Please close/resolve this thread. I foudn the answer on this post: https://forums.fogproject.org/topic/9604/kernel-offset-disabled-end-kernel-panic-not-syncing-vfs-unable-to-mount-root-fs/4 turns out my org must still somehow be pushing out pxelinux.0 even though admins said not. So I renamed a copy of undionly to pxelinux and its working. 🙂