what OS and other things?
I'm on GNU/Linux.
Also, when calling haskell code as if it were C code, you need to init the RTS its using, its not going to magically know you're linking to it from haskell.(though maybe you can arrange things to use the pre inited hs runtime, but i'm not familiar with how to do so) http://www.haskell.org/haskellwiki/Calling_Haskell_from_C
You mean I should foreign import hs_init and call it from within my haskell code, then dlopen the library and use dlsym "__stginit_Test" to call the foreign imported hs_add_root with it before calling test? (I tested that this doesn't fix it) I'm already calling test from within an initialized runtime system (since I call it from haskell code), otherwise I'd probably get no result at all and not just an error when dlclose is called and a garbage collection occurs.