AttributeError: 'NoneType' object has no attribute 'obj' (driver.obj.release_segment(session, segment))

[Nobuto Murata]

When trying to delete a network, I hit a traceback.

ubuntu@neutron01:~$ neutron port-list

ubuntu@neutron01:~$ neutron net-list
+--------------------------------------+---------+---------+
| id | name | subnets |
+--------------------------------------+---------+---------+
| 822d2b2e-481f-4838-9fe5-459be7b10193 | int_net | |
| ac498310-833b-42f2-9009-049cac145c71 | ext_net | |
+--------------------------------------+---------+---------+

ubuntu@neutron01:~$ neutron --debug net-delete int_net
Request Failed: internal server error while processing your request.
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/neutronclient/shell.py", line 527, in run_subcommand
    return run_command(cmd, cmd_parser, sub_argv)
  File "/usr/lib/python2.7/dist-packages/neutronclient/shell.py", line 80, in run_command
    return cmd.run(known_args)
  File "/usr/lib/python2.7/dist-packages/neutronclient/neutron/v2_0/__init__.py", line 510, in run
    obj_deleter(_id)
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 112, in with_params
    ret = self.function(instance, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 354, in delete_network
    return self.delete(self.network_path % (network))
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1233, in delete
    headers=headers, params=params)
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1222, in retry_request
    headers=headers, params=params)
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1165, in do_request
    self._handle_fault_response(status_code, replybody)
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 1135, in _handle_fault_response
    exception_handler_v20(status_code, des_error_body)
  File "/usr/lib/python2.7/dist-packages/neutronclient/v2_0/client.py", line 85, in exception_handler_v20
    message=error_dict)
NeutronClientException: Request Failed: internal server error while processing your request.
ubuntu@neutron01:~$

/var/log/neutron/server.log
====
2014-03-13 12:30:09.930 16624 ERROR neutron.api.v2.resource [req-cc63906f-1e13-4d22-becf-86979d80399f None] delete failed
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource Traceback (most recent call last):
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/resource.py", line 87, in resource
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource result = method(request=request, **args)
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/api/v2/base.py", line 438, in delete
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource obj_deleter(request.context, id, **kwargs)
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/plugin.py", line 479, in delete_network
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource self.type_manager.release_segment(session, segment)
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/managers.py", line 104, in release_segment
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource driver.obj.release_segment(session, segment)
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource AttributeError: 'NoneType' object has no attribute 'obj'
2014-03-13 12:30:09.930 16624 TRACE neutron.api.v2.resource

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: neutron-plugin-ml2 1:2014.1~b3-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
Uname: Linux 3.13.0-16-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
Date: Thu Mar 13 12:36:03 2014
PackageArchitecture: all
ProcEnviron:
 TERM=screen.linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: neutron
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.arista.ini: [deleted]
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.brocade.ini: [deleted]
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.cisco.ini: [deleted]
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.ini: [deleted]
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.mlnx.ini: [deleted]
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.ncs.ini: [deleted]
modified.conffile..etc.neutron.plugins.ml2.ml2.conf.ofa.ini: [deleted]

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/85592

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/85592
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=af89d74d2961db6a04572375150ad908c9e72e78
Submitter: Jenkins
Branch: master

commit af89d74d2961db6a04572375150ad908c9e72e78
Author: Kevin Benton <email address hidden>
Date: Sun Apr 6 04:57:36 2014 -0700

    Verify ML2 type driver exists before calling del

    Verifies that an ML2 type driver exists for a given
    segment type before attempting to call the release_segment
    method on it. Logs an error if a type driver is not
    found.

    This covers the case where a segment is created with
    a given type and then ML2 is reconfigured without
    support for that type.

    DocImpact
    The ML2 documentation should be updated with a warning
    that disabling a network type driver and re-enabling
    it later may lead to possible DB inconsistencies.

    Closes-Bug: #1292102
    Change-Id: I65a35abf3ed57347bb6e8fee228f8c0697217c00

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/111263

[James Page (james-page)]

Cherry picked and proposed for stable/icehouse but I don't appear to have permissions to even nominate a bug task for icehouse.

[Alan Pevec (apevec)]

Don't worry about Icehouse task, stable release managers will add it once fix is merged.
Proposing a patch for stable/icehouse is much appreciated and is one of the methods to get the backport process started:
 https://wiki.openstack.org/wiki/StableBranch#Proposing_Fixes

Unfortunatelly your backport came after 2014.1.2 freeze so if you think this is a critical issue and must be included in 2014.1.2 please propose it for freeze exception on the openstack-stable-maint list.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/111263
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=ad82fadf546d39f3c905b5fb633f64afb7875a6f
Submitter: Jenkins
Branch: stable/icehouse

commit ad82fadf546d39f3c905b5fb633f64afb7875a6f
Author: Kevin Benton <email address hidden>
Date: Sun Apr 6 04:57:36 2014 -0700

    Verify ML2 type driver exists before calling del

    Verifies that an ML2 type driver exists for a given
    segment type before attempting to call the release_segment
    method on it. Logs an error if a type driver is not
    found.

    This covers the case where a segment is created with
    a given type and then ML2 is reconfigured without
    support for that type.

    DocImpact
    The ML2 documentation should be updated with a warning
    that disabling a network type driver and re-enabling
    it later may lead to possible DB inconsistencies.

    Closes-Bug: #1292102
    Change-Id: I65a35abf3ed57347bb6e8fee228f8c0697217c00
    (cherry picked from commit af89d74d2961db6a04572375150ad908c9e72e78)