INFO: task kworker/0:6:5875 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:6     state:D stack:24872 pid:5875  tgid:5875  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events rfkill_global_led_trigger_worker
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 rfkill_global_led_trigger_worker+0x27/0xd0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.2.589:8170 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.589       state:D stack:25128 pid:8170  tgid:8170  ppid:5821   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 rfkill_unregister+0xc8/0x220
 nfc_unregister_device+0x96/0x2a0
 virtual_ncidev_close+0x56/0x90
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xe9/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f44b158f6c9
RSP: 002b:00007ffee24540f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f44b17e7da0 RCX: 00007f44b158f6c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f44b17e7da0 R08: 000000000000022c R09: 0000001ee24543ef
R10: 00007f44b17e7cb0 R11: 0000000000000246 R12: 00000000000203f0
R13: 00007f44b17e6180 R14: ffffffffffffffff R15: 00007ffee2454210
 </TASK>
INFO: task syz.0.592:8182 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.592       state:D stack:25048 pid:8182  tgid:8180  ppid:5815   task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 nfc_rfkill_set_block+0x50/0x2e0
 rfkill_set_block+0x1d2/0x440
 rfkill_fop_write+0x44b/0x570
 vfs_write+0x27e/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc33a58f6c9
RSP: 002b:00007fc33b3dd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc33a7e5fa0 RCX: 00007fc33a58f6c9
RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007fc33a611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc33a7e6038 R14: 00007fc33a7e5fa0 R15: 00007ffca9d32fa8
 </TASK>
INFO: task syz-executor:8368 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:28008 pid:8368  tgid:8368  ppid:1      task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 rfkill_register+0x37/0x8e0
 hci_register_dev+0x3f5/0x890
 vhci_create_device+0x39c/0x650
 vhci_write+0x3ce/0x4a0
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5ac3b8e140
RSP: 002b:00007ffd110bc168 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5ac3b8e140
RDX: 0000000000000002 RSI: 00007ffd110bc17a RDI: 00000000000000ca
RBP: 00007f5ac3de67b8 R08: 0000000000000000 R09: 00007f5ac491d6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffd110bc4c8 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:8379 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:28008 pid:8379  tgid:8379  ppid:1      task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 rfkill_register+0x37/0x8e0
 hci_register_dev+0x3f5/0x890
 vhci_create_device+0x39c/0x650
 vhci_write+0x3ce/0x4a0
 vfs_write+0x5c9/0xb30
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb2ad8e140
RSP: 002b:00007ffef53cad18 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fcb2ad8e140
RDX: 0000000000000002 RSI: 00007ffef53cad2a RDI: 00000000000000ca
RBP: 00007fcb2afe67b8 R08: 0000000000000000 R09: 00007fcb2bb1d6c0
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffef53cb078 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8df3d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5641:
 #0: ffff888110c0b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/0:6/5875:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004c97ba0 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f5aca28 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_global_led_trigger_worker+0x27/0xd0
2 locks held by syz.2.589/8170:
 #0: ffff8881b214f100 (&dev->mutex){....}-{4:4}, at: nfc_unregister_device+0x63/0x2a0
 #1: ffffffff8f5aca28 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_unregister+0xc8/0x220
2 locks held by syz.0.592/8182:
 #0: ffffffff8f5aca28 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_fop_write+0x191/0x570
 #1: ffff8881b214f100 (&dev->mutex){....}-{4:4}, at: nfc_rfkill_set_block+0x50/0x2e0
2 locks held by syz-executor/8368:
 #0: ffff8881bb8c8918 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device+0x34/0x650
 #1: ffffffff8f5aca28 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x37/0x8e0
2 locks held by syz-executor/8379:
 #0: ffff8881bb8ce118 (&data->open_mutex){+.+.}-{4:4}, at: vhci_create_device+0x34/0x650
 #1: ffffffff8f5aca28 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x37/0x8e0
2 locks held by syz.1.693/8607:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
 #1: ffffffff8f5aca28 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_fop_open+0x12d/0x820
1 lock held by syz-executor/8610:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/8618:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/8619:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/8625:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/8628:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/8629:
 #0: ffffffff8e775528 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__enqueue_entity+0x4fc/0x5e0
Code: 28 00 74 08 48 89 ef e8 12 9d 90 00 48 3b 5d 00 73 18 48 8b 44 24 08 42 80 3c 28 00 74 08 48 89 ef e8 e8 9d 90 00 48 89 5d 00 <48> 8b 44 24 10 42 80 3c 28 00 48 8b 5c 24 18 74 08 48 89 df e8 db
RSP: 0018:ffffc90000007338 EFLAGS: 00000046
RAX: 1ffff1102404e017 RBX: 0000000000155cc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881026957f0
RBP: ffff8881026957b8 R08: ffff8881202700a7 R09: 0000000000000000
R10: ffff888120270098 R11: ffffed102404e015 R12: ffff888102695790
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000155cc0
FS:  0000000000000000(0000) GS:ffff88818eb38000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcade9bf68 CR3: 000000016d3ac000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 enqueue_task_fair+0x9ba/0x2920
 enqueue_task+0x75/0x420
 ttwu_do_activate+0x1f3/0x870
 sched_ttwu_pending+0x2ce/0x6e0
 __flush_smp_call_function_queue+0x86d/0xaa0
 __sysvec_call_function_single+0xa8/0x3d0
 sysvec_call_function_single+0x4f/0xc0
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:sched_balance_rq+0x430a/0x57a0
Code: 00 f6 84 24 a1 03 00 00 02 48 8b 9c 24 a8 00 00 00 0f 85 f3 00 00 00 f7 44 24 28 00 02 00 00 74 01 fb 44 8b b4 24 00 04 00 00 <41> f6 c6 02 0f 85 ff ef ff ff 41 f6 c6 04 0f 84 af 02 00 00 48 83
RSP: 0018:ffffc90000007780 EFLAGS: 00000206
RAX: f8b7872ba5fc4700 RBX: 0000000000000010 RCX: f8b7872ba5fc4700
RDX: 0000000000000000 RSI: ffffffff8d710331 RDI: ffffffff8bbf0760
RBP: ffffc90000007c38 R08: ffffffff8f7cfd77 R09: 1ffffffff1ef9fae
R10: dffffc0000000000 R11: fffffbfff1ef9faf R12: ffffc90000007b98
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88812123ae30
 sched_balance_domains+0x49f/0x9e0
 _nohz_idle_balance+0x59d/0x810
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_call_function_single+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:pv_native_safe_halt+0x13/0x20
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d f3 20 21 00 f3 0f 1e fa fb f4 <e9> c8 e6 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8dc07d80 EFLAGS: 00000286
RAX: f8b7872ba5fc4700 RBX: ffffffff81967b47 RCX: f8b7872ba5fc4700
RDX: 0000000000000001 RSI: ffffffff8d710331 RDI: ffffffff8bbf0760
RBP: ffffffff8dc07ea8 R08: ffff888121232fdb R09: 1ffff110242465fb
R10: dffffc0000000000 R11: ffffed10242465fc R12: ffffffff8f7cfd70
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b92a40
 default_idle+0x13/0x20
 default_idle_call+0x73/0xb0
 do_idle+0x1e7/0x510
 cpu_startup_entry+0x44/0x60
 rest_init+0x2de/0x300
 start_kernel+0x3ae/0x410
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x143/0x1c0
 common_startup_64+0x13e/0x147
 </TASK>
