BTRFS info (device loop1): relocating block group 5242880 flags data|metadata
BTRFS info (device loop1): found 9 extents, stage: move data extents
BTRFS info (device loop1): found 1 extents, stage: update data pointers
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 9175 Comm: syz.1.887 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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+0x2b8/0x1b2c 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_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xa8/0xac kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __folio_mark_dirty+0x838/0xce0 mm/page-writeback.c:2642
 filemap_dirty_folio+0xf0/0x1b4 mm/page-writeback.c:2672
 folio_mark_dirty+0x118/0x198 mm/page-writeback.c:2771
 set_page_dirty+0x58/0x78 mm/folio-compat.c:62
 btrfs_page_set_dirty+0x70/0x19c fs/btrfs/subpage.c:699
 set_extent_buffer_dirty+0x33c/0x49c fs/btrfs/extent_io.c:4891
 btrfs_mark_buffer_dirty+0x14c/0x218 fs/btrfs/disk-io.c:4834
 btrfs_force_cow_block+0xc68/0x187c fs/btrfs/ctree.c:528
 btrfs_cow_block+0x2d0/0x710 fs/btrfs/ctree.c:616
 btrfs_search_slot+0xa54/0x2364 fs/btrfs/ctree.c:2080
 btrfs_update_device+0x118/0x3fc fs/btrfs/volumes.c:2945
 remove_chunk_item+0x154/0x3c4 fs/btrfs/volumes.c:3149
 btrfs_remove_chunk+0x780/0x17b0 fs/btrfs/volumes.c:3237
 btrfs_relocate_chunk+0x24c/0x364 fs/btrfs/volumes.c:3389
 __btrfs_balance+0x1390/0x1af8 fs/btrfs/volumes.c:4092
 btrfs_balance+0xa44/0xe20 fs/btrfs/volumes.c:4468
 btrfs_ioctl_balance+0x3c0/0x5f8 fs/btrfs/ioctl.c:4531
 btrfs_ioctl+0xac4/0xbd0 fs/btrfs/ioctl.c:5570
 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 info (device loop1): balance: ended with status: 0