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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <56D75465.4060705@cumulusnetworks.com>
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