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Tue, 28 Oct 2025 02:30:17 +0000 Message-ID: Date: Tue, 28 Oct 2025 10:30:08 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [tip:sched/core] [sched/fair] 79104becf4: BUG:kernel_NULL_pointer_dereference,address To: Peter Zijlstra CC: kernel test robot , Fernand Sieber , , , , , 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> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <20251027140959.GU1386988@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: KL1PR0401CA0031.apcprd04.prod.outlook.com (2603:1096:820:e::18) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) 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: DM4PR11MB6020:EE_|CH0PR11MB8192:EE_ X-MS-Office365-Filtering-Correlation-Id: cf4bd14b-22fc-4c06-c9b3-08de15c9eeec 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' ? I had a try and can reproduce the NULL except at first run: [ 137.151416][ T321] BUG: kernel NULL pointer dereference, address: 0000000000000051 [ 137.152128][ T321] #PF: supervisor read access in kernel mode [ 137.152661][ T321] #PF: error_code(0x0000) - not-present page [ 137.153155][ T321] PGD 100b76067 P4D 100b76067 PUD 115fd6067 PMD 0 [ 137.153834][ T321] Oops: Oops: 0000 [#1] [ 137.154256][ T321] CPU: 0 UID: 65534 PID: 321 Comm: trinity-c1 Not tainted 6.18.0-rc1-g30682ad76ee6 #4 PREEMPT [ 137.155384][ T321] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 137.156509][ T321] RIP: 0010:pick_task_fair+0x69/0x9d thanks, Chenyu