Comment 2 for bug 1852175

I suspect there are at least two errors happening around the same time in your system. The traceback is about the report_state RPC (which in this case is a call(), so we'll wait for the response) not getting a response before timeout.

However the report_state message is not directly involved in booting a VM.

So I suggest multiple things to look at:

1) Is there another error message in your logs while booting the vm? I suspect there is. Usually there's an error message and a traceback in the 'openstack server show' output already in these cases too. Can you copy-paste that here?

2) Usually report_state calls fail to respond timely when neutron-server is overloaded. Is this a fresh deployment? How many neutron agents do you have? What's the overall workload hitting neutron-server? Have you tried tuning your neutron server's worker settings, especially raising the value of rpc_state_report_workers in neutron.conf?