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[Bug 1627902] [NEW] DHCP agent conflicting with dynamic IPv6 addresses

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Public bug reported:

Below in gate logs. Completely breaks the DHCP for that network because
it's trying to add an address that conflicts with one given to it via
RA. Cause is the merge of d86f1b87f01c53c3e0b085086133b311e5bf3ab5 which
allowed the agent to be configured with stateless v6 addresses to serve
metadata correctly.

http://logs.openstack.org/12/343312/5/gate/gate-tempest-dsvm-neutron-
full-ubuntu-
xenial/c11b933/logs/screen-q-dhcp.txt.gz?level=TRACE#_2016-09-26_21_45_40_604

2016-09-26 21:45:40.604 13605 ERROR neutron.agent.linux.utils [-] Exit
code: 2; Stdin: ; Stdout: ; Stderr: RTNETLINK answers: File exists

2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for 81d252a2-8207-4e8c-a286-07fb3494a3ec.
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/dhcp/agent.py", line 114, in call_driver
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 212, in enable
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     interface_name = self.device_manager.setup(self.network)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 1396, in setup
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     namespace=network.namespace)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/interface.py", line 129, in init_l3
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     device.addr.add(ip_cidr)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 577, in add
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     self._as_root([net.version], tuple(args))
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 364, in _as_root
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     use_root_namespace=use_root_namespace)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 95, in _as_root
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     log_fail_as_error=self.log_fail_as_error)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 104, in _execute
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     log_fail_as_error=log_fail_as_error)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/utils.py", line 138, in execute
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     raise RuntimeError(msg)
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent RuntimeError: Exit code: 2; Stdin: ; Stdout: ; Stderr: RTNETLINK answers: File exists
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent 
2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent

** Affects: neutron
     Importance: Undecided
     Assignee: Kevin Benton (kevinbenton)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Kevin Benton (kevinbenton)

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https://bugs.launchpad.net/bugs/1627902

Title:
  DHCP agent conflicting with dynamic IPv6 addresses

Status in neutron:
  New

Bug description:
  Below in gate logs. Completely breaks the DHCP for that network
  because it's trying to add an address that conflicts with one given to
  it via RA. Cause is the merge of
  d86f1b87f01c53c3e0b085086133b311e5bf3ab5 which allowed the agent to be
  configured with stateless v6 addresses to serve metadata correctly.

  http://logs.openstack.org/12/343312/5/gate/gate-tempest-dsvm-neutron-
  full-ubuntu-
  xenial/c11b933/logs/screen-q-dhcp.txt.gz?level=TRACE#_2016-09-26_21_45_40_604

  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.linux.utils [-] Exit
  code: 2; Stdin: ; Stdout: ; Stderr: RTNETLINK answers: File exists

  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for 81d252a2-8207-4e8c-a286-07fb3494a3ec.
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/dhcp/agent.py", line 114, in call_driver
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 212, in enable
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     interface_name = self.device_manager.setup(self.network)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 1396, in setup
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     namespace=network.namespace)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/interface.py", line 129, in init_l3
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     device.addr.add(ip_cidr)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 577, in add
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     self._as_root([net.version], tuple(args))
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 364, in _as_root
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     use_root_namespace=use_root_namespace)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 95, in _as_root
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     log_fail_as_error=self.log_fail_as_error)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 104, in _execute
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     log_fail_as_error=log_fail_as_error)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/utils.py", line 138, in execute
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent     raise RuntimeError(msg)
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent RuntimeError: Exit code: 2; Stdin: ; Stdout: ; Stderr: RTNETLINK answers: File exists
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent 
  2016-09-26 21:45:40.604 13605 ERROR neutron.agent.dhcp.agent

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