linux-kernel - RE: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2

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Date:	Thu, 3 Mar 2016 05:25:58 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Jeremiah Mahler <jmmahler@...il.com>,
	David Ahern <dsa@...ulusnetworks.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for
 lo to become free. Usage count = 2

> Hi David,
> On Wed, Mar 02, 2016 at 01:00:21PM -0800, David Ahern wrote:
> > On 3/2/16 12:31 PM, Jeremiah Mahler wrote:
> > >>On Tue, Mar 01, 2016 at 08:11:54AM +0000, Dexuan Cui wrote:
> > >>>Hi, I got this line every 10 seconds with today's linux-next in a Hyper-V
> guest, even
> > >>>when I didn't configure any NIC for the guest:
> > >>>
> > >>>[   72.604249] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[   82.708170] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[   92.788079] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[  102.808132] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[  112.928166] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>[  122.952069] unregister_netdevice: waiting for lo to become free. Usage
> count = 2
> > >>>
> > >>>I don't think this is related to the underlying host, since it's related to "lo".
> >
> > This should fix it:
> > https://patchwork.ozlabs.org/patch/591102/
> 
> > David
> 
> That patch fixes the problem on my machine.
> Thanks for the quick fix :-)
> 
> - Jeremiah Mahler

This works for me too! Thanks!

Thanks,
-- Dexuan