Bluetooth: hci0: Opcode 0x0c1a failed: -110
Bluetooth: hci0: Error when powering off device on rfkill (-110)
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 3 PID: 61 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 3 UID: 0 PID: 61 Comm: kworker/3:1 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+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 b8 4e 11 fd 84 db 0f 85 66 ff ff ff e8 cb 53 11 fd c6 05 e6 d3 bf 0b 01 90 48 c7 c7 60 31 f1 8b e8 57 88 cf fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 a8 53 11 fd 0f b6 1d c1 d3 bf 0b 31
RSP: 0018:ffffc90000cf7848 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817b6ee8
RDX: ffff88801e6bc900 RSI: ffffffff817b6ef5 RDI: 0000000000000001
RBP: ffff888044c6b478 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804d9fb400
R13: ffff888044c6b478 R14: ffffffff85e1d5d0 R15: ffffffff906672a0
FS:  0000000000000000(0000) GS:ffff8880d6cd9000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c5dd10300 CR3: 000000003192b000 CR4: 0000000000352ef0
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:1210
 hci_conn_hash_flush+0x186/0x260 net/bluetooth/hci_conn.c:2603
 hci_dev_close_sync+0x602/0x11d0 net/bluetooth/hci_sync.c:5303
 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+0x262/0x280 net/rfkill/input.c:108
 process_one_work+0x9cf/0x1b70 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+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>