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[Bug 1696874] [NEW] unsafe set reference in neutron iptables code

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Public bug reported:

:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-21b216b4-9e00-4f16-aa90-fc05f875e23f - - - - -] Error while processing VIF ports
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most recent call last):
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1825, in rpc_loop
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     ovs_restarted)
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1574, in process_network_ports
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     port_info.get('updated', set()))
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/securitygroups_rpc.py", line 303, in setup_port_filters
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.refresh_firewall(updated_devices)
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/securitygroups_rpc.py", line 142, in decorated_function
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     *args, **kwargs)
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/securitygroups_rpc.py", line 257, in refresh_firewall
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.firewall.update_port_filter(device)
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.gen.next()
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/firewall.py", line 110, in defer_apply
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.filter_defer_apply_off()
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/iptables_firewall.py", line 844, in filter_defer_apply_off
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self._remove_conntrack_entries_from_sg_updates()
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/iptables_firewall.py", line 829, in _remove_conntrack_entries_from_sg_updates
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self._clean_deleted_sg_rule_conntrack_entries()
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/iptables_firewall.py", line 779, in _clean_deleted_sg_rule_conntrack_entries
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     for sg_id in self.updated_rule_sg_ids:
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent RuntimeError: Set changed size during iteration
:2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent

** Affects: neutron
     Importance: High
     Assignee: Kevin Benton (kevinbenton)
         Status: In Progress

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

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https://bugs.launchpad.net/bugs/1696874

Title:
  unsafe set reference in neutron iptables code

Status in neutron:
  In Progress

Bug description:
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-21b216b4-9e00-4f16-aa90-fc05f875e23f - - - - -] Error while processing VIF ports
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent Traceback (most recent call last):
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1825, in rpc_loop
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     ovs_restarted)
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1574, in process_network_ports
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     port_info.get('updated', set()))
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/securitygroups_rpc.py", line 303, in setup_port_filters
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.refresh_firewall(updated_devices)
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/securitygroups_rpc.py", line 142, in decorated_function
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     *args, **kwargs)
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/securitygroups_rpc.py", line 257, in refresh_firewall
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.firewall.update_port_filter(device)
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.gen.next()
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/firewall.py", line 110, in defer_apply
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self.filter_defer_apply_off()
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/iptables_firewall.py", line 844, in filter_defer_apply_off
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self._remove_conntrack_entries_from_sg_updates()
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/iptables_firewall.py", line 829, in _remove_conntrack_entries_from_sg_updates
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     self._clean_deleted_sg_rule_conntrack_entries()
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent   File "/usr/lib/python2.7/dist-packages/neutron/agent/linux/iptables_firewall.py", line 779, in _clean_deleted_sg_rule_conntrack_entries
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent     for sg_id in self.updated_rule_sg_ids:
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent RuntimeError: Set changed size during iteration
  :2017-06-01 14:26:28.528 13973 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent

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