Bluetooth: hci3: Opcode 0x0c1a failed: -110
Bluetooth: hci3: Error when powering off device on rfkill (-110)
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: lib/refcount.c:28 at 0x0, CPU#1: kworker/1:5/13308
Modules linked in:
CPU: 1 UID: 0 PID: 13308 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events rfkill_op_handler
RIP: 0010:refcount_warn_saturate+0xc9/0x120 lib/refcount.c:28
Code: 5d e9 0b c9 1a fd e8 06 c9 1a fd 48 8d 3d af e7 cc 0b 67 48 0f b9 3a 5b 5d e9 f3 c8 1a fd e8 ee c8 1a fd 48 8d 3d a7 e7 cc 0b <67> 48 0f b9 3a 5b 5d e9 db c8 1a fd e8 d6 c8 1a fd 48 8d 3d 9f e7
RSP: 0018:ffffc9000484f7d8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff84a2890c
RDX: ffff88801bfb8000 RSI: ffffffff84a28972 RDI: ffffffff906f7120
RBP: ffff88806e2cd478 R08: 0000000000000005 R09: 0000000000000004
R10: 0000000000000003 R11: 000000000b9d6c44 R12: ffff888012188000
R13: ffff88806e2cd478 R14: ffffffff85d883d0 R15: ffffffff90495fa0
FS:  0000000000000000(0000) GS:ffff888097aa3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f7464f9c CR3: 0000000050926000 CR4: 0000000000352ef0
DR0: 0000000000000004 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 klist_dec_and_del lib/klist.c:206 [inline]
 klist_put+0x11b/0x1b0 lib/klist.c:217
 klist_del lib/klist.c:230 [inline]
 klist_remove+0x13f/0x2e0 lib/klist.c:249
 device_move+0x12d/0x10d0 drivers/base/core.c:4615
 hci_conn_del_sysfs+0x81/0x180 net/bluetooth/hci_sysfs.c:75
 hci_conn_cleanup net/bluetooth/hci_conn.c:173 [inline]
 hci_conn_del+0x657/0x1180 net/bluetooth/hci_conn.c:1222
 hci_conn_hash_flush+0x186/0x260 net/bluetooth/hci_conn.c:2615
 hci_dev_close_sync+0x602/0x11d0 net/bluetooth/hci_sync.c:5308
 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:501
 hci_rfkill_set_block+0x225/0x360 net/bluetooth/hci_core.c:929
 rfkill_set_block+0x1fe/0x550 net/rfkill/core.c:346
 rfkill_epo+0x8e/0x1d0 net/rfkill/core.c:466
 __rfkill_handle_global_op net/rfkill/input.c:60 [inline]
 rfkill_op_handler+0x25c/0x270 net/rfkill/input.c:108
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3427
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	5d                   	pop    %rbp
   1:	e9 0b c9 1a fd       	jmp    0xfd1ac911
   6:	e8 06 c9 1a fd       	call   0xfd1ac911
   b:	48 8d 3d af e7 cc 0b 	lea    0xbcce7af(%rip),%rdi        # 0xbcce7c1
  12:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  17:	5b                   	pop    %rbx
  18:	5d                   	pop    %rbp
  19:	e9 f3 c8 1a fd       	jmp    0xfd1ac911
  1e:	e8 ee c8 1a fd       	call   0xfd1ac911
  23:	48 8d 3d a7 e7 cc 0b 	lea    0xbcce7a7(%rip),%rdi        # 0xbcce7d1
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	5b                   	pop    %rbx
  30:	5d                   	pop    %rbp
  31:	e9 db c8 1a fd       	jmp    0xfd1ac911
  36:	e8 d6 c8 1a fd       	call   0xfd1ac911
  3b:	48                   	rex.W
  3c:	8d                   	.byte 0x8d
  3d:	3d                   	.byte 0x3d
  3e:	9f                   	lahf
  3f:	e7                   	.byte 0xe7