[Webkit-unassigned] [Bug 192687] New: ASSERTION FAILED: !m_beginTime in SMILTimeContainer (2018 edition)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192687

            Bug ID: 192687
           Summary: ASSERTION FAILED: !m_beginTime in SMILTimeContainer
                    (2018 edition)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

I see the bug in WebKitGTK while loading https://www.w3schools.com/html/html5_video.asp in r239184 in a debug build. Reproducible every time.

ASSERTION FAILED: !m_beginTime
../../Source/WebCore/svg/animation/SMILTimeContainer.cpp(132) : void WebCore::SMILTimeContainer::begin()
1   0x7f31eb52e9f4 /webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(WTFCrash+0x9) [0x7f31eb52e9f4]
2   0x7f31f88b6b79 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::SMILTimeContainer::begin()+0x45) [0x7f31f88b6b79]
3   0x7f31f8705850 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::SVGDocumentExtensions::startAnimations()+0xe0) [0x7f31f8705850]
4   0x7f31f76ae990 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::Document::implicitClose()+0x5be) [0x7f31f76ae990]
5   0x7f31f7cd60bb /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::FrameLoader::checkCallImplicitClose()+0xa1) [0x7f31f7cd60bb]
6   0x7f31f7cd5e31 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::FrameLoader::checkCompleted()+0x1e5) [0x7f31f7cd5e31]
7   0x7f31f7cd7378 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::FrameLoader::completed()+0xc2) [0x7f31f7cd7378]
8   0x7f31f7cd5e54 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::FrameLoader::checkCompleted()+0x208) [0x7f31f7cd5e54]
9   0x7f31f7d3b9b3 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::SubframeLoader::loadSubframe(WebCore::HTMLFrameOwnerElement&, WTF::URL const&, WTF::String const&, WTF::String const&)+0x2bf) [0x7f31f7d3b9b3]
10  0x7f31f7d3b659 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::SubframeLoader::loadOrRedirectSubframe(WebCore::HTMLFrameOwnerElement&, WTF::URL const&, WTF::AtomicString const&, WebCore::LockHistory, WebCore::LockBackForwardList)+0x16f) [0x7f31f7d3b659]
11  0x7f31f7d3a3f1 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::SubframeLoader::requestFrame(WebCore::HTMLFrameOwnerElement&, WTF::String const&, WTF::AtomicString const&, WebCore::LockHistory, WebCore::LockBackForwardList)+0x1ab) [0x7f31f7d3a3f1]
12  0x7f31f79a2408 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::HTMLFrameElementBase::openURL(WebCore::LockHistory, WebCore::LockBackForwardList)+0x1c6) [0x7f31f79a2408]
13  0x7f31f79a2760 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::HTMLFrameElementBase::didFinishInsertingNode()+0x8e) [0x7f31f79a2760]
14  0x7f31f766e079 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0xa9f3079) [0x7f31f766e079]
15  0x7f31f7669c41 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::ContainerNode::appendChildWithoutPreInsertionValidityCheck(WebCore::Node&)+0x215) [0x7f31f7669c41]
16  0x7f31f76699b5 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::ContainerNode::appendChild(WebCore::Node&)+0xc9) [0x7f31f76699b5]
17  0x7f31f77a0e9f /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::Node::appendChild(WebCore::Node&)+0x9f) [0x7f31f77a0e9f]
18  0x7f31f699fda3 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x9d24da3) [0x7f31f699fda3]
19  0x7f31f69a83db /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(+0x9d2d3db) [0x7f31f69a83db]
20  0x7f31f699fe14 /webkit/WebKitBuild/Debug/lib/libwebkit2gtk-4.0.so.37(WebCore::jsNodePrototypeFunctionAppendChild(JSC::ExecState*)+0x1f) [0x7f31f699fe14]
21  0x7f3192855177 [0x7f3192855177]

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