syzbot

INFO: task kworker/1:2:20508 blocked for more than 143 seconds.
      Not tainted 5.4.0-rc3+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:2     D23928 20508      2 0x80004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 schedule+0xca/0x250 kernel/sched/core.c:4136
 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4195
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x881/0x1360 kernel/locking/mutex.c:1103
 input_disconnect_device drivers/input/input.c:732 [inline]
 __input_unregister_device+0x23/0x430 drivers/input/input.c:2081
 input_unregister_device+0xb4/0xf0 drivers/input/input.c:2268
 iforce_usb_disconnect+0x5e/0xf0 drivers/input/joystick/iforce/iforce-usb.c:261
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1134 [inline]
 device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
 bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
 device_del+0x420/0xb20 drivers/base/core.c:2375
 usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
 usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2199
 hub_port_connect drivers/usb/core/hub.c:5034 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5323 [inline]
 port_event drivers/usb/core/hub.c:5469 [inline]
 hub_event+0x16ca/0x37e0 drivers/usb/core/hub.c:5551
 process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Showing all locks held in the system:
1 lock held by khungtaskd/23:
 #0: ffffffff86cfe4a0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335
1 lock held by rsyslogd/1603:
 #0: ffff8881d34965e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:801
2 locks held by getty/1695:
 #0: ffff8881d1aec090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc900004912e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1696:
 #0: ffff8881d1ae9090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc900004892e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1697:
 #0: ffff8881d1aa1090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc9000047d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1698:
 #0: ffff8881d1b71090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc900004952e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1699:
 #0: ffff8881d1ae8090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc900004852e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by getty/1700:
 #0: ffff8881d242c090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
6 locks held by kworker/1:2/20508:
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline]
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline]
 #0: ffff8881d8c6b928 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x1530 kernel/workqueue.c:2240
 #1: ffff8881ce4afdd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x1530 kernel/workqueue.c:2244
 #2: ffff8881d5180200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline]
 #2: ffff8881d5180200 (&dev->mutex){....}, at: hub_event+0x18a/0x37e0 drivers/usb/core/hub.c:5497
 #3: ffff8881c9e9e200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1462 [inline]
 #3: ffff8881c9e9e200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 drivers/usb/core/hub.c:2190
 #4: ffff8881d3404190 (&dev->mutex){....}, at: device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162
 #5: ffff8881c8f5f2a8 (&dev->mutex#2){+.+.}, at: input_disconnect_device drivers/input/input.c:732 [inline]
 #5: ffff8881c8f5f2a8 (&dev->mutex#2){+.+.}, at: __input_unregister_device+0x23/0x430 drivers/input/input.c:2081
2 locks held by getty/23726:
 #0: ffff8881cc27a090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: ffffc900003f12e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.2/23894:
 #0: ffff8881cdbc0148 (&evdev->mutex){+.+.}, at: evdev_close_device drivers/input/evdev.c:425 [inline]
 #0: ffff8881cdbc0148 (&evdev->mutex){+.+.}, at: evdev_release+0xeb/0x1c0 drivers/input/evdev.c:466
 #1: ffff8881c8f5f2a8 (&dev->mutex#2){+.+.}, at: input_close_device+0x42/0x1a0 drivers/input/input.c:673

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.4.0-rc3+ #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+0xca/0x13e lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 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+0x9a4/0xe50 kernel/hung_task.c:289
 kthread+0x318/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0x28/0x2e0 arch/x86/kernel/process.c:580