot a new instance at a compute-node, where nova-compute
received SIGHUP(the SIGHUP is used as a trigger for reloading mutable
options), it always failed.

  ========== nova/compute/manager.py ==============
    def cancel_all_events(self):
        if self._events is None:
            LOG.debug('Unexpected attempt to cancel events during shutdown.')
            return
        our_events = self._events
        # NOTE(danms): Block new events
        self._events = None                    <--- Set self._events to "None" 
    ...
    =================================================

  This will cause a NovaException when prepare_for_instance_event() was called.
  It's the cause of the failure of network allocation.

    ========== nova/compute/manager.py ==============
    def prepare_for_instance_event(self, instance, event_name):
        ...
        if self._events is None:
            # NOTE(danms): We really should have a more specific error
            # here, but this is what we use for our default error case
            raise exception.NovaException('In shutdown, no new events '
                                          'can be scheduled')
    =================================================

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1715374

Title:
  Reloading compute with SIGHUP prenvents instances to boot

Status in OpenStack Compute (nova):
  New

Bug description:
  When trying to boot a new instance at a compute-node, where nova-
  compute received SIGHUP(the SIGHUP is used as a trigger for reloading
  mutable options), it always failed.

    ========== nova/compute/manager.py ==============
      def cancel_all_events(self):
          if self._events is None:
              LOG.debug('Unexpected attempt to cancel events during shutdown.')
              return
          our_events = self._events
          # NOTE(danms): Block new events
          self._events = None                    <--- Set self._events to "None" 
      ...
      =================================================

    This will cause a NovaException when prepare_for_instance_event() was called.
    It's the cause of the failure of network allocation.

      ========== nova/compute/manager.py ==============
      def prepare_for_instance_event(self, instance, event_name):
          ...
          if self._events is None:
              # NOTE(danms): We really should have a more specific error
              # here, but this is what we use for our default error case
              raise exception.NovaException('In shutdown, no new events '
                                            'can be scheduled')
      =================================================

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