netdev - Re: linux-next: next-20160301: unregister_netdevice: waiting for lo to become free. Usage count = 2

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Message-ID: <20160301200749.GA1611@hudson.localdomain>
Date:	Tue, 1 Mar 2016 12:07:49 -0800
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: Re: linux-next: next-20160301: unregister_netdevice: waiting for lo
 to become free. Usage count = 2

Hi all,

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 be a recent regression, as I remember the January linux-next didn't have
> this issue.
> 
> Any idea?
> 
> The gzip-ed kernel config is attached FYI.
> 
> Thanks,
> -- Dexuan
> 

Just a "me too", but I have this problem on a Lenovo Carbon X1 when
running linux-next 20160301.  It worked with 20160225.

I can test patches and I will try to bisect the problem as time allows.

-- 
- Jeremiah Mahler