Comment 4 for bug 1267486

Also there are a lot of erros like:
2014-01-09T14:14:06.992459+00:00 emerg: ERROR: Failed storing info cache
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/nova/network/api.py", line 75, in update_instance_cache_with_nw_info
    nw_info = api._get_instance_nw_info(context, instance)
  File "/usr/lib/python2.6/site-packages/nova/network/neutronv2/api.py", line 465, in _get_instance_nw_info
    nw_info = self._build_network_info_model(context, instance, networks)
  File "/usr/lib/python2.6/site-packages/nova/network/neutronv2/api.py", line 1011, in _build_network_info_model
    subnets)
  File "/usr/lib/python2.6/site-packages/nova/network/neutronv2/api.py", line 964, in _nw_info_build_network
    label=network_name,
UnboundLocalError: local variable 'network_name' referenced before assignment

we have bug for this trace, but I can not find them(