There was a bug in the godbus library that is now fixed (bug 1463511), so now we need to - get the bundled godbus in oci-register-machine updated - rebuild oci-register-machine against updated golang-github-godbus-dbus Full details about the issue are tracked in bug 1462296 Version-Release number of selected component (if applicable): oci-register-machine-0-3.7.gitbb20b00.fc26
with the fixed golang on s390x (bug #1460254) the build was successful