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: 4800 Comm: kworker/1:3 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+0x141/0x1d7 lib/dump_stack.c:120
 assign_lock_key kernel/locking/lockdep.c:937 [inline]
 register_lock_class+0x1077/0x1180 kernel/locking/lockdep.c:1249
 __lock_acquire+0x102/0x5230 kernel/locking/lockdep.c:4781
 lock_acquire kernel/locking/lockdep.c:5512 [inline]
 lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159
 skb_dequeue+0x1c/0x180 net/core/skbuff.c:3095
 skb_queue_purge+0x21/0x30 net/core/skbuff.c:3133
 l2cap_chan_del+0x5f3/0xa80 net/bluetooth/l2cap_core.c:657
 l2cap_chan_close+0x1bc/0xaf0 net/bluetooth/l2cap_core.c:823
 l2cap_chan_timeout+0x17e/0x2f0 net/bluetooth/l2cap_core.c:436
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
usb 4-1: new high-speed USB device number 4 using dummy_hcd
usb 4-1: config 21 has an invalid descriptor of length 0, skipping remainder of the config
usb 4-1: config 21 has 1 interface, different from the descriptor's value: 2
usb 4-1: config 21 interface 0 altsetting 0 has 0 endpoint descriptors, different from the interface descriptor's value: 1
usb 4-1: New USB device found, idVendor=0535, idProduct=a4a1, bcdDevice=b7.40
usb 4-1: New USB device strings: Mfr=170, Product=36, SerialNumber=232
usb 4-1: Product: syz
usb 4-1: Manufacturer: syz
usb 4-1: SerialNumber: syz
cdc_wdm: probe of 4-1:21.0 failed with error -22
usb 4-1: USB disconnect, device number 4