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> The following piece of code causes Lua to crash in luaH_getstr on my 
> system (using the Debian Lua packages):
> ...
>         lua_rawgeti(l_st, LUA_REGISTRYINDEX, LUA_NOREF);
>         luaL_getn(l_st, -1);

This is a type error.  The result of `lua_rawgeti' is nil, right? So, if
you apply `luaL_getn' over nil you get such error. The C API does not
check its arguments (this is C after all ;) If you want to check this
kind of thing, you can recompile Lua defining `api_check' (see lapi.c).

-- Roberto