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Thu, 14 Aug 2025 08:08:10 +0000 Date: Thu, 14 Aug 2025 16:08:00 +0800 From: kernel test robot To: Julian Sun CC: , , Julian Sun , , , , , , Subject: Re: [PATCH v2] block: restore default wbt enablement Message-ID: <202508140947.5235b2c7-lkp@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250812154257.57540-1-sunjunchao@bytedance.com> X-ClientProxiedBy: SI1PR02CA0026.apcprd02.prod.outlook.com (2603:1096:4:1f4::11) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV3PR11MB8603:EE_|IA4PR11MB9107:EE_ X-MS-Office365-Filtering-Correlation-Id: 07635e1a-3a48-4eaf-1ff4-08dddb09b553 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?J3aZXnXmyp4irdoBIrzQCxy71yuzomwhKKJaQM1MKMkHjh31SMaQ4Qt29w/3?= =?us-ascii?Q?9aJg5LLXGAbBpWFemjy/8VGT4UYsstKVZ+uUWlk9ZueZEpQlJSIIGsEHEGC1?= =?us-ascii?Q?wbx+79H9j//JZF/H/tFqqZJiCXN1x0hC3rX9OKO6+ZOtZ2wsfxPtEL9CQ0Zv?= =?us-ascii?Q?hec4Q6gD1DT6qiEIuJtJX0uLLbK/vv4PD24qSC981gGxdHumM0C7ieIsMjAw?= =?us-ascii?Q?JqtswEG75rhz/lhcQ2YjsZ4iOgFOFBgAcDRiTPOu4TNYJ8YRAor37tkeUUNt?= =?us-ascii?Q?idpxMozFukrg0DvNE9HiY7RbISREq/RZ9n4WWnlu/bm68CjRgfEK9y4rcR+w?= =?us-ascii?Q?W73X9pnIi4ucAhlOmUZthLLTGGkdGQMFu/SIhe1cHLr1KodtTNtQ9Z+qZOd9?= =?us-ascii?Q?0Vh5OF2AocM7l4tthKP5dt9Z4RWgrUmpPffMv9tc7VjV8O7xSTQK0v+Oc07R?= =?us-ascii?Q?ucC+bUpU6hIGTmXh4iPqpT8aTMFbNQK+uwShV4ma9hLquuzj1ZLh1eVlFY0L?= =?us-ascii?Q?A1l64jTBaW3HMsBRRK4TdNnFCJuyJaWwjKgcJ7RB337+VAaLJNOxn29aOgIw?= =?us-ascii?Q?lBIG2s44cYUBfoO7uxXIsDbaa/9xzk7+B/A+iXj/2a8R5xyxlmZ8a0r6OZjR?= =?us-ascii?Q?r95tch9jOKyG3X1K6xIFmMcsM3DzMRtnKKWA2YtTTubAxlxzl3U76KG0MKnr?= =?us-ascii?Q?TR4kuULQpIV7fdFLcuClcUIgoD3IODfETPJzCu+h9bzdbhUGlYsgWdlmwXo/?= =?us-ascii?Q?U5xKa6NuXLxKuhMM5EPdW0ekAEnpFbp9oOzAiC6X9e1IY/bHIX8++LHlZifp?= =?us-ascii?Q?FDjRbrMZ4v/livYyCRkCOKj/0hE2sTw3vFN9fRzuzAisA9ilBZQdAddaq8qx?= =?us-ascii?Q?LXk7+UbCQt65zVTOUcNRd2HAUxyrSTLvsVA8UGmiWaN7WkCyMQhjoWI3cNxI?= =?us-ascii?Q?9b98vXfAi/+Hnj9ot21KYm9FCaZt693w+MRcpiaCT5nyMQ9m2/pyG2hojeF6?= =?us-ascii?Q?FvzjYAUgbODQovBu3F15CyesyTNcmuEBlFSWfm31MMM2a9Krp6GIi9SywDlQ?= =?us-ascii?Q?DjT6bBqzVrPGvnWkTiQPoRomScxkciuJQdmSLZxv5wMluHxHHNbpg34ScW1R?= =?us-ascii?Q?6TTfNIZuYutaTKv26IgGgHuOGWuLrQb6KGGaC2AGjrk/Hok9/z93l2/jRFon?= =?us-ascii?Q?QCGWnAlsGr3bbe6B9kUeXHsUcPguVKM1IwnPlTRcigSCBAR6+tzHvHDppDgp?= =?us-ascii?Q?qdkE3Yq+oxh2na5xKA2jmVaJQjStqa+CynBCu4JrWyc/jf/BQUHOC1Mr9l4U?= =?us-ascii?Q?Cc3ZmVj/rloXqufF0UQGh5GQEa6XhPBHP8Wa80D3+6AFYUja4IPj/dAbvfM3?= =?us-ascii?Q?VhmVnlKb0PY9yQKErW2TC4vbzgaH?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:LV3PR11MB8603.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(366016)(1800799024);DIR:OUT;SFP:1101; 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[ 1.575968][ T1] [ 1.575968][ T1] the existing dependency chain (in reverse order) is: [ 1.575968][ T1] [ 1.575968][ T1] -> #2 (&q->q_usage_counter(io)#9){++++}-{0:0}: [ 1.575968][ T1] [ 1.575968][ T1] -> #1 (fs_reclaim){+.+.}-{0:0}: [ 1.575968][ T1] [ 1.575968][ T1] -> #0 (cpu_hotplug_lock){++++}-{0:0}: [ 1.575968][ T1] [ 1.575968][ T1] other info that might help us debug this: [ 1.575968][ T1] [ 1.575968][ T1] Chain exists of: [ 1.575968][ T1] cpu_hotplug_lock --> fs_reclaim --> &q->q_usage_counter(io)#9 [ 1.575968][ T1] [ 1.575968][ T1] Possible unsafe locking scenario: [ 1.575968][ T1] [ 1.575968][ T1] CPU0 CPU1 [ 1.575968][ T1] ---- ---- [ 1.575968][ T1] lock(&q->q_usage_counter(io)#9); [ 1.575968][ T1] lock(fs_reclaim); [ 1.575968][ T1] lock(&q->q_usage_counter(io)#9); [ 1.575968][ T1] rlock(cpu_hotplug_lock); [ 1.575968][ T1] [ 1.575968][ T1] *** DEADLOCK *** [ 1.575968][ T1] [ 1.575968][ T1] 5 locks held by swapper/0/1: [ 1.575968][ T1] #0: 43d11208 (&set->update_nr_hwq_lock){.+.+}-{4:4}, at: add_disk_fwnode (block/genhd.c:597) [ 1.575968][ T1] #1: 463429c8 (&q->sysfs_lock){+.+.}-{4:4}, at: blk_register_queue (block/blk-sysfs.c:889) [ 1.575968][ T1] #2: 463427e0 (&q->rq_qos_mutex){+.+.}-{4:4}, at: wbt_init (block/blk-wbt.c:925) [ 1.575968][ T1] #3: 46342678 (&q->q_usage_counter(io)#9){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave (block/blk-mq.c:206) [ 1.575968][ T1] #4: 46342694 (&q->q_usage_counter(queue)){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave (block/blk-mq.c:206) [ 1.575968][ T1] [ 1.575968][ T1] stack backtrace: [ 1.575968][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G T 6.17.0-rc1-00012-g555859c514d9 #1 PREEMPT(none) [ 1.575968][ T1] Tainted: [T]=RANDSTRUCT [ 1.575968][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 1.575968][ T1] Call Trace: [ 1.575968][ T1] ? dump_stack_lvl (lib/dump_stack.c:123) [ 1.575968][ T1] ? dump_stack (lib/dump_stack.c:130) [ 1.575968][ T1] ? print_circular_bug (kernel/locking/lockdep.c:2045) [ 1.575968][ T1] ? check_noncircular (kernel/locking/lockdep.c:2175) [ 1.575968][ T1] ? check_prev_add (kernel/locking/lockdep.c:3166) [ 1.575968][ T1] ? validate_chain (kernel/locking/lockdep.c:3285 kernel/locking/lockdep.c:3908) [ 1.575968][ T1] ? __lock_acquire (kernel/locking/lockdep.c:5237) [ 1.575968][ T1] ? lock_acquire (kernel/locking/lockdep.c:470 kernel/locking/lockdep.c:5870 kernel/locking/lockdep.c:5825) [ 1.575968][ T1] ? static_key_slow_inc (kernel/jump_label.c:191) [ 1.575968][ T1] ? cpus_read_lock (arch/x86/include/asm/preempt.h:80 include/linux/percpu-rwsem.h:55 include/linux/percpu-rwsem.h:77 kernel/cpu.c:491) [ 1.575968][ T1] ? static_key_slow_inc (kernel/jump_label.c:191) [ 1.575968][ T1] ? rq_qos_add (include/linux/blk-mq.h:940 block/blk-rq-qos.c:351) [ 1.575968][ T1] ? wbt_init (block/blk-wbt.c:925) [ 1.575968][ T1] ? wbt_enable_default (block/blk-wbt.c:728) [ 1.575968][ T1] ? blk_register_queue (block/blk-sysfs.c:910) [ 1.575968][ T1] ? __add_disk (block/genhd.c:528) [ 1.575968][ T1] ? add_disk_fwnode (block/genhd.c:597) [ 1.575968][ T1] ? device_add_disk (block/genhd.c:628) [ 1.575968][ T1] ? loop_add (drivers/block/loop.c:2078 (discriminator 3)) [ 1.575968][ T1] ? __lock_acquire (kernel/locking/lockdep.c:5237) [ 1.575968][ T1] ? loop_init (drivers/block/loop.c:2268 (discriminator 3)) [ 1.575968][ T1] ? max_loop_setup (drivers/block/loop.c:2228) [ 1.575968][ T1] ? do_one_initcall (init/main.c:1269) [ 1.575968][ T1] ? do_initcalls (init/main.c:1330 init/main.c:1347) [ 1.575968][ T1] ? kernel_init_freeable (init/main.c:1583) [ 1.575968][ T1] ? rest_init (init/main.c:1461) [ 1.575968][ T1] ? kernel_init (init/main.c:1471) [ 1.575968][ T1] ? ret_from_fork (arch/x86/kernel/process.c:154) [ 1.575968][ T1] ? rest_init (init/main.c:1461) [ 1.575968][ T1] ? ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 1.575968][ T1] ? entry_INT80_32 (arch/x86/entry/entry_32.S:945) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250814/202508140947.5235b2c7-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki