BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 6319 Comm: syz.0.338 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 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+0x1b40/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 local_lock_acquire+0x3c/0x98 include/linux/local_lock_internal.h:29
 put_cpu_partial+0x68/0x1fc mm/slub.c:2639
 get_partial_node+0x308/0x3b8 mm/slub.c:2239
 get_partial mm/slub.c:2330 [inline]
 ___slab_alloc+0x690/0xec8 mm/slub.c:3131
 __slab_alloc+0x74/0xd0 mm/slub.c:3240
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x298/0x320 mm/slub.c:3398
 kmalloc_trace+0x48/0x94 mm/slab_common.c:1026
 kmalloc include/linux/slab.h:563 [inline]
 btrfs_ref_tree_mod+0x240/0x128c fs/btrfs/ref-verify.c:691
 btrfs_alloc_tree_block+0xb8c/0x1158 fs/btrfs/extent-tree.c:5070
 btrfs_force_cow_block+0x3a0/0x187c fs/btrfs/ctree.c:450
 btrfs_cow_block+0x2d0/0x710 fs/btrfs/ctree.c:623
 btrfs_search_slot+0xa54/0x2364 fs/btrfs/ctree.c:2087
 btrfs_insert_empty_items+0xa4/0x178 fs/btrfs/ctree.c:4185
 btrfs_insert_empty_item fs/btrfs/ctree.h:3137 [inline]
 insert_with_overflow+0xf4/0x2ec fs/btrfs/dir-item.c:32
 btrfs_insert_dir_item+0x184/0x474 fs/btrfs/dir-item.c:132
 create_pending_snapshot+0xa20/0x207c fs/btrfs/transaction.c:1841
 create_pending_snapshots+0x150/0x198 fs/btrfs/transaction.c:1906
 btrfs_commit_transaction+0xf70/0x29f0 fs/btrfs/transaction.c:2374
 create_snapshot+0x4ec/0x838 fs/btrfs/ioctl.c:856
 btrfs_mksubvol+0x554/0x6bc fs/btrfs/ioctl.c:1008
 btrfs_mksnapshot+0xc4/0x154 fs/btrfs/ioctl.c:1054
 __btrfs_ioctl_snap_create+0x310/0x3f8 fs/btrfs/ioctl.c:2218
 btrfs_ioctl_snap_create_v2+0x1a4/0x38c fs/btrfs/ioctl.c:2305
 btrfs_ioctl+0xa88/0xbd0 fs/btrfs/ioctl.c:-1
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585