BTRFS info (device loop4): enabling free space tree
BTRFS info (device loop4): force clearing of disk cache
BTRFS info (device loop4): enabling auto defrag
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 7814 Comm: syz.4.268 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
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]
 check_buffer_tree_ref+0x98/0x1bc fs/btrfs/extent_io.c:3045
 alloc_extent_buffer+0x152c/0x237c fs/btrfs/extent_io.c:3438
 btrfs_find_create_tree_block+0x3c/0x50 fs/btrfs/disk-io.c:606
 btrfs_init_new_buffer fs/btrfs/extent-tree.c:5060 [inline]
 btrfs_alloc_tree_block+0x1b4/0xe38 fs/btrfs/extent-tree.c:5173
 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_insert_empty_items+0xa4/0x17c fs/btrfs/ctree.c:4284
 btrfs_insert_empty_item fs/btrfs/ctree.h:667 [inline]
 btrfs_insert_orphan_item+0x12c/0x1a4 fs/btrfs/orphan.c:23
 btrfs_orphan_add+0x70/0x284 fs/btrfs/inode.c:3515
 btrfs_begin_enable_verity+0x1a4/0x28c fs/btrfs/verity.c:608
 enable_verity+0x498/0x15b0 fs/verity/enable.c:235
 fsverity_ioctl_enable+0x3ac/0x420 fs/verity/enable.c:375
 btrfs_ioctl+0xac8/0xc3c fs/btrfs/ioctl.c:5346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:584
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
BTRFS info (device loop4): setting compat-ro feature flag for VERITY (0x4)