[Webkit-unassigned] [Bug 64286] New: Regression: Relayout causes crash with some nested elements (input)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64286

           Summary: Regression: Relayout causes crash with some nested
                    elements (input)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pdr at google.com
                CC: dglazkov at google.com


Created an attachment (id=100308)
 --> (https://bugs.webkit.org/attachment.cgi?id=100308&action=review)
Test case of bug (click on the page to trigger crash)

Note that this is a regression, as Safari 5.0.5 does not crash, but Chrome 14.0.803.0 dev and WebKit trunk (@r90470) both do. See the attached test case for an example of the crash.

WebKit will crash if an input element is hidden (display:none) when it is nested in the following scenario:
<div style="position:absolute">
  <span style="position:relative">
    this_is_text
    <div style="position:absolute">
      <input id="hideMe"/>
    </div>
  </span>
</div>

Replacing the input with another element (e.g., a span) causes the crash to go away (possible shadow dom issue? cc'ed dglazkov for this reason) Similarly, the crash will go away if we remove any of the position:relative or position:absolute styles in this nesting, or remove the text node "this_is_text".

The crash occurs due to this failed assert (line 1822, file FrameView.cpp): ASSERT(!m_layoutRoot->container() || !m_layoutRoot->container()->needsLayout());

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