===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- kworker/u5:7/4205 is trying to release lock (&chan->lock) at: [] l2cap_recv_frame+0x115c/0x90d0 net/bluetooth/l2cap_core.c:-1 but there are no more locks to release! other info that might help us debug this: 2 locks held by kworker/u5:7/4205: #0: ffff8880732a5138 ((wq_completion)hci3#2){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1 #1: ffffc90002fcfd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285 stack backtrace: CPU: 1 PID: 4205 Comm: kworker/u5:7 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: hci3 hci_rx_work Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 __lock_release kernel/locking/lockdep.c:5302 [inline] lock_release+0x538/0x8a0 kernel/locking/lockdep.c:5643 __mutex_unlock_slowpath+0xc8/0x6c0 kernel/locking/mutex.c:851 l2cap_recv_frame+0x115c/0x90d0 net/bluetooth/l2cap_core.c:-1 hci_acldata_packet net/bluetooth/hci_core.c:5003 [inline] hci_rx_work+0x4a4/0xa10 net/bluetooth/hci_core.c:5195 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287