Installing fedora core test5 in a reiserfs partition fails to boot. An error about getattrx is reported repeately and about libc.so.6 (is not accessible or something). The problem must be in SElinux or kernel (2.6.15-1.1955_FC5) Same installation in ext3 partition works fine.
right now the answer is 'use one or the other', until reiserfs xattrs get fixed upstream. *** This bug has been marked as a duplicate of 181766 ***