BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low! turning off the locking correctness validator. CPU: 1 UID: 0 PID: 5064 Comm: kworker/u8:17 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: btrfs-delalloc 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+0x140/0x2e0 kernel/locking/lockdep.c:5868 _raw_spin_lock_nested+0x50/0x6c kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested kernel/sched/core.c:639 [inline] raw_spin_rq_lock kernel/sched/sched.h:1558 [inline] rq_lock kernel/sched/sched.h:1885 [inline] ttwu_queue kernel/sched/core.c:3892 [inline] try_to_wake_up+0x440/0xe24 kernel/sched/core.c:4218 wake_up_process+0x18/0x24 kernel/sched/core.c:4349 kick_pool+0x3e0/0x58c kernel/workqueue.c:1279 __queue_work+0xd90/0x121c kernel/workqueue.c:2336 queue_work_on+0xdc/0x18c kernel/workqueue.c:2386 queue_work include/linux/workqueue.h:669 [inline] btrfs_queue_work+0x23c/0x454 fs/btrfs/async-thread.c:351 btrfs_cache_block_group+0x430/0x66c fs/btrfs/block-group.c:970 find_free_extent+0x3218/0x4f14 fs/btrfs/extent-tree.c:4522 btrfs_reserve_extent+0x210/0x600 fs/btrfs/extent-tree.c:4705 btrfs_alloc_tree_block+0x168/0xe38 fs/btrfs/extent-tree.c:5157 btrfs_force_cow_block+0x404/0x2058 fs/btrfs/ctree.c:517 btrfs_cow_block+0x328/0x940 fs/btrfs/ctree.c:708 btrfs_search_slot+0x96c/0x2228 fs/btrfs/ctree.c:2130 btrfs_lookup_file_extent+0xd8/0x128 fs/btrfs/file-item.c:266 btrfs_drop_extents+0x330/0x245c fs/btrfs/file.c:186 __cow_file_range_inline+0x1f0/0x1174 fs/btrfs/inode.c:643 cow_file_range_inline+0x2a0/0x380 fs/btrfs/inode.c:702 compress_file_range+0x954/0xfc4 fs/btrfs/inode.c:1000 btrfs_work_helper+0x360/0xca8 fs/btrfs/async-thread.c:312 process_one_work+0x7c0/0x1558 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3421 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844