BTRFS info (device loop2): rebuilding free space tree
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 8527 Comm: syz.2.249 Not tainted 6.16.0-rc6-syzkaller-gaaef6f251176 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:3858 [inline]
 validate_chain kernel/locking/lockdep.c:3879 [inline]
 __lock_acquire+0xf9c/0x30a4 kernel/locking/lockdep.c:5240
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
 __debug_check_no_obj_freed lib/debugobjects.c:1088 [inline]
 debug_check_no_obj_freed+0x148/0x470 lib/debugobjects.c:1129
 slab_free_hook mm/slub.c:2312 [inline]
 slab_free mm/slub.c:4643 [inline]
 kmem_cache_free+0x124/0x550 mm/slub.c:4745
 btrfs_find_space_for_alloc+0xaf4/0xc54 fs/btrfs/free-space-cache.c:3131
 find_free_extent_unclustered fs/btrfs/extent-tree.c:3784 [inline]
 do_allocation_clustered fs/btrfs/extent-tree.c:3807 [inline]
 do_allocation fs/btrfs/extent-tree.c:4009 [inline]
 find_free_extent+0x345c/0x4c00 fs/btrfs/extent-tree.c:4557
 btrfs_reserve_extent+0x228/0x4f0 fs/btrfs/extent-tree.c:4712
 btrfs_alloc_tree_block+0x180/0xeb0 fs/btrfs/extent-tree.c:5165
 split_leaf+0x894/0xfb0 fs/btrfs/ctree.c:3752
 search_leaf fs/btrfs/ctree.c:1933 [inline]
 btrfs_search_slot+0x1bdc/0x221c fs/btrfs/ctree.c:2124
 btrfs_insert_empty_items fs/btrfs/ctree.c:4287 [inline]
 btrfs_insert_empty_item fs/btrfs/ctree.h:673 [inline]
 btrfs_insert_item+0x100/0x290 fs/btrfs/ctree.c:4316
 btrfs_insert_root+0xa4/0x14c fs/btrfs/root-tree.c:212
 create_pending_snapshot+0xa14/0x23b8 fs/btrfs/transaction.c:1812
 create_pending_snapshots+0x150/0x198 fs/btrfs/transaction.c:1925
 btrfs_commit_transaction+0xfec/0x2b44 fs/btrfs/transaction.c:2410
 create_snapshot+0x4f4/0x834 fs/btrfs/ioctl.c:782
 btrfs_mksubvol+0x44c/0x59c fs/btrfs/ioctl.c:936
 btrfs_mksnapshot+0xc0/0x150 fs/btrfs/ioctl.c:980
 __btrfs_ioctl_snap_create+0x310/0x3f0 fs/btrfs/ioctl.c:1245
 btrfs_ioctl_snap_create+0x138/0x178 fs/btrfs/ioctl.c:1273
 btrfs_ioctl+0x4b0/0xc3c fs/btrfs/ioctl.c:-1
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 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+0x58/0x180 arch/arm64/kernel/entry-common.c:879
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
BTRFS info (device loop2): last unmount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d