------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 144 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 144 Comm: kworker/0:2 Not tainted 5.18.0-rc6-syzkaller-01563-g6e144b47f560 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events sco_sock_timeout RIP: 0010:refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Code: 09 31 ff 89 de e8 77 3c 81 fd 84 db 0f 85 36 ff ff ff e8 8a 38 81 fd 48 c7 c7 00 f3 26 8a c6 05 77 22 ad 09 01 e8 2f af 33 05 <0f> 0b e9 17 ff ff ff e8 6b 38 81 fd 0f b6 1d 5c 22 ad 09 31 ff 89 RSP: 0018:ffffc9000295fcd8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888019431d80 RSI: ffffffff816013d8 RDI: fffff5200052bf8d RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815fbdae R11: 0000000000000000 R12: ffff888026cbf408 R13: ffff888078c20080 R14: ffff888019607000 R15: ffff8880b9c39840 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020034000 CR3: 00000000272fc000 CR4: 00000000003506f0 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:721 [inline] sco_sock_timeout+0x216/0x290 net/bluetooth/sco.c:89 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298