[Webkit-unassigned] [Bug 100268] New: Layout Test mathml/presentation/mo-stretch.html and row.xhtml sometimes crash debug bots

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100268

           Summary: Layout Test mathml/presentation/mo-stretch.html and
                    row.xhtml sometimes crash debug bots
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://test-results.appspot.com/dashboards/flakiness_d
                    ashboard.html#tests=mathml%2Fpresentation%2Frow.xhtml
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: leviw at chromium.org
                CC: eric at webkit.org, leviw at chromium.org,
                    dbarton at mathscribe.com


Same sort of backtrace on both:

STDERR: ASSERTION FAILED: m_purgePreventCount
STDERR: /Volumes/data/b/build/slave/webkit-mac-latest-dbg/build/src/third_party/WebKit/Source/WebCore/WebCore.gyp/../platform/graphics/FontCache.cpp(317) : PassRefPtr<WebCore::SimpleFontData> WebCore::FontCache::getCachedFontData(const WebCore::FontPlatformData *, WebCore::FontCache::ShouldRetain)
STDERR: 1   0x12b11cb9 WebCore::FontCache::getCachedFontData(WebCore::FontPlatformData const*, WebCore::FontCache::ShouldRetain)
STDERR: 2   0x12c3c6d9 WebCore::FontCache::getFontDataForCharacters(WebCore::Font const&, unsigned short const*, int)
STDERR: 3   0x12b2f3de WebCore::Font::glyphDataAndPageForCharacter(int, bool, WebCore::FontDataVariant) const
STDERR: 4   0x12b323b3 WebCore::Font::glyphDataForCharacter(int, bool, WebCore::FontDataVariant) const
STDERR: 5   0x13f087a6 WebCore::RenderMathMLOperator::glyphHeightForCharacter(unsigned short)
STDERR: 6   0x13f08b53 WebCore::RenderMathMLOperator::updateFromElement()
STDERR: 7   0x13f08620 WebCore::RenderMathMLOperator::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
STDERR: 8   0x13e14f48 WebCore::RenderObject::setStyle(WTF::PassRefPtr<WebCore::RenderStyle>)
STDERR: 9   0x13e1456c WebCore::RenderObject::setAnimatableStyle(WTF::PassRefPtr<WebCore::RenderStyle>)
STDERR: 10  0x124d33e7 WebCore::Node::setRenderStyle(WTF::PassRefPtr<WebCore::RenderStyle>)
STDERR: 11  0x1245e685 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)
STDERR: 12  0x1245eb08 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)
STDERR: 13  0x1245eb08 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)
STDERR: 14  0x1245eb08 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)
STDERR: 15  0x1245eb08 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)
STDERR: 16  0x1245eb08 WebCore::Element::recalcStyle(WebCore::Node::StyleChange)
STDERR: 17  0x12396a1c WebCore::Document::recalcStyle(WebCore::Node::StyleChange)
STDERR: 18  0x12392e67 WebCore::Document::styleResolverChanged(WebCore::StyleResolverUpdateFlag)
STDERR: 19  0x13b36cf9 WebCore::XMLDocumentParser::end()
STDERR: 20  0x13b36e3d WebCore::XMLDocumentParser::finish()
STDERR: 21  0x1386a4bd WebCore::DocumentWriter::end()
STDERR: 22  0x13844c0c WebCore::DocumentLoader::finishedLoading()
STDERR: 23  0x138ab56b WebCore::MainResourceLoader::didFinishLoading(double)
STDERR: 24  0x138cfe4f WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*, double)
STDERR: 25  0x12ce35aa WebCore::ResourceHandleInternal::didFinishLoading(WebKit::WebURLLoader*, double)
STDERR: 26  0x1c64ddfe webkit_glue::WebURLLoaderImpl::Context::OnCompletedRequest(int, bool, std::string const&, base::TimeTicks const&)
STDERR: 27  0x1108a3ad (anonymous namespace)::RequestProxy::NotifyCompletedRequest(int, std::string const&, base::TimeTicks const&)
STDERR: 28  0x1108abc7 base::internal::RunnableAdapter<void ((anonymous namespace)::RequestProxy::*)(int, std::string const&, base::TimeTicks const&)>::Run((anonymous namespace)::RequestProxy*, int const&, std::string const&, base::TimeTicks const&)
STDERR: 29  0x1108aac6 base::internal::InvokeHelper<false, void, base::internal::RunnableAdapter<void ((anonymous namespace)::RequestProxy::*)(int, std::string const&, base::TimeTicks const&)>, void ()((anonymous namespace)::RequestProxy* const&, int const&, std::string const&, base::TimeTicks const&)>::MakeItSo(base::internal::RunnableAdapter<void ((anonymous namespace)::RequestProxy::*)(int, std::string const&, base::TimeTicks const&)>, (anonymous namespace)::RequestProxy* const&, int const&, std::string const&, base::TimeTicks const&)
STDERR: 30  0x1108aa05 base::internal::Invoker<4, base::internal::BindState<base::internal::RunnableAdapter<void ((anonymous namespace)::RequestProxy::*)(int, std::string const&, base::TimeTicks const&)>, void ()((anonymous namespace)::RequestProxy*, int, std::string const&, base::TimeTicks const&), void ()((anonymous namespace)::RequestProxy*, int, std::string, base::TimeTicks)>, void ()((anonymous namespace)::RequestProxy*, int, std::string const&, base::TimeTicks const&)>::Run(base::internal::BindStateBase*)

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