Folks, could we port FIX to STABLE/ESSEX ?

Also we need to port this one:

https://github.com/openstack/nova/commit/50b9c032fdc520c1461ff4651b60b4fc4b8f8e19

Because I've also plunged in this traceback, if I've tried to launch an instance:

compute.log

2012-08-07 22:25:03 DEBUG nova.rpc.amqp [req-fd243ca3-feaf-4071-926d-2a83ed6467ba t1a t1] Making asynchronous cast on network... from (pid=31512) cast /usr/lib/python2.6/site-packages/nova/rpc/amqp.py:351
2012-08-07 22:25:03 ERROR nova.rpc.amqp [req-fd243ca3-feaf-4071-926d-2a83ed6467ba t1a t1] Exception during message handling
2012-08-07 22:25:03 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/rpc/amqp.py", line 253, in _process_data
2012-08-07 22:25:03 TRACE nova.rpc.amqp     rval = node_func(context=ctxt, **node_args)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/exception.py", line 114, in wrapped
2012-08-07 22:25:03 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 183, in decorated_function
2012-08-07 22:25:03 TRACE nova.rpc.amqp     sys.exc_info())
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self.gen.next()
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 177, in decorated_function
2012-08-07 22:25:03 TRACE nova.rpc.amqp     return function(self, context, instance_uuid, *args, **kwargs)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 657, in run_instance
2012-08-07 22:25:03 TRACE nova.rpc.amqp     do_run_instance()
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/utils.py", line 945, in inner
2012-08-07 22:25:03 TRACE nova.rpc.amqp     retval = f(*args, **kwargs)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 656, in do_run_instance
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self._run_instance(context, instance_uuid, **kwargs)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 457, in _run_instance
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self._set_instance_error_state(context, instance_uuid)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self.gen.next()
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 438, in _run_instance
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self._deallocate_network(context, instance)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self.gen.next()
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 435, in _run_instance
2012-08-07 22:25:03 TRACE nova.rpc.amqp     injected_files, admin_password)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 598, in _spawn
2012-08-07 22:25:03 TRACE nova.rpc.amqp     self._legacy_nw_info(network_info), block_device_info)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/exception.py", line 114, in wrapped
2012-08-07 22:25:03 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/connection.py", line 919, in spawn
2012-08-07 22:25:03 TRACE nova.rpc.amqp     block_device_info=block_device_info)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/connection.py", line 1539, in to_xml
2012-08-07 22:25:03 TRACE nova.rpc.amqp     rescue, block_device_info)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/connection.py", line 1422, in _prepare_xml_info
2012-08-07 22:25:03 TRACE nova.rpc.amqp     nics.append(self.vif_driver.plug(instance, network, mapping))
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/vif.py", line 101, in plug
2012-08-07 22:25:03 TRACE nova.rpc.amqp     return self._get_configurations(network, mapping)
2012-08-07 22:25:03 TRACE nova.rpc.amqp   File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/vif.py", line 71, in _get_configurations
2012-08-07 22:25:03 TRACE nova.rpc.amqp     'ip_address': mapping['ips'][0]['ip'],
2012-08-07 22:25:03 TRACE nova.rpc.amqp IndexError: list index out of range
2012-08-07 22:25:03 TRACE nova.rpc.amqp