http://bugs.winehq.org/show_bug.cgi?id=11050
--- Comment #8 from Roderick Colenbrander thunderbird2k@gmx.net 2008-01-05 12:52:33 --- This is the driver bug I was fearing. In order to print out GL/GLX a GLX context is created, so that GL/GLX calls can be made. Once the info is printed we don't need the context anymore and kill it. We do so only if we got a valid context before. In your case the context looks valid (else no GL/GLX call is possible) but killing the context for some reason doesn't work.
This shouldn't happen at all and is a driver or Mesa bug. I would contact them.