------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 9744 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0
Modules linked in:
CPU: 1 UID: 0 PID: 9744 Comm: syz.0.1268 Not tainted 6.16.0-syzkaller-06620-gae633388cae3-dirty #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:refcount_warn_saturate+0x11a/0x1d0
Code: 20 85 e2 8b e8 87 3d be fc 90 0f 0b 90 90 eb d7 e8 cb 99 fa fc c6 05 47 62 c5 0a 01 90 48 c7 c7 80 85 e2 8b e8 67 3d be fc 90 <0f> 0b 90 90 eb b7 e8 ab 99 fa fc c6 05 24 62 c5 0a 01 90 48 c7 c7
RSP: 0018:ffffc90007077598 EFLAGS: 00010246
RAX: 19b1f4da9256b400 RBX: 0000000000000003 RCX: ffff888127761cc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffff888136624253 R09: 1ffff11026cc484a
R10: dffffc0000000000 R11: ffffed1026cc484b R12: ffff88810aec9400
R13: ffff88802f536460 R14: ffff88802f536478 R15: dffffc0000000000
FS:  000055556004b500(0000) GS:ffff8881a3c80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3adfc1 CR3: 000000001f0c8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 klist_dec_and_del+0x3c7/0x3d0
 klist_remove+0x1bd/0x340
 device_move+0x193/0x700
 hci_conn_del_sysfs+0xb8/0x170
 hci_conn_del+0x949/0xcf0
 hci_conn_hash_flush+0x191/0x230
 hci_dev_close_sync+0xaef/0x1330
 hci_unregister_dev+0x21a/0x510
 vhci_release+0x80/0xd0
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x22e0
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd8b318ebe9
Code: Unable to access opcode bytes at 0x7fd8b318ebbf.
RSP: 002b:00007ffdb8a85dd8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000001c49a RCX: 00007fd8b318ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fd8b33b7da0 R08: 0000000000000001 R09: 00000015b8a860cf
R10: 0000001b2f820000 R11: 0000000000000246 R12: 00007fd8b33b5fac
R13: 00007fd8b33b5fa0 R14: ffffffffffffffff R15: 00007ffdb8a85ef0
 </TASK>
