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[Inessa Vasilevskaya <ivasilevskaya@xxxxxxxxxxxx>]

Public bug reported:

In situation when there is some cached datapath_id and openflow switch
doesn't respond in time (causing RuntimeError), UnboundLocalError is
raised

2016-05-25 14:57:28 ERR ryu.lib.hub [req-6efe2697-b494-4c54-97dc-4d8d1f43cab6 - - - - -] hub: uncaught exception: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ryu/lib/hub.py", line 52, in _launch
    func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_ryuapp.py", line 35, in agent_main_wrapper
    ovs_agent.main(bridge_classes)
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 2118, in main
    agent.daemon_loop()
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 2041, in daemon_loop
    self.rpc_loop(polling_manager=pm)
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1910, in rpc_loop
    ovs_status = self.check_ovs_status()
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1718, in check_ovs_status
    status = self.int_br.check_canary_table()
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/br_int.py", line 52, in check_canary_table
    flows = self.dump_flows(constants.CANARY_TABLE)
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ofswitch.py", line 125, in dump_flows
    (dp, ofp, ofpp) = self._get_dp()
  File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_bridge.py", line 61, in _get_dp
    if new_dpid_str != dpid_str:
UnboundLocalError: local variable 'dpid_str' referenced before assignment

** Affects: neutron
     Importance: Undecided
     Assignee: Inessa Vasilevskaya (ivasilevskaya)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Inessa Vasilevskaya (ivasilevskaya)

** Summary changed:

- UnboundLocalError with native openflow agent when switch timeout
+ UnboundLocalError with native openflow agent on switch timeout

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https://bugs.launchpad.net/bugs/1588042

Title:
  UnboundLocalError with native openflow agent on switch timeout

Status in neutron:
  New

Bug description:
  In situation when there is some cached datapath_id and openflow switch
  doesn't respond in time (causing RuntimeError), UnboundLocalError is
  raised

  2016-05-25 14:57:28 ERR ryu.lib.hub [req-6efe2697-b494-4c54-97dc-4d8d1f43cab6 - - - - -] hub: uncaught exception: Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/ryu/lib/hub.py", line 52, in _launch
      func(*args, **kwargs)
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_ryuapp.py", line 35, in agent_main_wrapper
      ovs_agent.main(bridge_classes)
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 2118, in main
      agent.daemon_loop()
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 2041, in daemon_loop
      self.rpc_loop(polling_manager=pm)
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1910, in rpc_loop
      ovs_status = self.check_ovs_status()
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 1718, in check_ovs_status
      status = self.int_br.check_canary_table()
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/br_int.py", line 52, in check_canary_table
      flows = self.dump_flows(constants.CANARY_TABLE)
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ofswitch.py", line 125, in dump_flows
      (dp, ofp, ofpp) = self._get_dp()
    File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/ovs_bridge.py", line 61, in _get_dp
      if new_dpid_str != dpid_str:
  UnboundLocalError: local variable 'dpid_str' referenced before assignment

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