------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 5838 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0
Modules linked in:
CPU: 1 UID: 0 PID: 5838 Comm: syz-executor Not tainted 6.16.0-rc6-syzkaller-01577-gdd500e4aecf2-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: c0 41 e2 8b e8 57 c3 c3 fc 90 0f 0b 90 90 eb d7 e8 5b d7 ff fc c6 05 7a c2 cb 0a 01 90 48 c7 c7 20 42 e2 8b e8 37 c3 c3 fc 90 <0f> 0b 90 90 eb b7 e8 3b d7 ff fc c6 05 57 c2 cb 0a 01 90 48 c7 c7
RSP: 0018:ffffc9000339f7d8 EFLAGS: 00010246
RAX: 90a5433d7d540600 RBX: 0000000000000003 RCX: ffff888021995640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffff888136624293 R09: 1ffff11026cc4852
R10: dffffc0000000000 R11: ffffed1026cc4853 R12: ffff888123dc9c00
R13: ffff888111fd1060 R14: ffff888111fd1078 R15: dffffc0000000000
FS:  000055558b26c500(0000) GS:ffff8881a3c16000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d0755c440 CR3: 000000010e8bc000 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+0x8ff/0xcb0
 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
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21ba/0x21c0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f179978e9a9
Code: Unable to access opcode bytes at 0x7f179978e97f.
RSP: 002b:00007fff40ebd938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f179981254f RCX: 00007f179978e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f1799812561 R08: 00007fff40ebb6d7 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006
R13: 00000000000927c0 R14: 0000000000027116 R15: 00007fff40ebdae0
 </TASK>
