From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B96DD19993B for ; Mon, 23 Sep 2024 13:59:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.177.32 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727099960; cv=fail; b=cs8013hCrMnTMeUHCtSyxqetGISucbUddgfut241NK5z82t6nhx7azJVYwfJhQxrOVIiWhkqQttbUnR7mE+UlTXc02gdVFF0SQIeU8XOVecQ/641dhpuEkWEXLwGHfWI7ZgHUHJa0Ew5Q0vEGh4dH8EkuwYZ93AVGeoyFYT/vLM= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727099960; c=relaxed/simple; bh=if6Dkltm3By2AblncupeOI3dGFrIsG9iIxvm3Q9lBMk=; h=Date:From:To:Cc:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:MIME-Version; b=mXARKNalI+6mLmO+nPYC7qHOwd8X4yfrnFRZx2M2T2bMA8NYjGcWAPqZATQO0K3/0Sdz0Lp+pPK8U/zwIIozpX6USQmNG76IhZWhZ0MQalJMMfGHycYx7WPWDXdTkUzqY1JQbjWGUFL3cNUlm3Iyms+JLmU2SsO3J8pgsex5rH8= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=jpbW6IgM; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=V/1LcLN3; arc=fail smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="jpbW6IgM"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="V/1LcLN3" Received: from pps.filterd (m0246632.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 48NDsU9e000403; Mon, 23 Sep 2024 13:59:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h= date:from:to:cc:subject:message-id:references:content-type :in-reply-to:mime-version; s=corp-2023-11-20; bh=DKXPENcodCFBXEp sXaCm0oKTh+n3x5dkqF0D2GY92dc=; b=jpbW6IgMFqp2yqKUq1c5DlyuvzYgcbW aL9Wos13Cdc5bEw6JuK/0xwuxXh6Cgj7vx+f4QUfBF9U/cXXvNhevJ3BmmGzC5VH MiUevd2usOYHEKGNpSFNQqmn9sIV7XmYDU+cGjQo6Aevk+kF+9LDENExK1vixNuV 6OzQTVVwwF7CnJtu7WVLyOMfeRFt3OCQU2NLHaApB53PhvAvPvNVS8zO8JDMOG2t hMx5SJVAjkB4w9G2K3Fv+4IRde4Sop4l//7QsmvboszbPQWj+7+9QFfMEFOP2pVb 4b3DsoMYMlMD/ZV9IEhMYyiXbpvBFm7s++tkViay7TzzIYDjaQJuh7w== Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.appoci.oracle.com [138.1.37.129]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 41snrt28s4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 23 Sep 2024 13:59:06 +0000 (GMT) Received: from pps.filterd (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 48NDj7og038771; Mon, 23 Sep 2024 13:59:06 GMT Received: from nam12-mw2-obe.outbound.protection.outlook.com (mail-mw2nam12lp2041.outbound.protection.outlook.com [104.47.66.41]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 41tkc4dr9q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 23 Sep 2024 13:59:05 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=QEpcUfnOURbPi/e/BFhMnGvEnEKl4A68oQZVV/Ucnm7Cs7xwnLDqXmX+YuFHwNpw8YoU+zu1mJjZq1ZCokGa1mX3BWBO4ItJWNq18bURuzLFK1bIUUuSWajb60ZuSUX0u3RQQfDGHnzrTKx1UcCUC6hBOLBiSP4X+s3QoZ7LKj2yZm3mRzk2K6lwg482tD6RnTgF+L6eS+hk+0NQf1ERwG64Yj8WWMxtjapBJwUVqDPSZdsPIXmU/kVbUvT4l+aajLV9T9UnOTu4O/FZkFkLQo4PQTkoaOvLn+KOqvAyDiJ78PsXQOrWnj8BNVSFMITrdYKIX65rS8lk8ugPsWHvng== 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=DKXPENcodCFBXEpsXaCm0oKTh+n3x5dkqF0D2GY92dc=; b=xNCA4GV9Gkoa5NFCep1dys3UvROz/Cg2k6rbw8m+aCh0yX8mU7mIXIGLzO7ZmPNKlloCWwjJ2CJAUeFQ+ieFqmG2eFGTDALgdrqOWcpyjKti+PymO1jNjKWzbuRMrpoxUkOxq0c/4uigdBRvpVjvTgDukz8SXEQjjB92apwtQwC5/nfAvklZYVSxnq96T84tl0plicKDk9oem5g4ybcLFfdKNbSgk40Y3m4FcvlwXFaSh2WyFAvytl/w6TuT1P6334ODzKq9EB4AEhSfBwAdYXxjK3jHOYTJpDuEFKPFo1+2rlDwvkIJG/tTv9Cq2kDlvp6WxI53iXzBEtHkbIxcRA== 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=DKXPENcodCFBXEpsXaCm0oKTh+n3x5dkqF0D2GY92dc=; b=V/1LcLN3VR6HccvewHWBpYbeKyFLlWwiRKG2Qubuczqp1RLL4Y4LhZ4wZ0Af4BA33AiwzYKNUDwYdsj7swa+Q+0QCmQZBTYuRL00OzzlObZPjH6avZlszVo+dIBmrzLOD7Cpr/lgIt7763cdCGkdPC1fkrOaKV/uBLvdkhLkLEo= Received: from SJ0PR10MB5613.namprd10.prod.outlook.com (2603:10b6:a03:3d0::5) by LV3PR10MB8058.namprd10.prod.outlook.com (2603:10b6:408:286::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8005.13; Mon, 23 Sep 2024 13:59:03 +0000 Received: from SJ0PR10MB5613.namprd10.prod.outlook.com ([fe80::4239:cf6f:9caa:940e]) by SJ0PR10MB5613.namprd10.prod.outlook.com ([fe80::4239:cf6f:9caa:940e%5]) with mapi id 15.20.8005.010; Mon, 23 Sep 2024 13:59:03 +0000 Date: Mon, 23 Sep 2024 14:59:00 +0100 From: Lorenzo Stoakes To: Marco Elver Cc: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Subject: Re: [syzbot] [mm?] KCSAN: data-race in mas_wr_store_entry / mtree_range_walk Message-ID: <6f327776-e22b-410e-a2ed-1b90c7ec76e5@lucifer.local> References: <66f12f17.050a0220.3eed3.000b.GAE@google.com> <53e80bb1-9d26-4885-81fd-6fe816b4980b@lucifer.local> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO4P123CA0506.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:272::19) To SJ0PR10MB5613.namprd10.prod.outlook.com (2603:10b6:a03:3d0::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ0PR10MB5613:EE_|LV3PR10MB8058:EE_ X-MS-Office365-Filtering-Correlation-Id: f8225f80-1029-4b49-89e8-08dcdbd7e1db X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|10070799003|366016|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?D6xhXl8MqOj8DiA71W7JGkjEngihXQCdBjr/wIAESfMnRHvj30mVbvP5mfSp?= =?us-ascii?Q?1nSfvOZDGqjYiXKi5VUx5Ta02Mz4mqnkd71ky0Pio/nD/tY5R4KCssFPyyw+?= =?us-ascii?Q?kKfG5/dSV7XwBkVA/tFIxBJCDEjvB6QyYU3CNkMpWNrdiERTmoIypZpEp1sW?= =?us-ascii?Q?x7d7ESih6l4rq860uSO8bGtE4YyxmecmoAOIxGVY2q4Prhs1P7TMII+TbLOg?= =?us-ascii?Q?D6eGJgg6Rd/zZAxBgE+yb9B1Uju+4orQ0huQeleHVKEEphCweLTC5XOxzNQV?= =?us-ascii?Q?J21mpu6eGqxv6+i3r9Ass+RFWkXYlUuG+0DNl2FjrEkskcD/Upk/eSF5AeRL?= =?us-ascii?Q?/6KKm+DX2wxNWJEce52Yw3sQwJHtZlZ+7vgY71gv3pLxr66lfRShonrrquro?= =?us-ascii?Q?4Y8etftPdK2RNXT+/67vtX+werH5D0sRQbB7uApJsesYr6oBHtt0tvoxMAj5?= =?us-ascii?Q?UWu13pn6HOyFCOAacytq2fzhWB1R8J/MnfQJfcWJ+HvJgZfjd9nY5EYy1MxH?= =?us-ascii?Q?BRLelb7nyNGK3/elxSr+qjVRN/9vpJvsn1xN9lrPsJ0Lje0XX0IHJNZzeDxv?= =?us-ascii?Q?+uQmacfzXhq+aRuZBz9H8L4v5MPeRGFnY695LIDKVgg08ds2zDi5/b7KGvwL?= =?us-ascii?Q?tG8Zyl/LKlZcUqjIPA/VEjWJhu3IzKuwTS0wyEI6bgKsXHwFM/w9OkPfRF1d?= =?us-ascii?Q?8521wwhOayxy7DYtI3vZpTRbwZcKUJotMrgWnic3jxQ1zStIiniEIZjCVhR6?= =?us-ascii?Q?P9aas6YUktIfqpSvdde15FKEPl+wRlNx9wTPiVlEmgoEqqwhPPk7hLOtD4Gv?= =?us-ascii?Q?umY9eMUf4DLjI0jIr8KkU3pPxeSeBvjLhaWpbSmc0w8CEYkfsIfWczAsAc+1?= =?us-ascii?Q?fkfblbCL6A9kEkgz8fzzMaxBMYkcq0q3IpPMPEK87e+jQ4hTkyZv+bAZuqDG?= =?us-ascii?Q?HOe5YtliqSm9Yofj4fo3sXLjnXAy3h4m/2IR8kvGIiexu38HHA6NokOnYCrj?= =?us-ascii?Q?ZUeHARp7iEQS3TwKVJhKfhXaKdRlrLL99PmM441u0CWZVLullZlma7VcSY2i?= =?us-ascii?Q?rR1kQpoqFsl5+Sz+hY0ZzVcg/TTtwEBXDjSomsPwfhdoOcZjLBJjCgsKFyE0?= =?us-ascii?Q?LGRiCusS356gL8pAB50lvoKowWYIXsbSyGnYPaoQBDSxLEl3KKY4+yoDzsSe?= =?us-ascii?Q?jMOxP5IrprYMvXBx7zY5pGAlVnWRAIUaIcRC+zSc9USFl502NUriIOuhvL6S?= =?us-ascii?Q?1FyiHbH8iyFw1Wcjkq34q6w7UGa3SCIeSsmvzZBdQNF1jnKp4LkBB2T2FBaU?= =?us-ascii?Q?7oo=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ0PR10MB5613.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(10070799003)(366016)(376014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?99zp4U6z7waxr+MdBUzSAuRRWgmHm1mxF5TESOEx9lUFCJTbvfPnoXecBaUI?= =?us-ascii?Q?67QkjsIHcUIl7CUCfk1vtc9qX8v2IJrxkGY0FVJHwC2E1PRHunizQUr/cxYA?= =?us-ascii?Q?2h7Oidd14HybadUWiGdDjHIuWx0RApw6EI4PCRnE7JoVnWv2BsDP+xwzPXHd?= =?us-ascii?Q?SoxgnV38ee4MWHBY8nq7oaLR50Hup+Fe87wyKR4AqWh5d//FBDB+fktCzKp1?= =?us-ascii?Q?imuhQHz2gEVLc0kaZmqF7nbAckU6Ly/eKDSaRH0H+h4VYp70dqwjSjNpZqAL?= =?us-ascii?Q?VfUnn8uo830DqVZc+hQrHa2wUeGwJVF/znqksKUdHrA8G8WF349KfR43hvb1?= =?us-ascii?Q?7XA/cNQhONJe1w/amKmG0hTQv2dqEY92uwKDEWO4GUk1SaivPfpFKEH1CxrR?= =?us-ascii?Q?LEf2slKKNlOynILpO8cy+tPJk7EwZXVKQ8S+m088EVW29ip9Y+T3DTQeyv35?= =?us-ascii?Q?CdQg2EWQXvYXcjJAJUd2UhkILVBCPX4OMkBDqmRRH2CN4Bwtwr/h+SS6+VPH?= =?us-ascii?Q?oSqm8yTO6xpDV0HonzCEJLWzV1WRVFBGQ8p2NWcC3PXZ9rmezbB+EoXjxt5T?= =?us-ascii?Q?3GCaybUfphXre8brWmSiEcH8Cz7m4CrDr5Tt68vcdYf3gAaZO2RCHLik6iC0?= =?us-ascii?Q?xJPARuX05529j8Zu+e4VYrCBf6PtmeXFN193Lx0Sx0yQDAlLiQ6un2HT3XJU?= =?us-ascii?Q?4VT7S5fO9IrjEmD2XxTbMFu2EvZphaxrowtp5GhlPArQipAR1jTXavKVOn8R?= =?us-ascii?Q?Uq3lLxHPnutHz7tiijaYs/xGRsyRSJPQZb25kj3AWwp7RJ8Sukchb4lQpvI7?= =?us-ascii?Q?OQr8loQXPjH4nGBk69XQfaHueiQ3Kk+jyyERjJ501sO0QXUjzFrgdF0PJ2uq?= =?us-ascii?Q?OI6FvuyvImaBoQfcwNauM0yflKkzt1OOS/Km1jCubt/fSoQj68mTpM9Vf5Aw?= =?us-ascii?Q?RrvpY9tFsYfCeiGlsjAcFuX9CRFLDLxuUPAlrgp50pSF/U6xMs49Y10acwZn?= =?us-ascii?Q?QOf2KlHcTGK0fZHFcPQbENayawWbpi0paFpezvPLTkHq4Fu81FY57L3QulmR?= =?us-ascii?Q?fkhL7BhScM10T9qXd45VjlFlZrT6O/eOx3m+VuMRAlUBnC8BkByFBHeyvW/v?= =?us-ascii?Q?Ld+cz4yv7WMo/R6YNnCirS948IIdNkgUA6K4iump5Zsqg8DQH1VxzRS669gV?= =?us-ascii?Q?UWOL+HXVu9VCG4Zeh7aJZliGUff/VmvRhtj+4h77SN0oCOTIhPtkBfjh6GSs?= =?us-ascii?Q?izsn8bRgDVThE6sH1WeYanTIUz/cofD5BAPe2pRtFxXcfpC4VR5QTLoxuAfP?= =?us-ascii?Q?4sAb4Wek5BNCKyrEQpYc3wgOouj6LIAi8mhiH3RYDzOPFdCgLEACsaZ2Ag0t?= =?us-ascii?Q?hG9QygwE5TreIvwczFiTYMrjdRDMjhs7nNj6Gl1BaeNjkvvDgOjrBFPVN7vY?= =?us-ascii?Q?FlhJQTv+ZsrchdFRlZbyRtmrR3AijGjQsuI2zPniQeJo8obKzzgFpGCQ2Svr?= =?us-ascii?Q?341g6eNFMB3GNeSG1fAbzlRjdS+QI4slMyhnKG/shQ3SaYMMFuyjUFxOY3TN?= =?us-ascii?Q?I6FiJe7fWQtCgWg3bFjKJ6vcq9qN+qf49YnzSoxRmAWijEttsQyAA9Z7liYu?= =?us-ascii?Q?XpzJpTk9+Smjyo29fMduARDgT2AjQcSIjTfh+X++a7SZdhkxxmyiJWp3m5Ih?= =?us-ascii?Q?MlbErw=3D=3D?= 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: f8225f80-1029-4b49-89e8-08dcdbd7e1db X-MS-Exchange-CrossTenant-AuthSource: SJ0PR10MB5613.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2024 13:59:03.4402 (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: Ud5O6qqXgzIQF04Abq7Q4BDVIRbJZH2mNNG6Y+SYoEFH5X+MCWOW4W43inz99ybzDH2q0MDXIcW0BmwWtpCD6hk5Ce8FlOcnC6x/adUMG5g= X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR10MB8058 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-23_10,2024-09-23_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 adultscore=0 mlxscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2408220000 definitions=main-2409230103 X-Proofpoint-GUID: 9JQel4qfBNax6DSLZGVpxQOUmO09zClB X-Proofpoint-ORIG-GUID: 9JQel4qfBNax6DSLZGVpxQOUmO09zClB On Mon, Sep 23, 2024 at 01:57:55PM GMT, Marco Elver wrote: > On Mon, 23 Sept 2024 at 11:44, 'Lorenzo Stoakes' via syzkaller-bugs > wrote: > > > > On Mon, Sep 23, 2024 at 02:04:23AM GMT, syzbot wrote: > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: 88264981f208 Merge tag 'sched_ext-for-6.12' of git://git.k.. > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=1237ec27980000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=e6702f5f2b8ed242 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=e01fa33e67abb0b3b3bb > > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > > > > > > Thanks for the report, investigating. > > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > I suspect given this is so timing-specific, a reproducer might be difficult. > > FWIW, syzbot currently does not try to find reproducers for KCSAN, > because it's too non-deterministic. Thanks, yes makes sense. > > The best strategy would be for a developer who has an intuition for > what might be going on to create a stress-test to reproduce. As per analysis in thread, I don't think this is really an issue, as one of the racing threads is code explicitly designed to accept and deal with races. We do obviously probably need an annotation, but unless it becomes urgent, will defer this until Liam's return to check and assess. Obviously if we see more reports I can dive back in! > > > This suggests we are failing to acquire an RCU lock on mmap() (though we > > have the write mmap lock). > > > > Maybe we missed an RCU lock at some point, but I'm a little baffled as to > > what could have changed in recent series to adjust this. > > > > I will dig into this and see what's going on. > > Thanks!