Comment 1 for bug 1247295

is the scenario here also true when using neutron ml2 plugin + linuxbridge agent? I would've expected linuxbridge agent to work here.

Note -- even when using nova-net (not neutron) i've seen this error on the 1st vm boot... however subsequent boot calls succeed so I suspect the underlying code creates the bridge regardless of the error and the bridge can then be used in subsequent boots.