[Webkit-unassigned] [Bug 131480] New: REGRESSION (r166860): ASSERTION FAILED: !isCalculated() on fast/css/image-set-value-not-removed-crash.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=131480

           Summary: REGRESSION (r166860): ASSERTION FAILED:
                    !isCalculated() on
                    fast/css/image-set-value-not-removed-crash.html
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org
                CC: darin at apple.com, rniwa at webkit.org, akling at apple.com


Starting with <http://trac.webkit.org/r166860>, debug WK1 bots are hitting an assertion almost every time:

ASSERTION FAILED: !isCalculated()
/Volumes/Data/slave/mountainlion-debug/build/Source/WebCore/platform/Length.h(246) : float WebCore::Length::value() const
1   0x10bccc0c0 WTFCrash
2   0x10d71b619 WebCore::Length::value() const
3   0x10d9cae02 WebCore::valueForNinePieceImageSlice(WebCore::NinePieceImage const&)
4   0x10d9c37d6 WebCore::ComputedStyleExtractor::propertyValue(WebCore::CSSPropertyID, WebCore::EUpdateLayout) const
5   0x10d9cd7fe WebCore::ComputedStyleExtractor::copyPropertiesInSet(WebCore::CSSPropertyID const*, unsigned int) const
6   0x10d9c6ef8 WebCore::ComputedStyleExtractor::copyProperties() const
7   0x10dd3da81 WebCore::copyPropertiesFromComputedStyle(WebCore::ComputedStyleExtractor&, WebCore::EditingStyle::PropertiesToInclude)
8   0x10dd3d345 WebCore::EditingStyle::init(WebCore::Node*, WebCore::EditingStyle::PropertiesToInclude)
9   0x10dd3d23b WebCore::EditingStyle::EditingStyle(WebCore::Node*, WebCore::EditingStyle::PropertiesToInclude)
10  0x10dd3d1d3 WebCore::EditingStyle::EditingStyle(WebCore::Node*, WebCore::EditingStyle::PropertiesToInclude)
11  0x10d7cc8ff WebCore::EditingStyle::create(WebCore::Node*, WebCore::EditingStyle::PropertiesToInclude)
12  0x10dd3f135 WebCore::EditingStyle::styleAtSelectionStart(WebCore::VisibleSelection const&, bool)
13  0x10dd500c8 WebCore::Editor::selectionStartHasStyle(WebCore::CSSPropertyID, WTF::String const&) const
14  0x10dd69d6d WebCore::executeToggleStyle(WebCore::Frame&, WebCore::EditorCommandSource, WebCore::EditAction, WebCore::CSSPropertyID, char const*, char const*)

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