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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 X-Stat-Signature: j93kekh7fz57xwjcij66dkx85eydc73u X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: F2FA62000A X-HE-Tag: 1751896187-879185 X-HE-Meta: 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 HzltF/eO 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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