------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 9765 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 9765 Comm: kbnepd bnep0 Not tainted 6.16.0-rc6-syzkaller-01646-g56613001dfc9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28
Code: c0 41 e2 8b e8 57 c3 c3 fc 90 0f 0b 90 90 eb d7 e8 5b d7 ff fc c6 05 fa c3 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 d7 c3 cb 0a 01 90 48 c7 c7
RSP: 0018:ffffc90003b77700 EFLAGS: 00010246
RAX: c08178049cfdb600 RBX: 0000000000000003 RCX: ffff888054f65a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfaa6c R12: dffffc0000000000
R13: ffff888058d3e060 R14: ffff888058d3e078 R15: ffffffff85f562c0
FS:  0000000000000000(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd46f45bf98 CR3: 000000001b6f6000 CR4: 00000000003526f0
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+0x3c7/0x3d0 lib/klist.c:206
 klist_put lib/klist.c:217 [inline]
 klist_del+0xa6/0x110 lib/klist.c:230
 device_del+0x280/0x8e0 drivers/base/core.c:3858
 unregister_netdevice_many_notify+0x1a6b/0x1ff0 net/core/dev.c:12175
 unregister_netdevice_many net/core/dev.c:12203 [inline]
 unregister_netdevice_queue+0x33c/0x380 net/core/dev.c:12047
 unregister_netdevice include/linux/netdevice.h:3382 [inline]
 unregister_netdev+0x1f/0x60 net/core/dev.c:12221
 bnep_session+0x294d/0x2b40 net/bluetooth/bnep/core.c:525
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>