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[Xuanzhou Perry Dong <oss_xzdong@xxxxxxx>]

Public bug reported:

Description
===========
During handling of HUP signal in nova, the following exception is generated:

2016-07-07 01:36:18.012 DEBUG nova.virt.libvirt.host [-] Starting green dispatch thread from (pid=30178) _init_events /op
t/stack/nova/nova/virt/libvirt/host.py:341
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/poll.py", line 115, in wait
    listener.cb(fileno)
  File "/usr/local/lib/python2.7/dist-packages/eventlet/greenthread.py", line 214, in main
    result = function(*args, **kwargs)
  File "/opt/stack/nova/nova/utils.py", line 1053, in context_wrapper
    return func(*args, **kwargs)
  File "/opt/stack/nova/nova/virt/libvirt/host.py", line 131, in _dispatch_thread
    self._dispatch_events()
  File "/opt/stack/nova/nova/virt/libvirt/host.py", line 236, in _dispatch_events
    assert _c
AssertionError


Steps to reproduce
==================
1. Start a devstack with latest master branch.

2. Devstack doesn't start the nova-compute with daemon. So kill the
nova-compute started by devstack and replace it with "nohup
/usr/local/bin/nova-compute --config-file /etc/nova/nova.conf &"

3. Send a HUP signal to nova-compute process.

Expected result
===============
Expect the nova-compute reloads the configuration file and no exception is generated.

Actual result
=============
An exception is generated.

Environment
===========
1. Nova version:

vagrant@vagrant-ubuntu-trusty-64:/opt/stack/nova/nova$ git log -1
commit 2d5460d085895a577734547660a8bcfc53b04de2
Merge: 51fdeaf 40ea165
Author: Jenkins <jenkins@xxxxxxxxxxxxxxxxxxxx>
Date:   Wed Jun 22 06:18:23 2016 +0000

    Merge "Publish proxy APIs deprecation in api ref doc"


Logs & Configs
==============
As above.

** Affects: nova
     Importance: Medium
     Assignee: Xuanzhou Perry Dong (oss-xzdong)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => Xuanzhou Perry Dong (oss-xzdong)

** Changed in: nova
   Importance: Undecided => Medium

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

** Changed in: nova
       Status: Confirmed => In Progress

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https://bugs.launchpad.net/bugs/1599688

Title:
  host.py assertion error during NOVA handling of HUP signal

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Description
  ===========
  During handling of HUP signal in nova, the following exception is generated:

  2016-07-07 01:36:18.012 DEBUG nova.virt.libvirt.host [-] Starting green dispatch thread from (pid=30178) _init_events /op
  t/stack/nova/nova/virt/libvirt/host.py:341
  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/poll.py", line 115, in wait
      listener.cb(fileno)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/greenthread.py", line 214, in main
      result = function(*args, **kwargs)
    File "/opt/stack/nova/nova/utils.py", line 1053, in context_wrapper
      return func(*args, **kwargs)
    File "/opt/stack/nova/nova/virt/libvirt/host.py", line 131, in _dispatch_thread
      self._dispatch_events()
    File "/opt/stack/nova/nova/virt/libvirt/host.py", line 236, in _dispatch_events
      assert _c
  AssertionError

  
  Steps to reproduce
  ==================
  1. Start a devstack with latest master branch.

  2. Devstack doesn't start the nova-compute with daemon. So kill the
  nova-compute started by devstack and replace it with "nohup
  /usr/local/bin/nova-compute --config-file /etc/nova/nova.conf &"

  3. Send a HUP signal to nova-compute process.

  Expected result
  ===============
  Expect the nova-compute reloads the configuration file and no exception is generated.

  Actual result
  =============
  An exception is generated.

  Environment
  ===========
  1. Nova version:

  vagrant@vagrant-ubuntu-trusty-64:/opt/stack/nova/nova$ git log -1
  commit 2d5460d085895a577734547660a8bcfc53b04de2
  Merge: 51fdeaf 40ea165
  Author: Jenkins <jenkins@xxxxxxxxxxxxxxxxxxxx>
  Date:   Wed Jun 22 06:18:23 2016 +0000

      Merge "Publish proxy APIs deprecation in api ref doc"

  
  Logs & Configs
  ==============
  As above.

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