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            <b><a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED --- - [sna snb/ivb] corruption with chromium"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=66990#c34">Comment # 34</a>
              on <a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED --- - [sna snb/ivb] corruption with chromium"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=66990">bug 66990</a>
              from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
        <pre>(In reply to <a href="show_bug.cgi?id=66990#c33">comment #33</a>)
<span class="quote">> No, that's not it, sorry. I can still reproduce it with "SNA compiled from
> 2.21.14-27-g9645e71".

> I'll retest with latest drm-nightly-intel</span >

Can you also try with the quick little hack from c31

diff --git a/src/sna/sna_composite.c b/src/sna/sna_composite.c
index 58dd356..6f24eeb 100644
--- a/src/sna/sna_composite.c
+++ b/src/sna/sna_composite.c
@@ -520,7 +520,7 @@ sna_composite_fb(CARD8 op,
        if (mask)
                validate_source(mask);

-       if (mask == NULL &&
+       if (mask == NULL && 0 &&
            src->pDrawable &&
            dst->pDrawable->bitsPerPixel >= 8 &&
            src->filter != PictFilterConvolution &&

to sanity check that I am barking up the right tree.</pre>
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