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[Xuanzhou Perry Dong <oss_xzdong@xxxxxxx>]

Already fixed by: https://review.openstack.org/284287

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

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https://bugs.launchpad.net/bugs/1526734

Title:
  Restart of nova-compute service fails

Status in OpenStack Compute (nova):
  Fix Released
Status in oslo.service:
  Incomplete

Bug description:
  After sending HUP signal to nova-compute process we can observe trace
  in logs:

  2015-11-30 10:35:26.509 INFO oslo_service.service [req-ecb7f866-b041-4abb-9037-164443b8387f None None] Caught SIGHUP, exiting
  2015-11-30 10:35:31.894 DEBUG oslo_concurrency.lockutils [req-ecb7f866-b041-4abb-9037-164443b8387f None None] Acquired semaphore "singleton_lock" from (pid=24742) lock /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:212
  2015-11-30 10:35:31.900 DEBUG oslo_concurrency.lockutils [req-ecb7f866-b041-4abb-9037-164443b8387f None None] Releasing semaphore "singleton_lock" from (pid=24742) lock /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:225
  2015-11-30 10:35:31.903 ERROR nova.service [req-ecb7f866-b041-4abb-9037-164443b8387f None None] Service error occurred during cleanup_host
  2015-11-30 10:35:31.903 TRACE nova.service Traceback (most recent call last):
  2015-11-30 10:35:31.903 TRACE nova.service   File "/opt/stack/nova/nova/service.py", line 312, in stop
  2015-11-30 10:35:31.903 TRACE nova.service     self.manager.cleanup_host()
  2015-11-30 10:35:31.903 TRACE nova.service   File "/opt/stack/nova/nova/compute/manager.py", line 1323, in cleanup_host
  2015-11-30 10:35:31.903 TRACE nova.service     self.instance_events.cancel_all_events()
  2015-11-30 10:35:31.903 TRACE nova.service   File "/opt/stack/nova/nova/compute/manager.py", line 578, in cancel_all_events
  2015-11-30 10:35:31.903 TRACE nova.service     for instance_uuid, events in our_events.items():
  2015-11-30 10:35:31.903 TRACE nova.service AttributeError: 'NoneType' object has no attribute 'items'
  2015-11-30 10:35:31.903 TRACE nova.service

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