BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 11699 Comm: syz-executor Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 lookup_chain_cache_add kernel/locking/lockdep.c:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1b88/0x7680 kernel/locking/lockdep.c:5049
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb4 kernel/locking/spinlock.c:162
 __stack_depot_save+0x220/0x4e0 lib/stackdepot.c:479
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x64/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674
 kfree+0xcc/0x1b8 mm/slab_common.c:988
 btrfs_ref_tree_mod+0xda4/0x13cc fs/btrfs/ref-verify.c:808
 btrfs_free_tree_block+0x2fc/0xb50 fs/btrfs/extent-tree.c:3282
 btrfs_force_cow_block+0xcc8/0x1b48 fs/btrfs/ctree.c:520
 btrfs_cow_block+0x2e8/0x71c fs/btrfs/ctree.c:616
 btrfs_search_slot+0xb64/0x2928 fs/btrfs/ctree.c:2080
 btrfs_insert_empty_items+0xa4/0x178 fs/btrfs/ctree.c:4178
 btrfs_insert_delayed_item fs/btrfs/delayed-inode.c:743 [inline]
 btrfs_insert_delayed_items fs/btrfs/delayed-inode.c:821 [inline]
 __btrfs_commit_inode_delayed_items+0xa34/0x1c5c fs/btrfs/delayed-inode.c:1108
 __btrfs_run_delayed_items+0x1bc/0x450 fs/btrfs/delayed-inode.c:1153
 btrfs_run_delayed_items+0x24/0x34 fs/btrfs/delayed-inode.c:1190
 btrfs_commit_transaction+0x950/0x2cd4 fs/btrfs/transaction.c:2287
 btrfs_sync_fs+0x55c/0xb6c fs/btrfs/super.c:1535
 sync_filesystem+0x1a0/0x218 fs/sync.c:66
 generic_shutdown_super+0x70/0x328 fs/super.c:474
 kill_anon_super+0x4c/0x74 fs/super.c:1128
 btrfs_kill_super+0x40/0x58 fs/btrfs/super.c:2449
 deactivate_locked_super+0xac/0x124 fs/super.c:332
 deactivate_super+0xf0/0x110 fs/super.c:363
 cleanup_mnt+0x394/0x41c fs/namespace.c:1186
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193
 task_work_run+0x240/0x2f0 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x2080/0x2cb8 arch/arm64/kernel/signal.c:1132
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
BTRFS info (device loop6): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d