magnum-conductor throws exception on "Possible Hang"

[Surojit Pathak]

I see magnum-conductor throwing the exception periodically -
2016-01-05 18:35:59.242 DEBUG magnum.service.periodic [req-604c7992-c6f5-4fc1-9487-a2f31fc6b9cd None None] Starting to sync up bay status from (pid=8048) sync_bay_status /opt/s
tack/magnum/magnum/service/periodic.py:71
2016-01-05 18:36:28.215 WARNING oslo_messaging.server [-] Possible hang: wait is waiting for stop to complete
2016-01-05 18:36:28.217 DEBUG oslo_messaging.server [-] File "/usr/bin/magnum-conductor", line 10, in <module>
    sys.exit(main())
  File "/opt/stack/magnum/magnum/cmd/conductor.py", line 78, in main
    launcher.wait()
  File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 284, in wait
    status, signo = self._wait_for_exit_or_signal(ready_callback)
  File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 262, in _wait_for_exit_or_signal
    super(ServiceLauncher, self).wait()
  File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 207, in wait
    self.services.wait()
  File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 640, in wait
    service.wait()
  File "/opt/stack/magnum/magnum/common/rpc_service.py", line 80, in wait
    self._server.wait()
  File "/usr/lib/python2.7/site-packages/oslo_messaging/server.py", line 251, in wrapper
    log_after, timeout_timer)
  File "/usr/lib/python2.7/site-packages/oslo_messaging/server.py", line 150, in wait_for_completion
    msg, log_after, timeout_timer)
  File "/usr/lib/python2.7/site-packages/oslo_messaging/server.py", line 115, in _wait
    LOG.debug(''.join(traceback.format_stack()))
 from (pid=8048) _wait /usr/lib/python2.7/site-packages/oslo_messaging/server.py:115

[Surojit Pathak (suro-patz)]

Software version, where the issue is observed -

[suro@oxy-dev magnum (master)]$ pwd
/opt/stack/magnum
[suro@oxy-dev magnum (master)]$ git branch -v
* master 2a8fd26 Merge "Change $LOGFILE path in configuration devstack"
[suro@oxy-dev magnum (master)]$

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/263867

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/263867
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=27b2868c082a6a69b3e7d4a56dee733a00e1f7b4
Submitter: Jenkins
Branch: master

commit 27b2868c082a6a69b3e7d4a56dee733a00e1f7b4
Author: Surojit Pathak <email address hidden>
Date: Tue Jan 5 01:32:39 2016 +0000

    oslo_messaging requires stop() before wait()

    According to [1], the correct usage is to call stop() before wait().

    [1] -
    http://docs.openstack.org/developer/oslo.messaging/notification_listener.html

    Change-Id: I930526add5bff312347cb9e41feee7cdcadf3895
    Closes-Bug: #1531239

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/magnum 2.0.0 release.