From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9FD64C77B7C for ; Wed, 2 Jul 2025 16:05:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 176136B00D5; Wed, 2 Jul 2025 12:05:33 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0FF4B6B00D6; Wed, 2 Jul 2025 12:05:33 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EE2466B00D7; Wed, 2 Jul 2025 12:05:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id D71E36B00D5 for ; Wed, 2 Jul 2025 12:05:32 -0400 (EDT) Received: from smtpin30.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 792851231BD for ; Wed, 2 Jul 2025 16:05:32 +0000 (UTC) X-FDA: 83619799704.30.35ED6AD Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11010071.outbound.protection.outlook.com [52.101.84.71]) by imf29.hostedemail.com (Postfix) with ESMTP id 9B0F6120014 for ; Wed, 2 Jul 2025 16:05:28 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=arm.com header.s=selector1 header.b=lhWWobyM; dkim=pass header.d=arm.com header.s=selector1 header.b=lhWWobyM; spf=pass (imf29.hostedemail.com: domain of YeoReum.Yun@arm.com designates 52.101.84.71 as permitted sender) smtp.mailfrom=YeoReum.Yun@arm.com; dmarc=pass (policy=none) header.from=arm.com; arc=pass ("microsoft.com:s=arcselector10001:i=2") ARC-Message-Signature: i=3; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1751472329; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Jd0LN4d76BfimfewCr+2SSbA5uUsl+ULDX/iasFx/50=; b=gGIiFYTTaAmfDhsb5eN1H77gP7npAnJZcJus08XCgxXhJBmW0MYSTa0/FBsDIrwjRm4Eq+ YioeZNhU6YlPi2nckn8YY9Sz/plOI134pUXCbmGpe2uOcZXOGSQQNrWwTWOZBNlEPUKRKe FpicTopNNiN+sMS4pgPmaal+GXyzHu4= ARC-Authentication-Results: i=3; imf29.hostedemail.com; dkim=pass header.d=arm.com header.s=selector1 header.b=lhWWobyM; dkim=pass header.d=arm.com header.s=selector1 header.b=lhWWobyM; spf=pass (imf29.hostedemail.com: domain of YeoReum.Yun@arm.com designates 52.101.84.71 as permitted sender) smtp.mailfrom=YeoReum.Yun@arm.com; dmarc=pass (policy=none) header.from=arm.com; arc=pass ("microsoft.com:s=arcselector10001:i=2") ARC-Seal: i=3; s=arc-20220608; d=hostedemail.com; t=1751472329; a=rsa-sha256; cv=pass; b=QrkjIrOFWnqXK0eempQ8bsJyEpzSETQ6pKxgI9IDg2awjdbJ0A4+B7t5tgLMlF1v4nGpxJ ABZsJoaANpPoFHnmtDsGoCzSdI67ysA7zLtdTf8l8kOAmzR+L+XNfYDY2Fl8SFuu9qz3wR Z6hqnLqlhPQwaD6/25oc4Nw4jdNvFAo= ARC-Seal: i=2; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=pass; b=i6k3kjRafHN7ratnEM5ga3dN9NgDcfabAQMYCdvyGMl9zoklLt7CsL1hDJ0+VtGFn6ub1W8lV91Q6sPMya7Am/3inQ0lodR674ycP6VLl1CM9wTYaNmWQM8hiLdGxR4uFsB8HTXhf5FAAwwpzV6DavWKsPoA6C/dMTw73k0lV5zBl7NXJkmWGrveRka5TvsazeDK7eOXo9Zjgem7TR6EF6KsfvPlWBZXkfXZAdt02ZGC7Mi3rl668+Fa0SjHU1ffUzTlTM4AizLcevemeQaA3nUfuN5zBwTuczEKuAbBN8zElMhLG7Oviqm90SyTXZ6iTZFWokZqcmnvjks7T7UUOw== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Jd0LN4d76BfimfewCr+2SSbA5uUsl+ULDX/iasFx/50=; b=VmjNteDw2hxoYL/9WFFT91ycBMtw0jD8MO+h+IzLsZ7QaNO3BH+DpA/gJbSJnt/UlzMGGFnTAmjkoXoKwEVSUbXzFVK93paCt5ZE+/DrSzvptNdovCXx0+Sxnjm423Sq4Rii8xYMTIXZSmy0B+0d2aMX8+cHIJkovH9am/LpTBaTwUpX59QQZzNrtL0IHog4U2HYqnqrtc9YudwjCfUlc7Gc2569foKtNT5v9O5Gh36qnOP+SxudAJZOZN/ipZuFnW2I22RYYCLi4xTQLwVCqgWgzmGL7/lM+0DwsyqV593hpyB3ZuGHbMayZtovGDzf7gc+ZXseK/dFycp9hySSOA== ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 4.158.2.129) smtp.rcpttodomain=gmail.com smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=pass (signature was verified) header.d=arm.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=arm.com] dkim=[1,1,header.d=arm.com] dmarc=[1,1,header.from=arm.com]) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arm.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Jd0LN4d76BfimfewCr+2SSbA5uUsl+ULDX/iasFx/50=; b=lhWWobyMv6N1rgVFigcbnejdbj0GCygAH1gKkHngM+Dm/tf6PHtjPchCT60+WUafFuNOCP606UuMPs6uIMdy3frvqINs2ezaLdkjjwpSqQGPtL2a/wu/t4PmvrXD9LsHeXUf95DPfGh8GdMj5RPOqMYbmt55rdyW+/pHzas/HIs= Received: from DU2P251CA0003.EURP251.PROD.OUTLOOK.COM (2603:10a6:10:230::13) by AS8PR08MB8734.eurprd08.prod.outlook.com (2603:10a6:20b:564::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8901.19; Wed, 2 Jul 2025 16:05:24 +0000 Received: from DB5PEPF00014B8D.eurprd02.prod.outlook.com (2603:10a6:10:230:cafe::f8) by DU2P251CA0003.outlook.office365.com (2603:10a6:10:230::13) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8880.32 via Frontend Transport; Wed, 2 Jul 2025 16:05:24 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 4.158.2.129) smtp.mailfrom=arm.com; dkim=pass (signature was verified) header.d=arm.com;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 4.158.2.129 as permitted sender) receiver=protection.outlook.com; client-ip=4.158.2.129; helo=outbound-uk1.az.dlp.m.darktrace.com; pr=C Received: from outbound-uk1.az.dlp.m.darktrace.com (4.158.2.129) by DB5PEPF00014B8D.mail.protection.outlook.com (10.167.8.201) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8901.15 via Frontend Transport; Wed, 2 Jul 2025 16:05:23 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=kR9wqnZ4tMuqnXEzyn9/Nl+FSsimlXtQ0yLgJR4s6OHoLQJPSXGlefIFrLL7fmGrvfY1j52hsW+IJ7U7VisCZoZ1lJIey0mpwxXtGAI5H4K/eLvb+DRC0sbCjhtXq28cT43pmsbtHEY2S0BiXOqHkItA1yHG7/NpUgMNxo2CNUZZ1YS3caqMbm5RizIK0fPMGM+Q81TKAWYonfZrm7pwiUGqBB2XGzyZAJzqlAb5+2q8fqKgFGF12LVSAmTPOS60110yXeff+MGMd+rTXi2uIRdMiVKAgIcT2AFXdXCYEC3p386pbOlkVcAK015qQCIrxvo7v+22xuO1t9zV+N5QRQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Jd0LN4d76BfimfewCr+2SSbA5uUsl+ULDX/iasFx/50=; b=PXa+xpFyZuOe7GMwO++SFf/VGDHY0CFHCLBeG+16Gpgu3S4RWvisqYnaKCgsqy35qyD+RTJU6Y0FZc8Zvr0HSOkpXJWBuoTJRpigFvNZ3V0EOce1Xazr/3TsiKQEZNllUaRbC0S/NieFqgxcYWh4LueY2/P4IRgd7PRYt2o8OazR6yiqd49j42yVzWPQlf6VO0aWVTT5E1TjFkSKwEWxIO1LPvHUEt/LVLhlZke9gdi8GYetCZfVKWCmiH/C3O3og1vQ+R4fj3zQvhioFXXmUpnD1mQj9BHaQtTfOcNzSJ++gyMkvpkluDqwelyKjQK2dK8V1/ul9a/2jjrxF8dmNw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arm.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=Jd0LN4d76BfimfewCr+2SSbA5uUsl+ULDX/iasFx/50=; b=lhWWobyMv6N1rgVFigcbnejdbj0GCygAH1gKkHngM+Dm/tf6PHtjPchCT60+WUafFuNOCP606UuMPs6uIMdy3frvqINs2ezaLdkjjwpSqQGPtL2a/wu/t4PmvrXD9LsHeXUf95DPfGh8GdMj5RPOqMYbmt55rdyW+/pHzas/HIs= Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Received: from GV1PR08MB10521.eurprd08.prod.outlook.com (2603:10a6:150:163::20) by DU2PR08MB10015.eurprd08.prod.outlook.com (2603:10a6:10:49f::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8880.31; Wed, 2 Jul 2025 16:04:51 +0000 Received: from GV1PR08MB10521.eurprd08.prod.outlook.com ([fe80::d430:4ef9:b30b:c739]) by GV1PR08MB10521.eurprd08.prod.outlook.com ([fe80::d430:4ef9:b30b:c739%5]) with mapi id 15.20.8880.027; Wed, 2 Jul 2025 16:04:51 +0000 Date: Wed, 2 Jul 2025 17:04:48 +0100 From: Yeoreum Yun To: Andrey Ryabinin Cc: glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, bigeasy@linutronix.de, clrkwllms@kernel.org, rostedt@goodmis.org, byungchul@sk.com, max.byungchul.park@gmail.com, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Yunseong Kim Subject: Re: [PATCH] kasan: don't call find_vm_area() in in_interrupt() for possible deadlock Message-ID: References: <20250701203545.216719-1-yeoreum.yun@arm.com> <4599f645-f79c-4cce-b686-494428bb9e2a@gmail.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4599f645-f79c-4cce-b686-494428bb9e2a@gmail.com> X-ClientProxiedBy: LO6P265CA0017.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:2ff::8) To GV1PR08MB10521.eurprd08.prod.outlook.com (2603:10a6:150:163::20) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: GV1PR08MB10521:EE_|DU2PR08MB10015:EE_|DB5PEPF00014B8D:EE_|AS8PR08MB8734:EE_ X-MS-Office365-Filtering-Correlation-Id: 6b2232ac-cbf8-418f-1c45-08ddb98240a9 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; X-Microsoft-Antispam-Message-Info-Original: =?us-ascii?Q?mxJOFFoUpaiH0+gEhPOjVxZLD9N16j3Gyy5sbhS88NQfKUQBN2DZ81zbcWtv?= =?us-ascii?Q?e6U3OthCPByhRRvaJRhugwzQR+7COWrTGWgzA5vXWh6C+9cFwQJcKLNVZKgG?= =?us-ascii?Q?gcvwhO9KqtfgwR0vcq0FGn458Oxjj8X7j5bqrOj9tZlzXyE+3ZnMAn1KjMMS?= =?us-ascii?Q?lqikCvOclBwqZ8Q1qwDkhtQObsaTu/EqQvMsrRYdZAsA5Bx7isOdIb7/Sm2B?= =?us-ascii?Q?AUjYEjmMc6UvrvGbH8xlnZCVKrj8TjY8lIOsG4hHt23MrSe2ukZRq+g0RZFd?= =?us-ascii?Q?2cSXpfUbZfB7/MGj2TnO+KZs0EVwLjLeGjpwZtfBRVYBB0HNCpLDgxNt0uUI?= =?us-ascii?Q?yGugdg0k4Y1vp/3e5Nh4+YfNQrUKWas9Dh8ZyuXftuSwlv50tRS+8BkSEHSj?= =?us-ascii?Q?Fb326GgrBBbT5tsLl5xJrH0uz6zX7HUL7csCGfsq8dh1iJSOh4jfCLMpMJUM?= =?us-ascii?Q?n4uKQALldfO8u15rHSAWJ872hNsNSi2nwSCJzQXvRkmNwqsJ485uL3j6e+fc?= =?us-ascii?Q?LwUkttoaG8CxI9XnF9fws/MREYnAjUrMceYRsT2nEF4vG/lh8YrP7suIaUNC?= =?us-ascii?Q?kUwwXNel6PTaay3J1GJzFt4WE1RrMoztJPHX5XxjDpk1qOYGo9uMFsj2ienj?= =?us-ascii?Q?DCUlEKkJiBvNEtZ+9OlEJFsJZcVQ2umyrlhgJZb5yFfRluGLp/u/3iCziT3m?= =?us-ascii?Q?NWD9kjKtpNmpevSOrwdfM43D2ZP/tDSu+YjVmus+R0lD9VMiMqIzeKGA0B5t?= =?us-ascii?Q?vUn8PU1s5+iAEtK0ktQmAiQHMYCSnHC2thE6HmEfXIRLSMDUgJ8zSxnwiRvQ?= =?us-ascii?Q?zCwNiIGdSDgl8bhNAekWqemBmMRYkDFVlixljvHbZKVk0zQ9irSGl/hJhOHi?= =?us-ascii?Q?fm6iKXlkBLp7L17x51RUuYzI7+LRT0zPFgnUO0ial9bezmxYXzCiuvTCnU/F?= =?us-ascii?Q?AoMVz1IPT4JNm0gyVvS1s7c1M8tPpvmi/9H9ilz7ub7BXDU8R0T7IFKUyd6O?= =?us-ascii?Q?2E3JRV3IJIlJg+9LQeeMor1P2vc6ncaHW/Z6cTEyUGYIMV7TGbV56LqIoH+Y?= =?us-ascii?Q?j4VSFkLHj/QosyX0Cn7U8zrTUb+YPCKEE5c52nVHk30ZwjU2f4QQkgbbgZpR?= =?us-ascii?Q?Si+TtElxFiiv1/AUiN8zyKh5lr68i0UJGhM0HdjOc4ts++ZtxGAraPIctx69?= =?us-ascii?Q?vtZo64raML/suz7oJvFhn/L+iz9DOiylkgULSz7dlHN26/5KLwMNhf24C2ur?= =?us-ascii?Q?E5goU2CSV6VfjEz452kt9KlJ4Wt7maCZrajLN7FCo4H029wtYiqCk2hBYb6k?= =?us-ascii?Q?2reWJuRhCVWqcVCYlI1ihkLHHKPha6vZgtHgZ5lVWBKfrdIYwVTrNlhkbwQM?= =?us-ascii?Q?74Ce/q2llL7FKYqhiHhwqUnWmTTe8HHQHPle2ZxAQGQFmEqRUPi1UwAiSyho?= =?us-ascii?Q?5dc4QIvUL0U=3D?= X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:GV1PR08MB10521.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(376014)(7416014);DIR:OUT;SFP:1101; X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU2PR08MB10015 X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: DB5PEPF00014B8D.eurprd02.prod.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: 975ee4ef-1a50-4fef-f05c-08ddb9822d14 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|14060799003|376014|7416014|35042699022; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?7/Dl+0HiEo+vPnpnLAWaudZnccKWR7p91c02fFU3Ujo8Dm6UDYn2lNa4KoqG?= =?us-ascii?Q?9offP250V4xlLsa0Cd5IPsC+/s7jNEQgBL97xv80JlMewCcxEPLGwuelQZ0d?= =?us-ascii?Q?OXCgGJ/GCl6NI0H17K4+FkJJ9NVgg/Yq5ZcRD8rPFOR32RvtKxoDOFw+cnOx?= =?us-ascii?Q?3JM5eiHdpxFXBjKTSaJL6kO0mRZWm18Fkax7z9fRLN0jHzQQGyrQyXoQFFGG?= =?us-ascii?Q?YGQmCcsBDABXGBaed8cr260+jA6T5f2hNIVZU3TYiwWNthX6KnlLRQ91N/my?= =?us-ascii?Q?YV7C0zdKxf9SHP7SvNLveO2pS193jZiXRvnx9m/D+eWmD4c54qesV/3MlPGu?= =?us-ascii?Q?0QeyJeZvKBZjCvh3SlWflrXnxhgw6od19UbevZ2rJKrvRRcP+t6Fib8uqacJ?= =?us-ascii?Q?kUCWJeHPFOqxQEUepq9TdwKDM80AFrRg31SkezH+yZOU32jNn8W+KrebpmIb?= =?us-ascii?Q?CNYwOdvCBFkIBhERBEtAqVWUKDVkWSCsNXWLgx5LsVrbkFk/gxENwHSRtcv8?= =?us-ascii?Q?QprAe4gy38OcAGVIb7QJdd8vc/JZ/lcCfW8P8VWtql1O+KtlHd651ZsZvT/7?= =?us-ascii?Q?xS26O6cg839DkXJl7+0tiPaL73Yar5RyahestDq6jvX10sN//Tq/diWjcCag?= =?us-ascii?Q?96u4OV1NhV1MYPvXNMM1Cf15MRSBWLz6MnL7W7bJcYjeYZZq8srgNeex7gLY?= =?us-ascii?Q?Ddl87vTIHuqGCcz7hVvG7PCvbokn/S1K18fLq6gHH4Ng20ZOUOgV9IU9198D?= =?us-ascii?Q?PN1YPeAEpDA+8IXLsvo3A+puWfpiokejA9e1iEh7oJbj/XdM98aZxyCziwUI?= =?us-ascii?Q?UOCdO8KZTSXqFrSg1+Y7XNhBCZyGPey8hFk+Tt/Qk1KPQz8pGRzEX851wJ4z?= =?us-ascii?Q?5WAOBp9VHN02tzA9fbVhx06WLv0wxvK9isCkHUOCbQc3RPUFK7AWz99CRPhK?= =?us-ascii?Q?slqziZmNxzMF9IWz8et//M4IN6/vpwbJMO5umq7EdnE5sMQVqGqXmHkGYrCM?= =?us-ascii?Q?HwDGUHFsTIWeN9tR8XFrOU7g5P5MtV13mCJFlBc9LmcqLpY+wmDaGE7iZFLJ?= =?us-ascii?Q?umfvrgnReUV2vAzrKoOFZVUavJqlvw05uliylk++xKOb20Dm6UM2ixL+Y3tZ?= =?us-ascii?Q?MmMumEv/YurD0MmGWC8t+yjhNPlgdfFVY2kiuV4B6og6DLFn1CJjRntAA/7B?= =?us-ascii?Q?zr7N8iy4kLY25XS31jrnnqf97Df8QpSsPaL6v5aMjCVKQuQY5vckvuaBLEQs?= =?us-ascii?Q?/0K4ZFGSndRVBgDcgeVs/g6dMLp0dyVA2IRTyNUVvHO70xI87DNaJ8R8WKa8?= =?us-ascii?Q?RUdNj/m8woseuLZBnuLdoGaKprZwOvGKzbdLsp30J+2fPtxHIMgx0qpfh6mL?= =?us-ascii?Q?taMn50za8N8rJBvz2M+KzsHvlaDN0K3P/y+7V1g8kW8uNiUEIK9kEZ1CR2SM?= =?us-ascii?Q?89FDNByzpyBgUDAhEK3H4hGPVmwf0otH3gTLR4CFWKjoJHYNkWF6Ig2StMty?= =?us-ascii?Q?LCIi0FKwMcTZW1USuvAwcWtSNDBHcD/Lams5?= X-Forefront-Antispam-Report: CIP:4.158.2.129;CTRY:GB;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:outbound-uk1.az.dlp.m.darktrace.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(14060799003)(376014)(7416014)(35042699022);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jul 2025 16:05:23.7228 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6b2232ac-cbf8-418f-1c45-08ddb98240a9 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: DB5PEPF00014B8D.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8734 X-Stat-Signature: 5c4dkzxx5pw1tt3dt98gjefetz45aghq X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 9B0F6120014 X-Rspam-User: X-HE-Tag: 1751472328-618479 X-HE-Meta: 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 /2cFxvfK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 Andrey, > > FYI some of email addresses in CC look corrupted, e.g. "kpm@linux-foundation.org", "nd@arm.com" Sorry and Thanks to let me know :) > > > In below senario, kasan causes deadlock while reporting vm area informaion: > > > > CPU0 CPU1 > > vmalloc(); > > alloc_vmap_area(); > > spin_lock(&vn->busy.lock) > > spin_lock_bh(&some_lock); > > > > > > spin_lock(&some_lock); > > > > kasan_report(); > > print_report(); > > print_address_description(); > > kasan_find_vm_area(); > > find_vm_area(); > > spin_lock(&vn->busy.lock) // deadlock! > > > ... > > > diff --git a/mm/kasan/report.c b/mm/kasan/report.c > > index 8357e1a33699..61c590e8005e 100644 > > --- a/mm/kasan/report.c > > +++ b/mm/kasan/report.c > > @@ -387,7 +387,7 @@ static inline struct vm_struct *kasan_find_vm_area(void *addr) > > static DEFINE_WAIT_OVERRIDE_MAP(vmalloc_map, LD_WAIT_SLEEP); > > struct vm_struct *va; > > > > - if (IS_ENABLED(CONFIG_PREEMPT_RT)) > > + if (IS_ENABLED(CONFIG_PREEMPT_RT) || in_interrupt()) > > in_interrupt() returns true if BH disabled, so this indeed should avoid the deadlock. > However, it seems we have similar problem with 'spin_lock_irq[save](&some_lock)' case and > in_interrupt() check doesn't fix it. > And adding irqs_disabled() check wouldn't make sense because print_report() always > runs with irqs disabled. > I see no obvious way to fix this rather than remove find_vm_area() call completely and just > print less info. Right. unless there is API -- find_vm_area() with spin_trylock(), kasan_find_vm_area() should be removed. But, I'm not sure adding the new API used only bv kasan is better then just remove kasan_find_vm_area(). Do you have any idea for this? Thanks. -- Sincerely, Yeoreum Yun