INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 1 PID: 20 Comm: kworker/1:0 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x202/0x31e lib/dump_stack.c:120 register_lock_class+0xedb/0x1490 kernel/locking/lockdep.c:936 __lock_acquire+0x186/0x6040 kernel/locking/lockdep.c:4781 lock_acquire+0x17f/0x720 kernel/locking/lockdep.c:5512 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159 skb_dequeue net/core/skbuff.c:3095 [inline] skb_queue_purge+0x2e/0x1c0 net/core/skbuff.c:3133 l2cap_chan_timeout+0x12c/0x280 net/bluetooth/l2cap_core.c:436 process_one_work+0x833/0x10c0 kernel/workqueue.c:2275 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421 kthread+0x39a/0x3c0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 usb 1-1: new high-speed USB device number 37 using dummy_hcd usb 1-1: Using ep0 maxpacket: 8 usb 1-1: New USB device found, idVendor=1d19, idProduct=1104, bcdDevice=5e.f7 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? usb 1-1: dvb_usb_v2: found a 'MSI DIGIVOX Micro HD' in warm state dvb_usb_rtl28xxu: probe of 1-1:0.0 failed with error -71 usb 1-1: USB disconnect, device number 37