This is caused by the restart of the ovs daemons (part of the upgrade process - its done post install to minimize downtime):
2015-05-28 14:24:18.336 47866 ERROR neutron.agent.linux.ovsdb_monitor [-] Error received from ovsdb monitor: ovsdb-client: unix:/var/run/openvswitch/db.sock: receive failed (End of file) I would suspect that the code in neutron is not behaving very nicely in terms of recovering from this disconnect, resulting the in the lockup you see. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to neutron in Ubuntu. https://bugs.launchpad.net/bugs/1460164 Title: upgrade of openvswitch-switch can sometimes break neutron-plugin- openvswitch-agent To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/neutron/+bug/1460164/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
