sysconf (_SC_IOV_MAX) needs to return 1024, the kernel limit. Reported here: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/KURGEUYR4HLV43WHGZV236SYTJUW7YRU/ Needs to be fixed in F27 and rawhide.
glibc-2.26-15.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-0d3fdd3d1f
glibc-2.26-15.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-0d3fdd3d1f
glibc-2.26-15.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.