https://bugs.freedesktop.org/show_bug.cgi?id=78009
--- Comment #3 from almos aaalmosss@gmail.com --- Bug 77553 mentions commit 234db609544ee521458ce8b648e70cffe2fda6f9 as the culprit, but my git checkout is definitely earlier than that, and mesa 10.1.0-5 in Debian Sid shouldn't contain it, either.