This issue is simple to reproduce and observe if kmemleak is enabled.
Two simple ways to reproduce it:

** 1

$ mkfs.btrfs -f /dev/loop0
$ mount /dev/loop0 /mnt/btrfs
$ btrfs balance start /mnt/btrfs
$ umount /mnt/btrfs

** 2

$ mkfs.btrfs -f /dev/loop0
$ mount /dev/loop0 /mnt/btrfs
$ touch /mnt/btrfs/foobar
$ rm -f /mnt/btrfs/foobar
$ umount /mnt/btrfs

After a while, kmemleak reports the leak:

$ cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff880402b13e00 (size 128):
  comm "btrfs", pid 19621, jiffies 4341648183 (age 70057.844s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 fc c6 b1 04 88 ff ff 04 00 04 00 ad 4e ad de  .............N..
  backtrace:
    [<ffffffff817275a6>] kmemleak_alloc+0x26/0x50
    [<ffffffff8117832b>] kmem_cache_alloc_trace+0xeb/0x1d0
    [<ffffffffa04db499>] btrfs_alloc_block_rsv+0x39/0x70 [btrfs]
    [<ffffffffa04f8bad>] btrfs_orphan_add+0x13d/0x1b0 [btrfs]
    [<ffffffffa04e2b13>] btrfs_remove_block_group+0x143/0x500 [btrfs]
    [<ffffffffa0518158>] btrfs_relocate_chunk.isra.63+0x618/0x790 [btrfs]
    [<ffffffffa051bc27>] btrfs_balance+0x8f7/0xe90 [btrfs]
    [<ffffffffa05240a0>] btrfs_ioctl_balance+0x250/0x550 [btrfs]
    [<ffffffffa05269ca>] btrfs_ioctl+0xdfa/0x25f0 [btrfs]
    [<ffffffff8119c936>] do_vfs_ioctl+0x96/0x570
    [<ffffffff8119cea1>] SyS_ioctl+0x91/0xb0
    [<ffffffff81750242>] system_call_fastpath+0x16/0x1b
    [<ffffffffffffffff>] 0xffffffffffffffff

This affects btrfs-next, revision be8e3cd00d7293dd177e3f8a4a1645ce09ca3acb
(Btrfs: separate out tests into their own directory).
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>