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[Brian Haley <1754563@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1754563

Title:
  Arp_responder function has failed since Ocata

Status in neutron:
  Fix Released

Bug description:
  It seems that the code has changed since Ocata.

  cat /usr/lib/python2.7/dist-packages/neutron/agent/linux/ip_lib.py
  --------------------------------------------------------------------------------------
  ...
  # NOTE(haleyb): These neighbour functions live outside the IpNeighCommand
  # class since not all callers require it.
  def add_neigh_entry(ip_address, mac_address, device, namespace=None, **kwargs):
      """Add a neighbour entry.

      :param ip_address: IP address of entry to add
      :param mac_address: MAC address of entry to add
      :param device: Device name to use in adding entry
      :param namespace: The name of the namespace in which to add the entry
      """
      ip_version = get_ip_version(ip_address)
      privileged.add_neigh_entry(ip_version,
                                 ip_address,
                                 mac_address,
                                 device,
                                 namespace,
                                 **kwargs)
  ...
  ..
  --------------------------------------------------------------------------------------

  If you set arp_responder=true, you will encounter the following error:

  --------------------------------------------------------------------------------------
  2018-03-09 12:35:54.590 2317 INFO neutron.agent.securitygroups_rpc [req-13215026-d027-4dff-830c-8c01a3e24b7e - - - - -] Refresh firewall rules
  2018-03-09 12:35:54.723 2317 INFO oslo.privsep.daemon [req-ffd165f2-9b17-49f4-9729-f75ab05f4f63 - - - - -] Running privsep helper: ['sudo', 'privsep-helper', '--config-file', '/etc/neutron/neutron.conf', '--config-file', '/etc/neutron/plugins/ml2/linuxbridge_agent.ini', '--privsep_context', 'neutron.privileged.default', '--privsep_sock_path', '/tmp/tmpOymdtx/privsep.sock']
  2018-03-09 12:35:54.737 2317 WARNING oslo.privsep.daemon [-] privsep log: sudo: no tty present and no askpass program specified
  2018-03-09 12:35:54.749 2317 CRITICAL oslo.privsep.daemon [req-ffd165f2-9b17-49f4-9729-f75ab05f4f63 - - - - -] privsep helper command exited non-zero (1)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server [req-ffd165f2-9b17-49f4-9729-f75ab05f4f63 - - - - -] Exception during message handling: FailedToDropPrivileges: privsep helper command exited non-zero (1)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/server.py", line 160, in _process_incoming
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 213, in dispatch
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 183, in _do_dispatch
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_log/helpers.py", line 67, in wrapper
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     return method(*args, **kwargs)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/l2pop/rpc_manager/l2population_rpc.py", line 41, in add_fdb_entries
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     self.fdb_add(context, self._unmarshall_fdb_entries(fdb_entries))
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 895, in fdb_add
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     interface)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 746, in add_fdb_entries
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     self.add_fdb_ip_entry(mac, ip, interface)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/linuxbridge/agent/linuxbridge_neutron_agent.py", line 737, in add_fdb_ip_entry
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     ip_lib.add_neigh_entry(ip, mac, interface)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/ip_lib.py", line 997, in add_neigh_entry
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     **kwargs)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_privsep/priv_context.py", line 204, in _wrap
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     self.start()
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_privsep/priv_context.py", line 215, in start
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     channel = daemon.RootwrapClientChannel(context=self)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/dist-packages/oslo_privsep/daemon.py", line 327, in __init__
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server     raise FailedToDropPrivileges(msg)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server FailedToDropPrivileges: privsep helper command exited non-zero (1)
  2018-03-09 12:35:54.750 2317 ERROR oslo_messaging.rpc.server 
  --------------------------------------------------------------------------------------

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