------------[ 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 5.15.0-rc5-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 b7 66 9c fd 84 db 0f 85 36 ff ff ff e8 6a 60 9c fd 48 c7 c7 40 ec e3 89 c6 05 31 85 7f 09 01 e8 f3 19 19 05 <0f> 0b e9 17 ff ff ff e8 4b 60 9c fd 0f b6 1d 16 85 7f 09 31 ff 89
RSP: 0018:ffffc90000547ce0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880116e5580 RSI: ffffffff815e88a8 RDI: fffff520000a8f8e
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff815e264e R11: 0000000000000000 R12: ffff888052911c08
R13: ffff888019147080 R14: ffff888011601300 R15: ffff88802cc31240
FS:  0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f387fdad418 CR3: 000000005e265000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __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:705 [inline]
 sco_sock_timeout+0x216/0x290 net/bluetooth/sco.c:88
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295