Turns out that the issue is relevant for me as well, since the debian squeeze->wheezy/sid update.
The X server simply segfault-ed. At first, I thought it's an intel driver issue (2.13.0+xx -> 2.14.0 update), but it happens with the radeon driver as well. I've managed to create a somewhat usable backtrace using corefiles, but it looks like the issue has already been "resolved" (as in "there's a patch-fix for it"), but something makes the Xorg developers ignore the bug report filed on 2011-02-19 - https://bugs.freedesktop.org/show_bug.cgi?id=34474
There's also a bugreport entry in the debian-linux bugzilla, without replies.
So there's a trivial patch for it, but it doesn't seem to attract much attention. Maybe it's going to be included in the next Xorg release and it's just kept untouched until then. Maybe somebody needs to "bump" that bug / try the proposed patch first.
Well, ... at least it's not really related to wine.