From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from DM1PR04CU001.outbound.protection.outlook.com (mail-centralusazon11010026.outbound.protection.outlook.com [52.101.61.26]) (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 4BEB48F4A for ; Thu, 27 Nov 2025 05:15:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.61.26 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764220538; cv=fail; b=qCfHtdW/L21CzAQrjiWBboh7aWyHggT728DUjn6XxZX5uvmA235eVOh5G2InT4F470XY1CP6r1vk3HFfqfCRVyL93GJyJMScIemPRmsTnbNMGRwY7+/0R4t1204jnvlEYw+wtwHkkkssWTmA36bHvm31LR6NINoTogEi4Y3sVwU= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764220538; c=relaxed/simple; bh=x6PUBtpgqXKSURYGQPDWTgdGkk83GNUMo8Z0t+tTbP4=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=DQr+0FtJjdvS8vjuTbv9rNBUndixXXuD/dK8lSfJ2f+9VyBg71sUQg/ZGTKDOVC7p700YJGoBEC7hpv9qRJAhhB1en5Nd7M5NeRsg/xbFynyncPnl1F3LlYPWLz3ABbCA4+NbuvGhtUlxIC3CKHveI4416KSj32CrYlM5lm96aQ= 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=IbYYw4ra; arc=fail smtp.client-ip=52.101.61.26 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="IbYYw4ra" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=AoHHsvi7/7FIzHeIoO9gAPoZ6QC/p6+ibnVtIiIiKditgSkTARX89JtEs3Xc+3RtDzCIpLtknVowlxSa6zK9xHRQUbQcMResxinh/+kOYAClWEJAEhxB0dbb2ZTs8en3ViYUS3rIOv2Zy3Y9nGiwbag0fdGuKfVlW3vovJDQ46VaeI8zssU4RjQkDmatxVYvVdEQq/N28IunN7aQQtcCzEz/INQtXJRGU3QlZmW2TuT9MkwKik0u1gF9ap4LjiDXZVZs3DchtN2vob82r5qjhEuzClXD9lVfMMgSEChb+vUIb7BejKxgUj8BWI/RMP/DNe4eKn3kgbxKY0w6vefISA== 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=yzMpnQxYWDzLVQQoapAdayEnJzs/frcnch18ufFqdTU=; b=NepUXPXUA/mKsmFwqaThys6+0feunQpwp3p1Yp6xYUYGCaxLxsbcQmsvVeVLEU8Geam5W7yQZqnTIFgrhJuVf6w3KuqpqmxzUM7Haa6J2jHILLmu/FjwDGNuwYSXt1bDuc8mm3sxaOSbRDwMoMmiSGCWlZpGaAxwtMn2F8lcBgXnzvTQKwpQG0zQ6+Ya4EffnjdnlhCFeYY0mBriKL8mwmmVlUNfJ9STNzvGDCRoMpSZ3xz5Vw5Q1HzmH4Tjg5LvMXRcqzChEGaJZkCBCUGJSgUlGGovC9JE4IAEV9mXFGSoN5A45ljXVtz8VffTTVkYJh+kOH+VdTakfUmZpQhzjg== 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=yzMpnQxYWDzLVQQoapAdayEnJzs/frcnch18ufFqdTU=; b=IbYYw4racZ+8EtWpi2+6llBnm86lFh6YmUqE6pl/5Dq1pQrRHJHSiBbHlYmaIS6UzD5xtxMz3bJQaLbVeILRWaDhhn21ZGLkluQPgIvTyXSbboExoA4S9/5PGhtUWtF4eOj9/Zm3WTou+OSmaenpNWve7+cohHG/Nm24NCmAnc4= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from DS7PR12MB6048.namprd12.prod.outlook.com (2603:10b6:8:9f::5) by MN2PR12MB4111.namprd12.prod.outlook.com (2603:10b6:208:1de::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9366.13; Thu, 27 Nov 2025 05:15:35 +0000 Received: from DS7PR12MB6048.namprd12.prod.outlook.com ([fe80::a5e0:9d7e:d941:c74d]) by DS7PR12MB6048.namprd12.prod.outlook.com ([fe80::a5e0:9d7e:d941:c74d%7]) with mapi id 15.20.9366.009; Thu, 27 Nov 2025 05:15:34 +0000 Message-ID: <499db877-2587-46cf-96cc-486ec66db3df@amd.com> Date: Thu, 27 Nov 2025 10:45:28 +0530 User-Agent: Mozilla Thunderbird Subject: Re: amd iommu: rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 8 jiffies s: 113 root: 0x1/. To: Borislav Petkov , iommu@lists.linux.dev Cc: Joerg Roedel , Suravee Suthikulpanit , Will Deacon , Robin Murphy , linux-kernel@vger.kernel.org, Jason Gunthorpe References: <20251126143219.GBaScPc1b6RAC9ZfCv@fat_crate.local> <20251126160031.GGaSckH3SHrC8ckPa7@fat_crate.local> Content-Language: en-US From: Vasant Hegde In-Reply-To: <20251126160031.GGaSckH3SHrC8ckPa7@fat_crate.local> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PN3PR01CA0109.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:96::22) To DS7PR12MB6048.namprd12.prod.outlook.com (2603:10b6:8:9f::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: DS7PR12MB6048:EE_|MN2PR12MB4111:EE_ X-MS-Office365-Filtering-Correlation-Id: 7387718b-b1ae-4c1c-d197-08de2d73fe55 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?YXY2Q3Y0dXB5a0FvQkdRVng0K2VLZFloaWlnaW9tTDUyVmsvVU12Vlk3aFJM?= =?utf-8?B?ZEtCVmZxcVNTM1g2cG4zTlJoRGdzM0RZam91bkJXdTY3TnI2UlhGbUVjb1d2?= =?utf-8?B?Wjd1MTNDbnZ5ak9zY2ZCTVBaeVNaYkFNeDBmQnJhd0ZuenVxeHZzM1lEaU55?= =?utf-8?B?Q2FPMWxCRitoMVJ4UTFVZHRhbEs5YzBEcGt5SnF5ZnhtcmlhOHFndUJSLzk4?= =?utf-8?B?NW8rd3VmMFJuaXNjbndnMGlKTEtkWkNrQUU5dmQveTRBQzAzejdLeFJ2YmR2?= =?utf-8?B?N1FDUlVBaGJBQldjUjY5Y1kvbUVLM09KUVhQcHVJOWhEL1QyOXdNR2IxNlZR?= =?utf-8?B?a0M3czY0TzZFVFBXRlhYYURwbDNHdHdDS2JOczd5TCtvbTNwVlRDZGhtWW5G?= =?utf-8?B?eExDNlBlQ0ZOYXZCZU9PWmxyUEVZMkNUTzl5QzBYVGNEZ1NQMUJPSVFUYWlr?= =?utf-8?B?MVJjR1FWTXR3VFBHd0FCaFo4Z1JLWUovNGNCd1BkMGlYT2Z5MFBBejNFRFk5?= =?utf-8?B?NFByMUVhVktRaXNvUVlYa2VQZ25xd2pqT2VjUlRtVlg1alk2MkQxKzl3MDNh?= =?utf-8?B?NEVWdFB0L25zd2JPNkZMRWdpK1VtNWU2dFVwMTdCamFVRzNjdUtzY0lnZGlZ?= =?utf-8?B?QU9zdzRpSCtIUGFwbVlJNzVRVzVSYXpoekMrL3MxSDcya1dTQnBOSTRKTU41?= =?utf-8?B?Tmp6akY4VVRNdE03aWRSOERPa2QzS1F4RGZONkVIVHlUNVFsVnRFR013RUM1?= =?utf-8?B?NVRVdWtBVGlsdGlIakFxNVFDMUxHdnJWZDNoS3F6UFFQNVhDQ09XM3Y4VS9i?= =?utf-8?B?WFhNWW44cFQydWJqYkRoL2VXODBpWWRCQmZaenRZazVFaENUZTBjYjBYV3Jq?= =?utf-8?B?ZXBDMWlmc3hEZjJQWUhQQXZQbWU3cCtOemU4TXE4TUYvK0tHQW9HYURWTU04?= =?utf-8?B?T1JPNXE1aDNrbEF1alA5MkZNZUd3WHVsY3p0aVVYVmE4SjFtSjNNQXpnekg5?= =?utf-8?B?UEhnMXlHcUdncXd4c1NCOWdzL1kwS0NseUM2d1FxcnY4TGFMTWZuNzZXMElu?= =?utf-8?B?akVEWSt1d0xTdnM5dEZGcXNYVmJxTDRhbEIrUnkzU3ZVTVZrbTdXelRtNmhI?= =?utf-8?B?WGg3ZFFmNFRrUkNRZ2JGWjZieFFBVWVpb0d4M0RDMFNUY1FyeGRtRW5IT3Bq?= =?utf-8?B?WDRGNXlSQy93bE96anUzQXlhT0RVS2JZRi93UXpteVdRdmp1TnpwcEtpWEVq?= =?utf-8?B?bGIrZWZvR2dzemdLUkZyYUxLdjVZNGtmc04ydzBlOU1GdllLZ1grVkFCQ1BQ?= =?utf-8?B?N2Y0RVJHWWJvM1FuSi82TnFqd1VqK3MvTGRoVGs3WUlJeHFkR1pBUU15Z1Zy?= =?utf-8?B?QUxNYmdoQ29WWHdQQ3B6WmlhR2tUYTVJY0dRckFRam1vbk55REx6MW9RelZN?= =?utf-8?B?U3pubGkrVklFcmh4RzFVemRMNGFYZkhQc1ZQSy9TMXNwbW5EMEVrOFFzeVlF?= =?utf-8?B?QlA1OEYxZzhMaFcyUHQxNGZGeDQzL2Zsd1VJSzFjdys0SGpxMnRqVlFEVTZ5?= =?utf-8?B?ekFDZjJFZnFLNDBwSlBzaFl0TjlDYmUwcTZUN2dUK2cyTUYvb2hYSkQ5dnVZ?= =?utf-8?B?WTdESUwxclYwQXhsWVh6MXAyeG9JTHZOOE9SNHpHZjlRV3lKNitJRTFCTWpW?= =?utf-8?B?T3ZvVkNrT1A3NDgvUVJIUWZNVGhqTHl6STUrZThMR2p1ZjJVZjVKUHYxZ05W?= =?utf-8?B?SkZEcTJlSkxVaUlCU3Rxa3NzcEIyOVdFSHBYbEhRR3dwWFJZUUdKa1VFRnpt?= =?utf-8?B?YnV0UnpORnBjUk9KZ0J0SEZMWVo4c0ttTEV0cGordnllTDNkNFF3blkyR1dV?= =?utf-8?B?ZDY4TkFPV0dEMjZWb3pRS3hkdVErRUl3NWNzcm5QT2t4cElBVExwRnRNdGNP?= =?utf-8?Q?Eqb3OISvjlp5IKeqGsTOvS0XA1Lzj2k3?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR12MB6048.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?cWVJRUJGRHZpRUZBem1CZTN2MSt6THJyWmZLd2hIQnY0d25YZWJOazFBTGNN?= =?utf-8?B?cHZyd3YvZ2ZKTWhPRE9sSXF4SlppSGFzcXVhWHFQRzZteXc1bWtqbWtsMjZD?= =?utf-8?B?YXduYVFrY3VVeUZYaFhodnU1b3VETWJ2ZnBuejRFSHJqMnF2R1grSWI2MTYr?= =?utf-8?B?alFZallRalhST1Yvc2Y4SC8vbUYza25JOTNRZU4zRy9pUU5aeVBxanpnREp1?= =?utf-8?B?NWpEekJsM0ZkSVczZFQrMlF3TThpb3laWjFXVHBVTzhqVEZHNjR4YVd2NVBF?= =?utf-8?B?MVVRMmR3SGUzQmVrcEFMaVN4MytNaWx0R0ovYTV4R3h5SmYwdkUyYkpHUlNx?= =?utf-8?B?QTN2bjVyOFRsd2N4TFB2MWhOMkVvVGYrMC80a2NSeW93dWhoM1k4VnhROS9i?= =?utf-8?B?dFpUZ0hLcVRPaUJXbTJRNGpjL094SzVmeFFMb3htc2lLampySjNJWEdsQTBM?= =?utf-8?B?KzcwZmlqU0F6OGk1VDV1bHZnWkhnZ3A2a0dkRitURGpVcGVCdDYxUVVndWlM?= =?utf-8?B?S2pSOXo5SlRTZVJPT045QnQzdzdUN1dzSnkvWlNRY3o1b2NvTzFOTmxwZ2g1?= =?utf-8?B?bG1Zb1V5QXpnUkFmWHdMR1NOa1h0eGlLMFcxandIWXhsb2c0bVRrd2hvTERK?= =?utf-8?B?aDA3am5naGVKUVZibjB6R0o4Q2VnYUNqclRwUy85cHAyYnJGVVB2ZUpRaG1J?= =?utf-8?B?R1NPdzFYNUowb3lRL2pCd205UHJHUlpoT2cvVDNZaG9HZlBNazl3N0kzUjc5?= =?utf-8?B?WkRFc0dOeXNFTEhEa1Vsb2hPNkVucEdkeW1zNGZiR3VCZE5IWmNkM1hoSy9t?= =?utf-8?B?VXlxSWNGRUo0Y1ZrSlV3ZEVXVHFGb3F4akdGMEdCS0dxaUo3RytBRmd1ZlRk?= =?utf-8?B?VzVsVTY3ZWllTUJBKzI1UzV6b1QvWmUwazZBcHRKdmhoeHF3UmYvYWVkNjZO?= =?utf-8?B?Y2ZWeE5LdTZiZFNNUDc4Z3NkZksxSXZSQVBYRGsrUUc4bHNNakd4ZzVUOXBW?= =?utf-8?B?REc0TlBpU0xLdXpNb2FDdnhDcEg1K0REUldMajBWTnY1TkQweDNhY0wwYkJS?= =?utf-8?B?bysyelQ1WDh5UWk2cXY4VkpUdGVlZjZOaUxnMkR0dEo5TnRpVlI2bFRDb1Vp?= =?utf-8?B?eU9rS3kzWk45djViU0tlblpCTEM2TUk3d3AwTDVrbm8wRFVhaWw2bFF2bmNP?= =?utf-8?B?d2l6RFFIbjRJdmI4WHhXYTlJazU4MWc4NVpvNDlxaGJNR2R2UkZ1MXF2c2VW?= =?utf-8?B?UzRzekNlQUwvUnlCWTYxRk56RVFqRTNFYnJYYXlDVzdoRGx3S0swUDlkaE9m?= =?utf-8?B?VU5hUHJqdnV4T0NCWjBka1BlWkdnVEs3dFFXZ2NCYzJqdEpPNmxua2Z2SHhR?= =?utf-8?B?RDdrRWxJTS9obGh2Q2VXZHh3N0Y5emJQcHZnSUdYOUU3OXRyQWJjdUROYis3?= =?utf-8?B?TmFSWjRIZDJiTlh5MWlXR05URzk2amlQMHhROXUvT1hFYUhvZmM1WEJHazhI?= =?utf-8?B?cExYY3RsZ3pjelNVM1YzdGxsdkdzVHFkb3N3ajJtWWIrVnB2LzBvb0NkZnFY?= =?utf-8?B?YW1FLzhLcU5MM2swb3FNa1lRMkRxRXA0cmNMTTJFN2krVjlJVWl3NXRlM3F6?= =?utf-8?B?Y3M3bXFBK2taMzloQmRsakJpRWxMclZmeEtjYTR5N2p1VEw2ZHZIUW1xL3kx?= =?utf-8?B?RWlHbnVMSUE1eVpObkRtTENvMWkwdklBa2FNUGtBR2hvZk1kYjlyeERzRzJa?= =?utf-8?B?aFdoOW9hZmNvanVKc1Q4RmVCWkpWUlQ2SFdKMkxRN3FNcy9QdkpITDFOK29x?= =?utf-8?B?M3djbzBFeEE1YnZNMUNPbGltSUxZV0I3ZHhXOTFnT1kzbzQyMUJuTHVHaGdu?= =?utf-8?B?MmQ0b0luTWh0dVhhQ01CUFlXREJKclJvQXd4KzNjc3J6RjdvQkF2dEVjcXJy?= =?utf-8?B?Sm9EM0ZvTDB1TEJnbTFOL2dFUlFIWXJnbkFVbDlGSWlQckc4SWVIMkNzQkln?= =?utf-8?B?WldDNU5SWU01L1BPWkVPY0k1UmllaWdsb1ZER3daYk1wc1ZLWDR2V1VuakUr?= =?utf-8?B?Vm10ZUJXY0FiMWIwSVBqSTRod3NtZVZ2VzFLMWZiT0U5M1k5cFZBeVc4SStX?= =?utf-8?Q?sHSZJ9JeUBw+wcBuMwbWvUzd1?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7387718b-b1ae-4c1c-d197-08de2d73fe55 X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB6048.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2025 05:15:34.8402 (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: x4GfIqQtPo3TJwWvVCLAYsnrTEMVDTViH5jA5VWUbIy7dKECHdS7UwduPP7uPZCryyhDBGIvMEefCHXUdNknxQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4111 Hi Boris, On 11/26/2025 9:30 PM, Borislav Petkov wrote: > + Vasant. > > On Wed, Nov 26, 2025 at 03:32:19PM +0100, Borislav Petkov wrote: >> Hi, >> >> this is latest Linus + latest tip/master. Box is Zen3. CCing AMD IOMMU folks >> because the backtrace points to it. I have tried tip/master on my Zen3 and I didn't hit this issue. Can you pass your config file? We haven't touched that code path recently and generally it should work fine. At least we shouldn't hit issues under normal condition. Having said that recently we observed that under really stressed environment we hit softlock in the culprit code path. We are working on moving wait_on_sem() out of spinlock. -Vasant