Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning:
------------[ cut here ]------------
lockdep bfs error:-1
WARNING: CPU: 1 PID: 986 at kernel/locking/lockdep.c:2059 print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2059
Modules linked in:
CPU: 1 UID: 0 PID: 986 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
RIP: 0010:print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2059
Code: 90 55 53 89 fb e8 07 67 18 03 89 c5 e8 00 a6 ff ff 85 ed 74 19 83 fb ff 74 1c 90 48 c7 c7 99 e0 04 8d 89 de e8 18 fe e6 ff 90 <0f> 0b 90 90 5b 5d c3 cc cc cc cc cc 48 c7 c7 0f 88 16 8d e8 8f 0f
RSP: 0018:ffffc900042d7070 EFLAGS: 00010046
RAX: 9de50a7d4bbe5f00 RBX: 00000000ffffffff RCX: ffff8880257a0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1017124863 R12: ffffffff95a60dd8
R13: ffffffff95a60e48 R14: ffff8880257a0b98 R15: 0000000000000028
FS:  0000000000000000(0000) GS:ffff8881269bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0095c1000 CR3: 0000000039d44000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 check_irq_usage kernel/locking/lockdep.c:-1 [inline]
 check_prev_add kernel/locking/lockdep.c:3169 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain+0x1a4b/0x2140 kernel/locking/lockdep.c:3908
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 _raw_spin_lock_nested+0x32/0x50 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:636
 raw_spin_rq_lock kernel/sched/sched.h:1519 [inline]
 task_rq_lock+0xbc/0x470 kernel/sched/core.c:736
 __set_cpus_allowed_ptr kernel/sched/core.c:3182 [inline]
 migrate_enable+0x12a/0x3c0 kernel/sched/core.c:2433
 __local_bh_enable+0x23f/0x3d0 kernel/softirq.c:214
 __local_bh_enable_ip+0x1a4/0x270 kernel/softirq.c:262
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline]
 __dev_queue_xmit+0x1d3d/0x3b70 net/core/dev.c:4752
 dev_queue_xmit include/linux/netdevice.h:3361 [inline]
 batadv_send_skb_packet+0x44f/0x6d0 net/batman-adv/send.c:107
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x62f/0x7e0 net/batman-adv/bat_iv_ogm.c:1702
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>