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Yadav" , , From: "Zi Yan" Subject: Re: [PATCH v2] mm/migrate_device: Clear stale mapping after freeing swapcache Cc: , , , , , , , , X-Mailer: aerc 0.21.0 References: <20260724082702.2531024-1-arvind.yadav@intel.com> In-Reply-To: <20260724082702.2531024-1-arvind.yadav@intel.com> X-ClientProxiedBy: BL1PR13CA0097.namprd13.prod.outlook.com (2603:10b6:208:2b9::12) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|CY8PR12MB7362:EE_ X-MS-Office365-Filtering-Correlation-Id: 45bd385e-1d02-486c-3423-08dee98bf831 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|23010399003|7416014|366016|1800799024|10067099003|56012099006|11063799006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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__migrate_device_pages() reads the folio mapping before calling > folio_free_swap(). When folio_free_swap() succeeds, the folio is removed > from the swap cache, but the saved mapping still points to swap_space. > > Passing the stale mapping to folio_migrate_mapping() makes it take the > mapped-folio path after the swapcache reference has been dropped. This ca= n > cause an invalid swap_space lock access followed by a folio reference > count BUG. > > Refresh the saved mapping after folio_free_swap() so the current folio > state is used during migration. > > v2: > - Refresh the mapping using folio_mapping(), as suggested by Zi Yan. > > Fixes: df263d9a7dff ("mm/migrate_device: try to handle swapcache pages") > Cc: Andrew Morton > Cc: David Hildenbrand > Cc: Matthew Brost > Cc: Joshua Hahn > Cc: Zi Yan > Cc: Rakie Kim > Cc: Byungchul Park > Cc: Gregory Price > Cc: Ying Huang > Cc: Alistair Popple > Signed-off-by: Arvind Yadav > --- > mm/migrate_device.c | 6 ++++++ > 1 file changed, 6 insertions(+) > LGTM. Thanks. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi