INFO: task kworker/0:3:1213 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3 state:D stack:23000 pid:1213 tgid:1213 ppid:2 task_flags:0x4208160 flags:0x00080000
Workqueue: events rfkill_sync_work
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
rfkill_sync_work+0x1b/0x40 net/rfkill/core.c:1055
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task kworker/0:4:5887 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:4 state:D stack:23400 pid:5887 tgid:5887 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events rfkill_global_led_trigger_worker
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
rfkill_global_led_trigger_worker+0x1b/0x160 net/rfkill/core.c:182
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.2.413:7621 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.413 state:D stack:25240 pid:7621 tgid:7621 ppid:5807 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:121
__flush_work+0x7d7/0xcc0 kernel/workqueue.c:4273
__cancel_work_sync+0x10c/0x130 kernel/workqueue.c:4393
rfkill_unregister+0x95/0x2c0 net/rfkill/core.c:1139
nfc_unregister_device+0x94/0x330 net/nfc/core.c:1167
virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:172
__fput+0x402/0xb70 fs/file_table.c:468
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd4a0f8f6c9
RSP: 002b:00007fff033d5898 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fd4a11e7da0 RCX: 00007fd4a0f8f6c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fd4a11e7da0 R08: 000000000000021c R09: 0000001e033d5b8f
R10: 00007fd4a11e7cb0 R11: 0000000000000246 R12: 0000000000030db5
R13: 00007fff033d5990 R14: ffffffffffffffff R15: 00007fff033d59b0
INFO: task syz.2.413:7632 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.413 state:D stack:25816 pid:7632 tgid:7621 ppid:5807 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
device_lock include/linux/device.h:914 [inline]
nfc_dev_down+0x2d/0x2e0 net/nfc/core.c:143
nfc_rfkill_set_block+0x39/0xe0 net/nfc/core.c:179
rfkill_set_block+0x1fe/0x550 net/rfkill/core.c:346
rfkill_fop_write+0x2c0/0x580 net/rfkill/core.c:1301
vfs_write+0x2a0/0x11d0 fs/read_write.c:684
ksys_write+0x1f8/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd4a0f8f6c9
RSP: 002b:00007fd4a1daa038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd4a11e6180 RCX: 00007fd4a0f8f6c9
RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000007
RBP: 00007fd4a1011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4a11e6218 R14: 00007fd4a11e6180 R15: 00007fff033d5738
INFO: task syz.3.421:7679 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.421 state:D stack:26152 pid:7679 tgid:7674 ppid:5815 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
rfkill_register+0x3a/0xb40 net/rfkill/core.c:1071
hci_register_dev+0x3cc/0xc60 net/bluetooth/hci_core.c:2631
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:691 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:717 [inline]
hci_uart_tty_ioctl+0x7e2/0xc30 drivers/bluetooth/hci_ldisc.c:771
tty_ioctl+0x700/0x1680 drivers/tty/tty_io.c:2801
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+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f67ed38f6c9
RSP: 002b:00007f67ee1e2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f67ed5e6270 RCX: 00007f67ed38f6c9
RDX: 0000000400000009 RSI: 00000000400455c8 RDI: 0000000000000006
RBP: 00007f67ed411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f67ed5e6308 R14: 00007f67ed5e6270 R15: 00007ffc051af7c8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3c4760 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c4760 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e3c4760 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
3 locks held by kworker/0:3/1213:
#0: ffff88813ff11948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238
#1: ffffc9000457fd00 ((work_completion)(&rfkill->sync_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239
#2: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_sync_work+0x1b/0x40 net/rfkill/core.c:1055
2 locks held by getty/5570:
#0: ffff8880354b50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by kworker/0:4/5887:
#0: ffff88813ff11948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238
#1: ffffc90003087d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239
#2: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_global_led_trigger_worker+0x1b/0x160 net/rfkill/core.c:182
1 lock held by syz.2.413/7621:
#0: ffff88805541b100 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#0: ffff88805541b100 (&dev->mutex){....}-{4:4}, at: nfc_unregister_device+0x60/0x330 net/nfc/core.c:1165
2 locks held by syz.2.413/7632:
#0: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_fop_write+0x166/0x580 net/rfkill/core.c:1293
#1: ffff88805541b100 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#1: ffff88805541b100 (&dev->mutex){....}-{4:4}, at: nfc_dev_down+0x2d/0x2e0 net/nfc/core.c:143
2 locks held by syz.3.421/7679:
#0: ffff8880284790a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x3a/0xb40 net/rfkill/core.c:1071
2 locks held by syz-executor/7859:
#0: ffff88807a3a3918 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device drivers/bluetooth/hci_vhci.c:478 [inline]
#0: ffff88807a3a3918 (&data->open_mutex){+.+.}-{4:4}, at: vhci_get_user drivers/bluetooth/hci_vhci.c:536 [inline]
#0: ffff88807a3a3918 (&data->open_mutex){+.+.}-{4:4}, at: vhci_write+0x2b4/0x480 drivers/bluetooth/hci_vhci.c:616
#1: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x3a/0xb40 net/rfkill/core.c:1071
2 locks held by syz-executor/7895:
#0: ffff8880792ef118 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device drivers/bluetooth/hci_vhci.c:478 [inline]
#0: ffff8880792ef118 (&data->open_mutex){+.+.}-{4:4}, at: vhci_get_user drivers/bluetooth/hci_vhci.c:536 [inline]
#0: ffff8880792ef118 (&data->open_mutex){+.+.}-{4:4}, at: vhci_write+0x2b4/0x480 drivers/bluetooth/hci_vhci.c:616
#1: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x3a/0xb40 net/rfkill/core.c:1071
3 locks held by syz.0.472/7948:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
#1: ffff88805a356100 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#1: ffff88805a356100 (&dev->mutex){....}-{4:4}, at: nfc_register_device+0x9a/0x3c0 net/nfc/core.c:1128
#2: ffffffff90591b08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x3a/0xb40 net/rfkill/core.c:1071
1 lock held by syz.5.474/7947:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz.4.479/7971:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7978:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7979:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7981:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7983:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7985:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7991:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7992:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7995:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7997:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
1 lock held by syz-executor/7999:
#0: ffffffff8f074368 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x450 drivers/char/misc.c:125
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__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]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf3f/0x1170 kernel/hung_task.c:495
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1054 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:check_preemption_disabled+0x25/0xe0 lib/smp_processor_id.c:54
Code: 90 90 90 90 90 41 54 55 53 48 83 ec 08 65 8b 1d f5 c5 40 08 65 8b 05 ea c5 40 08 a9 ff ff ff 7f 74 0f 48 83 c4 08 89 d8 5b 5d <41> 5c e9 44 ed 02 00 9c 58 f6 c4 02 74 ea 48 89 fd 65 48 8b 05 aa
RSP: 0018:ffffc90003edf7f8 EFLAGS: 00000086
RAX: 0000000000000001 RBX: ffff8880b8539240 RCX: 000000000000000c
RDX: 1ffff110170a724b RSI: ffffffff8bf06fc0 RDI: ffffffff8bf07000
RBP: 000000000002c92d R08: 0000000000000000 R09: 000000000002c92d
R10: ffff88813ff1875f R11: 0000000000000001 R12: 0000000000000000
R13: ffff88813ff18000 R14: 00002aaaaaaac000 R15: 00002aaaaaaab000
FS: 0000000000000000(0000) GS:ffff888124b08000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec27f72bd0 CR3: 000000000e182000 CR4: 00000000003526f0
Call Trace:
get_flush_tlb_info+0x192/0x2b0 arch/x86/mm/tlb.c:1433
flush_tlb_mm_range+0xbf/0x17a0 arch/x86/mm/tlb.c:1459
__text_poke+0x471/0xb70 arch/x86/kernel/alternative.c:2575
smp_text_poke_batch_finish+0x652/0xdb0 arch/x86/kernel/alternative.c:3001
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
jump_label_update+0x376/0x550 kernel/jump_label.c:919
static_key_disable_cpuslocked+0x158/0x1c0 kernel/jump_label.c:240
static_key_disable+0x1a/0x20 kernel/jump_label.c:248
toggle_allocation_gate mm/kfence/core.c:857 [inline]
toggle_allocation_gate+0x145/0x280 mm/kfence/core.c:844
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3263
process_scheduled_works kernel/workqueue.c:3346 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245