QA output created by 249
ERROR: unexpected number of devices: 1 >= 1
ERROR: if seed device is used, try running this command as root
FAILED: btrfs filesystem usage, ret 1. Check btrfs.ko and btrfs-progs version.
(see /xfstests-dev/results//btrfs_normal_freespacetree/btrfs/249.full for details)