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[OpenStack Infra <1743586@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/535219
Committed: https://git.openstack.org/cgit/openstack/osprofiler/commit/?id=79e4e2de42e61556f6da251f351e56cadb07fe6d
Submitter: Zuul
Branch:    master

commit 79e4e2de42e61556f6da251f351e56cadb07fe6d
Author: Tovin Seven <vinhnt@xxxxxxxxxxxxxx>
Date:   Thu Jan 18 15:22:07 2018 +0700

    Check profiler instance before initialize
    
    Add a small check for this to an prevent issue in Nova [1]
    that causes some commands not working.
    
    [1] http://paste.openstack.org/show/641262/
    
    Change-Id: I685386695e13bf5034a1008dbdcff4539eb482d2
    Closes-Bug: #1743586


** Changed in: osprofiler
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1743586

Title:
  Nova operations fail when profiling is enabled

Status in OpenStack Compute (nova):
  New
Status in osprofiler:
  Fix Released

Bug description:
  Nova server-related operations fail with HTTP 500 when executed with
  profiling. Nova server log contains error "IndexError: pop from an
  empty deque" and stack trace pointing to osprofiler code:

  ERROR nova.api.openstack   File "/opt/stack/osprofiler/osprofiler/web.py", line 132, in __call__
  ERROR nova.api.openstack     return request.get_response(self.application)
  ERROR nova.api.openstack   File "/opt/stack/osprofiler/osprofiler/profiler.py", line 348, in __exit__
  ERROR nova.api.openstack     stop()
  ERROR nova.api.openstack   File "/opt/stack/osprofiler/osprofiler/profiler.py", line 87, in stop
  ERROR nova.api.openstack     profiler.stop(info=info)
  ERROR nova.api.openstack   File "/opt/stack/osprofiler/osprofiler/profiler.py", line 406, in stop
  ERROR nova.api.openstack     self._notify("%s-stop" % self._name.pop(), info)

  
  Steps to reproduce:
   0. Take the latest Devstack with osprofiler enabled.
   1. Execute `openstack --os-profile SECRET_KEY server list`

  Observed behavior:
    $ openstack --os-profile SECRET_KEY server list
    The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-73de8073-94b7-44f0-96ca-5a0c5979636c)
    Trace ID: 5f0d7147-6e15-41c4-a61b-84f74e3787d4
    Display trace with command:
    osprofiler trace show --html 5f0d7147-6e15-41c4-a61b-84f74e3787d4

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