From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM02-DM3-obe.outbound.protection.outlook.com (mail-dm3nam02on2056.outbound.protection.outlook.com [40.107.95.56]) (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 8EFF91D89E3 for ; Tue, 10 Jun 2025 11:33:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.95.56 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749555208; cv=fail; b=uTmVFzGpqZKQYHPIbgqZHnV8qiKPX/VRIuBPkCFOf9/FycxGWxEc+y5PYVxYSrUTpxu2sPGf9Nnr6VA1jyjUYwIArNHQlCx9C7/4AhmD8ZQl37Lj7Fdt1EUhRRBFipfg35TaMsFyraxl9kUlATqGo5nKwy41bZbLZVawrzGDgeA= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749555208; c=relaxed/simple; bh=9maQiiaJmLyyo5hoJeWAnEl/sIGzTcH/7Uw3fkG58/I=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=g6rXnv77JeVpDnChR1ITYTchlbAea0mMVMnYWlkycnZ13tsMRxwTlMhai2fM0GMJx9EkshGe7uIoGne0U9bXcRzQVkpX36SeBRifa+udIbps2oovCSSEUfCgKqckfhso7DS87SVEUH6m0AeTj/Uoav3qL3W1dCIo0feoldgUYwM= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=zqT45sOf; arc=fail smtp.client-ip=40.107.95.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="zqT45sOf" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=D/eCSmL9yXMt/DG+syokc+e7jwkrkaYhWOS5MxGgSKG8jrHCnVPlDDqBmNbqHO5yRSVblhN+VuOFauRuOi30k34umDIDuwkiiF+L3DBsYnRQMzD2+mgXi1lfoNuFNe1WWIvqPMSJOpdhx8OrMyi8XAX8hi40XFOMcWuKM4NoWEXbnTY477uQZFRLhBcIcl3BmXYXtHJZb1SMyWS6hqHyGbjLmLzPIjLXOoFKfuqi8p+duJczR9qNp/k1GW/cR9Zsc32UKN305EY+CW0ZYeosEERdhecUAjaZYlHduPS5mKxhzNN500MP45YA/naJ80wSxH2vanMGieIAJL0Vl9xBlQ== 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=zMM85KVvjefkEU/EPZ96HSKeINoMFRZlKs5oXKWKuHM=; b=ZLvILoQAdNt1yqpDPgfcGINl/uSFd/FfApC/bohLsg2eeahi3Hv+gv3QgmFS9WJRTFNToZn0SXy2OoXQYU8HC/WHmuu6LgAOVUryZ54wyeOCeWwS3+wFggGomm0OglbvGLGN96KYj5NVYIVzd6ham406VJNs3Bg2nS6iWqhUWu9dSf2NOnxylGzHOyycfi/mj41lIcGvxpYxdgaimRJoMwHxqxfbjy0tTCtjTdfJ3miSv6EXp74E8WM5mzeEk6h3FVsLW6NuSPmqjnUHjvzR7YbSaHok/gL9qZG4g/yf22XqViPJ5x/vUDFTzPr3isqTe/zkEwj4mavwIjFE2lKztg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=zMM85KVvjefkEU/EPZ96HSKeINoMFRZlKs5oXKWKuHM=; b=zqT45sOffS8f1+fTK3t3M9RN1UgahCVFy9O+b5UmBRgR5OoFyOZytyMIQw5tOvc/3Tbx6oLJt4Xj+K9sYZMYM3SvcckQsKldlWiEfNoiGq/zrbcCfQQo5ZUV9yK7Cc4NDYpEAK6fwpgkllzeKEZMwcAH1K3iuSxMWqZQTup/jkE= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CH3PR12MB8658.namprd12.prod.outlook.com (2603:10b6:610:175::8) by PH8PR12MB6890.namprd12.prod.outlook.com (2603:10b6:510:1ca::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8792.34; Tue, 10 Jun 2025 11:33:24 +0000 Received: from CH3PR12MB8658.namprd12.prod.outlook.com ([fe80::d5cc:cc84:5e00:2f42]) by CH3PR12MB8658.namprd12.prod.outlook.com ([fe80::d5cc:cc84:5e00:2f42%7]) with mapi id 15.20.8792.040; Tue, 10 Jun 2025 11:33:23 +0000 Message-ID: Date: Tue, 10 Jun 2025 17:03:14 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/2] sched/topology: improve topology_span_sane speed To: Leon Romanovsky , Steve Wahl Cc: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , linux-kernel@vger.kernel.org, Vishal Chourasia , samir , Naman Jain , Saurabh Singh Sengar , srivatsa@csail.mit.edu, Michael Kelley , Russ Anderson , Dimitri Sivanich References: <20250304160844.75373-1-steve.wahl@hpe.com> <20250304160844.75373-2-steve.wahl@hpe.com> <20250610110701.GA256154@unreal> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <20250610110701.GA256154@unreal> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PN4PR01CA0089.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:2ae::7) To CH3PR12MB8658.namprd12.prod.outlook.com (2603:10b6:610:175::8) 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: CH3PR12MB8658:EE_|PH8PR12MB6890:EE_ X-MS-Office365-Filtering-Correlation-Id: 93b1d904-4567-4ac3-f3d1-08dda8129ba7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?utf-8?B?anZzZTl6aUJiUjIyUmJhYmgvNXMvSUVmTkVsRTdaL2p0NFhZakxjMCt4RWtw?= =?utf-8?B?bWpGS0ZLbm4wbThCQURXdlpia1loNTJTcXBKaEdPVGFBaHFxWXdhcHhpckx3?= =?utf-8?B?eUdNbGJ6OFdxUGdLWW80TVZHczkvdUduVGlabmpsTGhvQ0UzZkQ0akdqS3Ey?= =?utf-8?B?UnNlQUVZcUNLQVdnSWRlK1VNZkdVdXdaSEthcEsyYWxxb2JYNExlTFBtTlpu?= =?utf-8?B?T1hleG5wa29ZR3JrUlZML2c0NFd0bDlpdERwR2cwK1hBZW9XK0JEeEh1ckxF?= =?utf-8?B?MXlpSXlTaW5iNDBGcWpJME03bWdiMTd6L3REa1JrRWRrYzZiMFRITjFhK05z?= =?utf-8?B?T3RuajNBNlBHSTh2WnJTS1dUQzh6bDFaSEhrS0QwL0F0anRuMGZWcU1uY3NZ?= =?utf-8?B?anh4N1M5bXhQa0JMR0pMbWVxYjBCcjJmdmxhNHlmUzRSRHh5eUlsb0JXMHdD?= =?utf-8?B?ZUlMNDlvbi92WVg2RE1Qeldvb3RTVlJXVElqNnVBWTA4M1F6anJINnBuYm9P?= =?utf-8?B?T3F4bDZFcGJ0d29WVVVtNW0wNjVNSlR4YjQ4L2RxUGtvQjF6WTJJNzMyWUFJ?= =?utf-8?B?WDFaeE5EaTd1Z0ROY1lINHpFT2R5eFZKMVYwYkc4TlQwR1hreURoanNXTlM4?= =?utf-8?B?RzBPb3BlVlRBTTFZQVAyWFRtdkViVWlqOUVWZWpINzY5S0NCSTRVT0NkMFhQ?= =?utf-8?B?ZDdVNnpyTXhaUnlYU1RWalFlZjlOekxNYnB5ak9aeEk2UExrbVVZWVphMnRD?= =?utf-8?B?VkVQQnArWGQ3V09UWUJjOEpwZDBDSjM5ZlVtN3FpZVpJdjg5R2NlckZIWlpi?= =?utf-8?B?ckNTeldSQjdFK1lMTU1DUlc0UWFxL21tYXFGeWU4aDZ0UzR3d1gyekp2L0NK?= =?utf-8?B?QzZEYVpTQ3FJd0UxWW0yK3ZoTWNLeXFPendUbmRmNXplcVlnSGswL3Uvblgv?= =?utf-8?B?WEhBNnh0b09ZLzZCdnFyRVlQNEhRT2trTlFJMXlHZ1ZzamtPcmtIUFRPZ3dQ?= =?utf-8?B?SkRBUmtOYTZHbk9wcXdKT0poVlFVQzVrSkszT0l3bG92Y1pkN3FQbTR2UEhi?= =?utf-8?B?cm4xRy9zQ2xob0JVbnQrY0JsbEdVMGt1RW5CUDh2MmhhdnRLY0pOSTd2YnF4?= =?utf-8?B?N3JvUmtGdGJSTzBtNU9PZFh3Vlk4Tmo3VlhSOHZnUEpvc08rTElPN3dwaWVs?= =?utf-8?B?SVoyMnpRcXZJcXFXV3dIZnFYQjZZTHdmUGhhR0hzT2lIK212SXdmN2FmVjhM?= =?utf-8?B?ZjNyWHBJTE5UMnN1czJtRWxJTC9HbklJUlNPNmtieEtEdDhrbTJPdzJ0eG9y?= =?utf-8?B?dk1PMHVjMU9LWmpTMm4xZXc5RWpCQnJXb3Y4SkxaVkkxWWJzeS9mZFpJSW9D?= =?utf-8?B?eWZGQ0dvVCt6ekpiOTVHa1JDWWRieGpZU0NGK2dWYjVPS3JMYU1HUjhaM2ZW?= =?utf-8?B?NktMWklBenFvQzJ1ZE1QdWtlZFZuNUhva082UEg2VUc3Y0kzdHd1TGFFbkNE?= =?utf-8?B?aG1IbUdDM3ZyYVp0VHRER0gvNDFZRXR0ZEtmVExOMHdEL2NqZXR0VFY1Z095?= =?utf-8?B?TFdCdDIwdVBYdjhtQkYvYjdtQk80aXF1T2RiZCtoUjB1Qy91bHFJVkc0c2k0?= =?utf-8?B?Uy9VZ2VSTmVjUTNnQlNWUzMxWVFWMzJIeFlNczV1UGhMazhNZmpHcTNsR0VP?= =?utf-8?B?MFo1UVlDaXRkWCtmdlNudTdpYW5IU0pBd0phckFLL2V3bFJzblVLdlRpSS95?= =?utf-8?B?dC9VSUZ0YW91VVh4UkpjdU5DNnNjUEdtWjd3NnpURWZ0MHhGMk9ObHVDK3V1?= =?utf-8?B?bUlNa3F4cmNJeVJCbEN3aXpjZHFwZjBsakZQTjdRQkM5Q0FDQVVMTUoxa0Q4?= =?utf-8?B?VzJvZVFVbHM0L092cENvRU9ib0RUb3pQWVIwODhxYkZiaHZsMkY1aC8vS1VC?= =?utf-8?Q?ema4CrXOQ1c=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CH3PR12MB8658.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(1800799024)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?NGorVjV3NGpVM1BLRkxpdklJSk10VDQ4ZVhsUEp5RUoxQ2VaR2JSUUFEYnkr?= =?utf-8?B?aGpqZ1hUZW9mL3I3R1lJSnk0VDVNa1d5MDZhbStkK1E0ZXo2dUZ1c1lxWW9x?= =?utf-8?B?TDNiM0c0RFdselFDOHIyeG1IcmhMdnE2VEY1SlNGMEkrUEJZOUpHb3RWUndE?= =?utf-8?B?SFMzYndlakcweUFqN3RkYXpBaGpqdi80VGtOcS9YbTdCSkJDWnRQcjAyVFRB?= =?utf-8?B?K09USnQxcG15emZFWXcrZlZNcE0wb0Y5RzI5YVRJRzBRVkFJNmpPVFgxMXBp?= =?utf-8?B?T3ZrOFhnekkzU3FEUzJhdnh6cUFsZmxCcmZMOU9mVGJQWG9CWGtMMmV0RVBs?= =?utf-8?B?ZnhYWnJMbmhZay9sUGRVZFZFMWpsQVNXc1p1TWkxYjlHaWxCWEgzeTduYXhw?= =?utf-8?B?bmJVM2tLdjVDcTNBWDBmR0lQSnB2dkc5VlFtZmNjRy85OGZrSXdOT1h0OWxv?= =?utf-8?B?bkVIUnpPNFBGNWRtR3Nwa2ZNUThvUDRiVXBUdFl3K1I1ODdnMU1Dd05VQkhT?= =?utf-8?B?N3pkb2hDbXZqMXlKbDF4Ynltc0hrS2VWb2NBLytzdjVDSXBPZWNLbjByYk9V?= =?utf-8?B?Y1V3M1dSRnhNSDk3UUI1QTRORy9Ea0w2NDQwaDJ4clJNWENWK3NjZTNDVmZ3?= =?utf-8?B?bmJKQlN0TWU3VGhMcFpsVGw1REJGUmJuQzdZZFNmMERqRkdHdWRISGJ6SExS?= =?utf-8?B?azJNMGpMS0ZIbDU0K2dPSjVwNDZ6bDFoYUJ1cUd5OXIrd3p3d1hLYVUrVFl3?= =?utf-8?B?MDY1Y2VKcklmOFVRYjJlU2Z6SnNqbXBXVmo3RGs4UVlMRlM4U2dBeDF3VHhO?= =?utf-8?B?WjY4UWRIdVVZYnd6elorZDdOcHBjK2ZUMk03UjJUQU5pTVlIZzFWY0xMVU9G?= =?utf-8?B?MGdMSWJFYkJXUkg2WHc2eG9IbUxteERLeXRxNVY0Zm5WRVFTbDd5TDZHdGRx?= =?utf-8?B?N00yTHB1ZWpGdURWclp2dk5XRWJsNDdTdEt0STNJWGVzWXpPQ0creW5hOW5I?= =?utf-8?B?OVdhK1hsbXdudWpYSllWa0VXL3ZacDRpMXcvQ0JuQ2I0ZDV0cXQrMnZVYlJ2?= =?utf-8?B?cm4yRklYRFZQZ3FCejlEd3VnKy9uYVp3dmV0QmJiNlliOFV1ZjYwTkpXTzJl?= =?utf-8?B?MTY0dWEzMk9uN1R5ZEVzcG9xc0VCc2RJU0x5emlxYXVHSWpWenk1TGRDQjlQ?= =?utf-8?B?T3JwNFJoanlBZVdoNnkvYU1JdlMwd0tJVXpOQlpabkdNZmh6c3Rqb3RXa1U1?= =?utf-8?B?Q0RjRkpBMSt5R1JQeDJhMGErTE5KVnczclFTa1ZNUEd6bC9aY1FleXpPTExh?= =?utf-8?B?V2pKeEo2YzVVbTl1Y1BIREUybDBzTkdSLzNCck05UFNRYXJnalBuK3lGUVFV?= =?utf-8?B?OW4vK0dxWG54NUVBTWpwQlVQS2Iyak5EcEs0c2M1enUrbWxhdkZzLzBhMDhw?= =?utf-8?B?QVlpTmkwcFMwVVEvNXZoay9PUjhzemJ2N1NxcEF2aDlVMElMWEFLUUlDdjI1?= =?utf-8?B?K0ZHVVJJcGhLWkk4VEk1RnlQVmp0cWVPRmtLVmJ2VGxRRFJRMWNIR0dLeGpZ?= =?utf-8?B?WmdsSVRBVlJpNFRDRGx1UFowUzZVK1V1R2gyTGh6aTBSeUZrUWNIWE00Y3Zr?= =?utf-8?B?M0pQTVEwRk9BZCs1MlFZdG1kWFFPR2xMUkRMWEpka2dSZzdBalRnNVZoVnJp?= =?utf-8?B?cE1EdzhwblpZZXZqbGxWaTJzZGRDdlllc1c0REJ5WUttY21YZWxSejZGbENZ?= =?utf-8?B?R0FkZzkrVW5Gd21sYVBORy9GQmgwK2Mwam9LUVhOVHJIUmRJY2JnbnduS1Nq?= =?utf-8?B?VndFdXdiYVo4SE8xd2VRVUFWTXIxV21OVTNXUXp4WmtBcHo2MERaMlRjU2RK?= =?utf-8?B?MERxYXJ6YXFnMzZ0M0N5ckttRXYxZEFsNTFqSDV0MTltKytUNGZ1VXFlVktr?= =?utf-8?B?L0FJTWN6SURrVEJFaGR1V3ZCcmVuR2c2NmozOWswNnZaN3BLak5SNUdBTm42?= =?utf-8?B?WklsMzYzMG9IS0REVnFtWUhQaE9xZHFCa3pGYUtKSlMxNXdQWlpIS1E1SWZV?= =?utf-8?B?T3lwL1VCQnlpbEpLRGk0aEw3SmtMNnNtcktqR2FjL2pwdWNqaURKNFBvNFdJ?= =?utf-8?Q?a0KK7eYKDxGd1oVjTeeGlyU6+?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 93b1d904-4567-4ac3-f3d1-08dda8129ba7 X-MS-Exchange-CrossTenant-AuthSource: CH3PR12MB8658.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jun 2025 11:33:23.4921 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: y+iLf5VQjnI4sW1WBRr2EV/hB3hdRupoNo4s0sLc1a+thB9Sb69EWGQLltKTyqVt2EwvUxuooXwazA+5cYJH9Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6890 Hello Leon, On 6/10/2025 4:37 PM, Leon Romanovsky wrote: [..snip..] >> >> + if (WARN_ON(!topology_span_sane(cpu_map))) >> + goto error; > > Hi, > > This WARN_ON() generate the following splat in our regression over VMs.> > [ 0.408379] ------------[ cut here ]------------ > [ 0.409097] WARNING: CPU: 0 PID: 1 at kernel/sched/topology.c:2486 build_sched_domains+0xe67/0x13a0 > [ 0.410797] Modules linked in: > [ 0.411453] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.16.0-rc1_for_upstream_min_debug_2025_06_09_14_44 #1 NONE > [ 0.413353] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 > [ 0.415440] RIP: 0010:build_sched_domains+0xe67/0x13a0 > [ 0.416458] Code: ff ff 8b 6c 24 08 48 8b 44 24 68 65 48 2b 05 60 24 d0 01 0f 85 03 05 00 00 48 83 c4 70 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 <0f> 0b e9 65 fe ff ff 48 c7 c7 28 fb 08 82 4c 89 44 24 28 c6 05 e4 > [ 0.417662] RSP: 0000:ffff8881002efe30 EFLAGS: 00010202 > [ 0.418686] RAX: 00000000ffffff01 RBX: 0000000000000002 RCX: 00000000ffffff01 > [ 0.419982] RDX: 00000000fffffff6 RSI: 0000000000000300 RDI: ffff888100047168 > [ 0.421166] RBP: 0000000000000000 R08: ffff888100047168 R09: 0000000000000000 > [ 0.422514] R10: ffffffff830dee80 R11: 0000000000000000 R12: ffff888100047168 > [ 0.423820] R13: 0000000000000002 R14: ffff888100193480 R15: ffff888380030f40 > [ 0.425164] FS: 0000000000000000(0000) GS:ffff8881b9b76000(0000) knlGS:0000000000000000 > [ 0.426751] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 0.427832] CR2: ffff88843ffff000 CR3: 000000000282c001 CR4: 0000000000370eb0 > [ 0.428818] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 0.430131] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 0.431429] Call Trace: > [ 0.431983] > [ 0.432500] sched_init_smp+0x32/0xa0 > [ 0.433069] ? stop_machine+0x2c/0x40 > [ 0.433821] kernel_init_freeable+0xf5/0x260 > [ 0.434682] ? rest_init+0xc0/0xc0 > [ 0.435399] kernel_init+0x16/0x120 > [ 0.436140] ret_from_fork+0x5e/0xd0 > [ 0.436817] ? rest_init+0xc0/0xc0 > [ 0.437526] ret_from_fork_asm+0x11/0x20 > [ 0.438335] > [ 0.438841] ---[ end trace 0000000000000000 ]--- Would it be possible for you to boot the guest with "sched_verbose" in kernel cmdline and attach the full dmesg? Thanks in advance. -- Thanks and Regards, Prateek > > Thanks > >> + >> /* Build the groups for the domains */ >> for_each_cpu(i, cpu_map) { >> for (sd = *per_cpu_ptr(d.sd, i); sd; sd = sd->parent) { >> -- >> 2.26.2 >>