http://bugs.winehq.org/show_bug.cgi?id=31800
--- Comment #10 from Henri Verbeet hverbeet@gmail.com 2012-09-26 05:18:42 CDT --- (In reply to comment #8)
I wasn't sure whom to inform. I thought Wine might be the one responsible, since no other application manages to trigger the segfault. I'll file a bug at freedesktop.org.
It's not always easy to tell, but as a general rule, if the backtrace starts inside the driver, file the bug at the freedesktop.org bug tracker first. (Your backtrace is also missing debug symbols for the driver, you'll want to install those before filing a bug a fd.o.)