------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 2 PID: 27 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25
Modules linked in:
CPU: 2 PID: 27 Comm: kworker/2:0 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events sco_sock_timeout
RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25
Code: 09 31 ff 89 de e8 27 e8 9c fd 84 db 0f 85 36 ff ff ff e8 3a e4 9c fd 48 c7 c7 60 d2 04 8a c6 05 b0 e3 a1 09 01 e8 02 da 25 05 <0f> 0b e9 17 ff ff ff e8 1b e4 9c fd 0f b6 1d 95 e3 a1 09 31 ff 89
RSP: 0018:ffffc90000547ce0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888011575700 RSI: ffffffff815f1db8 RDI: fffff520000a8f8e
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff815ebb5e R11: 0000000000000000 R12: ffff8880263a0808
R13: ffff88802530d080 R14: ffff88801145a600 R15: ffff88802cc39280
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020600000 CR3: 00000000687bd000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:199 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 sock_hold include/net/sock.h:708 [inline]
 sco_sock_timeout+0x216/0x290 net/bluetooth/sco.c:89
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>