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[Bug 1491949] Re: gate-tempest-dsvm-large-ops fails to deallocate instance network due to rpc timeout

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(9:21:42 AM) sdague: so, honestly, the thing is that we're driving an unrealistic throughput on one node there
(9:21:54 AM) sdague: because we are using fakevirt
(9:22:39 AM) sdague: I suspect starting 175 vms on one node at once is probably not a thing with an actual hypervisor :)

** Changed in: nova
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1491949

Title:
  gate-tempest-dsvm-large-ops fails to deallocate instance network due
  to rpc timeout

Status in devstack:
  In Progress
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  http://logs.openstack.org/96/219696/4/check/gate-tempest-dsvm-large-
  ops/158f061/logs/screen-n-cpu-1.txt.gz?level=TRACE

  2015-09-03 15:11:10.090 ERROR nova.compute.manager [req-ae96c425-a199-472f-a0db-e1b48147bb4c tempest-TestLargeOpsScenario-1690771764 tempest-TestLargeOpsScenario-1474206998] [instance: 195361d7-95c3-4740-825b-1acab707969e] Failed to deallocate network for instance.
  2015-09-03 15:11:11.051 ERROR nova.compute.manager [req-ae96c425-a199-472f-a0db-e1b48147bb4c tempest-TestLargeOpsScenario-1690771764 tempest-TestLargeOpsScenario-1474206998] [instance: 195361d7-95c3-4740-825b-1acab707969e] Setting instance vm_state to ERROR
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e] Traceback (most recent call last):
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 2396, in do_terminate_instance
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     self._delete_instance(context, instance, bdms, quotas)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/hooks.py", line 149, in inner
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     rv = f(*args, **kwargs)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 2375, in _delete_instance
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     quotas.rollback()
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195, in __exit__
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     six.reraise(self.type_, self.value, self.tb)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 2338, in _delete_instance
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     self._shutdown_instance(context, instance, bdms)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 2265, in _shutdown_instance
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     self._try_deallocate_network(context, instance, requested_networks)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 2194, in _try_deallocate_network
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     self._set_instance_obj_error_state(context, instance)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 195, in __exit__
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     six.reraise(self.type_, self.value, self.tb)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 2189, in _try_deallocate_network
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     self._deallocate_network(context, instance, requested_networks)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/compute/manager.py", line 1812, in _deallocate_network
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     context, instance, requested_networks=requested_networks)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/network/api.py", line 49, in wrapped
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     return func(self, context, *args, **kwargs)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/network/api.py", line 297, in deallocate_for_instance
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     requested_networks=requested_networks)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/opt/stack/new/nova/nova/network/rpcapi.py", line 175, in deallocate_for_instance
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     return cctxt.call(ctxt, 'deallocate_for_instance', **kwargs)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line 158, in call
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     retry=self.retry)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 90, in _send
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     timeout=timeout, retry=retry)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 431, in send
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     retry=retry)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 420, in _send
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     result = self._waiter.wait(msg_id, timeout)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 318, in wait
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     message = self.waiters.get(msg_id, timeout=timeout)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]   File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py", line 223, in get
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e]     'to message ID %s' % msg_id)
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e] MessagingTimeout: Timed out waiting for a reply to message ID 20d504c45f1c45e980c0194ac492d531
  2015-09-03 15:11:11.051 22635 ERROR nova.compute.manager [instance: 195361d7-95c3-4740-825b-1acab707969e] 


  I see this in the n-net logs which I think we only do if something
  else fails:

  http://logs.openstack.org/96/219696/4/check/gate-tempest-dsvm-large-
  ops/158f061/logs/screen-n-net.txt.gz#_2015-09-03_15_11_10_664

  2015-09-03 15:11:10.664 DEBUG nova.network.manager [req-ae96c425-a199
  -472f-a0db-e1b48147bb4c tempest-TestLargeOpsScenario-1690771764
  tempest-TestLargeOpsScenario-1474206998] [instance: 195361d7-95c3-4740
  -825b-1acab707969e] Explicitly disassociating fixed IP %s from
  instance. deallocate_fixed_ip
  /opt/stack/new/nova/nova/network/manager.py:1077

  https://github.com/openstack/nova/blob/master/nova/network/manager.py#L1068

                      # NOTE(yufang521247): This is probably a failed dhcp fixed
                      # ip. DHCPRELEASE packet sent to dnsmasq would not trigger
                      # dhcp-bridge to run. Thus it is better to disassociate
                      # such fixed ip here.
                      fixed_ip_ref = objects.FixedIP.get_by_address(
                          context, address)
                      if (instance_uuid == fixed_ip_ref.instance_uuid and
                              not fixed_ip_ref.leased):
                          LOG.debug('Explicitly disassociating fixed IP %s from '
                                    'instance.', instance_uuid=instance_uuid)
                          fixed_ip_ref.disassociate()

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