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Wed, 5 Nov 2025 12:06:42 +0000 Date: Wed, 5 Nov 2025 20:06:32 +0800 From: Philip Li To: Peter Zijlstra CC: "Chen, Yu C" , kernel test robot , Fernand Sieber , , , , , Subject: Re: [tip:sched/core] [sched/fair] 79104becf4: BUG:kernel_NULL_pointer_dereference,address Message-ID: References: <202510211205.1e0f5223-lkp@intel.com> <20251021110449.GO3245006@noisy.programming.kicks-ass.net> <20251027125453.GY4067720@noisy.programming.kicks-ass.net> <3b30e40b-f1fb-4145-b4d9-a9279b9602d8@intel.com> <20251027135516.GA3419281@noisy.programming.kicks-ass.net> <20251027140718.GT1386988@noisy.programming.kicks-ass.net> <20251027140959.GU1386988@noisy.programming.kicks-ass.net> <20251105110026.GI988547@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20251105110026.GI988547@noisy.programming.kicks-ass.net> X-ClientProxiedBy: SG2PR04CA0156.apcprd04.prod.outlook.com (2603:1096:4::18) To BY5PR11MB4165.namprd11.prod.outlook.com (2603:10b6:a03:18c::26) 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: BY5PR11MB4165:EE_|SN7PR11MB7511:EE_ X-MS-Office365-Filtering-Correlation-Id: 9986ca3e-9663-439a-42cd-08de1c63c7fa X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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Not > > > actually reproducing the NULL deref I was looking for. > > > > Change the following line in job-script > > export memory='16G' > > to > > export memory='64G' > > ? > > Yes, that seems to help. > > > I had a try and can reproduce the NULL except at first run: > > Took me two runs, but yes, I can see it now. > > Anyway, this is two bugs in the robot, can we please fix all this to not > happen again? Got it, I will dig into the detail to understand the difference of local reproduce and internal cluster run. The image, kconfig, and memory are exactly the same for actual robot run and provided reproduce instruction, since the attachment is reproduced from the job execution. I didn't find the cause quickly, and i will be back to this asap and provide update. > > - .config has 32bit disabled while robot provides 32bit images. Clearly > the actual robot runs 64bit images and the reproduction should > provide those too. > > - job description is inaccurate in the amount of memory required. > > The reproduction steps must exactly match what the real robot runs, not > something else. >