Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751334AbcCCF0F (ORCPT ); Thu, 3 Mar 2016 00:26:05 -0500 Received: from mail-by2on0114.outbound.protection.outlook.com ([207.46.100.114]:41238 "EHLO na01-by2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751091AbcCCF0C convert rfc822-to-8bit (ORCPT ); Thu, 3 Mar 2016 00:26:02 -0500 From: Dexuan Cui To: Jeremiah Mahler , David Ahern CC: "netdev@vger.kernel.org" , Haiyang Zhang , "David S. Miller" , "linux-kernel@vger.kernel.org" Subject: RE: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2 Thread-Topic: [REGRESSION, bisect] net: ipv6: unregister_netdevice: waiting for lo to become free. Usage count = 2 Thread-Index: AQHRdQ0qGNXLHCYLrEC6kvEiyhJwzQ== Date: Thu, 3 Mar 2016 05:25:58 +0000 Message-ID: References: <6c735168f53548a39bd21e6e9857f512@HKXPR3004MB0088.064d.mgd.msft.net> <20160301200749.GA1611@hudson.localdomain> <20160302203150.GA2045@hudson.localdomain> <56D75465.4060705@cumulusnetworks.com> <20160303012324.GA1882@hudson.localdomain> In-Reply-To: <20160303012324.GA1882@hudson.localdomain> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=microsoft.com; x-originating-ip: [167.220.232.225] x-ms-office365-filtering-correlation-id: 11d5cab1-f9af-4cf6-5b82-08d343244d82 x-microsoft-exchange-diagnostics: 1;BY2PR0301MB0776;5:2nFjczJHast5O6oWZgZB7l04lKdHff10hZU37GR3dJBbDwy1KMTYS08XtiTqUnNCPyc6xiaCzrbMbjHcqlR7ucmdv0tpa5GyYA5G/58WdW+s0kZGvYqRS1DDH53QgAG2N0S+IalrZOQune6cQS38ag==;24:d2j+oiZIRKk4ADoSIv7CpM2e0BOyhlewK6b56yR9ECKCfynjOE/3szVq6zkcLCzcgvDdRH1Bw+usSS6oG5gtlQpi2RP6A8ilxJlj2yQ++/E= x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:BY2PR0301MB0776; x-microsoft-antispam-prvs: x-exchange-antispam-report-test: UriScan:; x-exchange-antispam-report-cfa-test: BCL:0;PCL:0;RULEID:(61425038)(601004)(2401047)(5005006)(8121501046)(3002001)(10201501046)(61426038)(61427038);SRVR:BY2PR0301MB0776;BCL:0;PCL:0;RULEID:;SRVR:BY2PR0301MB0776; x-forefront-prvs: 0870212862 x-forefront-antispam-report: SFV:NSPM;SFS:(10019020)(6009001)(479174004)(164054003)(24454002)(51914003)(377454003)(87936001)(102836003)(50986999)(106116001)(3660700001)(54356999)(189998001)(76176999)(5003600100002)(86362001)(3846002)(6116002)(76576001)(5002640100001)(2906002)(93886004)(66066001)(122556002)(5004730100002)(10400500002)(4326007)(33656002)(3280700002)(2900100001)(15975445007)(1096002)(74316001)(5008740100001)(92566002)(5005710100001)(5001960100004)(586003)(77096005)(8990500004)(86612001)(10090500001)(99286002)(2950100001)(10290500002)(19580395003)(5001770100001)(1220700001)(40100003);DIR:OUT;SFP:1102;SCL:1;SRVR:BY2PR0301MB0776;H:BLUPR03MB1410.namprd03.prod.outlook.com;FPR:;SPF:None;MLV:sfv;LANG:en; Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Mar 2016 05:25:58.6237 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR0301MB0776 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1242 Lines: 37 > 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