updates-testing unknown filesystem type 'btrfs'

I had a working UEFI Fedora 20 all on Btrfs 'infrastructure' (minimal install plus docs and a few additional services basically). Everything was up to date and working. I enabled updates-testing and did a yum update, a kernel update was not part of the update, rebooted and now I get dropped very early on to a dracut shell. mount: unknown filesystem type 'btrfs' sysroot.mount mount process existed, code-exited status=32 Failed to mount /sysroot I have no idea what could have done this that's in updates-testing right now. Weird. And unfortunately I did not take a snapshot before the yum update so it might be a while before I get around to reproducing this. Chris Murphy