INFO: task kworker/0:6:18435 blocked for more than 143 seconds. Not tainted 5.1.0-rc5-319617-gd34f951 #5 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:6 D24376 18435 2 0x80000000 Workqueue: pm hcd_resume_work Call Trace: schedule+0x8f/0x180 kernel/sched/core.c:3562 schedule_preempt_disabled+0x11/0x20 kernel/sched/core.c:3620 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x800/0x12b0 kernel/locking/mutex.c:1072 device_lock include/linux/device.h:1207 [inline] usb_remote_wakeup+0x24/0xf0 drivers/usb/core/hub.c:3597 process_one_work+0x90f/0x1580 kernel/workqueue.c:2269 worker_thread+0x9b/0xe20 kernel/workqueue.c:2415 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 00000000e3afc3c0 ((wq_completion)events_unbound){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 000000001ff91717 (connector_reaper_work){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 6 locks held by kworker/0:1/12: #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 00000000f7181404 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 #2: 00000000a4a6b3c2 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #2: 00000000a4a6b3c2 (&dev->mutex){....}, at: hub_event+0x18a/0x3b00 drivers/usb/core/hub.c:5378 #3: 00000000e1cad510 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #3: 00000000e1cad510 (&dev->mutex){....}, at: usb_disconnect+0x96/0x870 drivers/usb/core/hub.c:2188 #4: 000000009893653b (&dev->mutex){....}, at: device_release_driver_internal+0x28/0x4f0 drivers/base/dd.c:1110 #5: 00000000ed3eaaee (input_mutex){+.+.}, at: __input_unregister_device+0x165/0x490 drivers/input/input.c:2021 1 lock held by khungtaskd/23: #0: 00000000fcedfbcd (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5054 3 locks held by kworker/1:3/581: 1 lock held by rsyslogd/5139: 2 locks held by getty/5229: #0: 0000000041c1e7de (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000bb977b44 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 2 locks held by getty/5230: #0: 00000000b0c1387e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000b9dc5d51 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 2 locks held by getty/5231: #0: 00000000c2126981 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000533be45e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 2 locks held by getty/5232: #0: 000000000b21a842 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000bcaa2fd1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 2 locks held by getty/5233: #0: 00000000662bed09 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000003bd25ac6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 2 locks held by getty/5234: #0: 00000000b70bbb55 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000ee7b076a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 2 locks held by getty/5235: #0: 00000000cf75baf3 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x27/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000081f7a6d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x21c/0x1a60 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:4/5403: #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 00000000dd89821a ((work_completion)(&hcd->wakeup_work)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 #2: 00000000fcd59357 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #2: 00000000fcd59357 (&dev->mutex){....}, at: usb_remote_wakeup+0x24/0xf0 drivers/usb/core/hub.c:3597 9 locks held by kworker/0:5/5427: #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 00000000d89c0d5d ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 000000003005233d ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 #2: 0000000072b160ee (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #2: 0000000072b160ee (&dev->mutex){....}, at: hub_event+0x18a/0x3b00 drivers/usb/core/hub.c:5378 #3: 00000000ac5ba69d (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #3: 00000000ac5ba69d (&dev->mutex){....}, at: __device_attach+0x80/0x3a0 drivers/base/dd.c:821 #4: 0000000005061a18 (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #4: 0000000005061a18 (&dev->mutex){....}, at: __device_attach+0x80/0x3a0 drivers/base/dd.c:821 #5: 00000000a0244a89 (&dev->phy_mutex){+.+.}, at: asix_mdio_read+0x9d/0x2d0 drivers/net/usb/asix_common.c:465 #6: 00000000bed2ba2f (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:10053 [inline] #6: 00000000bed2ba2f (&rq->lock){-.-.}, at: pick_next_task_fair+0x9c0/0x1af0 kernel/sched/fair.c:7062 #7: 00000000bed2ba2f (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1168 [inline] #7: 00000000bed2ba2f (&rq->lock){-.-.}, at: ttwu_queue kernel/sched/core.c:1888 [inline] #7: 00000000bed2ba2f (&rq->lock){-.-.}, at: try_to_wake_up+0x5d7/0xf90 kernel/sched/core.c:2100 #8: 00000000b254c57e (&port_lock_key){-.-.}, at: serial8250_console_write+0x1aa/0x880 drivers/tty/serial/8250/8250_port.c:3245 3 locks held by kworker/1:0/9833: 6 locks held by kworker/1:6/17711: 3 locks held by kworker/0:6/18435: #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: set_work_data kernel/workqueue.c:619 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline] #0: 00000000ddbe8887 ((wq_completion)pm){+.+.}, at: process_one_work+0x81f/0x1580 kernel/workqueue.c:2240 #1: 0000000058bf700f ((work_completion)(&hcd->wakeup_work)){+.+.}, at: process_one_work+0x853/0x1580 kernel/workqueue.c:2244 #2: 0000000072b160ee (&dev->mutex){....}, at: device_lock include/linux/device.h:1207 [inline] #2: 0000000072b160ee (&dev->mutex){....}, at: usb_remote_wakeup+0x24/0xf0 drivers/usb/core/hub.c:3597 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.1.0-rc5-319617-gd34f951 #5 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+0xe8/0x16e lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x48/0x87 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1bd lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0x98e/0xe20 kernel/hung_task.c:288 kthread+0x313/0x420 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: