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[Bug 1773551] [NEW] Error loading interface driver 'neutron.agent.linux.interface.Bri dgeInterfaceDriver'

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: LittleMice <1773551@xxxxxxxxxxxxxxxxxx>
Date: Sat, 26 May 2018 16:37:18 -0000
Reply-to: Bug 1773551 <1773551@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

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?

** Affects: neutron
     Importance: Undecided
         Status: New

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

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

Status in neutron:
  New

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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Follow ups

[Bug 1773551] Re: Error loading interface driver 'neutron.agent.linux.interface.Bri dgeInterfaceDriver'
From: Brian Haley, 2023-01-23