INFO: task kworker/0:2:125 blocked for more than 143 seconds. Not tainted 6.1.141-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:24416 pid:125 ppid:2 flags:0x00004000 Workqueue: events rfkill_global_led_trigger_worker Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x555/0xaf0 kernel/locking/mutex.c:747 rfkill_global_led_trigger_worker+0x23/0xc0 net/rfkill/core.c:181 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 INFO: task syz.4.1832:10109 blocked for more than 143 seconds. Not tainted 6.1.141-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.1832 state:D stack:24416 pid:10109 ppid:4260 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x555/0xaf0 kernel/locking/mutex.c:747 device_lock include/linux/device.h:837 [inline] nfc_dev_down net/nfc/core.c:143 [inline] nfc_rfkill_set_block+0x4c/0x2d0 net/nfc/core.c:179 rfkill_set_block+0x1c6/0x420 net/rfkill/core.c:345 rfkill_fop_write+0x458/0x560 net/rfkill/core.c:1286 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd68598e929 RSP: 002b:00007fd686890038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd685bb5fa0 RCX: 00007fd68598e929 RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007fd685a10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd685bb5fa0 R15: 00007ffd835f1d58 INFO: task syz.3.1834:10114 blocked for more than 143 seconds. Not tainted 6.1.141-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.1834 state:D stack:26240 pid:10114 ppid:4262 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10e9/0x40d0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6696 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x555/0xaf0 kernel/locking/mutex.c:747 rfkill_unregister+0xc4/0x220 net/rfkill/core.c:1130 nfc_unregister_device+0x92/0x290 net/nfc/core.c:1167 virtual_ncidev_close+0x55/0x90 drivers/nfc/virtual_ncidev.c:170 __fput+0x22c/0x920 fs/file_table.c:320 task_work_run+0x1ca/0x250 kernel/task_work.c:203 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+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3ca538e929 RSP: 002b:00007fffae06a0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f3ca55b7ba0 RCX: 00007f3ca538e929 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f3ca55b7ba0 R08: 00000000000000cc R09: 00000006ae06a3bf R10: 00000000003ffd10 R11: 0000000000000246 R12: 000000000006781f R13: 00007f3ca55b6080 R14: ffffffffffffffff R15: 00007fffae06a1e0 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c92b430 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c92bc50 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/27: #0: ffffffff8c92aaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8c92aaa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8c92aaa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513 3 locks held by kworker/0:2/125: #0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc9000256fd00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #2: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x23/0xc0 net/rfkill/core.c:181 2 locks held by getty/4016: #0: ffff88814d43f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc9000326b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41b/0x1380 drivers/tty/n_tty.c:2198 2 locks held by syz.4.1832/10109: #0: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x19e/0x560 net/rfkill/core.c:1278 #1: ffff888055173100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #1: ffff888055173100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline] #1: ffff888055173100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x4c/0x2d0 net/nfc/core.c:179 2 locks held by syz.3.1834/10114: #0: ffff888055173100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #0: ffff888055173100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x5f/0x290 net/nfc/core.c:1165 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xc4/0x220 net/rfkill/core.c:1130 2 locks held by syz-executor/10411: #0: ffff8880302b5118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x740 drivers/bluetooth/hci_vhci.c:378 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x33/0x8a0 net/rfkill/core.c:1057 2 locks held by syz-executor/10413: #0: ffff88807d9ed918 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x740 drivers/bluetooth/hci_vhci.c:378 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x33/0x8a0 net/rfkill/core.c:1057 2 locks held by syz-executor/11355: #0: ffff88804e2ec918 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x740 drivers/bluetooth/hci_vhci.c:378 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x33/0x8a0 net/rfkill/core.c:1057 2 locks held by syz-executor/11356: #0: ffff88804e2ee118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x740 drivers/bluetooth/hci_vhci.c:378 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x33/0x8a0 net/rfkill/core.c:1057 2 locks held by syz-executor/12628: #0: ffff888056de7918 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x740 drivers/bluetooth/hci_vhci.c:378 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x33/0x8a0 net/rfkill/core.c:1057 2 locks held by syz-executor/12651: #0: ffff88805ca59918 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x740 drivers/bluetooth/hci_vhci.c:378 #1: ffffffff8ddefc68 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x33/0x8a0 net/rfkill/core.c:1057 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 nmi_cpu_backtrace+0x3f4/0x470 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xeee/0xf30 kernel/hung_task.c:377 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:735