INFO: task kworker/1:1:37 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1 state:D
stack:20168 pid:37 tgid:37 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xeb0/0x3e50 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7021
rwsem_down_write_slowpath+0x530/0x1280 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1c7/0x1f0 kernel/locking/rwsem.c:1591
kernfs_add_one+0x38/0x850 fs/kernfs/dir.c:796
kernfs_create_dir_ns+0xfc/0x1a0 fs/kernfs/dir.c:1098
sysfs_create_dir_ns+0x13a/0x2b0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x2c8/0x930 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_add+0x16a/0x1e0 lib/kobject.c:426
device_add+0x294/0x1950 drivers/base/core.c:3627
device_create_groups_vargs+0x1f8/0x270 drivers/base/core.c:4371
device_create_with_groups+0xf4/0x130 drivers/base/core.c:4451
led_classdev_register_ext+0x4d2/0x990 drivers/leds/led-class.c:537
led_classdev_register include/linux/leds.h:274 [inline]
input_leds_connect+0x5af/0x8b0 drivers/input/input-leds.c:145
input_attach_handler.isra.0+0x177/0x1e0 drivers/input/input.c:994
input_register_device.cold+0x139/0x375 drivers/input/input.c:2378
hidinput_connect+0x1a48/0xb650 drivers/hid/hid-input.c:2371
hid_connect+0x1332/0x1760 drivers/hid/hid-core.c:2261
hid_hw_start+0xaa/0x140 drivers/hid/hid-core.c:2379
ms_probe+0x157/0x4c0 drivers/hid/hid-microsoft.c:391
__hid_device_probe drivers/hid/hid-core.c:2775 [inline]
hid_device_probe+0x50e/0x800 drivers/hid/hid-core.c:2812
call_driver_probe drivers/base/dd.c:581 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:659
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
__device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
hid_add_device+0x2bf/0x440 drivers/hid/hid-core.c:2951
usbhid_probe+0xd57/0x1350 drivers/hid/usbhid/hid-core.c:1450
usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:581 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:659
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
__device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:581 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:659
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:801
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:831
__device_attach_driver+0x1df/0x340 drivers/base/dd.c:959
bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
__device_attach+0x1e4/0x4d0 drivers/base/dd.c:1031
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1086
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
INFO: task syz.2.953:8874 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.953 state:D
stack:28744 pid:8874 tgid:8873 ppid:2971 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0xeb0/0x3e50 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0xdd/0x390 kernel/sched/core.c:6964
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7021
rwsem_down_write_slowpath+0x530/0x1280 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1c7/0x1f0 kernel/locking/rwsem.c:1591
kernfs_remove_by_name_ns+0x3d/0xf0 fs/kernfs/dir.c:1717
sysfs_remove_file include/linux/sysfs.h:780 [inline]
driver_remove_file drivers/base/driver.c:201 [inline]
driver_remove_file+0x4a/0x60 drivers/base/driver.c:197
remove_bind_files drivers/base/bus.c:642 [inline]
bus_remove_driver+0x248/0x2e0 drivers/base/bus.c:780
driver_unregister+0x76/0xb0 drivers/base/driver.c:277
usb_gadget_register_driver_owner.cold+0x6c/0xd0 drivers/usb/gadget/udc/core.c:1741
raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0x570 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f85f810bc0b
RSP: 002b:00007f85f6b64f00 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f85f810bc0b
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000005
RBP: 00007f85f6b65fd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000200000000340 R14: 0000000000000003 R15: 00000000000010d0
Showing all locks held in the system:
6 locks held by kworker/0:1/10:
1 lock held by khungtaskd/30:
#0: ffffffff894da3a0
(rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
7 locks held by kworker/1:1/37:
2 locks held by kworker/u8:2/38:
#0:
ffff888100089148
((wq_completion)events_unbound
#2){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90000287ca8
((work_completion)(&sub_info->work)
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
7 locks held by kworker/0:2/2810:
#0:
ffff888100ed2148
((wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc900046dfca8
((work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2:
ffff88810a760198
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:895 [inline]
, at: hub_event+0x1bd/0x4af0 drivers/usb/core/hub.c:5899
#3: ffff88811ed5a198
(&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:895 [inline]
, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1006
#4: ffff8881336ab160
(&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:895 [inline]
, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1006
#5:
ffff88813b111a20
(
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:895 [inline]
, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1006
#6: ffffffff8a2e1068
(input_mutex
){+.+.}-{4:4}
, at: class_mutex_intr_constructor include/linux/mutex.h:255 [inline]
, at: input_register_device.cold+0x5b/0x375 drivers/input/input.c:2374
1 lock held by udevd/2862:
2 locks held by getty/2924:
#0: ffff888106fdd0a0
(&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+0x419/0x1500 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/2969:
1 lock held by syz-executor/2970:
1 lock held by syz-executor/2971:
1 lock held by syz-executor/2975:
1 lock held by syz-executor/2977:
5 locks held by kworker/0:3/5221:
4 locks held by kworker/0:4/5226:
4 locks held by udevd/5236:
#0:
ffff888135a9d790
(&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x1270 fs/seq_file.c:182
#1:
ffff888139ce4888
(
&of->mutex#2
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4f/0x2a0 fs/kernfs/file.c:172
#2:
ffff888114e2cb48
(
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: ffff88811f6fe198
(&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/0:7/6392:
1 lock held by syz-executor/8890:
1 lock held by syz-executor/8891:
1 lock held by syz-executor/8892:
1 lock held by syz-executor/8894:
7 locks held by kworker/0:0/8895:
1 lock held by modprobe/8898:
=============================================
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 01/24/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xcc3/0xfe0 kernel/hung_task.c:515
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
yealink 4-1:36.0: urb_irq_callback - urb status -71
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8895 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Workqueue: events_power_efficient gc_worker
RIP: 0010:number+0xa1/0xc90 lib/vsprintf.c:472
Code: 48 89 84 24 f8 00 00 00 31 c0 48 89 8c 24 80 00 00 00 e8 92 79 61 fa 48 8d bc 24 80 00 00 00 48 89 f8 48 c1 e8 03 0f b6 04 18 <84> c0 7f 06 0f 85 e1 0a 00 00 0f b6 84 24 80 00 00 00 48 8d bc 24
RSP: 0018:ffffc90000006f28 EFLAGS: 00000806
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 00000005ffff0a00
RDX: ffff888115ddd7c0 RSI: ffffffff874fc26e RDI: ffffc90000006fa8
RBP: ffffc90000007150 R08: 0000000000000005 R09: 000000000000002f
R10: 0000000000000010 R11: 0000000000318cd0 R12: 00000000000002a9
R13: ffffc90080007357 R14: ffffc90000007180 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff88826896a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c31e5d6 CR3: 000000011aafa000 CR4: 00000000003506f0
Call Trace:
vsnprintf+0x30e/0x1240 lib/vsprintf.c:2911
sprintf+0xcc/0x100 lib/vsprintf.c:3110
print_time kernel/printk/printk.c:1357 [inline]
info_print_prefix+0x25a/0x350 kernel/printk/printk.c:1383
record_print_text+0x143/0x3c0 kernel/printk/printk.c:1432
printk_get_next_message+0x2d1/0x6c0 kernel/printk/printk.c:3018
console_emit_next_record kernel/printk/printk.c:3083 [inline]
console_flush_one_record+0x67c/0xe50 kernel/printk/printk.c:3215
console_flush_all kernel/printk/printk.c:3289 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3319 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3359
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2426
dev_vprintk_emit+0x394/0x3e0 drivers/base/core.c:4914
dev_printk_emit+0xd2/0x10d drivers/base/core.c:4925
__dev_printk+0xcb/0x100 drivers/base/core.c:4937
_dev_err+0xef/0x127 drivers/base/core.c:4980
urb_irq_callback.cold+0x41/0xfd drivers/input/misc/yealink.c:418
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x516/0x990 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1858
handle_softirqs+0x1dd/0x8f0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xed/0x150 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+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x5e/0x330 kernel/locking/lockdep.c:5872
Code: 05 7b 34 3d 0b 83 f8 07 0f 87 a4 02 00 00 48 0f a3 05 06 aa 3e 09 0f 82 6f 02 00 00 8b 35 9e b6 3e 09 85 f6 0f 85 8a 00 00 00 <48> 8b 44 24 30 65 48 2b 05 1d 34 3d 0b 0f 85 b8 02 00 00 48 83 c4
RSP: 0018:ffffc900137b7a78 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff88dcbbf7 RDI: ffffffff878e97a0
RBP: ffffffff894da3a0 R08: 000000000039620c R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:867 [inline]
gc_worker+0x222/0x1630 net/netfilter/nf_conntrack_core.c:1546
process_one_work+0x9c2/0x1840 kernel/workqueue.c:3257
process_scheduled_works kernel/workqueue.c:3340 [inline]
worker_thread+0x5da/0xe40 kernel/workqueue.c:3421
kthread+0x3b3/0x730 kernel/kthread.c:463
ret_from_fork+0x6c3/0xa20 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246