From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (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 9C07A17B425; Mon, 5 May 2025 15:05:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=192.198.163.16 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746457557; cv=fail; b=prehHEX9nRuh9lo/Dx0t9L8rPhruvxpioE4YAoOWJ8PBherVOtTXf9a3wcU1MWLtWGeZt5V5sTYw2Ff63BHF0A9/bxlpt8/g0x+3MEgPrmNf4OZ7xsTGK3Aj6lYbRSMvoYhtpCkzso3vbvpRDP7BdeBx7p1vOjMR4MB3VMMYE1c= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746457557; c=relaxed/simple; bh=cecpNvad3KhiZmGk3Wo+2X0Cl21ma+4Tguu84qjiIls=; h=Message-ID:Date:Subject:To:CC:References:From:In-Reply-To: Content-Type:MIME-Version; b=PR+VEgRENMB08VTtucpR+t6htdFLhteZcSVehL3n1ZkwsX/8fJtuwdQ55HdTtPZiuMzXCMKOiZGmIxUi+MDNH+u3Rx7YuMDuURVb0mA1rF95cFEM2bVKaDnYElvzB8xgTuvDtS1EY3runj3a4psRcRvsfGUwLt6TmkpdGHOpLPg= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=BfB67pwf; arc=fail smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="BfB67pwf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1746457556; x=1777993556; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=cecpNvad3KhiZmGk3Wo+2X0Cl21ma+4Tguu84qjiIls=; b=BfB67pwf8IbRKGpxyTLsODp1z/55VWl8W7at+v+LoGBVrxNYmbdlZn5S nvf0u/R7554GVWreeVz+3zlYtyF8l/YYGBb/2J7XOgVo8MkP/Cp+4KQ17 hdO3hle25IRlh1d/AkZGxkfoVw5H/DdjOtzFp+7Oi0yoBSm/ZTGWEAQAy i8MYJu94Vqx3ocS4iTbjpJtLRL6r/2AEF0vomT9aOFpjGs4vA7bD6d6kG Zks3ISg3Ba7rfCYWc5BdhS53sHcvwMLw7PrXqn2nU9V24mLM1SO/d0af4 hKAcy0Cx6PeEA4EddYM6s6YNkHR4C/zs9ruKQDApfz8WcdzSE2NAhBNlt Q==; X-CSE-ConnectionGUID: eRd6Hnn2RHKKcM3ONgq/Wg== X-CSE-MsgGUID: SWYr8zoURkqFK1m7MhzpTQ== X-IronPort-AV: E=McAfee;i="6700,10204,11424"; a="35691518" X-IronPort-AV: E=Sophos;i="6.15,262,1739865600"; d="scan'208";a="35691518" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2025 08:05:54 -0700 X-CSE-ConnectionGUID: mjtiSBvlSeCK5FFT8pXFvw== X-CSE-MsgGUID: Ug/dOuPLQtaorUG0AVpktQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,262,1739865600"; d="scan'208";a="135013778" Received: from orsmsx902.amr.corp.intel.com ([10.22.229.24]) by orviesa009.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 May 2025 08:05:53 -0700 Received: from ORSMSX901.amr.corp.intel.com (10.22.229.23) by ORSMSX902.amr.corp.intel.com (10.22.229.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14; Mon, 5 May 2025 08:05:49 -0700 Received: from orsedg603.ED.cps.intel.com (10.7.248.4) by ORSMSX901.amr.corp.intel.com (10.22.229.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14 via Frontend Transport; Mon, 5 May 2025 08:05:49 -0700 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (104.47.58.170) by edgegateway.intel.com (134.134.137.100) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.44; Mon, 5 May 2025 08:03:40 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=tJKejSp+eKWhA5kcLYlu+dGD+2J/sEHcp8Z1H7f1gZnG3aj40pttkHc+W2q2xssS2tco/9EKfwNc5fHQfvVvvXQJnBMp8XsetwaYA6Fs/K1SSRcXzJJ74RPB91Vh50k5ZXEqQeARvwYG/T1LsVG6e+ZzUxc+A3kDPSdoS8zD+t65U2k5JaHgjl9eNkEJNMldEloIshaXNM1gmkU/fojYc0apI9JWzNbJ7Njw/emFZMmxGhoSx3VdskdRrcGIvg/b2kIunQ5K2oVDlvdUShiYpOY4iOw7VULRaFRd1W9xT+5VI49GocRsJa+gqYGe3Y9G3TbZUm0oJJ8y55q7RmgQLQ== 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=VpZuVtCUwfIYC9QizyHsBpNfFO88BC944QeIfEWy6f4=; b=DqHm6+rxU1BUL8mn24l+Sek9UPx0e1376fWXYfqenRYHL4IBOZNskJlusd63iQkyiLDxccnjbAqlb6bOv6V+JsDWWoCFs8HDhZSxflF/scihgp9QupjsPrQzOGSkeGWnV4aQqLRza8dFlcplVviTBVyM48lL7shr3VYke/9YL1VIx07iwG5Q75KiiWzAtF7IGYT7m5aYikCHHh+y2llYnJRropwai1oyYAvWrrmbutlaBaZS5AKQh/Hz9jjibL9e9C2wPH6iaVbvS+3nWp+dVCC3y/PEamrY854S9jou6jRz4//zLRkYpHYy+eN8wFCjk71s6jJWndssUH1cjoDi2A== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) by PH8PR11MB6731.namprd11.prod.outlook.com (2603:10b6:510:1c7::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8699.21; Mon, 5 May 2025 15:03:24 +0000 Received: from DM4PR11MB6020.namprd11.prod.outlook.com ([fe80::4af6:d44e:b6b0:fdce]) by DM4PR11MB6020.namprd11.prod.outlook.com ([fe80::4af6:d44e:b6b0:fdce%5]) with mapi id 15.20.8699.022; Mon, 5 May 2025 15:03:24 +0000 Message-ID: Date: Mon, 5 May 2025 23:03:10 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] sched/numa: add statistics of numa balance task migration To: "Jain, Ayush" , Andrew Morton CC: Ingo Molnar , Tejun Heo , Johannes Weiner , Jonathan Corbet , Mel Gorman , Michal Hocko , Michal Koutny , Muchun Song , Roman Gushchin , Shakeel Butt , "Chen, Tim C" , Aubrey Li , Libo Chen , , , , , K Prateek Nayak , Madadi Vineeth Reddy , , Peter Zijlstra References: <20250430103623.3349842-1-yu.c.chen@intel.com> <8b248ff3-43ae-4e40-9fa4-ba4a04f3c18b@amd.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <8b248ff3-43ae-4e40-9fa4-ba4a04f3c18b@amd.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KU1PR03CA0033.apcprd03.prod.outlook.com (2603:1096:802:19::21) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) 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: DM4PR11MB6020:EE_|PH8PR11MB6731:EE_ X-MS-Office365-Filtering-Correlation-Id: 4d1ac87d-2e8d-40d7-bd18-08dd8be5fb5a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?MEVCa1lWYXkySzQweFRna016cjhRMVdFZllaZ3N5KzAzTlBBOXFtdE9Gc2J6?= =?utf-8?B?aWU5NytkaGpxWUVhVXVTaEVXUHl1V3JZZnkvZ1I5S2lkcm83NUMwZG4rcnhY?= =?utf-8?B?eUdPSzRNSWpQUlQ0dHBkeVk3WEVqVXA5ZWQwYnB6RHBOTm5aVG1vcmdUc21X?= =?utf-8?B?OGFYM2dEZnl1ZC9iMkZrSEkvdnhIUlFNWk40MEZTakJsaEM1RzA0QU9adVVP?= =?utf-8?B?bWE4TUdYNWoyVDlKTFZ4eFVqNURISkhBbDh6Z042MFMya2xpY3lJQnZnbFlW?= =?utf-8?B?aGdRZzQvUHFCMFZmd3JDM2Y0WDBqaENlWkdjYStKU2c2Z1V3MTQ1TFhWZEpF?= =?utf-8?B?WCs2MXVTdUp3MHAxZ09wREdlZXlWNFVYRTlia0dLOFRNUHBEY2ZqMTFkMW1S?= =?utf-8?B?SEtSWmNUZ3dQY3A3S2h1U3RYTlBabmErZXRmdUtrSmVWelFLOENmVDM2dlVr?= =?utf-8?B?aitaakV6bTBRUmdXZDJvd1ZDdUJWemxvdzBLeVIyYzlscUU2bjFPK0lCL09G?= =?utf-8?B?YVNBaFhpcnZId01lNmNoa0w1Y20xdHNVeWNmZml3UkZ6ajJwZHNzbG53U2lL?= =?utf-8?B?SkJKY0J0bFd0VVo2YStqSm9QajVKeVRoVFRINzRYdGRDdGFBV2dHMklsMDkx?= =?utf-8?B?SWsyNEc0V2dtLzhpSVRVMUxCOVl5dzV2UnN5cGxrMlhpbEZ4cE1VTzBBRG1y?= =?utf-8?B?c3B2aWZiK3BqM3RrU0Flb0JDanZjY2pkVjJDb2tjT2cyaFRXS2Vlc0FINEVG?= =?utf-8?B?cDFaNEc2MWZ0QlB2VGljUmlIQXJKbXdYaWNwZHZ5VDVJWFpqcndrTnc3d2dz?= =?utf-8?B?VE1CRWdvT0hmcXRHY0I3L0FEM0hwSUdLUXVORU9icnNuRjg1UjhMcU9kMFJL?= =?utf-8?B?MjVSWm5DMkV6elZNSmFyS1NKeXBmSWJMdjVyZDB4cGZySFAvN2FqVktqWU9L?= =?utf-8?B?bUY1b3kraUt5LysxaHhkQVM2Y0xodUcvSTMvQVhiZzhWaWc3VGFzVjh6b2Mz?= =?utf-8?B?Rk84aUJpeVd0RUw1WXVBMmNwRjhLQ0NPOUdmQnNzeUlhQ0M2SGd5bC9HMkdq?= =?utf-8?B?V3lOZ2lteUdFdjVVSXE3bWtPVlVXQVI0UmZ0NWNLMkNRRXQvWGdyb3ZRK0NR?= =?utf-8?B?dTBTOXNNai9VRUFnaXlxODV2ZmIwUGRuMVFHV1RYcCt3ZjY1SlVkdDN1bGZw?= =?utf-8?B?QnNXbmJqZGdndFlrY2EweG5XMy8vS1J2b04zSkFKR2pXdTdxZkRVZHNCVm5o?= =?utf-8?B?bXFGdEE1RUdXSkhDM20rQUtiNmg1QlVwdFBnS3FHdC84bkJGazY1NHM0Z0Er?= =?utf-8?B?bDJZUkwvSVlVUGo0VmlsZGJqcnhDNmlNb0kxSHlVL2t0dnVQRGZYaXRnTGRp?= =?utf-8?B?MzBqZFJmY2NYZUN2c3dzZ2pFcytOQWVZMWErTm9WQ0twY0dVWlZSSmpCU2VN?= =?utf-8?B?a1d0NkV4eEdqK2IyK3lmN0VvL292dFhuS3VDYytiZzR0Q1UvYytpU1U4ZFFW?= =?utf-8?B?cmFPaHhwTmdjUUJmdEprTWVPb0llU2tpZEVnVGtxVXhVSUdtek9relA5NktD?= =?utf-8?B?Tlh5eTA3dkhLV0ZnYjBZNElIVmtoYnNVc0RjcXNKbjREc0FjdUlkMHpNUENU?= =?utf-8?B?M1plQytxek94WXhrRUcvTVlBTnV2WE1VNkZ1Sk1ibURCM2ZMcWZMdVFsYkJ1?= =?utf-8?B?UGpxakI2dG1La3pIM1FMaXVqa0VjZVlQaE82SEtkUjFmYWdWQi96VWtlNGpO?= =?utf-8?B?cC92eXBKcDZKOWNSRVRhQWp4SFVTWmZoL3l5R0dIWFhTck1URncxZklEK0dz?= =?utf-8?B?SmVIU0oyQ1g0R3lZQTVxVmRaK2dMaEgvQXFKSXpOMG9pcy9nVW8rd1g2U1V2?= =?utf-8?B?UEVvUWFBaFlQVlYvY3ZScmp6bWZtVWhiZ3RGaW5rbnRhcHFnVlNsR0xwSFpH?= =?utf-8?Q?nomaNlDs8bg=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM4PR11MB6020.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014)(7416014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?QWpmQnY0VlBickEvTnRucjFRcmNBcTlLdHY2TmJCdkllS0l3cDdTOFNQNDhz?= =?utf-8?B?dm9NQlZwdVE5WG1aZmFoWVV5T1IyTHRUQzNRTXkvSGc3aTlGSElKQkxxZnhh?= =?utf-8?B?UDBvbmlZQmJzYmdpK2VxNmtzZmF4a1pGVjY0QmdlalNCb2dBRGc0eUdWWTFx?= =?utf-8?B?TG9UOThDY1I1NXdQWmVka3puSGxrNUF0TFVSL20wZS9ORWNZaVZMMjZ0YlFm?= =?utf-8?B?c2xjQ3poK1hGakxmemJ2RitMTDZ3Yk5RUHBoWjFGT0s1WTdrNHozVGpJbFlN?= =?utf-8?B?VGRhdDd2dmNuRXhvbmZOQkNBWmF6T2F0Vi92azR0YkFOUUhZQmRpbXF0ZTNY?= =?utf-8?B?WW5BMFRPam1qSXFDaGpJenhkSktZdEdRdUljb0pncURaa3ZkL3ZBb3p0UkpG?= =?utf-8?B?alJVR3JwZmNjTFZjaFgweEhZZ3h1WDIyYmpyN0YvUFVRN3JvWHlTcHJpNEtE?= =?utf-8?B?VjVCaW5hdDRtbmJEVkNZbUNPTWJya2tOVFRrcVAzbEh2dzRENEtEekF2NHNm?= =?utf-8?B?b1BiRlA0SmFEY2o0MzVvTU9ReE5ucjNtR0F4V0g4NWJIZ24xQzlkTnZTL3ZB?= =?utf-8?B?M0dNZkRtY1k1c0ZhRVBqQ3VFV3E4WEkvS2VDOGxXb0x4dmQxVTB5WjJRck1G?= =?utf-8?B?SDNzOEZzUkYxZEg5QzJoR2tFSnpaSk1YUjNCTlVLREE5M1Z5azZiODZyVkRu?= =?utf-8?B?UTFEYklRaUVvRkpmeVdibEFxOVdGZHd3WEY4b3lzblJTMFhPU3VSdWRxejMv?= =?utf-8?B?YVpqT2ttZStiQ2VVQ2VLRjQvTXhpY2w1ckdXcEJkQi95dmNuc1hEQzhoNGt2?= =?utf-8?B?TVFuS05VeG03RjBscHpIbWoranVubXRJckE2aERheDJaZU0ydDladGRscXl3?= =?utf-8?B?eGNNSys3L29nMEJFMDlFb3RsN2UyS2dLTy9YTGpjcUJRSUpRUnpYdWY2UlY5?= =?utf-8?B?NUoxMjNmeHkvakdiZ3dEaUV3ckR5MUpOeU00VVdNWmRFc2VaUUYzTjNQNmZL?= =?utf-8?B?ZU02TmcyckRiTXdZem1WLzBlaG16Mm1NMTVHSUNMdTBMWHFRMTU0eVZoOFVM?= =?utf-8?B?dTlrVEFMK3drejV5SXRKMHVpbHk1ckc3YlZObG5KdWhDVE9lL0oxOFJEcTli?= =?utf-8?B?ZTVrTWFRVVhVSFQvRnhEOEduYU8vT0lkNGl2V2h2cnNzUHF0REhPT1JIcE1Q?= =?utf-8?B?U3o2SUwydDltRjJTOUhUWlZQL1JmT2VwTFJmcjZ6ZGd5ZHZuTmZyUHZRMlNv?= =?utf-8?B?NUV1VFMwV3NuSm9BTUE4UVhsRmJCblhiWkpzL0MyOERuelVLeTd2UWFTL05k?= =?utf-8?B?MDR6MlhBT3ZpbkFBYWlVZnRzVkVzUHBsNVBGYVZXU3BDUXZSanRvcWNIVnRN?= =?utf-8?B?Nll4TTBRRjVEdDBGZ3Z1blpzUGNqUWlXYWk4Uk5wL2Jwb2hNQ1hrTCtuVE9R?= =?utf-8?B?V0VpTWg1YmpCM012TjlKNW1KS0g5dWZUam5xUXpsNEhWWXVvZFNTT3d1eEhT?= =?utf-8?B?WFVLRU92Ti9RTnBmdnIxeE0wSFRqMG5xOURwOEYxTWNLWGJjeHVmSitlcHRa?= =?utf-8?B?N1RSL21hbStOUy8rQjVHMGE0aHN3b0JFdjhFS1d0Tjh2MUJ5aGprcHhMZGFR?= =?utf-8?B?WUNYdGN4YW1idFQwUTYrNnZCYitoajBUNTAyNUdlRTllQkJqemxUUG9nZ2Qy?= =?utf-8?B?SGEwdkFUZm9NNlQxcTcwcE9KMUJNUGR3WlNkaGFwUEk1TU9PQVRyVm9oRDhF?= =?utf-8?B?czVyNHk3VjZzNVVhdFBqU2pQQ3BiN003T2s4Qzk4RWxnUlpHUldWWmp6U0tk?= =?utf-8?B?OVpiVUpNVGxmak5Ma3dkdEdzK1kwUDA1cGhYTDh0Nyt3R2p0dkhYM0U4MW1s?= =?utf-8?B?VGtsTVppbDRxb2grZ1hpaXA3Qm5PR3RJRE5IcnhqUDJsemFwTmRJbWZYSVps?= =?utf-8?B?aGpqUlR5ODQyNzJYRUwzcSt5OGZJek93a2cwTFdHYVV5eVM2czRkNmx2ZGsx?= =?utf-8?B?OWxJNHVXMytKb0dQZnhialZQNm9OeEpZWjNzdzc5NUpJVW5CSjQ5UkJ6cDYv?= =?utf-8?B?RUNLTHV4Vk4yWk5wY3dxKzMzTUlYUjgxd3hwczRvYW1PdHR1ZDJNRzQ0RlVR?= =?utf-8?Q?7tSFkLDvq8WSvXXCGXKGpC2Yh?= X-MS-Exchange-CrossTenant-Network-Message-Id: 4d1ac87d-2e8d-40d7-bd18-08dd8be5fb5a X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6020.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2025 15:03:24.5547 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0+rZoOiRdTcHqOdDKG8bGNjpavV7vGLVOe59HiYe5q625QCfnbKe5Jg90fBO6uI27clE9rEvgeo+70stOI9rQQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR11MB6731 X-OriginatorOrg: intel.com On 5/5/2025 2:43 PM, Jain, Ayush wrote: > > Hello, > > Hitting Kernel Panic on latest-next while running rcutorture tests > > 37ff6e9a2ce3 ("Add linux-next specific files for 20250502") > > reverting this patch fixes it > 3b2339eeb032 ("sched-numa-add-statistics-of-numa-balance-task-migration-v3") > https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/kernel/sched/core.c?id=3b2339eeb032627e9329daf70a4ba8cd62c9cc8d > > by looking at RIP pointer > > $ ./scripts/faddr2line vmlinux __migrate_swap_task+0x2e/0x180 > __migrate_swap_task+0x2e/0x180: > count_memcg_events_mm at include/linux/memcontrol.h:987 > (inlined by) count_memcg_events_mm at include/linux/memcontrol.h:978 > (inlined by) __migrate_swap_task at kernel/sched/core.c:3356 > > memcg = mem_cgroup_from_task(rcu_dereference(mm->owner)); > mm->owner -> NULL > > Attaching kernel logs below: > > [ 1070.635450] rcu-torture: rcu_torture_read_exit: End of episode > [ 1074.047617] BUG: kernel NULL pointer dereference, address: > 0000000000000498 Thanks Ayush, According to this address, 4c 8b af 50 09 00 00 mov 0x950(%rdi),%r13 <--- r13 = p->mm; 49 8b bd 98 04 00 00 mov 0x498(%r13),%rdi <--- p->mm->owner It seems that this task to be swapped has NULL mm_struct. Does the following help? diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 96db6947bc92..0cb8cc4d551d 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3353,7 +3353,8 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) static void __migrate_swap_task(struct task_struct *p, int cpu) { __schedstat_inc(p->stats.numa_task_swapped); - count_memcg_event_mm(p->mm, NUMA_TASK_SWAP); + if (p->mm) + count_memcg_event_mm(p->mm, NUMA_TASK_SWAP); if (task_on_rq_queued(p)) { struct rq *src_rq, *dst_rq; Hi Andrew, May I know if we can hold this patch and not merge it for now, besides this regression, Libo has another comment related to this patch and I'll address it in next version. Sorry for inconvenience. thanks, Chenyu