The dev-tex/luatex is installed using the system libkpathsea library, which up to the ~2009-r2 version of texlive-core doesn't contain the necessary changes for loading a compiled lua file. The broken behaviour can be triggered by the supplied tex file, which tries to load a lua file, but breaks with "lualatex: fatal: kpse_init_format: Unknown format 56." (It could certainly be triggered in a better way, but this example is short ...) I think the upstream revision 16676, e.g. http://tug.org/svn/texlive/trunk/Build/source/texk/kpathsea/types.h?r1=16274&r2=16676 fixes this, but in the meantime, luatex isn't fully functional with either of the current texlive-core-2009-* versions. In detail, the tex tree inside luatex has the "kpse_clua_format" constant from the above patch, but the system-wide libkpathsea hasn't, so while trying to load the file, luatex hands over its own constant (which is 56) to the system library (where 56 is kpse_last_format, that is "one past last index") and therefore breaks. (tested on AMD64, packages pgf-2.00, texlive-core-2009-r2, luatex-0.60.2)
Created attachment 244479 [details] testcase
should be fixed with luatex 0.63.0 its not using system libkpathsea anymore; I'll about using it again with texlive 2010
