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Wed, 13 Jan 2021 12:29:49 +0000 Received: from VI1PR0402MB3359.eurprd04.prod.outlook.com ([fe80::9c1d:89de:a08e:ccc9]) by VI1PR0402MB3359.eurprd04.prod.outlook.com ([fe80::9c1d:89de:a08e:ccc9%3]) with mapi id 15.20.3742.012; Wed, 13 Jan 2021 12:29:49 +0000 From: =?utf-8?Q?Aur=C3=A9lien?= Aptel To: Duncan Findlay , linux-cifs@vger.kernel.org Subject: Re: [bug report] Inconsistent state with CIFS mount after interrupted process in Linux 5.10 In-Reply-To: References: Date: Wed, 13 Jan 2021 13:29:47 +0100 Message-ID: <87ft35kojo.fsf@suse.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [2003:fa:705:9f69:1ef8:3a2c:dccb:e3f5] X-ClientProxiedBy: ZRAP278CA0001.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::11) To VI1PR0402MB3359.eurprd04.prod.outlook.com (2603:10a6:803:3::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (2003:fa:705:9f69:1ef8:3a2c:dccb:e3f5) by ZRAP278CA0001.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3763.10 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: =?utf-8?B?MFNHcDVvMkFtRlF4VWhoV2IrM29XLzM2cDZJK1N5L0lnUEJRWVV3dWpvUnZS?= =?utf-8?B?dHY2Y2dSTTdRVGpLdWZtMVoxL1kwZDFUc24yREU0aW9uL2MvVUNFUGQ2Q2ZW?= =?utf-8?B?bnFid1U2aXJZMWw0Wnp6dFZpYlArd0IyQk9pQUtFZ01JSDUza01icVhZeFNm?= =?utf-8?B?RGtIeW1DV2kyMCs4ZEh0Rml3ZDVKb21aRTMzS05mblk0MkdHTFBENGRDQlV4?= =?utf-8?B?MGFXYWZycG5iM2hrY3pjWDg2UUh2SmVEMnNOOWVhQUxKUVVyVC82akdDdWVS?= =?utf-8?B?bVRoQmdmRXlZeEtOeUZkaFhKYSs5aTFRN1pxQ2ZiUEUzLzQyYnhJdituT1c4?= =?utf-8?B?TGxNRWhaL2lMYzI3cFkzclhSMXYrekxWcFQvV3Rjbk1BbWdpa25TS1NUdi9T?= =?utf-8?B?UUdBaWRkRURCTGlTRkVBUHNSUW9wT1dWT29kaHh4aktxV3ZtL1NvZTY1R2Z5?= =?utf-8?B?cmJsQyt5K1p2cW9rU1p1RUdYS1dCRXV3eHd5c2RJaVhUd2dZeW5XdElaaE1J?= =?utf-8?B?ZlphQ1hxU0RVVVowd0dBRTZNOTJvN3liUElmTGdZQzVVOTVYV1laNENTTHkz?= =?utf-8?B?Ym1KT3B6V2dxSjY2MHl1djBaUVgzVmcvc3RyZ2NobllnNXc0dXZ2dWpMM3R3?= =?utf-8?B?dmppc1NLMVd1c2pydzZBNXNyUnpkUXAwdTlNaXNxVlVwem9NWkxuZTVlcnVj?= =?utf-8?B?MW9CbTlLemUzbS84KzUvdVUvdVV5MlhCalhzRzBPeWdtSUxreThvQUE5djI4?= =?utf-8?B?VWEwR3A1ZVB6eTZuWjZpdnQrajRBS2VFc3hOMnl6UnhIb3N3RXZkaHNNMC9m?= =?utf-8?B?UVBPSUt4UzJBSHU3MjRjdUkrQ0xpRnRmV0h5SU9YV1ZYOWk1b0xlbUdPU05y?= =?utf-8?B?aFpkdDErbklsT1RBajFwUC81Ulc5V2J0QnJyckoxRFF1L3JWbEhhZ2dyY2p6?= =?utf-8?B?K1AwTDJyKzk0NTBKOVIzeXRvYVF5bERPUmtPZ3EyL0FhdEdtSUhhYzBBNXNI?= =?utf-8?B?YTl5bXZFMTlCUXVPNkdPN01ZTXlsODlDMnVRaXd3Q0M5K1F3M2NTUkQzcFBj?= =?utf-8?B?Mm9CcGJ3SklzVnp3UElTelJTcVhLN1phc3BXV0pQakgvQm1ETVZtMlRwc2gx?= =?utf-8?B?T1pSOFE2cUdZdXpqWnlUaXhKMmY5ck9ZR29HU3dMOENlZXZIVWN2Q3NxQ1Na?= =?utf-8?B?NnMzMmExdFpySWFSbUVJODBGR3N0VWExRXVuTTNkbjUzWTd3aUM5Qkg3OUVv?= =?utf-8?B?d2Jad29nNDkzR0lIZzB0cUhTaVh6U1BpT0ViTEl3Mk4rWDFNQm5zSkJWY0dG?= =?utf-8?B?WnNsSGJpVG00dzFuYlQwcXAwdVRrdTRlQUsxc05sVDBLZjdYSjgxNlp2aVRY?= =?utf-8?Q?802AVEvNVX1f0qJCUhUb/WQ8CTA1IIlA=3D?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-AuthSource: VI1PR0402MB3359.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jan 2021 12:29:49.1264 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-Network-Message-Id: 5148ec05-df32-4a58-f225-08d8b7beeb8b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 3CbvqqSTCIYkYnBW0mWFcp7Q9lCOVZ3TstLkLNBYBbIW9ES/3s6DAFF6fbBVLv9p X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0402MB3358 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Duncan Findlay writes: > There seems to be a problem with the CIFS module in Linux 5.10. Files > that are opened and not cleanly closed end up in an inconsistent > state. This can be triggered by writing to a file and interrupting the > writer with Ctrl-C. Once this happens, attempting to delete the file > causes access to the mount to hang. Afterwards, the files are visible > to ls, but cannot be accessed or deleted. > > I'm running Debian unstable with a Debian unstable kernel > (5.10.5-1). I attempted to but could not reproduce this with a 4.19 kerne= l. > > > Repro steps: > > $ sudo mount -t cifs //test/share /mnt/test --verbose -o > rw,user,auto,nosuid,uid=3Duser,gid=3Duser,vers=3D3.1.1,credentials=3D/hom= e/user/tmp/creds > $ mkdir /mnt/test/subdir > $ cat > /mnt/test/subdir/foo > [ Hit Ctrl-C to interrupt ] > $ ls /mnt/test/subdir/ > foo > $ rm /mnt/test/subdir/foo > [ Hangs for 35 seconds, errors in dmesg log -- see below ] > $ ls /mnt/test/subdir/ > foo > $ stat /mnt/test/subdir/foo > stat: cannot statx '/mnt/test/subdir/foo': No such file or directory > > At this point, the file still exists on the server side, and > restarting the server causes it to be deleted. > > I can provide pcaps if necessary. It looks like with 4.19, when the > cat command is killed, the client sends a Close Request, and on 5.10 > no commands are sent. I can reproduce this on Steve's current for-next branch but only against a Samba server. On Windows server, doing ^C kills cat properly but the output file is never created, which is also a bug. Cheers, --=20 Aur=C3=A9lien Aptel / SUSE Labs Samba Team GPG: 1839 CB5F 9F5B FB9B AA97 8C99 03C8 A49B 521B D5D3 SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 N=C3=BCrnberg, D= E GF: Felix Imend=C3=B6rffer, Mary Higgins, Sri Rasiah HRB 247165 (AG M=C3=BC= nchen)