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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - xserver crash in gtk+ application"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90940#c8">Comment # 8</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - xserver crash in gtk+ application"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90940">bug 90940</a>
              from <span class="vcard"><a class="email" href="mailto:michal@physics.ubc.ca" title="Carl Michal <michal@physics.ubc.ca>"> <span class="fn">Carl Michal</span></a>
</span></b>
        <pre>I got it:

diff --git a/src/sna/sna_tiling.c b/src/sna/sna_tiling.c
index 308efc0..6ca2402 100644
--- a/src/sna/sna_tiling.c
+++ b/src/sna/sna_tiling.c
@@ -369,7 +369,7 @@ sna_tiling_composite_spans_boxes(struct sna *sna,
                                 const BoxRec *box, int nbox, float opacity)
 {
        while (nbox--)
-               sna_tiling_composite_spans_box(sna, op->base.priv, box++,
opacity);
+               sna_tiling_composite_spans_box(sna, op, box++, opacity);
        (void)sna;
 }</pre>
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