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[Launchpad Bug Tracker <1562042@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package heat - 1:6.0.0-0ubuntu1.1

---------------
heat (1:6.0.0-0ubuntu1.1) xenial; urgency=medium

  * d/p/engine-shutdown.patch: Cherry pick fix to ensure that heat-engine
    worker processes are shutdown correctly when SIGINT is received early
    in the process lifecycle (LP: #1562042).

 -- James Page <james.page@xxxxxxxxxx>  Tue, 10 May 2016 12:40:54 +0100

** Changed in: heat (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1562042

Title:
  Traceback in error log during heat-engine service shutdown

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive liberty series:
  Fix Committed
Status in Ubuntu Cloud Archive mitaka series:
  Fix Committed
Status in heat:
  Fix Released
Status in heat package in Ubuntu:
  Fix Released
Status in heat source package in Wily:
  Fix Released
Status in heat source package in Xenial:
  Fix Released
Status in heat source package in Yakkety:
  Fix Released

Bug description:
  During shutdown of heat-engine service this traceback could be observed in log:
  ```
  2016-03-25 17:29:22.259 22588 DEBUG oslo_service.service [-] Stop services. stop /usr/lib/python2.7/dist-packages/oslo_service/service.py:583
  2016-03-25 17:29:22.261 22588 DEBUG heat.engine.service [-] Attempting to stop engine service... _stop_rpc_server /usr/lib/python2.7/dist-packages/heat/engine/service.py:410
  2016-03-25 17:29:22.262 22588 ERROR heat.engine.service [-] Failed to stop engine service, 'NoneType' object has no attribute 'stop'
  2016-03-25 17:29:22.264 22588 CRITICAL heat-engine [-] AttributeError: 'NoneType' object has no attribute 'groups'
  2016-03-25 17:29:22.264 22588 ERROR heat-engine Traceback (most recent call last):
  2016-03-25 17:29:22.264 22588 ERROR heat-engine   File "/usr/bin/heat-engine", line 10, in <module>
  2016-03-25 17:29:22.264 22588 ERROR heat-engine     sys.exit(main())
  2016-03-25 17:29:22.264 22588 ERROR heat-engine   File "/usr/lib/python2.7/dist-packages/heat/cmd/engine.py", line 79, in main
  2016-03-25 17:29:22.264 22588 ERROR heat-engine     launcher.wait()
  2016-03-25 17:29:22.264 22588 ERROR heat-engine   File "/usr/lib/python2.7/dist-packages/oslo_service/service.py", line 577, in wait
  2016-03-25 17:29:22.264 22588 ERROR heat-engine     self.stop()
  2016-03-25 17:29:22.264 22588 ERROR heat-engine   File "/usr/lib/python2.7/dist-packages/oslo_service/service.py", line 586, in stop
  2016-03-25 17:29:22.264 22588 ERROR heat-engine     service.stop()
  2016-03-25 17:29:22.264 22588 ERROR heat-engine   File "/usr/lib/python2.7/dist-packages/osprofiler/profiler.py", line 117, in wrapper
  2016-03-25 17:29:22.264 22588 ERROR heat-engine     return f(*args, **kwargs)
  2016-03-25 17:29:22.264 22588 ERROR heat-engine   File "/usr/lib/python2.7/dist-packages/heat/engine/service.py", line 426, in stop
  2016-03-25 17:29:22.264 22588 ERROR heat-engine     for stack_id in list(self.thread_group_mgr.groups.keys()):
  2016-03-25 17:29:22.264 22588 ERROR heat-engine AttributeError: 'NoneType' object has no attribute 'groups'
  2016-03-25 17:29:22.264 22588 ERROR heat-engine 
  2016-03-25 17:29:22.388 22599 INFO oslo_service.service [-] Parent process has died unexpectedly, exiting
  ```

  Full log could be found here:
  http://pastebin.com/raw/mgRbgvjd

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