https://bugzilla.redhat.com/show_bug.cgi?id=1056185
--- Comment #12 from Tuomo Soini tis@foobar.fi --- Afaik builders don't have ipv6 connectivity so ipv6 tests are not actually doing real tests. Poblem only happens if you build on a machine with ipv6 connectivity where ipv6 tests can really happen.
Work-aound fo the poblem for now is adding || : at the end of ipv6 test line so failure which happens 100% of build times on a machine with ipv6 connectivity doesn't prevent building package and you could add a comment about ipv6 tests being completely broken on linux.