Following the trail (starting with CentOS) of ` "rpm -qi util-linux" -> " -> " -> README ` which says:
BUG REPORTING:
E-MAIL: util-linux@vger.kernel.org
Web:
This project has no resources to provide support for distribution specific
issues. For end users it is recommended to utilize the distribution's
support system.
If you believe the issue is generic to all util-linux installs (and can demonstrate it with a copy compiled from github) then send to the list. Otherwise you should contact the support address for the distribution you're using (eg < on Debian).