Hello, syzbot found the following issue on: HEAD commit: 29ce8f970107 Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=12f40133300000 kernel config: https://syzkaller.appspot.com/x/.config?x=d2f9d4c9ff8c5ae7 dashboard link: https://syzkaller.appspot.com/bug?extid=0d58aed5b04e25a9b5a7 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0d58aed5b04e25a9b5a7@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 10451 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 10451 Comm: kworker/0:8 Not tainted 5.14.0-rc7-syzkaller #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 d7 c9 9e fd 84 db 0f 85 36 ff ff ff e8 8a c3 9e fd 48 c7 c7 20 8f e3 89 c6 05 e8 7f 81 09 01 e8 f0 98 16 05 <0f> 0b e9 17 ff ff ff e8 6b c3 9e fd 0f b6 1d cd 7f 81 09 31 ff 89 RSP: 0018:ffffc9001766fce8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88802cea3880 RSI: ffffffff815d87a5 RDI: fffff52002ecdf8f RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d25de R11: 0000000000000000 R12: ffff88806d23ce08 R13: ffff8880712c8080 R14: ffff88802edf4500 R15: ffff8880b9c51240 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3748c20000 CR3: 0000000017644000 CR4: 00000000001506f0 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:702 [inline] sco_sock_timeout+0x216/0x290 net/bluetooth/sco.c:88 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
