Hi, I've hit this bugs as well, analysed it and came up with a workaround patch.
Please see upstream bug report: https://bugs.freedesktop.org/show_bug.cgi?id=54779 -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org