------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 0 PID: 9 at lib/refcount.c:25 refcount_warn_saturate+0x1ca/0x210 lib/refcount.c:25
Modules linked in:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.12.0-rc3-syzkaller-00420-g715ca9dd687f #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events sco_sock_timeout
RIP: 0010:refcount_warn_saturate+0x1ca/0x210 lib/refcount.c:25
Code: ff 89 de e8 a8 a0 03 fd 84 db 0f 85 e6 fe ff ff e8 bb 9e 03 fd c6 05 f3 89 7c 0b 01 90 48 c7 c7 00 e2 b0 8b e8 f7 1b c5 fc 90 <0f> 0b 90 90 e9 c3 fe ff ff e8 98 9e 03 fd c6 05 ce 89 7c 0b 01 90
RSP: 0018:ffffc900003b7c90 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff814e38b9
RDX: ffff88801d2bc880 RSI: ffffffff814e38c6 RDI: 0000000000000001
RBP: ffff8880223ad080 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000317008
R13: ffff8880223ad080 R14: 0000000000000001 R15: ffffc900003b7d80
FS:  0000000000000000(0000) GS:ffff88802b400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f73e6108 CR3: 000000006efde000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000e08e000c DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:190 [inline]
 __refcount_inc include/linux/refcount.h:241 [inline]
 refcount_inc include/linux/refcount.h:258 [inline]
 sock_hold include/net/sock.h:781 [inline]
 sco_sock_timeout+0x28a/0x2c0 net/bluetooth/sco.c:92
 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>