INFO: task kworker/0:1:9 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:1 state:D stack:24232 pid:9 ppid:2 flags:0x00004000
Workqueue: events rfkill_global_led_trigger_worker
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747
rfkill_global_led_trigger_worker+0x27/0xd0 net/rfkill/core.c:182
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INFO: task syz.1.141:6414 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.141 state:D stack:25320 pid:6414 ppid:5762 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747
rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1149
nfc_unregister_device+0x96/0x2a0 net/nfc/core.c:1167
virtual_ncidev_close+0x59/0x90 drivers/nfc/virtual_ncidev.c:172
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1ce/0x250 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb42018f749
RSP: 002b:00007fffe5b04a98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb4203e7da0 RCX: 00007fb42018f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb4203e7da0 R08: 0000000000000118 R09: 00000010e5b04d8f
R10: 00007fb4203e7cb0 R11: 0000000000000246 R12: 0000000000023a76
R13: 00007fffe5b04b90 R14: ffffffffffffffff R15: 00007fffe5b04bb0
INFO: task syz.1.141:6416 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.141 state:D stack:24656 pid:6416 ppid:5762 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747
device_lock include/linux/device.h:995 [inline]
nfc_dev_down net/nfc/core.c:143 [inline]
nfc_rfkill_set_block+0x50/0x2e0 net/nfc/core.c:179
rfkill_set_block+0x1c6/0x420 net/rfkill/core.c:346
rfkill_fop_write+0x45c/0x570 net/rfkill/core.c:1305
vfs_write+0x288/0x940 fs/read_write.c:582
ksys_write+0x147/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb42018f749
RSP: 002b:00007fb41e3d5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb4203e6090 RCX: 00007fb42018f749
RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000003
RBP: 00007fb420213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb4203e6128 R14: 00007fb4203e6090 R15: 00007fffe5b04938
INFO: task syz-executor:6629 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:27504 pid:6629 ppid:1 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747
rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075
hci_register_dev+0x3f5/0x890 net/bluetooth/hci_core.c:2625
__vhci_create_device drivers/bluetooth/hci_vhci.c:452 [inline]
vhci_create_device+0x38b/0x650 drivers/bluetooth/hci_vhci.c:480
vhci_get_user drivers/bluetooth/hci_vhci.c:537 [inline]
vhci_write+0x3b5/0x470 drivers/bluetooth/hci_vhci.c:617
call_write_iter include/linux/fs.h:2018 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x43b/0x940 fs/read_write.c:584
ksys_write+0x147/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f958d18e1c0
RSP: 002b:00007fff089d4e28 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f958d18e1c0
RDX: 0000000000000002 RSI: 00007fff089d4e3a RDI: 00000000000000ca
RBP: 00007f958d3e67b8 R08: 0000000000000000 R09: 00007f958df1d6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007fff089d5188 R15: 0000000000000000
Showing all locks held in the system:
3 locks held by kworker/0:1/9:
#0: ffff888017870938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017870938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc900000e7d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc900000e7d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#2: ffffffff8e2908a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x27/0xd0 net/rfkill/core.c:182
1 lock held by khungtaskd/29:
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:7/2949:
2 locks held by getty/5527:
#0: ffff88814cdff0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
2 locks held by syz.1.141/6414:
#0: ffff88802dbed100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:995 [inline]
#0: ffff88802dbed100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x63/0x2a0 net/nfc/core.c:1165
#1: ffffffff8e2908a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1149
2 locks held by syz.1.141/6416:
#0: ffffffff8e2908a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a2/0x570 net/rfkill/core.c:1297
#1: ffff88802dbed100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:995 [inline]
#1: ffff88802dbed100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline]
#1: ffff88802dbed100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x50/0x2e0 net/nfc/core.c:179
2 locks held by syz-executor/6629:
#0: ffff888059b6f118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x650 drivers/bluetooth/hci_vhci.c:479
#1: ffffffff8e2908a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075
2 locks held by syz.2.196/6688:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
#1: ffffffff8e2908a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_open+0x12d/0x820 net/rfkill/core.c:1182
1 lock held by syz.2.196/6689:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz.3.206/6730:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz.0.207/6731:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6737:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6743:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6744:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6746:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6748:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6755:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6756:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6758:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
1 lock held by syz-executor/6760:
#0: ffffffff8d4c2e28 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x59/0x3a0 drivers/char/misc.c:125
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2949 Comm: kworker/u4:7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:preempt_count_add+0x61/0x1a0 kernel/sched/core.c:5848
Code: 5d 48 a8 7e 65 01 3d 56 48 a8 7e 48 c7 c0 80 b4 e9 96 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e6 00 00 00 83 3d ef 46 8e 15 00 <75> 11 65 8b 05 2e 48 a8 7e 0f b6 c0 3d f5 00 00 00 73 58 65 8b 05
RSP: 0018:ffffc9000bd576e0 EFLAGS: 00000046
RAX: 0000000000000004 RBX: 00002aaaaaaac000 RCX: ffffffff96e9b403
RDX: 1ffff920017aaee8 RSI: 00002aaaaaaab000 RDI: 0000000000000001
RBP: ffffc9000bd577d0 R08: 0000000000000000 R09: 1ffffffff19c2f17
R10: dffffc0000000000 R11: fffffbfff19c2f18 R12: ffffffff81dc22b9
R13: dffffc0000000000 R14: 1ffff920017aaf0c R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b68820bd0 CR3: 000000000cb30000 CR4: 00000000003506f0
Call Trace:
flush_tlb_mm_range+0x8d/0x690 arch/x86/mm/tlb.c:1056
__text_poke+0x81c/0xb20 arch/x86/kernel/alternative.c:2084
text_poke arch/x86/kernel/alternative.c:2121 [inline]
text_poke_bp_batch+0x768/0x930 arch/x86/kernel/alternative.c:2510
text_poke_flush arch/x86/kernel/alternative.c:2623 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2630
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:237
static_key_disable+0x1a/0x20 kernel/jump_label.c:245
toggle_allocation_gate+0x1b0/0x250 mm/kfence/core.c:836
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293