BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 UID: 0 PID: 5098 Comm: kworker/u8:9 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Workqueue: btrfs-qgroup-rescan btrfs_work_helper Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 add_chain_cache kernel/locking/lockdep.c:-1 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:3855 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0xf9c/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] btrfs_add_reserved_bytes+0x6c/0x7b8 fs/btrfs/block-group.c:3807 find_free_extent+0x37d0/0x4f94 fs/btrfs/extent-tree.c:4587 btrfs_reserve_extent+0x22c/0x624 fs/btrfs/extent-tree.c:4715 btrfs_alloc_tree_block+0x178/0xe5c fs/btrfs/extent-tree.c:5168 btrfs_force_cow_block+0x404/0x2044 fs/btrfs/ctree.c:517 btrfs_cow_block+0x3d4/0x934 fs/btrfs/ctree.c:699 btrfs_search_slot+0x9ec/0x2268 fs/btrfs/ctree.c:2097 btrfs_search_prev_slot fs/btrfs/free-space-tree.c:136 [inline] remove_free_space_extent fs/btrfs/free-space-tree.c:732 [inline] __btrfs_remove_from_free_space_tree fs/btrfs/free-space-tree.c:837 [inline] btrfs_remove_from_free_space_tree+0x45c/0xcc8 fs/btrfs/free-space-tree.c:866 alloc_reserved_extent+0x5c/0x36c fs/btrfs/extent-tree.c:4788 alloc_reserved_tree_block fs/btrfs/extent-tree.c:4949 [inline] run_delayed_tree_ref fs/btrfs/extent-tree.c:1743 [inline] run_one_delayed_ref fs/btrfs/extent-tree.c:1775 [inline] btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1972 [inline] __btrfs_run_delayed_refs+0x1538/0x377c fs/btrfs/extent-tree.c:2047 btrfs_run_delayed_refs+0xc4/0x394 fs/btrfs/extent-tree.c:2159 commit_cowonly_roots+0x524/0x6fc fs/btrfs/transaction.c:1378 btrfs_commit_transaction+0x10d0/0x2ce4 fs/btrfs/transaction.c:2462 btrfs_qgroup_rescan_worker+0x12c8/0x19f8 fs/btrfs/qgroup.c:3831 btrfs_work_helper+0x380/0xca8 fs/btrfs/async-thread.c:312 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3400 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 BTRFS info (device loop5): qgroup scan completed (inconsistency flag cleared)