Please try to reproduce bugs which are not obviously Hurd-specific on Debian GNU/Linux and then file them there.

If you find a genuine issue in Debian GNU/Hurd, please read this debian page to learn how to submit report a bug. If you are running Debian, then its much easier to use the reportbug package.

If you find a bug in the Hurd or GNU Mach themselves, either file a bug against the respective Debian packages, or directly at http://savannah.gnu.org/bugs/?group=hurd