Summary: Ref T6185. Although it seems that we can't easily defuse or mitigate this, we can at least warn administrators.
Test Plan: Ran on my (unpatched, local) system, got a setup warning.
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T6185
Differential Revision: https://secure.phabricator.com/D10561