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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2025 13:49:43.4804 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cd6569b5-250d-492a-4d3a-08ddbd5d20c2 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF0001C714.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB6515 Hi Sebastian, > On 2025-07-07 09:33:54 [+0100], Yeoreum Yun wrote: > > Hi Sebastian, > Hi, > > > > what is DEPT? > > > > Please check the below patchset: > > https://lore.kernel.org/all/20250519091826.19752-1-byungchul@sk.com/ > > Thank you. > > Would lockdep see this if check_region_inline() would have something > like (minus missing exports, just illustrate the idea) > > diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c > index d54e89f8c3e76..c74e8e0863723 100644 > --- a/mm/kasan/generic.c > +++ b/mm/kasan/generic.c > @@ -171,6 +171,11 @@ static __always_inline bool check_region_inline(const void *addr, > if (unlikely(size == 0)) > return true; > > + { > + struct vmap_node *vn = vn = &vmap_nodes[0]; > + might_lock(vn->busy.lock); > + } > + > if (unlikely(addr + size < addr)) > return !kasan_report(addr, size, write, ret_ip); > > > ? Just to understand if lockdep is missing something essential or if > DEPT was simply enabled why this "bad" accessed occurred and was able to > see the lock chain which otherwise stays invisible. No. I think lockdep could print this error situation without this patch. Since lockdep prints other cycle in test enviroment. I've attached the DEPT report. Thanks. -- Sincerely, Yeoreum Yun