Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning:
------------[ cut here ]------------
lockdep bfs error:-1
WARNING: CPU: 1 PID: 6588 at kernel/locking/lockdep.c:2090 print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2090
Modules linked in:
CPU: 1 UID: 0 PID: 6588 Comm: kworker/u9:6 Not tainted 6.12.0-rc6-syzkaller-00166-g55d42a0c3f9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: hci4 hci_cmd_sync_work
RIP: 0010:print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2090
Code: 90 55 53 89 fb e8 87 e1 48 03 89 c5 e8 80 15 ff ff 85 ed 74 19 83 fb ff 74 1b 90 48 c7 c7 80 e2 0a 8c 89 de e8 58 e8 e4 ff 90 <0f> 0b 90 90 5b 5d c3 cc cc cc cc 48 c7 c7 20 e2 0a 8c e8 d0 4f 53
RSP: 0018:ffffc9000382efc8 EFLAGS: 00010046
RAX: 6d25477f223a3700 RBX: 00000000ffffffff RCX: ffff88802e319e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8155d312 R09: 1ffff110170e519a
R10: dffffc0000000000 R11: ffffed10170e519b R12: dffffc0000000001
R13: ffffffff96d23958 R14: ffffffff93cbd678 R15: ffffffff96d23878
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000034228000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 check_irq_usage kernel/locking/lockdep.c:2829 [inline]
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x4809/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 __free_object+0x47c/0xa80 lib/debugobjects.c:370
 __debug_check_no_obj_freed lib/debugobjects.c:994 [inline]
 debug_check_no_obj_freed+0x293/0x580 lib/debugobjects.c:1019
 slab_free_hook mm/slub.c:2273 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x11f/0x440 mm/slub.c:4727
 device_release+0x99/0x1c0
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22f/0x480 lib/kobject.c:737
 hci_conn_cleanup net/bluetooth/hci_conn.c:174 [inline]
 hci_conn_del+0x8c4/0xc40 net/bluetooth/hci_conn.c:1163
 hci_abort_conn_sync+0x583/0xe00 net/bluetooth/hci_sync.c:5596
 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:332
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>