INFO: task kworker/0:4:5873 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:23176 pid:5873  tgid:5873  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.1.24:5965 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.24        state:D stack:25128 pid:5965  tgid:5965  ppid:5802   task_flags:0x400040 flags:0x00080003
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: 0033:0x7f546b38f6c9
RSP: 002b:00007ffcd88cf208 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f546b5e7da0 RCX: 00007f546b38f6c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f546b5e7da0 R08: 0000000000000228 R09: 0000001ed88cf4ff
R10: 00007f546b5e7cb0 R11: 0000000000000246 R12: 000000000000f066
R13: 00007f546b5e6090 R14: ffffffffffffffff R15: 00007ffcd88cf320
 </TASK>
INFO: task syz.0.27:5980 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.27        state:D stack:24352 pid:5980  tgid:5974  ppid:5807   task_flags:0x400040 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: 0033:0x7fbfc3d8f6c9
RSP: 002b:00007fbfc4cf0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbfc3fe6090 RCX: 00007fbfc3d8f6c9
RDX: 0000000000000008 RSI: 0000200000000080 RDI: 0000000000000003
RBP: 00007fbfc3e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfc3fe6128 R14: 00007fbfc3fe6090 R15: 00007ffe33d81e28
 </TASK>
INFO: task syz.2.30:6020 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.30        state:D stack:25192 pid:6020  tgid:6019  ppid:5806   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 rfkill_register+0x37/0x8e0
 nfc_register_device+0x14a/0x320
 nci_register_device+0x87f/0x9d0
 virtual_ncidev_open+0x129/0x1a0
 misc_open+0x2d5/0x350
 chrdev_open+0x4cc/0x5e0
 do_dentry_open+0x953/0x13f0
 vfs_open+0x3b/0x340
 path_openat+0x2ee5/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0730f8f6c9
RSP: 002b:00007f0731d4c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f07311e5fa0 RCX: 00007f0730f8f6c9
RDX: 0000000000000002 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f0731011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f07311e6038 R14: 00007f07311e5fa0 R15: 00007ffc58927478
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5633:
 #0: ffff888101f690a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/0:4/5873:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004ea7ba0 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f5aa1e8 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_global_led_trigger_worker+0x27/0xd0
2 locks held by syz.1.24/5965:
 #0: ffff8880209a6100 (&dev->mutex){....}-{4:4}, at: nfc_unregister_device+0x63/0x2a0
 #1: ffffffff8f5aa1e8 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_unregister+0xc8/0x220
2 locks held by syz.0.27/5980:
 #0: ffffffff8f5aa1e8 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_fop_write+0x191/0x570
 #1: ffff8880209a6100 (&dev->mutex){....}-{4:4}, at: nfc_rfkill_set_block+0x50/0x2e0
3 locks held by syz.2.30/6020:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
 #1: ffff88801f064100 (&dev->mutex){....}-{4:4}, at: nfc_register_device+0xa1/0x320
 #2: ffffffff8f5aa1e8 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x37/0x8e0
1 lock held by syz-executor/6027:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6028:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6030:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6048:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6050:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6052:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6055:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6057:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/6059:
 #0: ffffffff8e7752a8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350

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

NMI backtrace for cpu 0
CPU: 0 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 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: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 33 11 22 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:ffffc90000197de0 EFLAGS: 00000286
RAX: 9127486bc41a3c00 RBX: ffffffff81967b87 RCX: 9127486bc41a3c00
RDX: 0000000000000001 RSI: ffffffff8d70c1de RDI: ffffffff8bbf05e0
RBP: ffffc90000197f10 R08: ffff88823c632fdb R09: 1ffff110478c65fb
R10: dffffc0000000000 R11: ffffed10478c65fc R12: ffffffff8f7cce70
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff1102c1d1000
FS:  0000000000000000(0000) GS:ffff8882a9f3e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f752a233516 CR3: 000000000dd38000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x13/0x20
 default_idle_call+0x73/0xb0
 do_idle+0x1e7/0x510
 cpu_startup_entry+0x44/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x147
 </TASK>
