Comment 18 for bug 1052535

I am experiencing the same problem with the router namespace after deleting the network, router and gateway. The l3-agent.log file has the following error message:

2013-05-20 17:05:50 ERROR [quantum.agent.l3_agent] Failed deleting namespace 'qrouter-c04d91b9-ae63-4699-a889-54772fd4d771'
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 189, in _destroy_router_namespaces
    self._destroy_router_namespace(ns)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 195, in _destroy_router_namespace
    for d in ns_ip.get_devices(exclude_loopback=True):
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line 73, in get_devices
    self.root_helper, self.namespace)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line 58, in _execute
    root_helper=root_helper)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/utils.py", line 61, in execute
    raise RuntimeError(m)
RuntimeError:
Command: ['sudo', 'quantum-rootwrap', '/etc/quantum/rootwrap.conf', 'ip', 'netns', 'exec', 'qrouter-c04d91b9-ae63-4699-a889-54772fd4d771', 'ip', '-o', 'link', 'list']
Exit code: 1
Stdout: ''
Stderr: 'seting the network namespace failed: Invalid argument\n'
2013-05-20 17:05:54 ERROR [quantum.agent.l3_agent] Failed synchronizing routers
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 639, in _sync_routers_task
    self._process_routers(routers, all_routers=True)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 619, in _process_routers
    self._router_added(r['id'], r)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 232, in _router_added
    self._create_router_namespace(ri)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 210, in _create_router_namespace
    ip_wrapper.netns.execute(['sysctl', '-w', 'net.ipv4.ip_forward=1'])
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/ip_lib.py", line 407, in execute
    check_exit_code=check_exit_code)
  File "/usr/lib/python2.7/dist-packages/quantum/agent/linux/utils.py", line 61, in execute
    raise RuntimeError(m)
RuntimeError: