Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning:
------------[ cut here ]------------
lockdep bfs error:-1
WARNING: kernel/locking/lockdep.c:2103 at print_bfs_bug+0x20/0x40 kernel/locking/lockdep.c:2103, CPU#0: kworker/u8:12/1493
Modules linked in:
CPU: 0 UID: 0 PID: 1493 Comm: kworker/u8:12 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: btrfs-endio-write btrfs_work_helper
RIP: 0010:print_bfs_bug+0x22/0x40 kernel/locking/lockdep.c:2103
Code: 90 90 90 90 90 90 90 90 55 53 89 fb e8 17 4f 28 03 89 c5 e8 e0 85 ff ff 85 ed 74 13 83 fb ff 74 16 48 8d 3d 60 d1 12 0e 89 de <67> 48 0f b9 3a 5b 5d e9 82 80 ba 09 cc 48 c7 c7 3f 78 9f 8d e8 b5
RSP: 0018:ffffc900073a6748 EFLAGS: 00010046
RAX: 000000000000003b RBX: 00000000ffffffff RCX: 51a468826b60d100
RDX: 0000000040000000 RSI: 00000000ffffffff RDI: ffffffff8fb53b30
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff52000e74c99 R12: 0000000000000068
R13: ffffffff9353e248 R14: ffffffff9643d458 R15: ffffffff9643d538
FS:  0000000000000000(0000) GS:ffff888125bc2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f69bf5000 CR3: 00000000605e8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 check_irq_usage kernel/locking/lockdep.c:-1 [inline]
 check_prev_add kernel/locking/lockdep.c:3213 [inline]
 check_prevs_add kernel/locking/lockdep.c:3328 [inline]
 validate_chain kernel/locking/lockdep.c:3952 [inline]
 __lock_acquire+0x25ed/0x2de0 kernel/locking/lockdep.c:5288
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:73
 ktime_get+0x45/0x220 kernel/time/timekeeping.c:1002
 hrtick_schedule_exit kernel/sched/core.c:1010 [inline]
 finish_lock_switch kernel/sched/core.c:5263 [inline]
 finish_task_switch+0x303/0xc60 kernel/sched/core.c:5382
 context_switch kernel/sched/core.c:5536 [inline]
 __schedule+0x16e1/0x5700 kernel/sched/core.c:7284
 preempt_schedule_common+0x7f/0xd0 kernel/sched/core.c:7463
 preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
 _raw_spin_unlock_irqrestore+0x76/0x80 kernel/locking/spinlock.c:221
 rcu_report_qs_rsp+0xaf/0x1f0 kernel/rcu/tree.c:2354
 rcu_report_unblock_qs_rnp kernel/rcu/tree.c:2459 [inline]
 rcu_preempt_deferred_qs_irqrestore+0x911/0xb90 kernel/rcu/tree_plugin.h:571
 __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438
 spin_unlock include/linux/spinlock_rt.h:115 [inline]
 btrfs_block_rsv_size fs/btrfs/block-rsv.h:140 [inline]
 btrfs_use_block_rsv+0x1df/0x940 fs/btrfs/block-rsv.c:524
 btrfs_alloc_tree_block+0x1a0/0x1170 fs/btrfs/extent-tree.c:5371
 btrfs_force_cow_block+0x562/0x1bf0 fs/btrfs/ctree.c:501
 btrfs_cow_block+0x3f1/0xaf0 fs/btrfs/ctree.c:696
 btrfs_search_slot+0xd76/0x2d20 fs/btrfs/ctree.c:-1
 btrfs_lookup_csum+0x14a/0x4a0 fs/btrfs/file-item.c:217
 btrfs_insert_data_csums+0x296/0x1c40 fs/btrfs/file-item.c:1158
 add_pending_csums fs/btrfs/inode.c:2762 [inline]
 btrfs_finish_one_ordered+0x13f3/0x1f10 fs/btrfs/inode.c:3345
 btrfs_work_helper+0x338/0xc30 fs/btrfs/async-thread.c:312
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	55                   	push   %rbp
   9:	53                   	push   %rbx
   a:	89 fb                	mov    %edi,%ebx
   c:	e8 17 4f 28 03       	call   0x3284f28
  11:	89 c5                	mov    %eax,%ebp
  13:	e8 e0 85 ff ff       	call   0xffff85f8
  18:	85 ed                	test   %ebp,%ebp
  1a:	74 13                	je     0x2f
  1c:	83 fb ff             	cmp    $0xffffffff,%ebx
  1f:	74 16                	je     0x37
  21:	48 8d 3d 60 d1 12 0e 	lea    0xe12d160(%rip),%rdi        # 0xe12d188
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	5b                   	pop    %rbx
  30:	5d                   	pop    %rbp
  31:	e9 82 80 ba 09       	jmp    0x9ba80b8
  36:	cc                   	int3
  37:	48 c7 c7 3f 78 9f 8d 	mov    $0xffffffff8d9f783f,%rdi
  3e:	e8                   	.byte 0xe8
  3f:	b5                   	.byte 0xb5