Description of problem: If rootfs has an lvm snapshots, system won't boot. Steps to Reproduce: lvcreate -L1G -snroot_s1 sysvg/rootlv shutdown -r now Workaround: Boot rescue, and delete snapshot lv on rootfs.
In my test case, the sysvg volume group is on an raid1 md. Not sure if that's significant.
Bug vanished in f10.