[Webkit-unassigned] [Bug 175899] New: ASSERTION FAILED: !m_valueOrException under FontFaceSet::completedLoading loading a Serious Eats page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175899

            Bug ID: 175899
           Summary: ASSERTION FAILED: !m_valueOrException under
                    FontFaceSet::completedLoading loading a Serious Eats
                    page
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thorton at apple.com
                CC: mmaxfield at apple.com

Steps to Reproduce:

1. Load http://www.seriouseats.com/recipes/2017/08/roasted-carrots-black-sesame-dressing-recipe.html in a ToT debug build.

Expected: Carrots.
Actual: Crash. For me, every time. I have r221082.

ASSERTION FAILED: !m_valueOrException
/Users/thorton/src/WebKit/OpenSource/Source/WebCore/bindings/js/DOMPromiseProxy.h(291) : void WebCore::DOMPromiseProxyWithResolveCallback<WebCore::IDLInterface<WebCore::FontFaceSet> >::resolve(typename IDLType::ParameterType) [IDLType = WebCore::IDLInterface<WebCore::FontFaceSet>]
1   0x195c0a9ad WTFCrash
2   0x188aab579 WebCore::DOMPromiseProxyWithResolveCallback<WebCore::IDLInterface<WebCore::FontFaceSet> >::resolve(WebCore::FontFaceSet&)
3   0x188aac779 WebCore::FontFaceSet::completedLoading()
4   0x18856f1b0 WebCore::CSSFontFaceSet::decrementActiveCount()
5   0x188574363 WebCore::CSSFontFaceSet::fontStateChanged(WebCore::CSSFontFace&, WebCore::CSSFontFace::Status, WebCore::CSSFontFace::Status)
6   0x18856d5c7 WebCore::CSSFontFace::setStatus(WebCore::CSSFontFace::Status)::$_14::operator()(WebCore::CSSFontFace::Client&) const

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