** Changed in: neutron
Status: Fix Committed => Fix Released
** Changed in: neutron
Milestone: None => liberty-1
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https://bugs.launchpad.net/bugs/1449944
Title:
Tunnel creation race in ovs-agent, if tunnel_update is called from ml2
plugin
Status in OpenStack Neutron (virtual network service):
Fix Released
Bug description:
There is a race condition in ovs-agent if l2pop is not used.
If ovs agent receives tunnel_update rpc message and starts handling
it, it searches in local vlan map and calls ovs-ofctl leading to yield
in eventlet. If in another coroutine ovs agent creates a new
LocalVLANMapping due to creation of new port for new tenant, local
vlan map changes and causes exception, after eventlet starts handling
coroutine of tunnel_update.
2015-04-09 17:41:47.771 6067 ERROR oslo.messaging.rpc.dispatcher
[req-1c5353f1-38bd-49f6-8ad1-31ea14484156 ] Exception during message handling:
dictionary changed size during iteration
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
Traceback (most recent call last):
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher File
"/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 134,
in _dispatch_and_reply
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
incoming.message))
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher File
"/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 177,
in _dispatch
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
return self._do_dispatch(endpoint, method, ctxt, args)
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher File
"/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 123,
in _do_dispatch
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
result = getattr(endpoint, method)(ctxt, **new_args)
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher File
"/usr/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py",
line 347, in tunnel_update
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
tunnel_type)
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher File
"/usr/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py",
line 1055, in _setup_tunnel_port
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher for
network_id, vlan_mapping in self.local_vlan_map.iteritems():
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
RuntimeError: dictionary changed size during iteration
2015-04-09 17:41:47.771 6067 TRACE oslo.messaging.rpc.dispatcher
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