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[Brian Haley <1773551@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1773551

Title:
  Error loading interface driver 'neutron.agent.linux.interface.Bri
  dgeInterfaceDriver'

Status in neutron:
  Invalid

Bug description:
  ERROR message below：

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime [-]
  Error loading class by alias: NoMatches: No 'neutron.interface_dri
  vers' driver found, looking for
  'neutron.agent.linux.interface.BridgeInterfaceDriver'

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime
  Traceback (most recent call last):

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File
  "/usr/lib/python2.7/dist-packages/neutron_lib/utils/runtime.py" , line
  46, in load_class_by_alias_or_classname

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime
  namespace, name, warn_on_missing_entrypoint=False)

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File
  "/usr/lib/python2.7/dist-packages/stevedore/driver.py", line 61 , in
  __init__

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime
  warn_on_missing_entrypoint=warn_on_missing_entrypoint

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File
  "/usr/lib/python2.7/dist-packages/stevedore/named.py", line 89, in
  __init__

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime
  self._init_plugins(extensions)

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime File
  "/usr/lib/python2.7/dist-packages/stevedore/driver.py", line 11 3, in
  _init_plugins

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime
  (self.namespace, name))

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime
  NoMatches: No 'neutron.interface_drivers' driver found, looking for 'n
  eutron.agent.linux.interface.BridgeInterfaceDriver'

  2018-05-27 00:00:59.541 11767 ERROR neutron_lib.utils.runtime

  2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime [-]
  Error loading class by class name: ImportError: Class BridgeInterf
  aceDriver cannot be found (['Traceback (most recent call last):\n', '
  File "/usr/local/lib/python2.7/dist-packages/oslo_utils/impor
  tutils.py", line 32, in import_class\n return
  getattr(sys.modules[mod_str], class_str)\n', "AttributeError: 'module'
  object has n o attribute 'BridgeInterfaceDriver'\n"])

  2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime
  Traceback (most recent call last):

  2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime File
  "/usr/lib/python2.7/dist-packages/neutron_lib/utils/runtime.py" , line
  52, in load_class_by_alias_or_classname 2018-05-27 00:00:59.542 11767
  ERROR neutron_lib.utils.runtime class_to_load =
  importutils.import_class(name) 2018-05-27 00:00:59.542 11767 ERROR
  neutron_lib.utils.runtime File "/usr/local/lib/python2.7/dist-
  packages/oslo_utils/importutils. py", line 36, in import_class

  2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime
  traceback.format_exception(*sys.exc_info())))

  2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime
  ImportError: Class BridgeInterfaceDriver cannot be found (['Traceback
  (most recent call last):\n', ' File "/usr/local/lib/python2.7/dist-
  packages/oslo_utils/importutils.py", line 32, in import_class\n return
  getattr(sys.modules[mod_str], class_str)\n', "AttributeError: 'module'
  object has no attribute 'BridgeInterfaceDriver'\n"] )

  2018-05-27 00:00:59.542 11767 ERROR neutron_lib.utils.runtime

  2018-05-27 00:00:59.542 11767 ERROR neutron.agent.common.utils [-]
  Error loading interface driver 'neutron.agent.linux.interface.Bri
  dgeInterfaceDriver'

  I has worked well a long time after the first install. When i do a
  system update action ,this issue appear。

  I hava check the source as well,which is correct.

  I do a test like below ,and it work well:

  # python
  Python 2.7.12 (default, Dec  4 2017, 14:50:18) 
  [GCC 5.4.0 20160609] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import_str = "neutron.agent.linux.interface.BridgeInterfaceDriver"
  >>> mod_str, _sep, class_str = import_str.rpartition('.')
  >>> mod_str
  'neutron.agent.linux.interface'
  >>> class_str
  'BridgeInterfaceDriver'
  >>> __import__(mod_str)
  <module 'neutron' from '/usr/lib/python2.7/dist-packages/neutron/__init__.pyc'>
  >>> import sys
  >>> sys.modules[mod_str]
  <module 'neutron.agent.linux.interface' from '/usr/lib/python2.7/dist-packages/neutron/agent/linux/interface.pyc'>
  >>> a=getattr(sys.modules[mod_str],class_str)
  >>> a
  <class 'neutron.agent.linux.interface.BridgeInterfaceDriver'>
  >>> exit()

  Why this issue happend ? Any one can help me?

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