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<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>42894</bug_id>
          
          <creation_ts>2010-07-23 06:46:29 -0700</creation_ts>
          <short_desc>RenderLayer crashes on page with MathML</short_desc>
          <delta_ts>2010-08-26 16:59:52 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Layout and Rendering</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Mac (Intel)</rep_platform>
          <op_sys>OS X 10.5</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P4</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Alex Milowski">alex</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>abarth</cc>
    
    <cc>aroben</cc>
    
    <cc>commit-queue</cc>
    
    <cc>eric</cc>
    
    <cc>hyatt</cc>
    
    <cc>kenneth</cc>
    
    <cc>mitz</cc>
    
    <cc>sausset</cc>
    
    <cc>webkit.review.bot</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>255355</commentid>
    <comment_count>0</comment_count>
      <attachid>62423</attachid>
    <who name="Alex Milowski">alex</who>
    <bug_when>2010-07-23 06:46:29 -0700</bug_when>
    <thetext>Created attachment 62423
Patch to fix crash

The code in RenderLayer makes some assumptions about the rendering tree that turn out to not be true.  As such, it does get a render object back in certain methods and causes an exception and crash due to a zero pointer.

An example page that has this issue is:

   http://golem.ph.utexas.edu/wiki/instiki/show/Sandbox

The attached patch fixes the crash.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255376</commentid>
    <comment_count>1</comment_count>
      <attachid>62423</attachid>
    <who name="Kenneth Rohde Christiansen">kenneth</who>
    <bug_when>2010-07-23 07:59:17 -0700</bug_when>
    <thetext>Comment on attachment 62423
Patch to fix crash

The patch seems OK, but why wasn&apos;t this needed before? I mean, maybe the code is correct assuming that we will have an actualRenderer and the bug is elsewhere. Would be nice if Hyatt could have a look.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255377</commentid>
    <comment_count>2</comment_count>
    <who name="Kenneth Rohde Christiansen">kenneth</who>
    <bug_when>2010-07-23 07:59:48 -0700</bug_when>
    <thetext>Hyatt, can you have a look? Is the actualRenderer != 0 assumption wrong?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255378</commentid>
    <comment_count>3</comment_count>
    <who name="">mitz</who>
    <bug_when>2010-07-23 08:01:11 -0700</bug_when>
    <thetext>Why isn&apos;t there a regression test?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255386</commentid>
    <comment_count>4</comment_count>
    <who name="Alex Milowski">alex</who>
    <bug_when>2010-07-23 08:22:37 -0700</bug_when>
    <thetext>(In reply to comment #1)
&gt; (From update of attachment 62423 [details])
&gt; The patch seems OK, but why wasn&apos;t this needed before? I mean, maybe the code is correct assuming that we will have an actualRenderer and the bug is elsewhere. Would be nice if Hyatt could have a look.

It is unclear why this is happening except that the referenced page is much more complex than our tests.  This must be coming from the combination of the styles used on the page in conjunction with the MathML rendering.  

The backtrace has this happening at the time that setStyle() is called the newly created RenderMathMLMath instance in the createRenderer() call on the MathMLMathElement.   When the setStyle() is called, it causes a style difference to be calculated and that is when things go wrong.

That code looks like:

RenderObject* MathMLMathElement::createRenderer(RenderArena* arena, RenderStyle* style)
{
    RenderMathMLMath* renderer = new (arena) RenderMathMLMath(this);
    renderer-&gt;setStyle(style);
    return renderer;
}</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255387</commentid>
    <comment_count>5</comment_count>
    <who name="Alex Milowski">alex</who>
    <bug_when>2010-07-23 08:24:04 -0700</bug_when>
    <thetext>(In reply to comment #3)
&gt; Why isn&apos;t there a regression test?

Good point but very hard to narrow down from that page.  I&apos;ll see what I can do to create a test case.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255578</commentid>
    <comment_count>6</comment_count>
    <who name="Alex Milowski">alex</who>
    <bug_when>2010-07-23 15:17:15 -0700</bug_when>
    <thetext>The layer is only created when someone has a CSS rule like:

math {
    overflow: auto;
}

We don&apos;t have that in any of our tests but that website does.  That&apos;s why we
haven&apos;t seen this before.

Oddly, the MathML code is the only code that calls setStyle() in createRenderer() and that is why this problem is localized to the MathML implementation.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>255585</commentid>
    <comment_count>7</comment_count>
    <who name="Alex Milowski">alex</who>
    <bug_when>2010-07-23 15:27:16 -0700</bug_when>
    <thetext>Removing the use of setStyle() in createRenderer() also fixes the crash.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>259368</commentid>
    <comment_count>8</comment_count>
      <attachid>63320</attachid>
    <who name="François Sausset">sausset</who>
    <bug_when>2010-08-03 04:17:16 -0700</bug_when>
    <thetext>Created attachment 63320
Revised patch

New patch removing unnecessary calls to setStyle() plus a regression test (from Alex).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>260166</commentid>
    <comment_count>9</comment_count>
      <attachid>63320</attachid>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2010-08-04 12:57:09 -0700</bug_when>
    <thetext>Comment on attachment 63320
Revised patch

Clearing flags on attachment: 63320

Committed r64668: &lt;http://trac.webkit.org/changeset/64668&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>260167</commentid>
    <comment_count>10</comment_count>
    <who name="WebKit Commit Bot">commit-queue</who>
    <bug_when>2010-08-04 12:57:14 -0700</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>260172</commentid>
    <comment_count>11</comment_count>
    <who name="Adam Roben (:aroben)">aroben</who>
    <bug_when>2010-08-04 13:01:42 -0700</bug_when>
    <thetext>Seems like the regression test could have used dumpAsText in order to have cross-platform results. There&apos;s no need for a whole render tree dump when you just want to find out if you crashed or not.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>260185</commentid>
    <comment_count>12</comment_count>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2010-08-04 13:24:16 -0700</bug_when>
    <thetext>http://trac.webkit.org/changeset/64668 might have broken GTK Linux 64-bit Debug
The following changes are on the blame list:
http://trac.webkit.org/changeset/64667
http://trac.webkit.org/changeset/64668
http://trac.webkit.org/changeset/64669</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>260583</commentid>
    <comment_count>13</comment_count>
    <who name="Alex Milowski">alex</who>
    <bug_when>2010-08-05 07:00:57 -0700</bug_when>
    <thetext>(In reply to comment #11)
&gt; Seems like the regression test could have used dumpAsText in order to have cross-platform results. There&apos;s no need for a whole render tree dump when you just want to find out if you crashed or not.

I expect to expand the use of user styles directly on MathML &apos;math&apos; element as this test case demonstrates.  As such, having a pixel dump is a good thing.

Otherwise, yes, I agree.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>260652</commentid>
    <comment_count>14</comment_count>
    <who name="Eric Seidel (no email)">eric</who>
    <bug_when>2010-08-05 09:16:25 -0700</bug_when>
    <thetext>(In reply to comment #13)
&gt; (In reply to comment #11)
&gt; &gt; Seems like the regression test could have used dumpAsText in order to have cross-platform results. There&apos;s no need for a whole render tree dump when you just want to find out if you crashed or not.
&gt; 
&gt; I expect to expand the use of user styles directly on MathML &apos;math&apos; element as this test case demonstrates.  As such, having a pixel dump is a good thing.
&gt; 
&gt; Otherwise, yes, I agree.

Generally each test has its own purpose.  Are you suggesting you&apos;re going to modify this test later on and thus need pixel test results?

I can&apos;t think of any reason for a crashing test to ever need pixel results, unless its crashing painting code. :)</thetext>
  </long_desc>
      
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            <date>2010-07-23 06:46:29 -0700</date>
            <delta_ts>2010-08-26 16:59:52 -0700</delta_ts>
            <desc>Patch to fix crash</desc>
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            <date>2010-08-03 04:17:16 -0700</date>
            <delta_ts>2010-08-04 12:57:09 -0700</delta_ts>
            <desc>Revised patch</desc>
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          </attachment>
      

    </bug>

</bugzilla>