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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jul 2025 06:29:00.3483 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d8f1812d-0108-4e59-2047-08ddb931bb5d 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: AM4PEPF00027A5D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB6506 Hi Byungchul, > > > > > > CPU0 CPU1 > > > vmalloc(); > > > alloc_vmap_area(); > > > spin_lock(&vn->busy.lock) > > ^ > > Here, it should be spin_lock_bh(&vn->busy.lock). > > spin_lock_irqsave(&vn->busy.lock) might be even better, assuming > find_vm_area() could be called with a critcal section of *_irq() or > something. Agree for this change and I also thought about it. But, I'm not sure changing to spin_lock_irqsave() is *better* since it makes a unexpected schedule delay whenever vmalloc_info_show() is called via proc. Also, I think the find_vm_area() is designed for task context not for atomic context. so it seems the misusage in the kasan. Am I missing something? Thanks. -- Sincerely, Yeoreum Yun