Bluetooth: Unexpected continuation frame (len 18) ===================================== WARNING: bad unlock balance detected! 6.1.25-syzkaller #0 Not tainted ------------------------------------- kworker/u5:0/47 is trying to release lock (&conn->chan_lock) at: [] 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/u5:0/47: #0: ffff0000cb30d138 ((wq_completion)hci1#2){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2262 #1: ffff80001c077c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2264 stack backtrace: CPU: 0 PID: 47 Comm: kworker/u5:0 Not tainted 6.1.25-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: hci1 hci_rx_work Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_unlock_imbalance_bug+0x250/0x2a4 kernel/locking/lockdep.c:5109 lock_release+0x4dc/0xa50 kernel/locking/lockdep.c:5689 __mutex_unlock_slowpath+0xe0/0x6cc kernel/locking/mutex.c:907 mutex_unlock+0x24/0x30 kernel/locking/mutex.c:543 l2cap_disconnect_rsp+0x210/0x30c net/bluetooth/l2cap_core.c:4697 l2cap_le_sig_cmd net/bluetooth/l2cap_core.c:6426 [inline] l2cap_le_sig_channel net/bluetooth/l2cap_core.c:6464 [inline] l2cap_recv_frame+0x18b4/0x6a14 net/bluetooth/l2cap_core.c:7796 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+0x7ac/0x1404 kernel/workqueue.c:2289 worker_thread+0x8e4/0xfec kernel/workqueue.c:2436 kthread+0x24c/0x2d4 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: Unexpected continuation frame (len 18) Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout