BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 26731 Comm: syz.5.4512 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c 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:3777 [inline]
 validate_chain kernel/locking/lockdep.c:3798 [inline]
 __lock_acquire+0x1864/0x6634 kernel/locking/lockdep.c:5063
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 free_extent_buffer+0x240/0x428 fs/btrfs/extent_io.c:4791
 btrfs_search_slot_get_root fs/btrfs/ctree.c:1729 [inline]
 btrfs_search_slot+0x5bc/0x2380 fs/btrfs/ctree.c:2047
 lookup_inline_extent_backref+0x284/0xeb8 fs/btrfs/extent-tree.c:847
 lookup_extent_backref fs/btrfs/extent-tree.c:1074 [inline]
 __btrfs_free_extent+0x22c/0x2254 fs/btrfs/extent-tree.c:2985
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1696 [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+0xbc4/0x3374 fs/btrfs/extent-tree.c:2033
 btrfs_run_delayed_refs+0x11c/0x474 fs/btrfs/extent-tree.c:2164
 btrfs_commit_transaction+0x1028/0x28e4 fs/btrfs/transaction.c:2409
 btrfs_sync_file+0xa9c/0xfac fs/btrfs/file.c:2014
 btrfs_remap_file_range+0x66c/0xb40 fs/btrfs/reflink.c:920
 vfs_copy_file_range+0xbdc/0x1118 fs/read_write.c:1518
 __do_sys_copy_file_range fs/read_write.c:1596 [inline]
 __se_sys_copy_file_range fs/read_write.c:1559 [inline]
 __arm64_sys_copy_file_range+0x4e0/0x800 fs/read_write.c:1559
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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