Warning: Permanently added '10.128.0.144' (ED25519) to the list of known hosts. executing program [ 39.728239][ T4023] [ 39.728895][ T4023] ===================================== [ 39.730392][ T4023] WARNING: bad unlock balance detected! [ 39.731858][ T4023] 5.15.179-syzkaller #0 Not tainted [ 39.733178][ T4023] ------------------------------------- [ 39.734858][ T4023] kworker/u5:2/4023 is trying to release lock (&chan->lock) at: [ 39.737090][ T4023] [] l2cap_recv_frame+0xf60/0x6c28 [ 39.739053][ T4023] but there are no more locks to release! [ 39.740919][ T4023] [ 39.740919][ T4023] other info that might help us debug this: [ 39.743332][ T4023] 2 locks held by kworker/u5:2/4023: [ 39.744939][ T4023] #0: ffff0000cabe3938 ((wq_completion)hci0#2){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 [ 39.748097][ T4023] #1: ffff80001f9d7c00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 [ 39.751237][ T4023] [ 39.751237][ T4023] stack backtrace: [ 39.752832][ T4023] CPU: 1 PID: 4023 Comm: kworker/u5:2 Not tainted 5.15.179-syzkaller #0 [ 39.755058][ T4023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 [ 39.757942][ T4023] Workqueue: hci0 hci_rx_work [ 39.759302][ T4023] Call trace: [ 39.760419][ T4023] dump_backtrace+0x0/0x530 [ 39.761961][ T4023] show_stack+0x2c/0x3c [ 39.763299][ T4023] dump_stack_lvl+0x108/0x170 [ 39.764661][ T4023] dump_stack+0x1c/0x58 [ 39.766021][ T4023] print_unlock_imbalance_bug+0x250/0x2a4 [ 39.767632][ T4023] lock_release+0x4b8/0xa1c [ 39.769149][ T4023] __mutex_unlock_slowpath+0xe0/0x6d4 [ 39.770744][ T4023] mutex_unlock+0x8c/0xe0 [ 39.771939][ T4023] l2cap_recv_frame+0xf60/0x6c28 [ 39.773277][ T4023] l2cap_recv_acldata+0x4f4/0x163c [ 39.774737][ T4023] hci_rx_work+0x3a8/0x830 [ 39.775968][ T4023] process_one_work+0x790/0x11b8 [ 39.777545][ T4023] worker_thread+0x910/0x1034 [ 39.778809][ T4023] kthread+0x37c/0x45c [ 39.779959][ T4023] ret_from_fork+0x10/0x20