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[PATCH] mm/filemap: __filemap_add_folio() restore index before retrying Cc: "Kairui Song" , "Matthew Wilcox" , "Jan Kara" , "David Hildenbrand" , "Kiryl Shutsemau" , "Chris Arges" , , , To: "Hugh Dickins" , "Andrew Morton" From: "Zi Yan" X-Mailer: aerc 0.21.0 References: <562fbfa6-dd6d-0b6a-2461-ed2ff1173bc8@google.com> In-Reply-To: <562fbfa6-dd6d-0b6a-2461-ed2ff1173bc8@google.com> X-ClientProxiedBy: MN2PR20CA0046.namprd20.prod.outlook.com (2603:10b6:208:235::15) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|MW5PR12MB5684:EE_ X-MS-Office365-Filtering-Correlation-Id: 716cdb10-f207-4f11-7ac2-08deecbd065d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|23010399003|1800799024|56012099006|10067099003|11063799006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 716cdb10-f207-4f11-7ac2-08deecbd065d X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jul 2026 15:29:33.5763 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: d7dz2xnTOKb0NERFj0E+WyPym5j0+7iLzbd5ZLOEoMgCkqMiv0geHVXwitFwOJAI X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR12MB5684 X-Rspam-User: X-Rspamd-Queue-Id: E71A714000B X-Rspamd-Server: rspam01 X-Stat-Signature: nuxfzcwt9sy8xygqdtf5wb7z3kogjnqm X-HE-Tag: 1785252578-237061 X-HE-Meta: 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l5VB3DvxcmVxlSfvnR1N49pRy0FSs6rLqdou8YzwtSXYx6/siLuQa8YtULtgIzuOCL7+HGXK1oSoQT0+kCBzgD2DPmOVeDthHL3EejxzafjXoQ+zXrk8INvkzjAx79Te44EibUKjHG7AcSpjDr+zp28dxnDfEJMYRKE2IUBkhA/yHSFF7jeybHuC3dqYBnohwOpi8iCec2Bqj/9Ls1+aVVFJrqDKOccw5ReTfNMyNB/Xl57PI+B6wleyCf1WC2WT8gsxg27oRtasJtdCGh9a1zM8Z7BYbuoyUT57llLXCqA/LaNNNvoFSd9MRsi2iLTOBivgaB7gRcZ05p6gk8nUr74yNjEG0mJg91cnWsBIvUhxDCJIV7/GeRfhsONI8B8FGCFl7pF74Xci14Q+/MGnNOSX55ZJGbq80fRo4LPrYNQ7QBIgz5WSidNFRGZce65zXROSBUeXwYVYMiB/WRMR7g/aBjveX26in+LhuUhfU0ujEfnw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue Jul 28, 2026 at 1:24 AM EDT, Hugh Dickins wrote: > In __filemap_add_folio()'s split-a-conflict loop, xas_set_order() is > applied repeatedly: each application modifies xas.xa_index, rounding it > down according to the split_order attempted at that stage: and if all > goes as intended, it eventually (or immediately) converges on an > xas_try_split() to the required folio_order, with xas.xa_index now the > same as index: then xas_store() puts the new folio into the xarray there. > > But if a new node was needed, and GFP_NOWAIT allocation did not get one, > the lock is dropped, xas_nomem() used to allocate, and sequence retried. > If (that part of) the xarray is unchanged when the lock is reacquired, > no problem. But what if the conflict was meanwhile resolved by another > thread (perhaps even doing the same thing, inserting a folio at that same > index)? Isn't there a danger of now putting our folio into the xarray at > an intermediate rounded-down index? With !folio_contains() bug to follow, > when CONFIG_DEBUG_VM=3Dy is checking for that. > > Fix this with an xas_set_order() to restore the original xas.xa_index at > the bottom of the loop, so the retry does a full re-evaluation after > reacquiring the lock, and cannot reach xas_store() with the wrong index. > > Production was suffering from rare SIGILLs and SIGSEGVs, executable text > found a page away from where it belonged, !folio_contains() bug hit when > debug enabled: symptoms not seen since this patch went in. > > Fixes: 200a89c159a7 ("mm/filemap: use xas_try_split() in __filemap_add_fo= lio()") > Signed-off-by: Hugh Dickins > Cc: stable@vger.kernel.org > --- > mm/filemap.c | 6 ++++++ > 1 file changed, 6 insertions(+) > Thank you fro the fix. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi