INFO: task kworker/0:3:2740 blocked for more than 143 seconds. Not tainted 5.2.0-rc5+ #11 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D24136 2740 2 0x80004000 Workqueue: events request_firmware_work_func Call Trace: schedule+0x96/0x240 kernel/sched/core.c:3509 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:3568 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0x7fb/0x12b0 kernel/locking/mutex.c:1073 device_lock include/linux/device.h:1208 [inline] p54u_load_firmware_cb.cold+0xfb/0x13d drivers/net/wireless/intersil/p54/p54usb.c:941 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:785 process_one_work+0x905/0x1570 kernel/workqueue.c:2269 worker_thread+0x96/0xe20 kernel/workqueue.c:2415 kthread+0x30b/0x410 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Showing all locks held in the system: 6 locks held by kworker/0:0/5: 5 locks held by kworker/1:0/17: #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:221 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x81a/0x1570 kernel/workqueue.c:2240 #1: 000000000a994ff9 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x84e/0x1570 kernel/workqueue.c:2244 #2: 000000002542b797 (&dev->mutex){....}, at: device_lock include/linux/device.h:1208 [inline] #2: 000000002542b797 (&dev->mutex){....}, at: hub_event+0x179/0x3590 drivers/usb/core/hub.c:5378 #3: 000000007ba25c7e (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2994 [inline] #3: 000000007ba25c7e (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5020 [inline] #3: 000000007ba25c7e (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5204 [inline] #3: 000000007ba25c7e (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5350 [inline] #3: 000000007ba25c7e (&port_dev->status_lock){+.+.}, at: hub_event+0x18e8/0x3590 drivers/usb/core/hub.c:5432 #4: 000000007db8fb9f (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b6/0x2c00 drivers/usb/core/hub.c:4529 1 lock held by khungtaskd/23: #0: 000000001604696e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5147 1 lock held by rsyslogd/1612: #0: 0000000047b279a7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801 2 locks held by getty/1703: #0: 0000000052bcfd6d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000003f24923c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 2 locks held by getty/1704: #0: 000000002d9593ba (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000046e5b72a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 2 locks held by getty/1705: #0: 00000000d9bb5f5a (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000f9aca697 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 2 locks held by getty/1706: #0: 0000000051a94d90 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000029832d50 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 2 locks held by getty/1707: #0: 00000000e2434c5f (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000002fe0021b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 2 locks held by getty/1708: #0: 000000005c5577d8 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000e39272b4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 2 locks held by getty/1709: #0: 0000000063583074 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000001936da0b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:3/2740: #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:221 [inline] #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 00000000be3baf3e ((wq_completion)events){+.+.}, at: process_one_work+0x81a/0x1570 kernel/workqueue.c:2240 #1: 00000000ecc5fa0c ((work_completion)(&fw_work->work)){+.+.}, at: process_one_work+0x84e/0x1570 kernel/workqueue.c:2244 #2: 000000003ecf2fc1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1208 [inline] #2: 000000003ecf2fc1 (&dev->mutex){....}, at: p54u_load_firmware_cb.cold+0xfb/0x13d drivers/net/wireless/intersil/p54/p54usb.c:941 6 locks held by kworker/0:1/6490: 6 locks held by kworker/0:6/11555: #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:221 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 00000000eb84b567 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x81a/0x1570 kernel/workqueue.c:2240 #1: 0000000016d11059 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x84e/0x1570 kernel/workqueue.c:2244 #2: 000000003ecf2fc1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1208 [inline] #2: 000000003ecf2fc1 (&dev->mutex){....}, at: hub_event+0x179/0x3590 drivers/usb/core/hub.c:5378 #3: 0000000053a0db14 (&dev->mutex){....}, at: device_lock include/linux/device.h:1208 [inline] #3: 0000000053a0db14 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:820 #4: 000000005a50179e (&dev->mutex){....}, at: device_lock include/linux/device.h:1208 [inline] #4: 000000005a50179e (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:820 #5: 0000000011a3cf4a (&dev->phy_mutex){+.+.}, at: asix_mdio_read+0x93/0x250 drivers/net/usb/asix_common.c:453 5 locks held by kworker/1:3/17165: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.2.0-rc5+ #11 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+0xca/0x13e 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:205 [inline] watchdog+0x989/0xe20 kernel/hung_task.c:289 kthread+0x30b/0x410 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0x28/0x2b0 arch/x86/kernel/process.c:580