On Tue, 25 Jul 2017 at 07:37:10 +1000
Ozi Traveller <ozitraveller@???> wrote:

> https://www.theregister.co.uk/2017/07/24/underscore_domain_name_bug/

Quote:

    «His speculation that libidn2, which adds internationalised domain
    names support to the resolver, was at fault turned out to be
    accurate. Rebuilding Systemd without that library cleared the
    problem.»

So, this time the source of the problem was not systemd, but a library it
used.