INFO: task kworker/0:2:95 blocked for more than 143 seconds.
      Not tainted 5.7.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:2     D23344    95      2 0x80004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:3367 [inline]
 __schedule+0x892/0x1d80 kernel/sched/core.c:4083
 __sched_text_start+0x8/0x8
 __preempt_count_sub arch/x86/include/asm/preempt.h:84 [inline]
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
 _raw_spin_unlock_irq+0x27/0x30 kernel/locking/spinlock.c:199
 schedule+0xcd/0x2b0 kernel/sched/core.c:4158
 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4217
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x87c/0x1360 kernel/locking/mutex.c:1103
 input_disconnect_device drivers/input/input.c:733 [inline]
 __input_unregister_device+0x23/0x430 drivers/input/input.c:2086
 mutex_trylock+0x2c0/0x2c0 kernel/locking/mutex.c:126
 mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:3628
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199
 __read_once_size include/linux/compiler.h:199 [inline]
 list_empty include/linux/list.h:282 [inline]
 usb_hcd_flush_endpoint+0x15c/0x410 drivers/usb/core/hcd.c:1787
 input_disconnect_device drivers/input/input.c:733 [inline]
 __input_unregister_device+0x23/0x430 drivers/input/input.c:2086
 input_disconnect_device drivers/input/input.c:733 [inline]
 __input_unregister_device+0x23/0x430 drivers/input/input.c:2086
 input_unregister_device+0xb4/0xf0 drivers/input/input.c:2273
 iforce_usb_disconnect+0x5e/0xf0 drivers/input/joystick/iforce/iforce-usb.c:261
 usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:436
 __pm_runtime_idle+0xd1/0x310 drivers/base/power/runtime.c:1021
 usb_autoresume_device+0x60/0x60 include/linux/pm_runtime.h:252
 __device_release_driver drivers/base/dd.c:1110 [inline]
 device_release_driver_internal+0x432/0x500 drivers/base/dd.c:1141
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
 device_del+0x481/0xd30 drivers/base/core.c:2715
 device_create_with_groups+0x120/0x120 drivers/base/core.c:3308
 usb_remove_ep_devs+0x3e/0x80 drivers/usb/core/endpoint.c:215
 remove_intf_ep_devs+0x13f/0x1d0 drivers/usb/core/message.c:1121
 usb_disable_device+0x23d/0x790 drivers/usb/core/message.c:1245
 usb_disconnect+0x293/0x900 drivers/usb/core/hub.c:2217
 hub_port_connect drivers/usb/core/hub.c:5059 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x1abf/0x43c0 drivers/usb/core/hub.c:5576
 hub_port_debounce+0x350/0x350 drivers/usb/core/hub.c:4441
 __x64_sys_sysinfo+0x30/0x40 kernel/sys.c:2604
 lock_is_held include/linux/lockdep.h:406 [inline]
 rcu_read_lock_sched_held+0x9c/0xd0 kernel/rcu/update.c:121
 rcu_read_lock_bh_held+0xb0/0xb0 kernel/rcu/update.c:333
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199
 process_one_work+0x965/0x1630 kernel/workqueue.c:2268
 lock_release+0x720/0x720 kernel/locking/lockdep.c:4689
 pwq_dec_nr_in_flight+0x310/0x310 kernel/workqueue.c:1198
 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1332
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 process_one_work+0x1630/0x1630 kernel/workqueue.c:1029
 kthread+0x326/0x430 kernel/kthread.c:268
 kthread_create_on_node+0xf0/0xf0 kernel/kthread.c:405
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351

Showing all locks held in the system:
5 locks held by kworker/1:1/21:
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x844/0x1630 kernel/workqueue.c:2239
 #1: ffff8881da317dc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x878/0x1630 kernel/workqueue.c:2243
 #2: ffff8881d4a58218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #2: ffff8881d4a58218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x43c0 drivers/usb/core/hub.c:5522
 #3: ffff8881d4a5b588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3012 [inline]
 #3: ffff8881d4a5b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5139 [inline]
 #3: ffff8881d4a5b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 #3: ffff8881d4a5b588 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5494 [inline]
 #3: ffff8881d4a5b588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x2050/0x43c0 drivers/usb/core/hub.c:5576
 #4: ffff8881d4f76468 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1b6/0x2e20 drivers/usb/core/hub.c:4563
1 lock held by khungtaskd/23:
 #0: ffffffff87111260 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5754
6 locks held by kworker/0:2/95:
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881d88af538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x844/0x1630 kernel/workqueue.c:2239
 #1: ffff8881d5a2fdc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x878/0x1630 kernel/workqueue.c:2243
 #2: ffff8881d4b50218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #2: ffff8881d4b50218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x43c0 drivers/usb/core/hub.c:5522
 #3: ffff8881c861f218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #3: ffff8881c861f218 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x91/0x900 drivers/usb/core/hub.c:2208
 #4: ffff8881cbeb31a8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1138
 #5: ffff8881c2e8c2c0 (&dev->mutex#2){+.+.}-{3:3}, at: input_disconnect_device drivers/input/input.c:733 [inline]
 #5: ffff8881c2e8c2c0 (&dev->mutex#2){+.+.}-{3:3}, at: __input_unregister_device+0x23/0x430 drivers/input/input.c:2086
2 locks held by in:imklog/257:
 #0: ffff8881c65d34f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
 #1: ffff8881db334958 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1262 [inline]
 #1: ffff8881db334958 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x21c/0x1d80 kernel/sched/core.c:4029
2 locks held by agetty/261:
 #0: ffff8881d1854098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267
 #1: ffffc90000a1a2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x220/0x1b30 drivers/tty/n_tty.c:2156
6 locks held by kworker/1:3/3060:
3 locks held by kworker/1:4/3074:
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x1630 kernel/workqueue.c:2239
 #1: ffff8881cd51fdc0 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x1630 kernel/workqueue.c:2243
 #2: ffff8881d4a58218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #2: ffff8881d4a58218 (&dev->mutex){....}-{3:3}, at: ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1077 [inline]
 #2: ffff8881d4a58218 (&dev->mutex){....}-{3:3}, at: ath9k_hif_usb_firmware_cb+0x388/0x510 drivers/net/wireless/ath/ath9k/hif_usb.c:1210
3 locks held by kworker/0:4/3083:
3 locks held by kworker/0:6/3146:
3 locks held by kworker/0:7/3168:
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x1630 kernel/workqueue.c:2239
 #1: ffff8881ab187dc0 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x1630 kernel/workqueue.c:2243
 #2: ffff8881d4a88218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
 #2: ffff8881d4a88218 (&dev->mutex){....}-{3:3}, at: ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1077 [inline]
 #2: ffff8881d4a88218 (&dev->mutex){....}-{3:3}, at: ath9k_hif_usb_firmware_cb+0x388/0x510 drivers/net/wireless/ath/ath9k/hif_usb.c:1210
2 locks held by kworker/1:5/3228:
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff8881da028d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x844/0x1630 kernel/workqueue.c:2239
 #1: ffff8881c776fdc0 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x878/0x1630 kernel/workqueue.c:2243
2 locks held by systemd-udevd/3854:
 #0: ffff8881c30a2160 (&evdev->mutex){+.+.}-{3:3}, at: evdev_close_device drivers/input/evdev.c:425 [inline]
 #0: ffff8881c30a2160 (&evdev->mutex){+.+.}-{3:3}, at: evdev_release+0xeb/0x1c0 drivers/input/evdev.c:466
 #1: ffff8881c2e8c2c0 (&dev->mutex#2){+.+.}-{3:3}, at: input_close_device+0x42/0x1a0 drivers/input/input.c:674
3 locks held by syz-executor.4/4653:
 #0: ffff8881d3d00438 (sb_writers#3){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1655 [inline]
 #0: ffff8881d3d00438 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x110 fs/namespace.c:412
 #1: ffff8881a88e5ba8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: inode_lock include/linux/fs.h:797 [inline]
 #1: ffff8881a88e5ba8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: ext4_ioctl+0x12d8/0x4520 fs/ext4/ioctl.c:846
 #2: ffff8881d3d02a30 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ind_migrate+0x23c/0x7e0 fs/ext4/migrate.c:621
3 locks held by syz-executor.4/4669:
 #0: ffff8881d045eaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
 #1: ffff8881d3d00438 (sb_writers#3){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2908 [inline]
 #1: ffff8881d3d00438 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x4cf/0x5d0 fs/read_write.c:558
 #2: ffff8881a88e5ba8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: inode_lock include/linux/fs.h:797 [inline]
 #2: ffff8881a88e5ba8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: ext4_dio_write_iter fs/ext4/file.c:482 [inline]
 #2: ffff8881a88e5ba8 (&sb->s_type->i_mutex_key#12){++++}-{3:3}, at: ext4_file_write_iter+0x4b7/0x1780 fs/ext4/file.c:640

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.7.0-rc6-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+0xef/0x16e lib/dump_stack.c:118
 irq_force_complete_move.cold+0x13/0x47 arch/x86/kernel/apic/vector.c:1023
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 lapic_can_unplug_cpu.cold+0x3b/0x3b
 nmi_trigger_cpumask_backtrace+0x1db/0x207 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+0xa99/0xfd0 kernel/hung_task.c:289
 reset_hung_task_detector+0x30/0x30 kernel/hung_task.c:243
 kthread+0x326/0x430 kernel/kthread.c:268
 kthread_create_on_node+0xf0/0xf0 kernel/kthread.c:405
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3228 Comm: kworker/1:5 Not tainted 5.7.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events request_firmware_work_func
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:write_comp_data+0x23/0x80 kernel/kcov.c:218
Code: 1f 84 00 00 00 00 00 65 4c 8b 04 25 40 0f 02 00 65 8b 05 88 cf c1 7e a9 00 01 1f 00 74 10 f6 c4 01 74 5c 41 8b 80 2c 13 00 00 <85> c0 74 51 41 8b 80 08 13 00 00 83 f8 03 75 45 49 8b 80 10 13 00
RSP: 0018:ffff8881db309ac8 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 000000000000000c RCX: ffffffff83b710d1
RDX: 0000000000000004 RSI: 0000000000000083 RDI: 0000000000000000
RBP: ffff8881d4a2c600 R08: ffff8881c72aca40 R09: ffffed103b661350
R10: 0000000000000003 R11: ffffed103b66134f R12: 0000000000000004
R13: ffff8881d4a2c000 R14: dffffc0000000000 R15: 0000000000000083
FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9bbab60028 CR3: 00000001ac95a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 find_endpoint drivers/usb/gadget/udc/dummy_hcd.c:1566 [inline]
 find_endpoint+0x1f1/0x270 drivers/usb/gadget/udc/dummy_hcd.c:1550
 dummy_timer+0x459/0x32b4 drivers/usb/gadget/udc/dummy_hcd.c:1836
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
 hlock_class kernel/locking/lockdep.c:179 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3146 [inline]
 validate_chain kernel/locking/lockdep.c:3202 [inline]
 __lock_acquire+0x2248/0x6650 kernel/locking/lockdep.c:4355
 dummy_udc_probe+0x980/0x980 include/linux/device.h:699
 lock_is_held include/linux/lockdep.h:406 [inline]
 rcu_read_lock_sched_held+0x9c/0xd0 kernel/rcu/update.c:121
 rcu_read_lock_bh_held+0xb0/0xb0 kernel/rcu/update.c:333
 call_timer_fn+0x1ac/0x700 kernel/time/timer.c:1405
 dummy_udc_probe+0x980/0x980 include/linux/device.h:699
 timer_fixup_init+0x60/0x60 kernel/time/timer.c:632
 lock_downgrade+0x720/0x720 kernel/locking/lockdep.c:4599
 mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:3628
 rcu_read_lock_bh_held+0xb0/0xb0 kernel/rcu/update.c:333
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199
 dummy_udc_probe+0x980/0x980 include/linux/device.h:699
 expire_timers kernel/time/timer.c:1450 [inline]
 __run_timers kernel/time/timer.c:1774 [inline]
 __run_timers kernel/time/timer.c:1741 [inline]
 run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1787
 add_timer+0x7a0/0x7a0 kernel/time/timer.c:893
 lock_is_held include/linux/lockdep.h:406 [inline]
 rcu_read_lock_sched_held+0x9c/0xd0 kernel/rcu/update.c:121
 rcu_read_lock_bh_held+0xb0/0xb0 kernel/rcu/update.c:333
 mark_held_locks+0x9f/0xe0 kernel/locking/lockdep.c:3628
 __do_softirq+0x21e/0x9aa kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1140
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline]
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1779 [inline]
RIP: 0010:vprintk_emit+0x3d0/0x3e0 kernel/printk/printk.c:2020
Code: 00 83 fb ff 75 d6 e9 d8 fc ff ff e8 7a 2f 16 00 e8 55 8c 1b 00 41 56 9d e9 aa fd ff ff e8 68 2f 16 00 e8 43 8c 1b 00 41 56 9d <e9> 2a ff ff ff 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 f5 53 48
RSP: 0018:ffff8881c776fab8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000200 RCX: 1ffffffff1270ab2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881c72ad2bc
RBP: ffff8881c776fb00 R08: 0000000000000001 R09: fffffbfff126c8c8
R10: ffffffff8936463f R11: fffffbfff126c8c7 R12: 000000000000002a
R13: ffff8881d8c98000 R14: 0000000000000293 R15: 0000000000000000
 vprintk_func+0x75/0x113 kernel/printk/printk_safe.c:385
 printk+0xba/0xed kernel/printk/printk.c:2081
 kmsg_dump_rewind_nolock+0xd9/0xd9 kernel/printk/printk.c:3374
 refcount_sub_and_test include/linux/refcount.h:273 [inline]
 refcount_dec_and_test include/linux/refcount.h:294 [inline]
 kref_put include/linux/kref.h:64 [inline]
 usb_free_urb.part.0+0x52/0x110 drivers/usb/core/urb.c:96
 ath9k_htc_hw_init.cold+0x5/0x2a drivers/net/wireless/ath/ath9k/htc_hst.c:502
 ath9k_htc_hw_init+0x3d/0x60 drivers/net/wireless/ath/ath9k/htc_hst.c:501
 ath9k_htc_hw_init.cold+0x17/0x2a drivers/net/wireless/ath/ath9k/htc_hst.c:502
 ath9k_hif_usb_firmware_cb+0x274/0x510 drivers/net/wireless/ath/ath9k/hif_usb.c:1187
 ath9k_hif_usb_resume+0x320/0x320 drivers/net/wireless/ath/ath9k/hif_usb.c:1400
 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:1005
 request_firmware_into_buf+0x90/0x90 drivers/base/firmware_loader/main.c:968
 lock_is_held include/linux/lockdep.h:406 [inline]
 rcu_read_lock_sched_held+0x9c/0xd0 kernel/rcu/update.c:121
 rcu_read_lock_bh_held+0xb0/0xb0 kernel/rcu/update.c:333
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x30 kernel/locking/spinlock.c:199
 process_one_work+0x965/0x1630 kernel/workqueue.c:2268
 lock_release+0x720/0x720 kernel/locking/lockdep.c:4689
 pwq_dec_nr_in_flight+0x310/0x310 kernel/workqueue.c:1198
 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1332
 to_kthread kernel/kthread.c:75 [inline]
 kthread_data+0x46/0xc0 kernel/kthread.c:165
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 process_one_work+0x1630/0x1630 kernel/workqueue.c:1029
 kthread+0x326/0x430 kernel/kthread.c:268
 kthread_create_on_node+0xf0/0xf0 kernel/kthread.c:405
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351