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b=YPbQoZLgPhVzg3mmAVL2Zo2Ik+BZGT9bk4HgtEZ8USm+JxSjt2VHEsJpo8C/qKU09hXDMk2C//ahL8bdNoJrhm1erxNJHA4epPCDyPQLdbIFhjWPHRaNSOavV17zXpzHu3kpBgri+K9jD8NZBMh4RRaJIPnxLtA2j3u7XucrHHA= Received: from BYAPR21MB1270.namprd21.prod.outlook.com (2603:10b6:a03:105::15) by SJ0PR21MB1904.namprd21.prod.outlook.com (2603:10b6:a03:2a3::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4734.5; Thu, 18 Nov 2021 03:42:27 +0000 Received: from BYAPR21MB1270.namprd21.prod.outlook.com ([fe80::9c8a:6cab:68a6:ceb1]) by BYAPR21MB1270.namprd21.prod.outlook.com ([fe80::9c8a:6cab:68a6:ceb1%6]) with mapi id 15.20.4690.027; Thu, 18 Nov 2021 03:42:26 +0000 From: Dexuan Cui To: =?iso-8859-2?Q?Krzysztof_Wilczy=F1ski?= , Dexuan-Linux Cui CC: =?iso-8859-2?Q?Pali_Roh=E1r?= , Koen Vandeputte , =?iso-8859-2?Q?Petr_=A9tetiar?= , Bjorn Helgaas , Bjorn Helgaas , "linux-pci@vger.kernel.org" , Linux Kernel Mailing List , Lorenzo Pieralisi , Gregory Clement , Andrew Lunn , Yinghai Lu , Sasha Levin Subject: RE: PCI: Race condition in pci_create_sysfs_dev_files Thread-Topic: PCI: Race condition in pci_create_sysfs_dev_files Thread-Index: AQHX3CnqULJOBTs74EqXgrLyisbIKqwIotWw Date: Thu, 18 Nov 2021 03:42:26 +0000 Message-ID: References: <20200909112850.hbtgkvwqy2rlixst@pali> <20201006222222.GA3221382@bjorn-Precision-5520> <20201007081227.d6f6otfsnmlgvegi@pali> <20210407142538.GA12387@meh.true.cz> <20210407145147.bvtubdmz4k6nulf7@pali> <20210407153041.GA17046@meh.true.cz> <20210625115402.jwga35xmknmo4vdk@pali> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ActionId=478d128c-986d-449c-8b54-2fbed62c1b8a;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ContentBits=0;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=true;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Method=Standard;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=Internal;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2021-11-18T03:37:15Z;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; 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charset="iso-8859-2" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR21MB1270.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3c988ed4-26ec-4033-07b8-08d9aa45708d X-MS-Exchange-CrossTenant-originalarrivaltime: 18 Nov 2021 03:42:26.5872 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: VMgrri0kL9LlTSGTeuIPMdngZoeXPbIB/ZSox6O1F4Q9kuDFYfsoQRKjtJonb99oy7EjspiECF9eqCw38MN5RA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR21MB1904 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > From: Krzysztof Wilczy=F1ski > Sent: Wednesday, November 17, 2021 7:10 PM > [...] > > I think we're seeing the same issue with a Linux VM on Hyper-V. >=20 > Are you still seeing this issue happen? If so, does it happen often? This doesn't happen often. It's found by our test team. > We haven't had a report from a system that runs as a hypervisor guest > before. I also assume this is x86 or x86_64 platform, correct? Yes, x86_64. =20 > > Here the kernel is ... > > > This is quite an old kernel, however the 5.4 is a long-term kernel, and > therefore we need to make sure that it would also work properly. >=20 > > > '/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/475 > 05500-0003-0000-3130-444531334632/pci0003:00/0003:00:00.0/config' >=20 > Following the commit e1d3f3268b0e ("PCI/sysfs: Convert "config" to static > attribute"), the issue particularly with the "config" attribute should be > resolved, thus more modern kernel versions are no long suffer from the ra= ce > condition related to this specific and some other problematic attributes. Thanks for sharing the commit info! It's great to know this has been fixed in the mainlinekernel. > We quite likely have to back-port these changes to a number of older > long-term kernels. I am going to look into it. Sounds good! Thank you, Krzysztof! > Hopefully, once the patches land in upstream long-term kernels, then > distributions would be able to cherry-pick them and apply to their kernel= s > releases. >=20 > Krzysztof Yes, this should work. Thanks, -- Dexuan