INFO: task kworker/0:0:8 blocked for more than 143 seconds. Not tainted 6.6.101-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:22416 pid:8 ppid:2 flags:0x00004000 Workqueue: events rfkill_global_led_trigger_worker Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833 __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.0.313:6704 blocked for more than 143 seconds. Not tainted 6.6.101-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.313 state:D stack:25456 pid:6704 ppid:5785 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833 __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+0xb1/0x140 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: 0033:0x7f5feb58eb69 RSP: 002b:00007f5fec464038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffea RBX: 00007f5feb7b5fa0 RCX: 00007f5feb58eb69 RDX: 0000000000005400 RSI: 0000200000000080 RDI: ffffffffffffff9c RBP: 00007f5feb611df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5feb7b5fa0 R15: 00007ffd9e026368 INFO: task syz.1.314:6709 blocked for more than 144 seconds. Not tainted 6.6.101-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.314 state:D stack:25256 pid:6709 ppid:5789 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x14d2/0x44d0 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6b7/0xcc0 kernel/locking/mutex.c:747 device_lock include/linux/device.h:992 [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: 0033:0x7f27e158eb69 RSP: 002b:00007f27e2443038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f27e17b5fa0 RCX: 00007f27e158eb69 RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000003 RBP: 00007f27e1611df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f27e17b5fa0 R15: 00007ffc18686b88 Showing all locks held in the system: 3 locks held by kworker/0:0/8: #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: ffffc900000d7d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline] #1: ffffc900000d7d00 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711 #2: ffffffff8e296f28 (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: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633 2 locks held by getty/5549: #0: ffff88802d84f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217 1 lock held by syz-executor/5786: #0: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1149 1 lock held by syz.3.153/6278: #0: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1149 2 locks held by syz.0.313/6704: #0: ffff888030d60100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline] #0: ffff888030d60100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x63/0x2a0 net/nfc/core.c:1165 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xc8/0x220 net/rfkill/core.c:1149 2 locks held by syz.1.314/6709: #0: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a2/0x570 net/rfkill/core.c:1297 #1: ffff888030d60100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline] #1: ffff888030d60100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down net/nfc/core.c:143 [inline] #1: ffff888030d60100 (&dev->mutex){....}-{3:3}, at: nfc_rfkill_set_block+0x50/0x2e0 net/nfc/core.c:179 2 locks held by syz-executor/7086: #0: ffff88801e6e1918 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x6e0 drivers/bluetooth/hci_vhci.c:471 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075 2 locks held by syz-executor/7090: #0: ffff888024a03918 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x6e0 drivers/bluetooth/hci_vhci.c:471 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075 2 locks held by syz-executor/7126: #0: ffff88805cbbb118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x6e0 drivers/bluetooth/hci_vhci.c:471 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075 2 locks held by syz-executor/7128: #0: ffff88807a35e118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x6e0 drivers/bluetooth/hci_vhci.c:471 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075 2 locks held by syz-executor/7134: #0: ffff88807999d118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x6e0 drivers/bluetooth/hci_vhci.c:471 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075 2 locks held by syz-executor/7136: #0: ffff88805c035118 (&data->open_mutex){+.+.}-{3:3}, at: vhci_create_device+0x34/0x6e0 drivers/bluetooth/hci_vhci.c:471 #1: ffffffff8e296f28 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_register+0x37/0x8e0 net/rfkill/core.c:1075 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1094 Comm: kworker/u4:7 Not tainted 6.6.101-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:static_key_disable+0x0/0x20 kernel/jump_label.c:243 Code: e1 2a 00 e9 ee fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 53 ff ff ff 48 89 df e8 1a e1 2a 00 e9 46 ff ff ff 0f 1f 44 00 00 0f 1e fa 53 48 89 fb e8 23 9b d3 ff e8 0e 32 9e ff 48 89 df e8 RSP: 0018:ffffc900044ffad8 EFLAGS: 00000293 RAX: ffffffff81dd3309 RBX: 0000000000000001 RCX: ffff888023600000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff96f104a0 RBP: ffffc900044ffbb0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff19c5a64 R12: 1ffff9200089ff5c R13: dffffc0000000000 R14: ffffffff8157c3c7 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fda810e4de0 CR3: 000000000cb30000 CR4: 00000000003506e0 Call Trace: 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