INFO: task kworker/1:7:14545 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:7     state:D stack:22008 pid:14545 tgid:14545 ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events request_firmware_work_func

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x145d/0x4a00 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0xc69/0x1ca0 kernel/locking/mutex.c:776
 device_lock include/linux/device.h:895 [inline]
 ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1161 [inline]
 ath9k_hif_usb_firmware_cb+0x3b1/0x620 drivers/net/wireless/ath/ath9k/hif_usb.c:1294
 request_firmware_work_func+0x13c/0x250 drivers/base/firmware_loader/main.c:1152
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff892cd760
 (rcu_read_lock
){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/2921:
 #0: ffff8881128390a0 (&tty->ldisc_sem
){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900000452f0 (
&ldata->atomic_read_lock){+.+.}-{4:4}
, at: n_tty_read+0x41b/0x1510 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:4/5244:
3 locks held by kworker/1:7/14545:
 #0: ffff888100071948 ((wq_completion)events){+.+.}-{0:0}
, at: process_one_work+0x128d/0x1b20 kernel/workqueue.c:3232
 #1: ffffc900143ffca0 ((work_completion)(&fw_work->work)){+.+.}-{0:0}, at: process_one_work+0x914/0x1b20 kernel/workqueue.c:3233
 #2: ffff888109fce198 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:895 [inline]
, at: ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1161 [inline]
, at: ath9k_hif_usb_firmware_cb+0x3b1/0x620 drivers/net/wireless/ath/ath9k/hif_usb.c:1294
4 locks held by kworker/0:7/20473:
4 locks held by udevd/26767:
 #0: ffff88813ab39790 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12d0 fs/seq_file.c:182
 #1: ffff888119cd9c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_seq_start+0x4f/0x2a0 fs/kernfs/file.c:172
 #2: ffff888139bcb008 (kn->active#9){++++}-{0:0}
, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
, at: kernfs_seq_start+0xbc/0x2a0 fs/kernfs/file.c:173
 #3: ffff88813488f198
 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:900 [inline]
 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
4 locks held by udevd/26768:
 #0: ffff888118b21e80 (&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12d0 fs/seq_file.c:182
 #1: ffff8881127b4488 (&of->mutex){+.+.}-{4:4}
, at: kernfs_seq_start+0x4f/0x2a0 fs/kernfs/file.c:172
 #2: ffff88811a8150f8
 (kn->active#9){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
 (kn->active#9){++++}-{0:0}, at: kernfs_seq_start+0xbc/0x2a0 fs/kernfs/file.c:173
 #3: ffff88811ed72198 (&dev->mutex
){....}-{4:4}
, at: device_lock_interruptible include/linux/device.h:900 [inline]
, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
5 locks held by kworker/1:9/29461:
3 locks held by syz.2.6115/31896:
 #0: ffff888110306118 (
&evdev->mutex){+.+.}-{4:4}, at: evdev_close_device drivers/input/evdev.c:402 [inline]
&evdev->mutex){+.+.}-{4:4}, at: evdev_release+0x29e/0x420 drivers/input/evdev.c:447
 #1: ffff8881103042c0 (&dev->mutex#2){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
 #1: ffff8881103042c0 (&dev->mutex#2){+.+.}-{4:4}, at: input_close_device+0x46/0x2a0 drivers/input/input.c:646
 #2: ffffffff892d8eb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:311

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x133/0x180 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
 watchdog+0xe66/0x1180 kernel/hung_task.c:515
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30070 Comm: kworker/0:9 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events legacy_dvb_usb_read_remote_control
RIP: 0010:lookup_object lib/debugobjects.c:423 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:662 [inline]
RIP: 0010:debug_object_activate+0x1bc/0x4c0 lib/debugobjects.c:820
Code: 80 3c 30 00 0f 85 56 02 00 00 48 8b 1b 48 85 db 0f 84 4b 01 00 00 48 8d 7b 18 41 83 c4 01 48 89 f8 48 c1 e8 03 42 80 3c 30 00 <0f> 85 0a 02 00 00 4c 3b 6b 18 75 c2 48 85 db 0f 84 e4 01 00 00 48
RSP: 0018:ffffc90000007ab0 EFLAGS: 00000046
RAX: 1ffff11025fdfe03 RBX: ffff88812feff000 RCX: ffffffff815c07ec
RDX: ffffffff8767d0a0 RSI: 0000000000000004 RDI: ffff88812feff018
RBP: ffffc90000007b98 R08: 0000000000000001 R09: fffff52000000f44
R10: 0000000000000002 R11: ffffffff93c7aef0 R12: 0000000000000002
R13: ffff88812d463710 R14: dffffc0000000000 R15: 1ffff92000000f5a
FS:  0000000000000000(0000) GS:ffff888268bf4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f954ed45d58 CR3: 000000014671e000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 debug_work_activate kernel/workqueue.c:664 [inline]
 insert_work+0x2e/0x230 kernel/workqueue.c:2177
 __queue_work+0x94f/0x10e0 kernel/workqueue.c:2335
 call_timer_fn+0x19a/0x5a0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1794 [inline]
 __run_timers+0x569/0xae0 kernel/time/timer.c:2373
 __run_timer_base kernel/time/timer.c:2385 [inline]
 __run_timer_base kernel/time/timer.c:2377 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2394
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2404
 handle_softirqs+0x208/0x940 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2037 [inline]
RIP: 0010:vprintk_emit+0x556/0x6b0 kernel/printk/printk.c:2425
Code: 00 4d 85 ed 0f 85 19 01 00 00 e8 25 1e 21 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 e3 18 21 00 48 85 ed 0f 85 25 01 00 00 <e8> 05 1e 21 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00
RSP: 0018:ffffc90009af7978 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000017 RCX: ffffffff815ed27b
RDX: ffff88811cfcba80 RSI: ffffffff815ed285 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88811cfcc528 R12: 1ffff9200135ef31
R13: 0000000000000200 R14: ffff8881022e57c0 R15: ffffc90009af7a40
 _printk+0xc7/0x100 kernel/printk/printk.c:2451
 m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline]
 m920x_rc_query+0x496/0x770 drivers/media/usb/dvb-usb/m920x.c:193
 legacy_dvb_usb_read_remote_control+0x10c/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x74f/0xa30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>