------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 9988 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0
Modules linked in:
CPU: 0 UID: 0 PID: 9988 Comm: kbnepd bnep0 Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8-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 42 e2 8b e8 f7 7a c2 fc 90 0f 0b 90 90 eb d7 e8 5b d2 fe fc c6 05 1f 8d c9 0a 01 90 48 c7 c7 20 43 e2 8b e8 d7 7a c2 fc 90 <0f> 0b 90 90 eb b7 e8 3b d2 fe fc c6 05 fc 8c c9 0a 01 90 48 c7 c7
RSP: 0018:ffffc90002d0f6a0 EFLAGS: 00010246
RAX: c73a965a36ce8000 RBX: 0000000000000003 RCX: ffff8880373c1cc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffff88804b024293 R09: 1ffff11009604852
R10: dffffc0000000000 R11: ffffed1009604853 R12: dffffc0000000000
R13: ffff8880365e2c60 R14: ffff8880365e2c78 R15: ffffffff85f65f40
FS:  0000000000000000(0000) GS:ffff8880b8650000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcd71a9e28 CR3: 00000001113ca000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 klist_dec_and_del+0x3c7/0x3d0
 klist_del+0xa6/0x110
 device_del+0x280/0x8e0
 unregister_netdevice_many_notify+0x1d52/0x2320
 unregister_netdevice_queue+0x33c/0x380
 unregister_netdev+0x1f/0x60
 bnep_session+0x294d/0x2b40
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
