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 61A55E6B240 for ; Fri, 1 Nov 2024 11:11:58 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id ECBF36B0082; Fri, 1 Nov 2024 07:11:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E7AE46B0083; Fri, 1 Nov 2024 07:11:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CF5726B0085; Fri, 1 Nov 2024 07:11:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id B06636B0082 for ; Fri, 1 Nov 2024 07:11:57 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 6BE4C1C77BD for ; Fri, 1 Nov 2024 11:11:57 +0000 (UTC) X-FDA: 82737261222.14.84C2661 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf02.hostedemail.com (Postfix) with ESMTP id B193F80026 for ; Fri, 1 Nov 2024 11:11:00 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b=NGISiOpO; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=pACQ3i9j; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf02.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1730459468; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=dOGFoKZR5O0+cxCWK/CarbYBq6AaWdQ9r/3XQX4yQN8=; b=RNk3r9alIjtlhim58oFq5LcRok0SYwg55eLwH5zLq3cEGDBdZam5YZVnNyWkYGJSBNlk6U yHKnNDPTslCYhvAzbFlmQ97gx5Tl2z9LO0xYu37dAIkOV9FZDJaef2+Fx4Fww3iAXclDtk PxVWpa+s+OUk1hkFBlTr9v1Yz7tHaJk= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1730459468; a=rsa-sha256; cv=pass; b=EyllGkUDlEuuwgN8TbFnpNSn2shRn71b2bf9x5APFh3LUXkmP2LJun3fRFzFI5fMbAndej ZvGmcRuhJpnGPRjNA6WnTm80PQ0F2AdPlqkDmyGivjg6YDcvxc4CLPOK22CB6Ejz7pcGHj snkt/oQTz52QnvcYQ4WisRD6hFkp9wQ= ARC-Authentication-Results: i=2; imf02.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b=NGISiOpO; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=pACQ3i9j; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf02.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com; dmarc=pass (policy=reject) header.from=oracle.com Received: from pps.filterd (m0246627.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4A18fd0F017192; Fri, 1 Nov 2024 11:11:50 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2023-11-20; bh=dOGFoKZR5O0+cxCWK/CarbYBq6AaWdQ9r/3XQX4yQN8=; b= NGISiOpO8NHH0glBIIo6INa2hPVujNTXneiRILuCa/BZKC9t+UDyscZBs948Zauq TbjlMDEnyCGWpc49xfJIaX2X7/1Z2BPfFfN1YUZhciEvmWFDhVdyXufNtyW3MN96 Q5oztKZrppH8jpBMF8Wv3l+Y+hxc2tawBLChmjeeLNEr1fYKucQDm9AmIrzGu9jY Fs7MqH2UGTKK4h/jUY2udH7INEGLWO/V4R85GnYdudZVrQyvorl8wOh6x2RhldEM ntJN+oAZ43522w3kW31248JWCy9EafYPWKFw0FLGeVNVu0GYIM6WQP/J0RoU2eoT mzyCFq2+WH2Q+B3u1poS2w== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42grc942k4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 01 Nov 2024 11:11:49 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 4A1A6AfW040616; Fri, 1 Nov 2024 11:11:49 GMT Received: from nam10-mw2-obe.outbound.protection.outlook.com (mail-mw2nam10lp2043.outbound.protection.outlook.com [104.47.55.43]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 42hnasu4x4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 01 Nov 2024 11:11:48 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=mBp1ljMFk/YvpVfqQqkobOOFKKKE9tlmTdn6D/PzyBf6O2GSSsgoXjEZL4wzeDB/Ly5alktUyIwgulog753TfJoYdpyRpmK8vZjLU3DkjI8u2/MfANRfVh7tkSGA6kS7CU0sBhhnouYmZO3xA8HNhtFAaA+l94SdpxbDymOdf0mSysn7q9+is/qidbvyGionRgbu13CvyHjbpOx6wpPOSX3Duo8eHoNlm8L3C7HQroG8Wedoe7Z1g/FjwRBga7Kkta1D82JW6KO3pjXUOAe3EI/X2hEA07o+ZyqT4PVTZbNslZY6QbQZjX5AvvLjTYveUhrKGzg2+tDId4nNd6+olA== 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=dOGFoKZR5O0+cxCWK/CarbYBq6AaWdQ9r/3XQX4yQN8=; b=xaizcA+OXiNcR92G4F9f/YdKWx39hG3wB0VLjow1Q+W6LN9a+sAbMVSzfub+UttZAmhr6Q2Dpm5ex84vWPHsH5oEtLShHzW+kJTxL7ShUVBKxXddrxEjTxf2j6vMVaB4eoFLNkEGY8MlHrNRcf7kKu1QBP0/MvM7HjOicnAXlVdhcwfxRiiWloJqmyH1mJYrAxk8q2v7voOYRf65M86c2hCMZaf+l1mdaCnHvSQuPJrGq5TrWBsJn4DBpLfNImSVtQjZziyRwkeectSeau9nWHFuAyMDfyA8YSKNkJlCdhKum/5++MX5dsHDhkDFx+YZOcP6YCazF6eGbkIjKts2fg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=dOGFoKZR5O0+cxCWK/CarbYBq6AaWdQ9r/3XQX4yQN8=; b=pACQ3i9jhvdtSFErG2xg7QNqW4SUlqzwKJbk+J27rg/FzBAjrd2liML2oeXf8lob2pHmuPrP+p1jncSf1dNqrzXRmgJK0BU28oc4vXP4vOVr3auwugF0O3nyIiE3yDQ5tw7WVFfOUhj7prnG7dFqw29T+ak2Dkc3e+jYHUMnshg= Received: from BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) by PH0PR10MB4789.namprd10.prod.outlook.com (2603:10b6:510:3c::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8114.26; Fri, 1 Nov 2024 11:11:46 +0000 Received: from BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9]) by BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9%6]) with mapi id 15.20.8114.020; Fri, 1 Nov 2024 11:11:45 +0000 Date: Fri, 1 Nov 2024 11:11:42 +0000 From: Lorenzo Stoakes To: Aleksandr Nogikh Cc: syzbot , akpm@linux-foundation.org, jannh@google.com, liam.howlett@oracle.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, Alan Stern , Dmitry Vyukov Subject: Re: [syzbot] [mm?] [input?] [usb?] INFO: rcu detected stall in brk (2) Message-ID: <2023ed50-9aa4-4bc9-8283-82a84c55bc36@lucifer.local> References: <6723b31e.050a0220.35b515.0165.GAE@google.com> <2928b6e8-3928-411d-82b8-6b17be266deb@lucifer.local> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-ClientProxiedBy: LO2P265CA0426.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a0::30) To BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB3366:EE_|PH0PR10MB4789:EE_ X-MS-Office365-Filtering-Correlation-Id: b5ba82d6-16e7-4e41-2f4a-08dcfa65f902 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?utf-8?B?MG1icDJqdm1aTWZ4d2xnSkRMZGh1YnVTRWVQYVZXTERHTkhXM0p2L01hL0hq?= =?utf-8?B?bWJyRWJBS2dQd1NsWExzU0s1cFdUWHZIQXBIajdUL20zWkIwdEZhQjJIb2Er?= =?utf-8?B?Zm9yTWV1NzY1aXk2MUd6TlhYZFdFWlAzekV4QUMzaytsY2FPN0lpMmhoQXdW?= =?utf-8?B?bDB2ZHoyT3ZiNzNGWmFKVzQ3bkVSWXZLNmZqdG94U1lrVi9yQ0wrSWNaZVpJ?= =?utf-8?B?OFRPRW5uMEFncWloRFduY0lXK0RqTHZjMjl2ajdMWHN3bFluUW9hMXg3b3dz?= =?utf-8?B?aDBXdnN0M01JVWNMZG01d05xY1NmRHRqMStoOWRGWE9Oc1QweW84S0lVaG5N?= =?utf-8?B?RktsZHlpLytSL085MTQraUpmbER6Q2JOMS8xSStnYVNGWmdjTHZ5T20vSkU4?= =?utf-8?B?ekdmanhId1I0MDNzczhBbys2K2orTHZGK2VuMTRQYlhhN082S2NSWThPWTJF?= =?utf-8?B?cFIzNmhaYVEyODdwRmMrVXh3djV4ZkkxeEwxRVVraVgwaW5Sall4aXVMdHhi?= =?utf-8?B?d2lROWUyVkhrY2pGbjAxS0dsT1ZaakN4KzlpbThpbWwzZ09CL243T203cGlo?= =?utf-8?B?Z2xaeXF1R1h5ZjlyTDRnMllCVlcxNFh1WG1jcGhZSkN1TDRWSXlWd0VhaThL?= =?utf-8?B?VnlqMXZ0bXJXZUVQSWRCQzM2bFVwREtaMGEvVDlkS3RTRWsxTzRGTVdTU1dz?= =?utf-8?B?aUpqK0JuWHd3Y1I3Umtlb1l0M0lTdXBwRXUxa0tMYVBUOUlOL0VvTzRnQXEw?= =?utf-8?B?M0haVXhqQmUrZVU5TW9VdXFTZExsdGZjc0xGZjh4cFpTVGQ0VVVhUm4wYWRY?= =?utf-8?B?MVFEZjRkQldWVDMzMVI3NGFHSnJkTTZyckJPcmQrWW1MMVNsM1RiWDNqTy9j?= =?utf-8?B?bnBiUi9wYjZMY0dnUTNMWlNiNUhVWDZzNDlRZG96WlhDQk03aVZUMW1EcVd4?= =?utf-8?B?VFJocjgxZTZDdWN5YWhMc1kyN0s0Qm85cys1TFFzcU5MWEMwRnJ6Q0VKRGwy?= =?utf-8?B?VGVSWE9sWmZtazVGQnF6bjN1NjdZaUFiYVhWeFdIekx5Z0RUdllKMFlPKzc2?= =?utf-8?B?dVJrbVBtYVYvNEpWcm1WYW9Cb3o3MFJmVk5QTTROR1ZXUG1WL2RRY29Ta0Z6?= =?utf-8?B?UDYvbE5qY3lCWEtBYlp1TTdkUlp0NFNDcGhESi92eVBmc0RGWXVVZzhzUE5C?= =?utf-8?B?WkExRkhtZ0MyMVNFblZuTi9xNktrVnBTSjRZSmp2R29qdzBKcnowRnZXajd4?= =?utf-8?B?MnlFMkJrMGo1Y3BsUHJxTjVXZmRQeTRCdUVycEZzcEkvbEdxZ2MvVW9LTGJu?= =?utf-8?B?STB5UG5xRElSNjQvSU1rTVJWdEd2VHpPbk53NW8vWE9EcCtqWWhSVmU4dGli?= =?utf-8?B?QU5uNXZjZVNxZXd2QmtXYVJBaUpGWUhXYWhrMUtCdjUweFZZWnh2S0hFQTBp?= =?utf-8?B?czVXY1dtdlM0dDIyTEtOU09hRWpuTHI3eEgrbzcxbXNsMXozZEJsVmJYTnpi?= =?utf-8?B?MVhpdUEzaE52bm4rZk0wNy9XSHZSejBwaGFsYUZGTEtXMmVFbytmdmdFVVhw?= =?utf-8?B?dmxjU0h3MmtNM2UwQ2RwMWdWaFhOdEVrSUNyVG9OM3ZXYzR5MWFKem5JWGdm?= =?utf-8?B?WU1PTmNMWEtBREk1UnZJUThBTEtRMFZCRnlsU0MwK0tyYWxiNlEySC94eEsw?= =?utf-8?B?TUVtbTlSVnY1VDd2dS9iNGxqMDBoQ3UvaUhSVDRLMld0ZG0xZnphSFFBPT0=?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB3366.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(7416014)(1800799024)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?cnZtNGNpblYrRVNzVjNJejZNdkJJb0hxWU9lOFZ3WFhPVDlyQkVMbEVnUGht?= =?utf-8?B?M2ZqQ25CTFJnbWpSOVgrcjRnWXlsQkJSN3luWXo5c0dhcDZIUDcwd3V4OUhD?= =?utf-8?B?OWk2cDNUclVQc0FSb1ZLRzI3Qnl6YTNTeEg1ZWVMQmlkdjlObWtSb3pjU2Fo?= =?utf-8?B?eFlPM3l6dXg0MVpDb2wwNTRlOGU5UXlpYksxNUo4OVdnWG00QW56dzV3SmlD?= =?utf-8?B?UHozZC9CalAwa2llNmJFOFpiSHc1cEVWc3RTMlR6dEY0cGd0MGtMb1BybUtu?= =?utf-8?B?NHh1azlDUDJSVnNta0pIb3pDY0d6a1BoRld0TXlqTC9UNjFKcDFqQmJIWGpn?= =?utf-8?B?ckFhSjBXYklaSmZERVprbXZWdFRLbUQvZlNoNXdHdlZvWTQzUGZZZ3IzT0FC?= =?utf-8?B?Z3U5Sk5YOXY0NVhROG16cFMrOXBBMnN6eGxOUVZwVGtGOGRlalcraFE1QWpZ?= =?utf-8?B?WHBTbURYVnZSOXBiU2RiUkdCRDBUS3BKei93QmdVei91UzRVZU5jYkNTYWpD?= =?utf-8?B?LzdSSFh3U2Nldlo2UUQ4ck5relU3dUM4TE4rR09iUXd2cUw4aGlHa1FoUjZm?= =?utf-8?B?QW8wUE95YnJoU3ZqZEcrdE41cy9kbTIxTWdxK2VRYStTN1VIcndXMFNTbVpn?= =?utf-8?B?UTZXSUVMaExNMjdhUHNKVVdxb28wYWF5cUtTYVY3U28wTTVKdUVVZHBYb1Zo?= =?utf-8?B?TUxnbE5iUER2UFhkbzBWa3BFdFBzd2I0Z2NFWTBpdkw3aGxJL1BxUE15d29u?= =?utf-8?B?SmVGaDc3MHZKeDBGMXJDSDNFNE9sRk1jTDR3Y3lqVlQ3cUVkMW1xbVlMSTB5?= =?utf-8?B?aFlkVDUwUTNNbjAxK29PREg0dDJSdExtcEZ3WEtmakZnWjNMamVqZjBwc1ZR?= =?utf-8?B?VkFOSWN5alZPcjVrRytkREg1WW8vSWRlMG04TDU3d2kxNlJMSTB6RFZxRWpG?= =?utf-8?B?cFNCTVRwSkc1R2FheVdPejRuUUc0Zy8zekt3Rjh4VnZsWnZEU2FyWEt5TTQ3?= =?utf-8?B?M0gvWlBvYjJ3bTVDcVA0amY2UFhQaW9aRXRaRC9zZm16dDF6bkROWm5IWHNJ?= =?utf-8?B?eGxxWnBSNm5ybU9Bcnc5eVVKTG1YV20yY2ticE1pWnRhd3ZQNjFVQTB6bnVO?= =?utf-8?B?YmNoNFF1YnY1eU1JelB0TmhBVVE4c2poZFZQRjJGeis0U1Yxdm9FVzJJNjhI?= =?utf-8?B?TWJWNXlCeGNmaENIQndkUlNoVzRxR1paUDRDK00wc3E0b2JXdGgvYnQrNEtD?= =?utf-8?B?WE01MmVhRDUreHhQdVVYOVNYOWlCOENLTTFnRU9IcUdsZVVQVVU0Zm5GSXBw?= =?utf-8?B?a1BrL1dTS2JYNDBaNUVObVJla0NtRGpBd2VvNHdVTmVCQXhCeFY4d00rL1Bq?= =?utf-8?B?YUVEK3pNUG1LYWkybEFpQVptMk1aYXNuelRqSlhTb1hOLzJNeGM3SHJGdGwx?= =?utf-8?B?SUVDd2lyOXVZTEk3V1ZZK3BWR0lVUTBPTmdJWkRKaC82bktSak1FZ0xHM2l5?= =?utf-8?B?TWJyN1dMZHJjL3FwaVVuZ3VIOHA3dG05c0o5MitqVDdXc1lGTFFlZ04zR2da?= =?utf-8?B?L2h1aVZ4RVlJeDU2QmJCdERwZGNBeUd0QU5FTXJPelpRT3V3c2Y1bGpXaEFp?= =?utf-8?B?NGRQVEtEeU9oQjEzRjNUc1crajB1ZDlSTmRsN3Q1eVppNG4xUnFyMU9Va094?= =?utf-8?B?UlpPUUlqSU02NUJzelB0YnlYOHNIV0RnUzRrWUVtTUxMcFhCQUpFTzRoNk9y?= =?utf-8?B?Rk1PRDV3RmxDSGtZaUUwMlUvdjdQd3dudDF1RWRpU2laQmtYK2swWlFxK0Jh?= =?utf-8?B?UW1KVFIyKysvdU13TTMreFJJL0xyb0NxMXcwL2dmb1NhUzhiV1JvRkt4WHdQ?= =?utf-8?B?S21hMzhyVDl3eEc1NzVoODU2QzJLTmJsYkszbXdYOEgxNUZkOXFrYXlUU0N6?= =?utf-8?B?NzZpMG9OMk9lQUkzSUNpTktOV0RqcDFXSVJXMU1ZaVRVcWZTT0FQOTZIVG4z?= =?utf-8?B?d09qUGJZOVloNXlGem9IVEh6OWF4WldTSlBtQmkyaEJaM2czS3Arc0JsWDd3?= =?utf-8?B?cy83U1EzZGt2ZUM1dm4yRklPakJJc2dOSTkyTlkxMHpVT01jYWFtT3V2TG9U?= =?utf-8?B?UlpRTjJVVG1Ra3hLU0tDS2Q2SW1EZlJPRENsZ1Y3RW0zZzF6bXhTM0VnbjVy?= =?utf-8?B?VlE9PQ==?= X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: b5ba82d6-16e7-4e41-2f4a-08dcfa65f902 X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB3366.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Nov 2024 11:11:45.8747 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: cmyoYObAvIT2viKC3uiVBsPcQbXXRXTQ+lGQhJ6+vlMpLf1WjK9nb84xvZe2D1Ke1sqZh5//+c4jV0e0iukvXC1UL1vU/X2d0zHOEzPmo0k= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR10MB4789 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-01_06,2024-10-31_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411010080 X-Proofpoint-GUID: K6-MeiFbVB0q1cZqAwYLCpyg6Y5pdiaT X-Proofpoint-ORIG-GUID: K6-MeiFbVB0q1cZqAwYLCpyg6Y5pdiaT X-Stat-Signature: umckrjj4cnsatqmx5m84mnnts6xc6mha X-Rspam-User: X-Rspamd-Queue-Id: B193F80026 X-Rspamd-Server: rspam02 X-HE-Tag: 1730459460-450421 X-HE-Meta: U2FsdGVkX19KzkeN4SAJ19nTRlynVkYfBSK+33GV0idyIli3hJo5Dfxd3usDQlZUMQmheVMzVTnbRRyaNoXFIdQFqnkPrl6zPckXyuUG2AyaJuDQxiI766GqrJhwQxLmlGzzow5BU7as+nZ3sjFbeXEPnYPpGyx+qoVpJhHFvnI2ROjQDKQNEOnxljKyhrAXAEH6HGUV8DGaDvZFilTN7UbeEU9mT5fbOFzbvWahtCBnryEe9a07zNR1Jt164hLpG8Rw1AmExH/EqUO65jF82P9PToIodczJky/6g7ipn84rGTbM6bT0tcZpmBxAbsv0DXdEox/xB6a5qUUVQy6k+blNYshqR+bh/8EPI44aap1naqgQ9HJ0bbFOCvNVfKZlvr4n7RJRWuTWP8h7gMQ0uz/x3HkgZpgpvyZBVxLkxedL30tuwh/TIECFfeQV5+aed6ELaSyoiFA2KSl8j2Eb+YFGvy4HNH0B8LAM7SKZkAMFV5IvmgetCqYF0nyUdiDxJ2f5OyIZnAcTw9GKMqd3d7IPycc4EjMvupsG4aguOyZjxV3TUb1yE7hUKouK7Ef1C3uFeTCNGTMZ0i+5KThYZHCjNfA2FQWFYAZurswB2Sx9q3tEivL/ZaauTHbEfqsF9eGmI3GuQplZKewlbvxINwRhJN1uIUwxp2DVT8/pF9XF5Z6cftWvIbfHtM0RCVjCq4S0AbQ57bGj+wz/OljY4sRk5fXDtfEzwxz0sViEePDLw1UzOT6eysDuk0yy6QRAKkvlT0ZghpjtGpUbrvWAU+iOHFKwNsyGZ/5/yCwCSxV+lZTZvexX3KwUkJn59tFfECf7BzRZtY52QypYRACbbMl0VI/ioJQeju31QErE3tVH0He4NOxuSEV8BMo50Fkh6oN39guc88QhwVAKUgZmsZOQXwI6Mmgsjii/958/mtbwbMBUGSIsI3JfqHvBVlaD+QhAVEayAtlsHiEk2gl weBsk+3O Nldy0WKf7RveZ8BOyd4HkonXJQeTCtSVKTrajJh2t+84rCDHSx+Bc1CL/4n7gRvWaVkE0Odho1EeWJsjVEpltYKGBAoFcjdCnKnEAvsJsckowcSXkTWqc4XAriIRfX8ZQ4o72hzW7fCoWP/impfRsJTfJQeR8l7LQehSSlXhH1W6Z3958hAHFnrYxf/KPaNTWXmfe96W+jScGNq+IZDvv0r3s5v7d+fjVX7DNI/wEacIGz6YqXe/YdubSFnaeqroQcF00QE/mqHtYafQO2LDGUaKu9VkeeTeoVxewxeq9g5Iy43+l55in93RTMHdShxxE5xkSyrvASOGrsI7FarAlICcTe9ycxAxRvF0i4k3qqrtbhIH2k6r7qLezkDMvomwy/IAjXZJhRAnQWbc9lP3dUGOvK1hZYJZIqe2XCAK21/nC90R8buY8bjKd2Yv2jzvjXmcMeTCQTo7CoEqn5sWruy83CJ3LvB9VcPVifwLf313jH0ejpNEoAx+RaIXkadmjp7Y42Ta3yXDbpCgUZInwmYMrgt2khIt+TuNhLGVeNNP+GAKdQheGzhMRnIfx4Aq/vryYumI4RmpnQotiTlwaN1fRZu/c0KidaXA0j7G2lbxlFIY5OzDA8fe1TqdxpbfHxJXdhM2DMPOlttjPDMXs0jS2GDAf1eJY7ogL5lxcJECVMMJIugNrYYh0muSP0UDertQqOJQw4O+XWvvw8i2inNU/HHoDwKJvFCpFWzfBnlDAx72euU4ew6LT2BOoISVngY/+J7psCz2b01ohOe/t0i3aWTciTyPW7l9pO3HdtWIwA5OnOOcY7f+qty5GSv/aaanvLQ6fr2hdF4qmBLbHaaNYdwCRYJMkROnULMJDRvRnF8O8BtOAUNOgsT9Cy1BucuEBghplER7okYNL2SRqWi/keGnqphbxPCepyAEFrPNp/yfsgR7r1P/mKC2lX+u1uQ3mAhvWFvUK+FlMAihCeqfaAkuz F1v97ooo 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: On Fri, Nov 01, 2024 at 12:02:25PM +0100, Aleksandr Nogikh wrote: > Hi Lorenzo, > > On Thu, Oct 31, 2024 at 5:59 PM 'Lorenzo Stoakes' via syzkaller-bugs > wrote: > > > > +Alan re: USB stalls > > > > On Thu, Oct 31, 2024 at 09:41:02AM -0700, syzbot wrote: > > > Hello, > > > > > > syzbot has tested the proposed patch and the reproducer did not trigger any issue: > > > > > > Reported-by: syzbot+7402e6c8042635c93ead@syzkaller.appspotmail.com > > > Tested-by: syzbot+7402e6c8042635c93ead@syzkaller.appspotmail.com > > > > > > Tested on: > > > > > > commit: cffcc47b mm/mlock: set the correct prev on failure > > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-hotfixes-unstable > > > console output: https://syzkaller.appspot.com/x/log.txt?x=1304a630580000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=6648774f7c39d413 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=7402e6c8042635c93ead > > > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > > > > > > Note: no patches were applied. > > > Note: testing is done by a robot and is best-effort only. > > > > OK this seems likely to be intermittant (and unrelated to what's in > > mm-unstable-fixes honestly) and does make me wonder if the fix referenced > > in [0] really has sorted things out? Or whether it has perhaps help > > mitigate the issue but not sufficiently in conjunction with debug things > > that slow things down. > > > > Because we keep getting these reports, that mysteriously don't occur if we > > re-run (or hit other code paths), they seem to hit somewhat arbitrary parts > > of mm, and because CONFIG_DEBUG_VM_MAPLE_TREE is set we spend a _long_ time > > in mm validating trees (this config option is REALLY REALLY heavy-handed). > > > > I note we also set CONFIG_KCOV and CONFIG_KCOV_INSTRUMENT_ALL which isn't > > going to make anything quicker if the USB gets laggy. > > These are necessary for coverage-guided fuzzing. Though when we find > and run reproducers, we don't actually set up /dev/kcov, so I guess > the impact of coverage callbacks here is not that significant here. > CONFIG_KASAN is likely slowing down things much more. > > > > > I'm not sure if there's a human who can help tweak the config for these > > hardware-centric tests at Google? At least tweaking the RCU stall time > > anyway? > > We currently set: > > CONFIG_RCU_CPU_STALL_TIMEOUT=100 > CONFIG_RCU_EXP_CPU_STALL_TIMEOUT=21000 > > The expedited RCU timeout was limited to 21 seconds up to some time > ago, but I guess now we can safely increase this number as well. I'll > send a PR with syzbot config updates. Ah thanks, just sent a reply immediately prior to receiving this :) Maybe worth setting CONFIG_RCU_EXP_CPU_STALL_TIMEOUT to 0 so it matches the CPU stall timeout? At least for builds that also set heavy debug options like CONFIG_DEBUG_VM_MAPLE_TREE? Cheers, Lorenzo > > -- > Aleksandr > > > > > In any case this continues not to look likely to be an actual mm issue as > > far as I can see. > > > > In [0] we were stalled in a validate call which would align with the idea > > that perhaps we were just dealing with a very very big tree and getting > > slow down that way. > > > > Cheers, Lorenzo > > > > [0]:https://lore.kernel.org/all/967f3aa0-447a-4121-b80b-299c926a33f5@rowland.harvard.edu/ > >