[ovs-discuss] vswitchd is hanging on service start

Ben Pfaff blp at ovn.org
Fri Oct 6 05:14:11 UTC 2017

On Thu, Oct 05, 2017 at 11:37:09PM +0000, Omar Ramadan wrote:
> vswitchd is blocking when I try starting the service on system boot. Can someone help me make sense of this message:
> vagrant at magma-dev:~$ sudo tail -f /var/log/openvswitch/ovs-vswitchd.log
> 2017-10-05T23:32:07.501Z|00019|ofproto_dpif|INFO|system at ovs-system: Datapath supports ct_orig_tuple
> 2017-10-05T23:32:07.516Z|00001|ofproto_dpif_upcall(handler1)|INFO|received packet on unassociated datapath port 0
> 2017-10-05T23:32:07.523Z|00020|bridge|INFO|bridge managed_br0: added interface managed_br0 on port 65534
> 2017-10-05T23:32:08.528Z|00001|ovs_rcu(urcu5)|WARN|blocked 1007 ms waiting for main to quiesce
> 2017-10-05T23:32:09.523Z|00002|ovs_rcu(urcu5)|WARN|blocked 2002 ms waiting for main to quiesce
> ...

Usually this kind of message means that the thread in question (the main
thread in this case) is not cycling through the main loop in a
reasonable time but blocked somewhere.  If you can get a backtrace of
the main thread (live or from a core dump), it will probably point to
the place it's blocking.

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