Comment 7 for bug 1647431

So I debugged from this failure:

http://logs.openstack.org/40/402140/7/check/gate-grenade-dsvm-neutron-multinode-ubuntu-xenial/ad0cf41/logs/grenade.sh.txt.gz#_2016-12-05_09_07_08_778

The server uuid there is 7e8aad9d-50e1-4b6c-8418-7395a035256f.

I traced that through to n-cpu where nova calls os-terminate_connection in cinder:

http://logs.openstack.org/40/402140/7/check/gate-grenade-dsvm-neutron-multinode-ubuntu-xenial/ad0cf41/logs/new/screen-n-cpu.txt.gz#_2016-12-05_09_07_13_263

Tracing that request to c-api gets me to the point that c-api does an RPC CALL to c-vol:

http://logs.openstack.org/40/402140/7/check/gate-grenade-dsvm-neutron-multinode-ubuntu-xenial/ad0cf41/logs/new/screen-c-api.txt.gz#_2016-12-05_09_07_13_391

At that point it hangs, the RPC call never comes back and we timeout and die. I also don't see the request from c-api req-42b76e49-9bec-4ac5-b457-938bc82b3649 show up in c-vol so it looks like it's just dropped.