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

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Date:	Wed, 2 Mar 2016 13:00:21 -0800
From:	David Ahern <dsa@...ulusnetworks.com>
To:	Jeremiah Mahler <jmmahler@...il.com>,
	Dexuan Cui <decui@...rosoft.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for
 lo to become free. Usage count = 2

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