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:24536 pid:33    tgid:33    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events rfkill_sync_work
Call Trace:
 <TASK>
 __schedule+0x1550/0x5060
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 nfc_dev_down+0x3b/0x290
 nfc_rfkill_set_block+0x2d/0x100
 rfkill_set_block+0x1d2/0x440
 rfkill_sync_work+0x114/0x200
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x5b0/0xb20
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.2.1808:11794 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1808      state:D stack:27744 pid:11794 tgid:11794 ppid:5822   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1550/0x5060
 schedule+0x164/0x360
 schedule_timeout+0xc3/0x2c0
 wait_for_completion+0x2cc/0x5e0
 __flush_work+0xa17/0xc50
 __cancel_work_sync+0xbe/0x110
 rfkill_unregister+0x92/0x220
 nfc_unregister_device+0x96/0x2f0
 virtual_ncidev_close+0x56/0x90
 __fput+0x44f/0xa70
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xfd/0x490
 do_syscall_64+0x2c6/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f937c39acb9
RSP: 002b:00007ffcac35ca38 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffcac35cb20 RCX: 00007f937c39acb9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000034fbd R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2fd20000 R11: 0000000000000246 R12: 00007ffcac35cb60
R13: 00007f937c615fac R14: 000000000003503e R15: 00007f937c615fa0
 </TASK>
INFO: task syz.1.1939:12239 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1939      state:D stack:25888 pid:12239 tgid:12238 ppid:5828   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1550/0x5060
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 rfkill_register+0x37/0x8e0
 nfc_register_device+0x14a/0x380
 nci_register_device+0x8a1/0xa00
 virtual_ncidev_open+0x129/0x1a0
 misc_open+0x2d5/0x350
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x7ce/0x1420
 vfs_open+0x3b/0x340
 path_openat+0x3486/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdc0159acb9
RSP: 002b:00007fdc024cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fdc01815fa0 RCX: 00007fdc0159acb9
RDX: 0000000000000002 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007fdc01608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdc01816038 R14: 00007fdc01815fa0 R15: 00007ffc5567f958
 </TASK>
INFO: task syz.0.1945:12256 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1945      state:D stack:28048 pid:12256 tgid:12254 ppid:5827   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1550/0x5060
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 misc_open+0x51/0x350
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x7ce/0x1420
 vfs_open+0x3b/0x340
 path_openat+0x3486/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd4039acb9
RSP: 002b:00007efd411df028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007efd40615fa0 RCX: 00007efd4039acb9
RDX: 00000000000a2f01 RSI: 00002000000001c0 RDI: ffffffffffffff9c
RBP: 00007efd40408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd40616038 R14: 00007efd40615fa0 R15: 00007ffed8e5ae38
 </TASK>
INFO: task syz.0.1945:12258 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1945      state:D stack:28048 pid:12258 tgid:12254 ppid:5827   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1550/0x5060
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 misc_open+0x51/0x350
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x7ce/0x1420
 vfs_open+0x3b/0x340
 path_openat+0x3486/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd4039acb9
RSP: 002b:00007efd4119d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007efd40616180 RCX: 00007efd4039acb9
RDX: 0000000000080001 RSI: 00002000000001c0 RDI: ffffffffffffff9c
RBP: 00007efd40408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd40616218 R14: 00007efd40616180 R15: 00007ffed8e5ae38
 </TASK>
INFO: task syz-executor:12266 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:27832 pid:12266 tgid:12266 ppid:1      task_flags:0x400040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1550/0x5060
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x829/0x1340
 misc_open+0x51/0x350
 chrdev_open+0x4cd/0x5e0
 do_dentry_open+0x7ce/0x1420
 vfs_open+0x3b/0x340
 path_openat+0x3486/0x3e20
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x220
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2debd55ed7
RSP: 002b:00007fff6de2ef70 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055558933a500 RCX: 00007f2debd55ed7
RDX: 0000000000000002 RSI: 00007f2debe06d3b RDI: ffffffffffffff9c
RBP: 00007f2dec0167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007fff6de2f2d8 R15: 0000000000000000
 </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+0x9d4/0x17a0
 #1: ffffc90000a97b80 ((work_completion)(&rfkill->sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8fa00a08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_sync_work+0x2e/0x200
 #3: ffff888176800100 (&dev->mutex){....}-{4:4}, at: nfc_dev_down+0x3b/0x290
1 lock held by khungtaskd/35:
 #0: ffffffff8e341aa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5653:
 #0: ffff88817737d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by syz.2.1808/11794:
 #0: ffff888176800100 (&dev->mutex){....}-{4:4}, at: nfc_unregister_device+0x63/0x2f0
3 locks held by syz.1.1939/12239:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
 #1: ffff8881aac30100 (&dev->mutex){....}-{4:4}, at: nfc_register_device+0xa1/0x380
 #2: ffffffff8fa00a08 (rfkill_global_mutex){+.+.}-{4:4}, at: rfkill_register+0x37/0x8e0
1 lock held by syz.0.1945/12256:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz.0.1945/12258:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12266:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12270:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12271:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12273:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12275:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12277:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12281:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12287:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350
1 lock held by syz-executor/12289:
 #0: ffffffff8eba09c8 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 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+0x1a9/0x280
 nmi_cpu_backtrace+0x3a9/0x3e0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x5b0/0xb20
 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:pv_native_safe_halt+0xf/0x20
Code: a7 4e 02 c3 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 83 c2 10 00 fb f4 <e9> bc f3 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8e007d80 EFLAGS: 00000282
RAX: 0090acadc7a42e00 RBX: ffffffff8198b69a RCX: 0090acadc7a42e00
RDX: 0000000000000001 RSI: ffffffff8d9b4508 RDI: ffffffff8be09160
RBP: ffffffff8e007ea8 R08: ffff8881210336db R09: 1ffff110242066db
R10: dffffc0000000000 R11: ffffed10242066dc R12: 1ffffffff1c12a68
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffffffff1c00fbc
FS:  0000000000000000(0000) GS:ffff88818e41f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558c41495e38 CR3: 000000000e13a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x13/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x1ea/0x4e0
 cpu_startup_entry+0x43/0x60
 rest_init+0x2de/0x300
 start_kernel+0x3a6/0x400
 x86_64_start_reservations+0x24/0x30
 x86_64_start_kernel+0x143/0x1c0
 common_startup_64+0x13e/0x147
 </TASK>
