BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 UID: 0 PID: 6144 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: hci1 hci_power_on Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 add_chain_cache kernel/locking/lockdep.c:-1 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0xf9c/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 skb_queue_tail+0x34/0xfc net/core/skbuff.c:4036 hci_cmd_sync_add net/bluetooth/hci_sync.c:112 [inline] __hci_cmd_sync_sk+0x1fc/0x9c0 net/bluetooth/hci_sync.c:168 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:263 [inline] __hci_cmd_sync_status net/bluetooth/hci_sync.c:287 [inline] hci_reset_sync+0x5c/0x16c net/bluetooth/hci_sync.c:3659 hci_init1_sync net/bluetooth/hci_sync.c:3745 [inline] hci_init_sync net/bluetooth/hci_sync.c:4862 [inline] hci_dev_init_sync net/bluetooth/hci_sync.c:5054 [inline] hci_dev_open_sync+0x9d4/0x2cd8 net/bluetooth/hci_sync.c:5132 hci_dev_do_open net/bluetooth/hci_core.c:430 [inline] hci_power_on+0x14c/0x628 net/bluetooth/hci_core.c:959 process_one_work+0x7e8/0x155c kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3427 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Bluetooth: hci4: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci2: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci2: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci2: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci2: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci2: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci3: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci3: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci3: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci1: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci1: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci1: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci1: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci1: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci0: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci3: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci3: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci3: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci3: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci0: command tx timeout