[Webkit-unassigned] [Bug 206241] New: REGRESSION: WK1 Accessibility: ASSERTION FAILED: FontCache::singleton().generation() == m_generation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206241

            Bug ID: 206241
           Summary: REGRESSION: WK1 Accessibility: ASSERTION FAILED:
                    FontCache::singleton().generation() == m_generation
           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: ddkilzer at webkit.org
                CC: cfleizach at apple.com, jlewis3 at apple.com,
                    mmaxfield at apple.com, tsavell at apple.com

The following layout tests are flakey crashes on Apple Mojave Debug WK1 (Tests):

  accessibility/mac/search-text/search-text.html
  <https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=accessibility%2Fmac%2Fsearch-text%2Fsearch-text.html>

  accessibility/mac/select-text/select-text-1.html
  <https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&revision=254433&tests=accessibility%2Fmac%2Fselect-text%2Fselect-text-1.html>

Example test run:  <https://build.webkit.org/builders/Apple%20Mojave%20Debug%20WK1%20(Tests)/builds/7970>
Example test results:  <https://build.webkit.org/results/Apple%20Mojave%20Debug%20WK1%20(Tests)/r254433%20(7970)/results.html>

This crash is the same assertion as this bug, but seems to have a different cause (and different stack trace):

  Bug 204933: REGRESSION: ASSERTION FAILED: FontCache::singleton().generation() == m_generation

Assertion failure:

ASSERTION FAILED: FontCache::singleton().generation() == m_generation
./platform/graphics/FontCascadeFonts.cpp(180) : const WebCore::FontRanges &WebCore::FontCascadeFonts::realizeFallbackRangesAt(const WebCore::FontCascadeDescription &, unsigned int)
1   0x115928659 WTFCrash
2   0x126a72f8b WTFCrashWithInfo(int, char const*, char const*, int)
3   0x12a30617d WebCore::FontCascadeFonts::realizeFallbackRangesAt(WebCore::FontCascadeDescription const&, unsigned int)
4   0x126c12101 WebCore::FontCascadeFonts::primaryFont(WebCore::FontCascadeDescription const&)
5   0x126c0c1e4 WebCore::FontCascade::primaryFont() const
6   0x1298bc475 WebCore::FontCascade::fontMetrics() const
7   0x12aae5a55 WebCore::RenderStyle::fontMetrics() const
8   0x128fee241 WebCore::CSSPrimitiveValue::equalForLengthResolution(WebCore::RenderStyle const&, WebCore::RenderStyle const&)
9   0x12ac10884 WebCore::Style::MatchedDeclarationsCache::Entry::isUsableAfterHighPriorityProperties(WebCore::RenderStyle const&) const
10  0x12ac5e429 WebCore::Style::Resolver::applyMatchedProperties(WebCore::Style::Resolver::State&, WebCore::Style::MatchResult const&, WebCore::Style::Resolver::UseMatchedDeclarationsCache)
11  0x12ac5cdcc WebCore::Style::Resolver::styleForElement(WebCore::Element const&, WebCore::RenderStyle const*, WebCore::RenderStyle const*, WebCore::RuleMatchingBehavior, WebCore::SelectorFilter const*)
12  0x12ac89e52 WebCore::Style::TreeResolver::styleForElement(WebCore::Element&, WebCore::RenderStyle const&)
13  0x12ac8a37b WebCore::Style::TreeResolver::resolveElement(WebCore::Element&)
14  0x12ac8be09 WebCore::Style::TreeResolver::resolveComposedTree()
15  0x12ac8cbc8 WebCore::Style::TreeResolver::resolve()
16  0x12922d34d WebCore::Document::resolveStyle(WebCore::Document::ResolveStyleType)
17  0x12922debd WebCore::Document::updateStyleIfNeeded()
18  0x129229249 WebCore::Document::updateLayout()
19  0x12922a7ce WebCore::Document::updateLayoutIgnorePendingStylesheets(WebCore::Document::RunPostLayoutTasks)
20  0x128bd982e WebCore::AccessibilityObject::updateBackingStore()
21  0x12b2461ba -[WebAccessibilityObjectWrapperBase updateObjectBackingStore]
22  0x12b255ab5 -[WebAccessibilityObjectWrapper accessibilityAttributeValue:]
23  0x10eac8709 AccessibilityController::accessibleElementById(OpaqueJSString*)
24  0x10eac7e6b getAccessibleElementByIdCallback(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSValue*, unsigned long, OpaqueJSValue const* const*, OpaqueJSValue const**)
25  0x115f43741 long long JSC::APICallbackFunction::call<JSC::JSCallbackFunction>(JSC::JSGlobalObject*, JSC::CallFrame*)
26  0x4a6f8f201027
27  0x115e45fd0 llint_entry
28  0x115e28ef3 vmEntryToJavaScript
29  0x116bf9d57 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*)
30  0x116bf93b6 JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::JSGlobalObject*, JSC::JSObject*)
31  0x116f5ef1c JSC::evaluate(JSC::JSGlobalObject*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr<JSC::Exception>&)

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