INFO: task kworker/1:1:33 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D stack:21848 pid:33    tgid:33    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events rfkill_sync_work
Call Trace:
 <TASK>
 __schedule+0x14bc/0x5000
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 nfc_dev_down+0x3b/0x290
 nfc_rfkill_set_block+0x2d/0x100
 rfkill_set_block+0x1d2/0x440
 rfkill_sync_work+0x114/0x200
 process_scheduled_works+0xad1/0x1770
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x599/0xb30
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.2.6126:29081 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.6126      state:D stack:26872 pid:29081 tgid:29081 ppid:5838   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14bc/0x5000
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 __flush_work+0x9b9/0xbc0
 __cancel_work_sync+0xbe/0x110
 rfkill_unregister+0x92/0x220
 nfc_unregister_device+0x96/0x300
 virtual_ncidev_close+0x56/0x90
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xff/0x4f0
 do_syscall_64+0x2d0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7eff29f8f7c9
RSP: 002b:00007ffc1f043a48 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000009438b RCX: 00007eff29f8f7c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007eff2a1e7da0 R08: 0000000000000001 R09: 0000001e1f043d3f
R10: 0000001b30520000 R11: 0000000000000246 R12: 00007eff2a1e5fac
R13: 00007eff2a1e5fa0 R14: ffffffffffffffff R15: 00007ffc1f043b60
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/1:1/33:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90000a97b80 ((work_completion)(&rfkill->sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8f5fd668 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_sync_work+0x2e/0x200
 #3: ffff888171ae6100 (&dev->mutex){....}-{4:4}, at: nfc_dev_down+0x3b/0x290
1 lock held by khungtaskd/36:
 #0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5655:
 #0: ffff888173cd90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460
1 lock held by syz.2.6126/29081:
 #0: ffff888171ae6100 (&dev->mutex){....}-{4:4}, at: nfc_unregister_device+0x63/0x300
3 locks held by syz.0.6164/29227:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
 #1: ffff888109fa9100 (&dev->mutex){....}-{4:4}, at: nfc_register_device+0xa1/0x390
 #2: ffffffff8f5fd668 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x37/0x8e0
1 lock held by syz.0.6164/29231:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz.1.6165/29234:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz.1.6165/29235:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29242:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29245:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29246:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29248:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29250:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29252:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29254:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29256:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/29258:
 #0: ffffffff8e79fae8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 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
 sys_info+0x135/0x170
 watchdog+0xf95/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x599/0xb30
 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 93 90 0c 00 f3 0f 1e fa fb f4 <e9> c8 ed 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: ffb66059262d8700 RBX: ffffffff81978fda RCX: ffb66059262d8700
RDX: 0000000000000001 RSI: ffffffff8d7925e3 RDI: ffffffff8bc08360
RBP: ffffc90000197f10 R08: ffff88823c6336db R09: 1ffff110478c66db
R10: dffffc0000000000 R11: ffffed10478c66dc R12: ffffffff8f822070
R13: 1ffff1102c09e000 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8882a9e35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558846598028 CR3: 000000000dd3a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x13/0x20
 default_idle_call+0x73/0xb0
 do_idle+0x1ea/0x520
 cpu_startup_entry+0x44/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x147
 </TASK>
