BTRFS info (device loop6): balance: start -d -m -s
BTRFS info (device loop6): relocating block group 6881280 flags data|metadata
BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 6419 Comm: syz.6.374 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec 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:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x6c/0xb0 kernel/locking/spinlock.c:162
 __debug_check_no_obj_freed lib/debugobjects.c:968 [inline]
 debug_check_no_obj_freed+0x148/0x46c lib/debugobjects.c:1009
 slab_free_hook mm/slub.c:1704 [inline]
 slab_free_freelist_hook+0x104/0x1e8 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 kmem_cache_free+0x118/0x314 mm/slub.c:3709
 btrfs_free_path+0x60/0x78 fs/btrfs/ctree.c:92
 btrfs_update_device+0x328/0x418 fs/btrfs/volumes.c:2969
 remove_chunk_item+0x154/0x3e0 fs/btrfs/volumes.c:3149
 btrfs_remove_chunk+0x854/0x1864 fs/btrfs/volumes.c:3243
 btrfs_relocate_chunk+0x24c/0x364 fs/btrfs/volumes.c:3395
 __btrfs_balance+0x138c/0x1b34 fs/btrfs/volumes.c:4104
 btrfs_balance+0xa44/0xe18 fs/btrfs/volumes.c:4480
 btrfs_ioctl_balance+0x3c0/0x5f8 fs/btrfs/ioctl.c:4529
 btrfs_ioctl+0x95c/0xb38 fs/btrfs/ioctl.c:5586
 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+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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
BTRFS info (device loop6): relocating block group 5242880 flags data|metadata
BTRFS info (device loop6): found 8 extents, stage: move data extents
BTRFS info (device loop6): found 1 extents, stage: update data pointers
BTRFS info (device loop6): relocating block group 1048576 flags system
BTRFS info (device loop6): found 1 extents, stage: move data extents
BTRFS info (device loop6): balance: ended with status: 0