BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 4439 Comm: kworker/u4:7 Not tainted 6.1.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: btrfs-endio-write btrfs_work_helper
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1b40/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 down_read+0x64/0x304 kernel/locking/rwsem.c:1520
 find_free_extent+0x1338/0x46b0 fs/btrfs/extent-tree.c:4396
 btrfs_reserve_extent+0x230/0x4fc fs/btrfs/extent-tree.c:4619
 btrfs_alloc_tree_block+0x190/0x1158 fs/btrfs/extent-tree.c:5032
 btrfs_force_cow_block+0x3a0/0x187c fs/btrfs/ctree.c:443
 btrfs_cow_block+0x2d0/0x710 fs/btrfs/ctree.c:616
 btrfs_search_slot+0xa54/0x2364 fs/btrfs/ctree.c:2080
 btrfs_lookup_file_extent+0xd8/0x128 fs/btrfs/file-item.c:253
 btrfs_drop_extents+0x348/0x2268 fs/btrfs/file.c:243
 insert_reserved_file_extent+0x254/0x7ac fs/btrfs/inode.c:3087
 insert_ordered_extent_file_extent fs/btrfs/inode.c:3194 [inline]
 btrfs_finish_ordered_io+0x984/0x162c fs/btrfs/inode.c:3306
 finish_ordered_fn+0x20/0x30 fs/btrfs/ordered-data.c:281
 btrfs_work_helper+0x30c/0xccc fs/btrfs/async-thread.c:280
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849