https://bugs.freedesktop.org/show_bug.cgi?id=34418
--- Comment #11 from Wiktor Janas wixorpeek@gmail.com 2011-02-21 03:41:51 PST --- I did tests with kwin crashes and they start with 2a904fd ("st/mesa: set vertex arrays state only when necessary"). My system is 64-bit too, as indicated in original bug report.