Created attachment 133944 [details]
Output of "glxinfo -s -l"

In the game Crea (http://store.steampowered.com/app/280520 and
https://www.humblebundle.com/store/crea), when opening the map to the
full-window, non-overlay view on recent Mesa, the screen constantly flashes
with a green hatching that makes the map impossible to make out. The flashing
seems to occur between frames, since the snapshots taken by glretrace don't
reflect the issue even though replaying a trace does. The problem first shows
up with commit 147d7fb772 "st/mesa: add a winsys buffers list in st_context".

The apitrace
https://drive.google.com/file/d/0B-61xmxFzL-fTklGMzRiSERlTUE/view?usp=sharing
shows the game loading and me bringing up the map; once the non-overlay map
mode is reached is when the green flashing starts for me (when Mesa is at or
past the aforementioned commit, including 17.2.0-rc5).

I'm running Gentoo Linux on a Ryzen 1800X with a Radeon RX480, and Mesa was
compiled against LLVM 4.0.1 (though I usually use Mesa and LLVM git), using gcc
6.4.0 for building everything. And I'm running Xorg 1.19.3 and kernel 4.12.7.