INFO: task kworker/0:2:2810 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:2 state:D
stack:22136 pid:2810 tgid:2810 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events request_firmware_work_func
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
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0xc9a/0x1b90 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+0x3b2/0x530 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+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
Showing all locks held in the system:
4 locks held by kworker/0:0/9:
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
6 locks held by kworker/1:1/37:
#0:
ffff888105af4548
(
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1:
ffffc90000277ca8
(
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2:
ffff88810a763198
(
&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:
ffff88810a3ac510
(&port_dev->status_lock
){+.+.}-{4:4}
, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline]
, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
, at: port_event drivers/usb/core/hub.c:5871 [inline]
, at: hub_event+0x2bd2/0x4af0 drivers/usb/core/hub.c:5953
#4:
ffff888107770668
(
hcd->address0_mutex){+.+.}-{4:4}
, at: hub_port_connect drivers/usb/core/hub.c:5465 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
, at: port_event drivers/usb/core/hub.c:5871 [inline]
, at: hub_event+0x2bfb/0x4af0 drivers/usb/core/hub.c:5953
#5:
ffffffff8a0c9010
(ehci_cf_port_reset_rwsem
){.+.+}-{4:4}
, at: hub_port_reset+0x1a5/0x1c60 drivers/usb/core/hub.c:3067
3 locks held by kworker/u8:5/59:
#0: ffff8881125de148
(
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1: ffffc90000577ca8
(
(work_completion)(&(&net->ipv6.addr_chk_work)->work)
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2:
ffffffff8a8cc4e8 (
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4734
5 locks held by kworker/u8:7/312:
#0:
ffff888100ac4948
(
(wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1:
ffffc90001747ca8
(net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2: ffffffff8a8b3eb0
(pernet_ops_rwsem
){++++}-{4:4}
, at: cleanup_net+0xab/0x900 net/core/net_namespace.c:670
#3:
ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: default_device_exit_batch+0x90/0xc60 net/core/dev.c:13037
#4:
ffffffff894e6b78 (
rcu_state.exp_mutex){+.+.}-{4:4}
, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343
6 locks held by kworker/1:2/1122:
2 locks held by kworker/u8:12/1434:
2 locks held by kworker/u8:15/2473:
3 locks held by kworker/0:2/2810:
2 locks held by getty/2924:
#0: ffff8881160200a0
(
&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
4 locks held by udevd/5196:
1 lock held by udevd/5199:
#0:
ffff888100ac5988
(
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1185
3 locks held by kworker/1:3/5232:
#0:
ffff888100072948
(
(wq_completion)events_power_efficient
){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1:
ffffc900021efca8
((reg_check_chans).work
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2:
ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: reg_check_chans_work+0x91/0x10e0 net/wireless/reg.c:2453
3 locks held by kworker/0:4/5260:
#0: ffff888100071948
(
(wq_completion)events
){+.+.}-{0:0}
, at: process_one_work+0x11ae/0x1840 kernel/workqueue.c:3232
#1:
ffffc900022bfca8
(
free_ipc_work
){+.+.}-{0:0}
, at: process_one_work+0x927/0x1840 kernel/workqueue.c:3233
#2:
ffffffff894e6b78
(rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343
1 lock held by udevd/5312:
#0: ffff888100ac5988
(&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1185
4 locks held by kworker/1:5/5322:
2 locks held by syz-executor/5777:
#0:
ffffffff8a8b3eb0
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1:
ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5788:
#0:
ffffffff8a8b3eb0
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1: ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5789:
#0: ffffffff8a8b3eb0
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1:
ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5808:
#0:
ffffffff8a8b3eb0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1: ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5810:
#0: ffffffff8a8b3eb0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1: ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5827:
#0: ffffffff8a8b3eb0
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1:
ffffffff8a8cc4e8
(
rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5838:
#0: ffffffff8a8b3eb0
(
pernet_ops_rwsem){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1:
ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5840:
#0:
ffffffff8a8b3eb0 (
pernet_ops_rwsem){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1: ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5858:
#0: ffffffff8a8b3eb0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1:
ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
2 locks held by syz-executor/5860:
#0: ffffffff8a8b3eb0
(pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x41e/0x780 net/core/net_namespace.c:577
#1: ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2096
1 lock held by syz-executor/5878:
#0:
ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/5883:
#0:
ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/5885:
#0: ffffffff8a8cc4e8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/5891:
#0:
ffffffff8a8cc4e8
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/5893:
#0:
ffffffff8a8cc4e8
(
rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
=============================================
NMI backtrace for cpu 0
CPU: 0 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:
__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 0 to CPUs 1:
yealink 3-1:36.0: unexpected response 0
yealink 3-1:36.0: urb_ctl_callback - urb status -71
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5235 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events free_obj_work
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x36/0x90 kernel/kcov.c:246
Code: f1 49 89 d2 65 48 8b 3d 10 0b 1a 0b a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 c0 34 a5 05 8b 87 64 15 00 00 <85> c0 74 f1 8b 87 40 15 00 00 83 f8 03 75 e6 48 8b 87 48 15 00 00
RSP: 0018:ffffc900001a8048 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff8750fd4e
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888111a60000
RBP: ffffffff88662880 R08: 0000000000000001 R09: 0000000000000002
R10: 0000000000000000 R11: 00000000001b3670 R12: 0000000000000000
R13: 0000000000000008 R14: 0000000000000001 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888268a6c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb681b01000 CR3: 00000000092a8000 CR4: 00000000003506f0
Call Trace:
__sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:351
vsnprintf+0x1fe/0x1240 lib/vsprintf.c:2891
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_ctl_callback.cold+0x41/0x8c drivers/input/misc/yealink.c:456
__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_release+0x19e/0x2e0 kernel/locking/lockdep.c:5893
Code: ff 65 0f c1 05 bb 51 3d 0b 83 f8 01 0f 85 f7 00 00 00 9c 58 f6 c4 02 0f 85 0c 01 00 00 41 f7 c6 00 02 00 00 0f 85 99 00 00 00 <48> 8b 44 24 10 65 48 2b 05 ad 0d 3d 0b 0f 85 0f 01 00 00 48 83 c4
RSP: 0018:ffffc9000220f638 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff894da3a0 RCX: ffffc9000220f644
RDX: 0000000000000002 RSI: ffffffff88dcb13b RDI: ffffffff878e97a0
RBP: ffffffff816f2b7e R08: 0000000000000001 R09: 0000000000000007
R10: 0000000000000200 R11: 000000000001c46d R12: ffff888111a60000
R13: ffffc9000220f6f0 R14: 0000000000000206 R15: 0000000000000003
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x3c3/0x1ea0 arch/x86/kernel/unwind_orc.c:495
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x43/0x70 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kmem_cache_free+0x124/0x6d0 mm/slub.c:6781
free_object_list.isra.0+0x196/0x2a0 lib/debugobjects.c:326
free_obj_work+0x19d/0x3d0 lib/debugobjects.c:513
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