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[Bug 1625013] [NEW] dhcpv6-stateless cause dhcp _generate_opts_per_subnet fail

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Public bug reported:

ipv6 subnet with dhcpv6_stateless address mode cause KeyError in
https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L895
, when force_metadata is configured as True.

2016-09-19 06:55:44.211 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for c0eea6e2-f98d-48b9-aab0-67113a82a70e.
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent Traceback (most recent call last):
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 114, in call_driver
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 213, in enable
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self.spawn_process()
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 425, in spawn_process
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self._spawn_or_reload_process(reload_with_HUP=False)
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 434, in _spawn_or_reload_process
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self._output_config_files()
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 467, in _output_config_files
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self._output_opts_file()
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 845, in _output_opts_file
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     options, subnet_index_map = self._generate_opts_per_subnet()
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 895, in _generate_opts_per_subnet
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     subnet_dhcp_ip = subnet_to_interface_ip[subnet.id]
2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent KeyError: u'7e086056-521a-4d91-b2a7-6d1b3fffb49b'

** Affects: neutron
     Importance: Undecided
     Assignee: ZongKai LI (lzklibj)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => ZongKai LI (lzklibj)

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https://bugs.launchpad.net/bugs/1625013

Title:
  dhcpv6-stateless cause dhcp _generate_opts_per_subnet fail

Status in neutron:
  New

Bug description:
  ipv6 subnet with dhcpv6_stateless address mode cause KeyError in
  https://github.com/openstack/neutron/blob/master/neutron/agent/linux/dhcp.py#L895
  , when force_metadata is configured as True.

  2016-09-19 06:55:44.211 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for c0eea6e2-f98d-48b9-aab0-67113a82a70e.
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent Traceback (most recent call last):
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 114, in call_driver
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 213, in enable
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self.spawn_process()
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 425, in spawn_process
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self._spawn_or_reload_process(reload_with_HUP=False)
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 434, in _spawn_or_reload_process
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self._output_config_files()
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 467, in _output_config_files
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     self._output_opts_file()
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 845, in _output_opts_file
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     options, subnet_index_map = self._generate_opts_per_subnet()
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent   File "/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 895, in _generate_opts_per_subnet
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent     subnet_dhcp_ip = subnet_to_interface_ip[subnet.id]
  2016-09-19 06:55:44.211 TRACE neutron.agent.dhcp.agent KeyError: u'7e086056-521a-4d91-b2a7-6d1b3fffb49b'

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