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McKenney" CC: , , , Subject: Re: [paulmck-rcu:dev.2023.11.08a] [EXP locktorture] 1254a620b4: WARNING:at_kernel/rcu/tree_stall.h:#rcu_stall_chain_notifier_register Message-ID: References: <202312071506.6eac1bac-oliver.sang@intel.com> <2ad1abcc-d82b-406f-a7b7-606224a24813@paulmck-laptop> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <2ad1abcc-d82b-406f-a7b7-606224a24813@paulmck-laptop> X-ClientProxiedBy: SG2PR02CA0029.apcprd02.prod.outlook.com (2603:1096:3:18::17) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|LV3PR11MB8508:EE_ X-MS-Office365-Filtering-Correlation-Id: 890c9695-b624-4fd4-e316-08dbfab6fd45 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: BnFryOJEOsLNENn+M1NMEZ00M7Xx0mCfL/soxTJfQVqGGC9uHKL4ctuzO4njnZdG5gSDyhkWVtav8dPLHWgmiCzI/4noBDTkWGyqEk3gqpy/f0AXNIn3PrzG9yBI8060eF6T7w83n1daBLCtBUk54onrRB7XLN4pG1nbDaKH7L7j6EjYME9eFVo2S8IOU0nrpq4WQkwX4t++CbGFAuIzrV0udWH7DekxX5AJZdDMkQ6hyobUMQsgSNEWRFtLaxz9LYfymMFHzqE1UkTpF4kV9UHCYclMx/P9cRI3rlvHWOOnXJi0ZCTbZqK9wV/3N7WPjV8Y6BdN1plh9CwTA+yyy0kXoTti7UwMOq3u/EzKfh4uCMX78VxFnZA09PCKhJUkqyE6UfcTvfE3ekCEOu6f8meh8cOeZBj/ud4y5JW8dx0C+vg7cZxsYzkRvSxPiKkRniloer/ZglgIpznuiwnMy2V883LX6p7rRM1VDea9PIkR48wvwVkXTKpUMV0l8QUGjHLoLm43xuc0n7ttpDLWfiG+dwiYwrM6BRBaqN+TvDsIvUQqIdsk+fKDkinaPqvCC9pWq5g6kJpr2v1vLS3srNiLoKSxhf6xseKxQLyLpT1BI94XjnO1pWM5fHk8Nt3t X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV3PR11MB8603.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(7916004)(376002)(346002)(39860400002)(396003)(366004)(136003)(230273577357003)(230173577357003)(230922051799003)(1800799012)(451199024)(64100799003)(186009)(44832011)(8936002)(8676002)(4326008)(6916009)(66476007)(66556008)(66946007)(5660300002)(2906002)(316002)(33716001)(6506007)(6512007)(6666004)(9686003)(478600001)(966005)(6486002)(41300700001)(38100700002)(86362001)(82960400001)(83380400001)(107886003)(26005);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?2rpd2mNpNzhqrFKZlYmeK4IYamJbxZ16V3u/41a5RbCc7jjcFNF4p0GT4bQJ?= =?us-ascii?Q?YfgoyJ4isdbKuUmc2PqxV3FpwsVrKvy3l1NAXRj62rNt3OAGyu/sNBghorSb?= =?us-ascii?Q?/ymsYfANWWGTJv5+jNMxv1Xi9oJM4fZO+y5SQ4URsWXAut1bBMs4THSAGOCo?= =?us-ascii?Q?pLqgOr6Vbc/Mf4Dmmq+68fACtQsEJf5wmm6A8iWjI4956KBZIoNLlWAdY55T?= =?us-ascii?Q?mHVl1cl2QIBiOrh48rpYRGxuajIGDA4lTXdNcdsx7jB6M06OwUByH6iKqRb2?= =?us-ascii?Q?k7jUQRl524LaxNiRkzK16T0AHCgj6ZIqoJn00l3KZP+IiBohF5akPWQt2767?= =?us-ascii?Q?KJH5am0jD9o6i9f1U51P7hlXUZwxdgw7xesn9KbMPnCLSVcI0B4S0n6QDG69?= =?us-ascii?Q?neFprIsq18dsM/QQHWDHmdIu4MzhKnJw/XOdIUOqTI0DdKEkR5T7u2UIjwWU?= =?us-ascii?Q?/ZiETTwBBYwmv7/8w44Y25MkQUReJYvPrl7Vs33CTme3FHVH47RBTBT1LRAB?= =?us-ascii?Q?UKOziYlGaBvq0VJIpUkt79bsoe+Vtra6vKYJdeOb94I9CEJygEB+o3eOIvT/?= =?us-ascii?Q?KngbjmD3j1TR/9iLSeWcB4q09w4CFmAklB13rpO11iKLM9d4huyqotkM5Gb8?= =?us-ascii?Q?P8SpJWkkZd7bR11EEqf9Zx8GkJs2tE/AKrPaBfJ4U+HoLWx+SWAGyxWlzRlW?= =?us-ascii?Q?lUgmcNpCRGalmlao7/0yW4plwn8CTCzxTC5Rx7n+UbXN7I2QdnxxSzpxRLeg?= =?us-ascii?Q?kBWFZ5kzVnoz/1BltxAEdvdpyEns2PxpvEGxO7EZwyEyJ3RiFQ/iIswWrO7y?= =?us-ascii?Q?BCpJKX210rNobkrETIO9RO5c9bvV6n9kRJV1hDI8mXWoRAY/GAJXonpkX3uX?= =?us-ascii?Q?BO3Asi/s1lBYn8ZoaymojSpmL4uqdj9Nh7WDVsjR8PExQqrq+OUa1mxEzQMU?= =?us-ascii?Q?qO30Yz0qzmuLxXRGUVf2yC6PT1kg7U2pn6Mo6lInv4nH9LuFRGKs3kSZSQg/?= =?us-ascii?Q?ucwSofTLVaM1ZBYPCg79zcvfX7OXBcN9/+00lRkhlZg+p/3b3u6hzz/t1wog?= =?us-ascii?Q?AeaxQbXtH7E+XTETppV61bP2RbNf79NLUS9SMBxkXeP3lT/Lvjh9zo+vw/9t?= =?us-ascii?Q?nlq0YDcSviOIMB5nZxZlKY74CfzooV+qqZFWgTAVlYgwM5Zz17fcCmXvczTV?= =?us-ascii?Q?IB6EcdAIUn4IwVwOyDQKMPHomhnAnjBvkKcGk7Px2o9d85q7QFgDSIgPOJaG?= =?us-ascii?Q?Iltnq40R08STddeUevYUyCm1jJ8K4xbJm+PzvucH+3leQWS2uBx8Ikq/zo7i?= =?us-ascii?Q?7jpUULfsQb/lQ3vVNPXmFSqdbI0x8vdEJfETBgSFCVlYTVDI+m8nNAPFhgDj?= =?us-ascii?Q?AvXlEqvRxMAnBP2pJt7KKUe3u4HhV6mQBZnkJOk0CC7S4RUL3X0WSeGKF4Lu?= =?us-ascii?Q?k3BqUgWHk846Sy+o4crtvbcpNOHVYayzA/HQaZ/ovGHZpg5Q6NqTHm4oUFU2?= =?us-ascii?Q?SOViVqkTb7AJdSrtJt+ijTv+MxpBAiqc7+9+3qiMIiMfAFNU60ET4s0XlFQJ?= =?us-ascii?Q?2aQs/3f/xTCty9H1gLDhUfwCoNBg/8phPSgRe132CEuayjlzSJ1uVbUkTxAU?= =?us-ascii?Q?2w=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 890c9695-b624-4fd4-e316-08dbfab6fd45 X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Dec 2023 02:06:44.5096 (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: pdCmKKBti/ktqYiRxjr6vszw5GVOjEpb8eLBseBBQF1gG9rBW3lQi+BJvbMvAotuq1WSMSjfNIJ9yGR14rsdxw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR11MB8508 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hi, Paul, On Mon, Dec 11, 2023 at 08:59:16AM -0800, Paul E. McKenney wrote: > On Thu, Dec 07, 2023 at 04:19:56PM +0800, kernel test robot wrote: > > > > > > Hello, > > > > kernel test robot noticed "WARNING:at_kernel/rcu/tree_stall.h:#rcu_stall_chain_notifier_register" on: > > > > commit: 1254a620b4a3832e65ac01bcef769b99e34515b2 ("EXP locktorture: Add RCU CPU stall-warning notifier stub") > > https://git.kernel.org/cgit/linux/kernel/git/paulmck/linux-rcu.git dev.2023.11.08a > > Thank you for your testing efforts! > > This one is expected behavior by explicit request from Linus Torvalds. > The concern is that people might use this hook without understanding > the risks of losing RCU CPU stall warnings. > > One fix would be to never specify the rcupdate.rcu_cpu_stall_notifiers > kernel boot parameter. Another would be to forgive this warning when > that boot parameter was specified. Your choice! ;-) > > Thanx, Paul Thanks a lot for information! this commit (1254a620b4) is a test for this warning, am I right? when this warning mechanism goes into upstream, do you want us still report for similar cases? or we could just ignore them? Thanks!