From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935991AbcHJSe0 (ORCPT ); Wed, 10 Aug 2016 14:34:26 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:5005 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933734AbcHJSeV (ORCPT ); Wed, 10 Aug 2016 14:34:21 -0400 Subject: Re: [lkp] [nfsd] b44061d0b9: BUG: Dentry ffff880027d7c540{i=1846f,n=0a} still in use (1) [unmount of btrfs vda] To: Linus Torvalds References: <20160810053947.GG21941@yexl-desktop> CC: kernel test robot , Al Viro , Chris Mason , David Sterba , "J. Bruce Fields" , LKML , LKP , linux-btrfs , Linux NFS Mailing List From: Josef Bacik Message-ID: Date: Wed, 10 Aug 2016 14:32:47 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [107.15.72.49] X-ClientProxiedBy: BN6PR07CA0044.namprd07.prod.outlook.com (10.172.104.30) To BN6PR15MB1315.namprd15.prod.outlook.com (10.172.206.141) X-MS-Office365-Filtering-Correlation-Id: fb0184df-5896-42b3-5a10-08d3c14cbbec X-Microsoft-Exchange-Diagnostics: 1;BN6PR15MB1315;2:KTdV++QJVUVgSL9bi/e/d/ZnXojKgqPXI9TFf8JVhhi0VZoBVI2tulzAQ6JzQfnwfstYhXDFFg8Jb2ep44bD2DHzuR/zvEdll9LGaK0J/19fX7EXp38fk1B8Q0yOKt8o3zFw+BIB+KOh/WA95SnA/W7Y4fXb3VAayX+eD6xoi0vNLxcIA3iuA7Zvluv6JO+d;3:ePrMqq19CDoTmjb6mjVNbfnnApCKWBPX8lIz5oZ+xGqMi1AQzn2UAEfFeDRc9T1pjO0RyHUxay9E5udvCcB2KOR2XClVHkVWY1mdARsXe6MyLRKBNJ5+OXg4yyfUITaR X-Microsoft-Antispam: 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X-Microsoft-Exchange-Diagnostics: 1;BN6PR15MB1315;20:fxQigKYLL81b5DAU9dSY49QLGBUbi7Ugd/Hzhqrf7IFFPVRUy9Vd0dfBz37grDDCuzpbJWKUYN1QJ+7me00oofoLavUuLeRAILuoTWAgHFsNPKoyXcQiPMkjb26nXUc6E4/9HuckMbnv9quqFLyFPtjwjdJIUJlBCYsTfTgF12k= X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2016 18:32:50.0363 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR15MB1315 X-OriginatorOrg: fb.com X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-08-10_14:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/10/2016 02:25 PM, Linus Torvalds wrote: > On Wed, Aug 10, 2016 at 11:22 AM, Josef Bacik wrote: >> On 08/10/2016 02:06 PM, Linus Torvalds wrote: >>> >>> More information in the original email on lkml. >> >> I'm not subscribed to lkml and for some reason I can't find the original >> email in any of the lkml/linux-nfs archives. Could you forward more of the >> details? > > Done. > Looks like an NFS problem. Before in the !resfhp->fh_dentry case we would do a lookup_one_len() and carry on. Now we do the lookup_one_len(), call into nfsd_create_locked() and do a dget on resfhp->f_dentry, which from looks of it is the dentry we just did a lookup_one_len() on, so we have one more ref on the dentry than we did previously. Thanks, Josef