downstream bug from ubuntu: https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/927168 started happening for more people when the default fallback session started using llvmpipe. Applies to 8.0.x and 9.0. It's worked around for now ("Check that pixmaps which aren't managed by us actually exist before binding") but a proper fix should be added to mesa. some stacktraces: https://launchpadlibrarian.net/115551011/Stacktrace.txt https://launchpadlibrarian.net/115545323/Stacktrace.txt https://launchpadlibrarian.net/115549285/Stacktrace.txt https://launchpadlibrarian.net/115587684/Stacktrace.txt https://launchpadlibrarian.net/115563588/Stacktrace.txt https://launchpadlibrarian.net/115553644/Stacktrace.txt
IIUC the compiz-core patch https://i116412274.restricted.launchpadlibrarian.net/116412274/2c4b2354-00dc-11e2-a4a9-002481e91f22.txt?token=60HdnFNMGFc5zJXJwfwH9pN2wg6pmXxn the fix consisted of not calling glXBindTexImageEXT when XGetGeometry (dpy, pixmap, ...) returns false. https://www.opengl.org/registry/specs/EXT/texture_from_pixmap.txt does say that "Currently, only pixmaps can be bound to textures. If <draw> is not a valid GLXPixmap, then a GLXBadPixmap error is generated." so indeed this should be handled better. This technically is a bug in st/dri though.
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