BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 0 PID: 9176 Comm: syz.0.1146 Not tainted 6.1.148-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
 _raw_spin_lock_nested+0x5c/0x78 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested kernel/sched/core.c:537 [inline]
 raw_spin_rq_lock kernel/sched/sched.h:1355 [inline]
 rq_lock kernel/sched/sched.h:1645 [inline]
 __schedule+0x2b8/0x1b18 kernel/sched/core.c:6477
 preempt_schedule_common+0xec/0x1a0 kernel/sched/core.c:6730
 preempt_schedule+0x64/0x84 kernel/sched/core.c:6754
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x80/0x84 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 btrfs_update_delayed_refs_rsv fs/btrfs/delayed-ref.c:136 [inline]
 btrfs_add_delayed_tree_ref+0x7a4/0xcd0 fs/btrfs/delayed-ref.c:980
 btrfs_alloc_tree_block+0xb9c/0x1158 fs/btrfs/extent-tree.c:5071
 btrfs_force_cow_block+0x3a0/0x187c fs/btrfs/ctree.c:443
 btrfs_cow_block+0x2d0/0x710 fs/btrfs/ctree.c:616
 push_leaf_right+0x200/0x5b8 fs/btrfs/ctree.c:3167
 split_leaf+0x2ac/0x1074 fs/btrfs/ctree.c:3585
 search_leaf fs/btrfs/ctree.c:1925 [inline]
 btrfs_search_slot+0x1d90/0x2364 fs/btrfs/ctree.c:2116
 lookup_inline_extent_backref+0x28c/0xe78 fs/btrfs/extent-tree.c:847
 insert_inline_extent_backref+0x94/0x1a0 fs/btrfs/extent-tree.c:1172
 __btrfs_inc_extent_ref+0x120/0x56c fs/btrfs/extent-tree.c:1476
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1693 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1720 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:1969 [inline]
 __btrfs_run_delayed_refs+0xdd0/0x3280 fs/btrfs/extent-tree.c:2032
 btrfs_run_delayed_refs+0x288/0x47c fs/btrfs/extent-tree.c:2163
 btrfs_commit_transaction+0xfac/0x29f0 fs/btrfs/transaction.c:2392
 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
BTRFS error (device loop0): could not do orphan cleanup -4