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[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1431191

Title:
  dhcp-agent running error：“RTNETLINK answers: Invalid argument”

Status in OpenStack Neutron (virtual network service):
  Expired

Bug description:
  The dhcp-agent running error In my openstack system. Two ports in the
  network, one is active status , another is build status.

  Base config options:
        "dhcp_delete_namespaces = True"   in /etc/neutron/dhcp_agent.ini
        "dhcp_agents_per_network = 2" in /etc/neutron/neutron.conf

  Neutron informaton :
         icehouse       release = "1.el6"    version = "2014.1.2"

  OS is CentOS 6.5

  I  found some log in the dhcp-agent.log file, such as:

  2015-03-11 17:18:00.925 31573 ERROR neutron.agent.dhcp_agent [-] Unable to enable dhcp for 1df2fa23-3e31-4371-99bf-fe138e7c6503.
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent Traceback (most recent call last):
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/dhcp_agent.py", line 129, in call_driver
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     getattr(driver, action)(**action_kwargs)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/dhcp.py", line 165, in enable
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     reuse_existing=True)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/dhcp.py", line 829, in setup
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     namespace=network.namespace)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/interface.py", line 196, in plug
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     namespace_obj.add_device_to_namespace(ns_dev)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/ip_lib.py", line 157, in add_device_to_namespace
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     device.link.set_netns(self.namespace)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/ip_lib.py", line 243, in set_netns
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     self._as_root('set', self.name, 'netns', namespace)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/ip_lib.py", line 218, in _as_root
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     kwargs.get('use_root_namespace', False))
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/ip_lib.py", line 71, in _as_root
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     namespace)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/ip_lib.py", line 82, in _execute
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     root_helper=root_helper)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent   File "/usr/lib/python2.6/site-packages/neutron/agent/linux/utils.py", line 76, in execute
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent     raise RuntimeError(m)
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent RuntimeError:
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent Command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'ip', 'link', 'set', 'tapb2312dc1-f7', 'netns', 'qdhcp-1df2fa23-3e31-4371-99bf-fe138e7c6503']
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent Exit code: 2
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent Stdout: ''
  2015-03-11 17:18:00.925 31573 TRACE neutron.agent.dhcp_agent Stderr: 'RTNETLINK answers: Invalid argument\n'

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