[<0>] __filemap_fdatawait_range+0x8b/0xe0
[<0>] filemap_fdatawait_range+0xe/0x20
[<0>] btrfs_wait_ordered_range+0x69/0x110 [btrfs]
[<0>] __btrfs_wait_cache_io+0x42/0x1a0 [btrfs]
[<0>] btrfs_write_dirty_block_groups+0x13f/0x3a0 [btrfs]
[<0>] commit_cowonly_roots+0x228/0x2d0 [btrfs]
[<0>] btrfs_commit_transaction+0x4f8/0x9a0 [btrfs]
[<0>] prepare_to_merge+0x200/0x230 [btrfs]
[<0>] relocate_block_group+0x38c/0x620 [btrfs]
[<0>] btrfs_relocate_block_group+0x156/0x2d0 [btrfs]
[<0>] btrfs_relocate_chunk+0x31/0xa0 [btrfs]
[<0>] btrfs_balance+0x71a/0xee0 [btrfs]
[<0>] btrfs_ioctl_balance+0x292/0x340 [btrfs]
[<0>] btrfs_ioctl+0x84c/0x3060 [btrfs]
[<0>] do_vfs_ioctl+0x43d/0x6c0
[<0>] ksys_ioctl+0x5e/0x90
[<0>] __x64_sys_ioctl+0x16/0x20
[<0>] do_syscall_64+0x5f/0x1d0
[<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
