Testing systems for Y2038 safety is done by setting the clock to after 2038, and then running all available test suites. This however requires that actual Y2038 issues are not masked by key expiry errors (when tests hardcode expiry dates), and this is what happens in this particular test.
I've submitted a fix here: https://github.com/openssh/openssh-portable/pull/425 and here: https://bugzilla.mindrot.org/show_bug.cgi?id=3684 but no one's reacting so I thought I try this channel as well. Thanks, Alex
