http://bugs.winehq.org/show_bug.cgi?id=27291
--- Comment #25 from Dan Kegel dank@kegel.com 2011-09-18 05:03:50 CDT --- Which process were you stracing?
Also, it's vaguely possible that this is related to the graphics driver. You might try switching to a different driver version (or even try with an ati card) just to see.