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    <body><span class="vcard"><a class="email" href="mailto:ap&#64;webkit.org" title="Alexey Proskuryakov &lt;ap&#64;webkit.org&gt;"> <span class="fn">Alexey Proskuryakov</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - &quot;ref test hashes didn't match but diff passed&quot; is useless, should not be logged"
   href="https://bugs.webkit.org/show_bug.cgi?id=153951">bug 153951</a>
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          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
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           <td style="text-align:right;">See Also</td>
           <td>
               &nbsp;
           </td>
           <td>https://bugs.webkit.org/show_bug.cgi?id=142632
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - &quot;ref test hashes didn't match but diff passed&quot; is useless, should not be logged"
   href="https://bugs.webkit.org/show_bug.cgi?id=153951#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - &quot;ref test hashes didn't match but diff passed&quot; is useless, should not be logged"
   href="https://bugs.webkit.org/show_bug.cgi?id=153951">bug 153951</a>
              from <span class="vcard"><a class="email" href="mailto:ap&#64;webkit.org" title="Alexey Proskuryakov &lt;ap&#64;webkit.org&gt;"> <span class="fn">Alexey Proskuryakov</span></a>
</span></b>
        <pre>Two of these are tracked in <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Some reftests get crazy snapshot sizes"
   href="show_bug.cgi?id=142632">bug 142632</a>, which I think is a real bug that needs to be fixed. Another known reason was <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [Mac WK2] Test snapshots are 1600x1200 on Retina devices"
   href="show_bug.cgi?id=139884">bug 139884</a>, which definitely needed to be discovered and fixed.

The best way to check the others is to edit single_test_runner.py so that it would report these tests as failing, and to manually compare the results. I think that the following should do it (untested):

-            if diff_result[0]:
-                failures.append(test_failures.FailureReftestMismatch(reference_filename))
-            else:
-                _log.warning(&quot;  %s -&gt; ref test hashes didn't match but diff passed&quot; % self._test_name)
+            failures.append(test_failures.FailureReftestMismatch(reference_filename))</pre>
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