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[sean mooney <smooney@xxxxxxxxxx>]

as of https://github.com/openstack/nova/commit/73f1fda7e93325d3ca2b2c62afb17fe011d650f3
this is now fix in nova 20.0.0.0rc1

the osls.service issue was fixed in release 1.40.1

** Changed in: nova
       Status: In Progress => Fix Released

** Changed in: oslo.service
       Status: In Progress => Fix Released

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

Title:
  Reloading compute with SIGHUP prevents instances from booting

Status in OpenStack Compute (nova):
  Fix Released
Status in openstack-ansible:
  Confirmed
Status in oslo.service:
  Fix Released
Status in tripleo:
  Won't Fix

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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