Created attachment 124282 [details]
oom

Tonga with xserver 1.8.3, agd5f drm-next-4.8-wip, git
mesa/llvm/libdrm/xf86-video-amdgpu.

Desktop is fluxbox = non-compositing.

Since -

commit ed0e9862c56d13381f0414b5a835fd31960edfe6
Author: Nicolai Hähnle <nicolai.haehnle@amd.com>
Date:   Tue Apr 26 13:19:28 2016 -0500

    st/mesa: implement PBO downloads for ReadPixels

    v2: require PIPE_CAP_SAMPLER_VIEW_TARGET; technically only needed for some
of
        the texture targets, but all hardware that has shader images should
also
        have this cap.

I can provoke an oom on xorg as attached by displaying a couple of 1920 xwds
with display from ImageMagick and flipping between then, plus some middle mouse
clicking (which magnifys a section and gives info on the pixel clicked).

Oom is not instant - may take a couple of minutes clicking/flipping.

Polling free when doing this doesn't indicate any issue until it triggers so
it's not slowly leaking, but goes quickly at some point filling swap then oom.