This is what I did
...I re-compiled Red-hat's 7.2 kernel (2.4.9-13 I think) with reiserfs support built-in (since that is what I made my /). Then, I copied it to the LFS system and it worked. I assume it is a kernel problem related either to how I compiled it (I'm willing to bet that was it), or there is something wrong with the kernel (i.e. a bug, but I doubt that).
I'm gonna continue testing the kernel until I get it right.
Thanks for your support with LFS Beekmans, I appreciate it.