INFO: task kworker/0:4:9835 blocked for more than 143 seconds. Not tainted 5.10.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:4 state:D stack:25832 pid: 9835 ppid: 2 flags:0x00004000 Workqueue: pm hcd_resume_work Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x92c/0xcb0 kernel/sched/core.c:4523 schedule+0x14b/0x200 kernel/sched/core.c:4601 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660 __mutex_lock_common+0x122f/0x2f20 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118 device_lock include/linux/device.h:731 [inline] usb_remote_wakeup+0x1f/0xf0 drivers/usb/core/hub.c:3642 process_one_work+0x789/0xfc0 kernel/workqueue.c:2272 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2418 kthread+0x36b/0x390 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Showing all locks held in the system: 5 locks held by kworker/1:0/17: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90000d77d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff8881449d0218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff8881449d0218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 #3: ffff8881449d4588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3029 [inline] #3: ffff8881449d4588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xb35/0x2540 drivers/usb/core/hub.c:5153 #4: ffff888017485768 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ee/0x2ca0 drivers/usb/core/hub.c:4581 2 locks held by kworker/u4:4/173: 1 lock held by khungtaskd/1643: #0: ffffffff8bae6840 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 5 locks held by kworker/0:2/2986: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc900017cfd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff88801c8dc218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff88801c8dc218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 #3: ffff88801c920588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3029 [inline] #3: ffff88801c920588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xb35/0x2540 drivers/usb/core/hub.c:5153 #4: ffff88801c69db68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ee/0x2ca0 drivers/usb/core/hub.c:4581 1 lock held by in:imklog/8152: #0: ffff8880172365f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24b/0x2e0 fs/file.c:932 5 locks held by kworker/1:5/9783: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90015f37d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff888144977218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff888144977218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 #3: ffff88801c884588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3029 [inline] #3: ffff88801c884588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xb35/0x2540 drivers/usb/core/hub.c:5153 #4: ffff88801c758d68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ee/0x2ca0 drivers/usb/core/hub.c:4581 3 locks held by kworker/0:4/9835: #0: ffff8880111eb138 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc900160d7d80 ((work_completion)(&hcd->wakeup_work)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff8881449ba218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff8881449ba218 (&dev->mutex){....}-{3:3}, at: usb_remote_wakeup+0x1f/0xf0 drivers/usb/core/hub.c:3642 5 locks held by kworker/1:1/9744: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90016ea7d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff88814498e218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff88814498e218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 #3: ffff88801c8d2588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3029 [inline] #3: ffff88801c8d2588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xb35/0x2540 drivers/usb/core/hub.c:5153 #4: ffff88801c758d68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ee/0x2ca0 drivers/usb/core/hub.c:4581 5 locks held by kworker/1:2/10104: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90017adfd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff8881449ba218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff8881449ba218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 #3: ffff8881449be588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3029 [inline] #3: ffff8881449be588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xb35/0x2540 drivers/usb/core/hub.c:5153 #4: ffff88801c69db68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ee/0x2ca0 drivers/usb/core/hub.c:4581 5 locks held by kworker/1:6/14177: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc9001782fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff88801c9fc218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff88801c9fc218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 #3: ffff88801ca38588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3029 [inline] #3: ffff88801ca38588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect+0xb35/0x2540 drivers/usb/core/hub.c:5153 #4: ffff888015023368 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1ee/0x2ca0 drivers/usb/core/hub.c:4581 3 locks held by kworker/1:7/15115: #0: ffff888015431938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2245 #1: ffffc90016167d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2247 #2: ffff888144a5c218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:731 [inline] #2: ffff888144a5c218 (&dev->mutex){....}-{3:3}, at: hub_event+0x112/0xcb0 drivers/usb/core/hub.c:5536 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1643 Comm: khungtaskd Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:118 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xcb0/0xcf0 kernel/hung_task.c:294 kthread+0x36b/0x390 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.10.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_preemption_disabled+0x9/0x170 lib/smp_processor_id.c:13 Code: cc 0f 1f 44 00 00 48 c7 c7 e0 8a ec 89 48 c7 c6 20 8b ec 89 eb 0b 90 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 41 54 <53> 48 83 ec 10 49 89 f6 49 89 ff 65 48 8b 04 25 28 00 00 00 48 89 RSP: 0018:ffffc90000d67a30 EFLAGS: 00000086 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000102 RDX: 0000000000000000 RSI: ffffffff89ec8b20 RDI: ffffffff89ec8ae0 RBP: ffffffff83c54f62 R08: dffffc0000000000 R09: fffffbfff19dc55e R10: fffffbfff19dc55e R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000004 R14: 0000000000000286 R15: ffffffff8f4e1390 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a441e803b8 CR3: 0000000014741000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lockdep_current_cpu_online+0x34/0x100 kernel/rcu/tree.c:1150 rcu_read_lock_held_common kernel/rcu/update.c:110 [inline] rcu_read_lock_sched_held+0x2c/0xb0 kernel/rcu/update.c:121 trace_lock_release+0x61/0x140 include/trace/events/lock.h:58 lock_release+0x27/0x6b0 kernel/locking/lockdep.c:5447 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline] _raw_spin_unlock_irqrestore+0x18/0x60 kernel/locking/spinlock.c:191 __debug_check_no_obj_freed lib/debugobjects.c:997 [inline] debug_check_no_obj_freed+0x5a2/0x650 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1536 [inline] slab_free_freelist_hook+0xc6/0x1a0 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x85/0x160 mm/slub.c:3158 rcu_do_batch kernel/rcu/tree.c:2476 [inline] rcu_core+0x79b/0x10b0 kernel/rcu/tree.c:2711 __do_softirq+0x307/0x6be kernel/softirq.c:298 run_ksoftirqd+0x63/0xa0 kernel/softirq.c:653 smpboot_thread_fn+0x572/0x970 kernel/smpboot.c:165 kthread+0x36b/0x390 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296