All of those failing test scripts involve threads - and I suspect that all of the passing test scripts do not involve threads - and you may well find that what you're seeing is the result of threads bugs. If threads are not going to be used, then I would just ignore the errors. Otherwise, first thing I would try is to update the threads installation (from CPAN source).
Was your perl built with '-Duseithreads' ? (In other words, does 'perl -V:useithreads' report 'define' ?) I've assumed the answer is "yes".