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Wed, 7 May 2025 11:36:33 +0000 Message-ID: <67dac8ac-95d3-46fe-a384-7d56a9daac27@intel.com> Date: Wed, 7 May 2025 19:36:19 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] sched/numa: add statistics of numa balance task migration To: Venkat Rao Bagalkote CC: Ingo Molnar , Tejun Heo , Johannes Weiner , Jonathan Corbet , Mel Gorman , Michal Hocko , Michal Koutny , Muchun Song , Roman Gushchin , Shakeel Butt , "Chen, Tim C" , Aubrey Li , Libo Chen , , , , , K Prateek Nayak , Madadi Vineeth Reddy , , Peter Zijlstra , Madhavan Srinivasan , "Jain, Ayush" , Andrew Morton References: <20250430103623.3349842-1-yu.c.chen@intel.com> <8b248ff3-43ae-4e40-9fa4-ba4a04f3c18b@amd.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: KL1PR01CA0159.apcprd01.prod.exchangelabs.com (2603:1096:820:149::12) 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_|BY1PR11MB7984:EE_ X-MS-Office365-Filtering-Correlation-Id: 16541be3-f78c-44c7-514f-08dd8d5b6b0a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|366016; 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>>> mm->owner -> NULL >>> >>> Attaching kernel logs below: >>> >>> [ 1070.635450] rcu-torture: rcu_torture_read_exit: End of episode >>> [ 1074.047617] BUG: kernel NULL pointer dereference, address: >>> 0000000000000498 >> >> Thanks Ayush, >> >> According to this address, >>    4c 8b af 50 09 00 00    mov    0x950(%rdi),%r13  <--- r13 = p->mm; >>    49 8b bd 98 04 00 00    mov    0x498(%r13),%rdi  <--- p->mm->owner >> It seems that this task to be swapped has NULL mm_struct. >> >> Does the following help? >> >> diff --git a/kernel/sched/core.c b/kernel/sched/core.c >> index 96db6947bc92..0cb8cc4d551d 100644 >> --- a/kernel/sched/core.c >> +++ b/kernel/sched/core.c >> @@ -3353,7 +3353,8 @@ void set_task_cpu(struct task_struct *p, >> unsigned int new_cpu) >>  static void __migrate_swap_task(struct task_struct *p, int cpu) >>  { >>         __schedstat_inc(p->stats.numa_task_swapped); >> -       count_memcg_event_mm(p->mm, NUMA_TASK_SWAP); >> +       if (p->mm) >> +               count_memcg_event_mm(p->mm, NUMA_TASK_SWAP); >> >>         if (task_on_rq_queued(p)) { >>                 struct rq *src_rq, *dst_rq; >> > > Hello Chenyu, > > > This issue is reported even on IBM Power servers. > > Proposed fix works fine. Hence, > > > Tested-by: Venkat Rao Bagalkote > Thank you for the test. May I know if you could help check if v4 works without any NULL pointer exception? https://lore.kernel.org/lkml/cover.1746611892.git.yu.c.chen@intel.com/ thanks, Chenyu