BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 8777 Comm: kworker/u4:12 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: btrfs-qgroup-rescan btrfs_work_helper
Call trace:
 dump_backtrace+0x1c0/0x1ec 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+0xf4/0x15c 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+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 find_free_extent_unclustered fs/btrfs/extent-tree.c:3678 [inline]
 do_allocation_clustered fs/btrfs/extent-tree.c:3731 [inline]
 do_allocation fs/btrfs/extent-tree.c:3931 [inline]
 find_free_extent+0x2494/0x4844 fs/btrfs/extent-tree.c:4472
 btrfs_reserve_extent+0x244/0x520 fs/btrfs/extent-tree.c:4621
 btrfs_alloc_tree_block+0x19c/0x1164 fs/btrfs/extent-tree.c:5034
 btrfs_force_cow_block+0x3ac/0x188c fs/btrfs/ctree.c:450
 btrfs_cow_block+0x2d0/0x708 fs/btrfs/ctree.c:623
 btrfs_search_slot+0xa50/0x237c fs/btrfs/ctree.c:-1
 update_qgroup_info_item fs/btrfs/qgroup.c:844 [inline]
 btrfs_run_qgroups+0x320/0x6c0 fs/btrfs/qgroup.c:2880
 commit_cowonly_roots+0x1b8/0x71c fs/btrfs/transaction.c:1304
 btrfs_commit_transaction+0x10e8/0x2884 fs/btrfs/transaction.c:2444
 btrfs_qgroup_rescan_worker+0x14b8/0x152c fs/btrfs/qgroup.c:3423
 btrfs_work_helper+0x324/0xcb0 fs/btrfs/async-thread.c:280
 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292
 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
BTRFS info (device loop1): qgroup scan completed (inconsistency flag cleared)