I'm getting Input/output error, Invalid argument, No space left on device errors in the Creating ramdisk step. What does this mean?
This is most likely caused by errors earlier in the build process. Look further up in the logs to get some hints about what step is failing. This can also be caused by not having enough space, see issue #7 for more details.
This problem could possibily be caused when the kernel.config was outdated for the version of Linux Kernel that LFS is using. See #7 (comment) for more about what the logs tend to look like with this issue.
Sometimes open and closed GitHub issues have a lot of good debugging steps. Checking those is a good place to start. Searching on Google or through the LFS book is also a good step to help debug. If you still can't find your answer submit an issue on this GitHub repo.