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Wed, 22 Mar 2023 09:37:01 +0000 From: =?utf-8?B?UnlhbiBYaWFvICjogpbmsLTmnpcp?= To: "tj@kernel.org" , "peterz@infradead.org" , "vschneid@redhat.com" CC: "linux-arm-kernel@lists.infradead.org" , wsd_upstream , "linux-kernel@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , =?utf-8?B?WW9uZ2p1biBMdW8gKOe9l+WLh+WGmyk=?= Subject: BUG: HANG_DETECT waiting for migration_cpu_stop() complete Thread-Topic: BUG: HANG_DETECT waiting for migration_cpu_stop() complete Thread-Index: AQHZXKHaCEisPEX/hka7ctaBtar8UQ== Date: Wed, 22 Mar 2023 09:37:01 +0000 Message-ID: Accept-Language: zh-HK, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=mediatek.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: SEYPR03MB6626:EE_|KL1PR03MB5836:EE_ x-ms-office365-filtering-correlation-id: fb54c432-576e-4710-0f7a-08db2ab8fd61 x-ld-processed: a7687ede-7a6b-4ef6-bace-642f677fbe31,ExtAddr x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, We meet the HANG_DETECT happened in T SW version with kernel-5.15. Many tasks have been blocked for a long time. Root cause: migration_cpu_stop() is not complete due to is_migration_disabled(p) is true, complete is false and complete_all() never get executed. It let other task wait the rwsem. Detail: system_server waiting for cgroup_threadgroup_rwsem. OomAdjuster is holding the cgroup_threadgroup_rwsem and waiting for cpuset_rwsem. cpuset_hotplug_workfn is holding the cpuset_rwsem and waiting for affine_move_task() complete. affine_move_task() waiting for migration_cpu_stop() complete. The backtrace of system_server: __switch_to __schedule schedule percpu_rwsem_wait __percpu_down_read cgroup_css_set_fork => wait for cgroup_threadgroup_rwsem cgroup_can_fork copy_process kernel_clone The backtrace of OomAdjuster: __switch_to __schedule schedule percpu_rwsem_wait percpu_down_write cpuset_can_attach => wait for cpuset_rwsem cgroup_migrate_execute cgroup_attach_task __cgroup1_procs_write => hold cgroup_threadgroup_rwsem cgroup1_procs_write cgroup_file_write kernfs_fop_write_iter vfs_write ksys_write The backtrace of cpuset_hotplug_workfn: __switch_to __schedule schedule schedule_timeout wait_for_common affine_move_task => wait for complete __set_cpus_allowed_ptr_locked update_tasks_cpumask cpuset_hotplug_update_tasks => hold cpuset_rwsem cpuset_hotplug_workfn process_one_work worker_thread kthread In affine_move_task() will call migration_cpu_stop() and wait for it complete. In normal case, if migration_cpu_stop() complete it will inform everyone that he is done. But there is an exception case that will not notify. If is_migration_disabled(p) is true and complete will always is false, then complete_all() never get executed. static int migration_cpu_stop(void *data) { ... bool complete = false; ... if (task_rq(p) == rq) { if (is_migration_disabled(p)) goto out; => is_migration_disabled(p) = true, so complete = false. ... } ... out: ... if (complete) => complete = false, so complete_all() never get executed. complete_all(&pending->done); return 0; } Review the code, we found that there are many places can change is_migration_disabled() value. (such as: __rt_spin_lock(), rt_read_lock(), rt_write_lock(), ...) Do you have any suggestion for this issue? Thank you. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel