syzbot has found a reproducer for the following issue on: HEAD commit: 14f8db1c0f9a Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=13b18ef8280000 kernel config: https://syzkaller.appspot.com/x/.config?x=a837a8ba7e88bb45 dashboard link: https://syzkaller.appspot.com/bug?extid=180f35f8e76c7af067d2 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167c5f2c280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1430f330280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ad6ce516eed3/disk-14f8db1c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1f38c2cc7667/vmlinux-14f8db1c.xz kernel image: https://storage.googleapis.com/syzbot-assets/d795115eee39/Image-14f8db1c.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+180f35f8e76c7af067d2@xxxxxxxxxxxxxxxxxxxxxxxxx Bluetooth: hci0: unexpected cc 0x0c25 length: 249 > 3 Bluetooth: hci0: unexpected cc 0x0c38 length: 249 > 2 ===================================== WARNING: bad unlock balance detected! 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted ------------------------------------- kworker/u5:2/5929 is trying to release lock (&conn->chan_lock) at: [<ffff8000115d5e64>] l2cap_disconnect_rsp+0x210/0x30c net/bluetooth/l2cap_core.c:4697 but there are no more locks to release! other info that might help us debug this: 2 locks held by kworker/u5:2/5929: #0: ffff0000db5a5938 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x664/0x12d4 kernel/workqueue.c:2363 #1: ffff80001e507c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x12d4 kernel/workqueue.c:2365 stack backtrace: CPU: 1 PID: 5929 Comm: kworker/u5:2 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: hci0 hci_rx_work Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_unlock_imbalance_bug+0x250/0x2a4 kernel/locking/lockdep.c:5109 lock_release+0x4ac/0x9ac kernel/locking/lockdep.c:5689 __mutex_unlock_slowpath+0xe0/0x6b4 kernel/locking/mutex.c:907 mutex_unlock+0x18/0x24 kernel/locking/mutex.c:543 l2cap_disconnect_rsp+0x210/0x30c net/bluetooth/l2cap_core.c:4697 l2cap_bredr_sig_cmd+0x974/0x7e94 net/bluetooth/l2cap_core.c:5748 l2cap_sig_channel net/bluetooth/l2cap_core.c:6507 [inline] l2cap_recv_frame+0x83c/0x6a14 net/bluetooth/l2cap_core.c:7786 l2cap_recv_acldata+0x4f4/0x163c net/bluetooth/l2cap_core.c:8504 hci_acldata_packet net/bluetooth/hci_core.c:3828 [inline] hci_rx_work+0x2cc/0x8b8 net/bluetooth/hci_core.c:4063 process_one_work+0x788/0x12d4 kernel/workqueue.c:2390 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2537 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
