INFO: task kworker/0:6:8326 blocked for more than 143 seconds. Not tainted 5.9.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:6 state:D stack:23568 pid: 8326 ppid: 2 flags:0x00004000 Workqueue: pm hcd_resume_work Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4661 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10e0 kernel/locking/mutex.c:1103 device_lock include/linux/device.h:785 [inline] usb_remote_wakeup+0x1f/0xb0 drivers/usb/core/hub.c:3625 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 5 locks held by kworker/1:0/17: #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc90000d8fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffff888217afe218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #2: ffff888217afe218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b6/0x3e60 drivers/usb/core/hub.c:5522 #3: ffff888217b0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3012 [inline] #3: ffff888217b0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5139 [inline] #3: ffff888217b0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] #3: ffff888217b0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5494 [inline] #3: ffff888217b0b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x1e4f/0x3e60 drivers/usb/core/hub.c:5576 #4: ffff888217af7468 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1b6/0x2d80 drivers/usb/core/hub.c:4563 1 lock held by khungtaskd/1172: #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5852 5 locks held by kworker/0:2/2471: #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880a62e0538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc900085efda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffff888217ab7218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #2: ffff888217ab7218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b6/0x3e60 drivers/usb/core/hub.c:5522 #3: ffff88809daf8588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3012 [inline] #3: ffff88809daf8588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5139 [inline] #3: ffff88809daf8588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] #3: ffff88809daf8588 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5494 [inline] #3: ffff88809daf8588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x1e4f/0x3e60 drivers/usb/core/hub.c:5576 #4: ffff88809daebd68 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1b6/0x2d80 drivers/usb/core/hub.c:4563 2 locks held by kworker/1:2/2591: #0: ffff8880aa073538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa073538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8880aa073538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8880aa073538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8880aa073538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8880aa073538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc9000891fda8 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 1 lock held by in:imklog/6572: #0: ffff888097545b70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 2 locks held by agetty/6810: #0: ffff8880a9005098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc9000121c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:6/8326: #0: ffff88821b036938 ((wq_completion)pm){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88821b036938 ((wq_completion)pm){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88821b036938 ((wq_completion)pm){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88821b036938 ((wq_completion)pm){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff88821b036938 ((wq_completion)pm){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88821b036938 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc9001614fda8 ((work_completion)(&hcd->wakeup_work)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffff888217afe218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #2: ffff888217afe218 (&dev->mutex){....}-{3:3}, at: usb_remote_wakeup+0x1f/0xb0 drivers/usb/core/hub.c:3625 3 locks held by kworker/u4:1/26152: 2 locks held by syz-executor.2/30408: #0: ffff88803f9c3750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:779 [inline] #0: ffff88803f9c3750 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:595 #1: ffffffff8a0710a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #1: ffffffff8a0710a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f2/0x610 kernel/rcu/tree_exp.h:838 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc7-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+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 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+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 5.9.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_is_held kernel/locking/lockdep.c:4792 [inline] RIP: 0010:lock_is_held_type+0x65/0xf0 kernel/locking/lockdep.c:5068 Code: 85 e4 08 00 00 01 49 89 c7 8b 85 e0 08 00 00 85 c0 7f 0d eb 7d 83 c3 01 3b 9d e0 08 00 00 7d 72 48 63 c3 4c 89 e6 48 8d 04 80 <4d> 8d 74 c5 00 4c 89 f7 e8 4e fc ff ff 85 c0 74 da 8b 4c 24 04 41 RSP: 0018:ffffc90000d0faa0 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffff8880ae435e18 RDI: ffff8880ae435e18 RBP: ffff8880a9610280 R08: 0000000000000000 R09: ffffffff8a0454b7 R10: fffffbfff1408a96 R11: 0000000000000000 R12: ffff8880ae435e18 R13: ffff8880a9610b68 R14: ffff8880a9610458 R15: 0000000000000086 FS: 0000000000000000(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc21f66b018 CR3: 000000009f597000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:267 [inline] rq_clock_task kernel/sched/sched.h:1153 [inline] update_curr+0x28d/0x8a0 kernel/sched/fair.c:845 dequeue_entity+0x22/0xaf0 kernel/sched/fair.c:4301 dequeue_task_fair+0x12e/0xe60 kernel/sched/fair.c:5589 dequeue_task kernel/sched/core.c:1590 [inline] deactivate_task kernel/sched/core.c:1604 [inline] __schedule+0x97f/0x2280 kernel/sched/core.c:4485 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879 rcu_gp_fqs_loop kernel/rcu/tree.c:1890 [inline] rcu_gp_kthread+0xb2c/0x1ca0 kernel/rcu/tree.c:2060 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294