Description of problem: ><fs> btrfs-subvolume-list / libguestfs: error: btrfs_subvolume_list: unexpected output from 'btrfs subvolume list' command: ID 256 gen 30 top level 5 path root gen is new.
Patch posted: http://www.redhat.com/archives/libguestfs/2013-January/msg00058.html
I pushed this upstream.
libguestfs-1.20.2-5.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/libguestfs-1.20.2-5.fc18
libguestfs-1.20.2-5.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.