[ovs-discuss] sys error log when delete a fake bridge

[Kris zhang]

Thanks Jesse,  I only put a DHCP listen ip on this port br100:
> ifconfig br100 192.188.1.10/24 up
And then i run a dnsmasq process by this listening ip.

Also i found there is a network loop between two hosts, and both hosts are
use single NIC, and the host ip is on br0. I don't know why network loop
happened. but after i stop the loop by:
> ifconfig eth0 down
And i try to delete br100, one of the hosts is ok, another hosts is not ok,
the error syslog "kernel: unregister_netdevice: waiting for br100 to become
free. Usage count=1" constantly displayed.

so if the ovs cannot be used in the host which only has single NIC?
(because of the network loop).

Best regards,
Kris



On Fri, May 10, 2013 at 5:24 AM, Jesse Gross <jesse at nicira.com> wrote:

> On Thu, May 9, 2013 at 5:23 AM, Kris zhang <zhang.kris at gmail.com> wrote:
> > Hi guys,
> >
> > I use ovs 1.7, and i created a br0, and then add a fake bridge br100
> > (tag=100) on br0:
> > ovs-vsctl add-br br0
> > ovs-vsctl add-br br100 br0 100
> > ovs-vsctl add-port br0 eth0
> > ovs-vsctl add-port br100 tap-test
> >
> > Now it works ok. After a while i deleted the br100:
> > ovs-vsctl del-br br100
> >
> > There is a system log:
> > kernel: unregister_netdevice: waiting for br100 to become free. Usage
> > count=1
> >
> > this error log cannot stop. If i try to reboot the host, the error log
> block
> > rebooting. how to fix this issue?
>
> This is a symptom of a subsystem holding a reference on a device and
> not releasing it. In many cases, OVS could be such as subsystem that
> takes references, however, in this case OVS is the owner/creator of
> the device and therefore doesn't need an extra reference. What are you
> using this device for?
>
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