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Fri, 7 Nov 2025 10:16:12 +0000 Date: Fri, 7 Nov 2025 18:16:03 +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: 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: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR11MB4165:EE_|BL4PR11MB8824:EE_ X-MS-Office365-Filtering-Correlation-Id: fb8ed30e-2959-47eb-5f87-08de1de6ad6a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|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. Some update that this one is resolved, the cluster run has set ia32_emulation=on in kernel cmdline, which is missed to set in the reproduce step. > > > > - job description is inaccurate in the amount of memory required. Got it, the cluster run with 16G has 40% rate (in about 20 runs), now i have increased the memory to 32G so it will reduce the OOM chance in local reproduction. > > > > The reproduction steps must exactly match what the real robot runs, not > > something else. Sorry for wrong reproduce steps, we should be more careful to make it consistent. And thanks again to Peter and Yu. > >