[Webkit-unassigned] [Bug 194596] New: [ Mac Debug ] ASSERTION FAILED: Layout Test performance-api/performance-observer-basic.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194596

            Bug ID: 194596
           Summary: [ Mac Debug ] ASSERTION FAILED: Layout Test
                    performance-api/performance-observer-basic.html is a
                    flaky crash
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac Debug

performance-api/performance-observer-basic.html

Probable cause:

Appears to be a flaky crash since inception. The oldest build I can spade is r228050

Reproducible with:

run-webkit-tests d228050 performance-api/performance-observer-basic.html --iterations 500 -f --debug
run-webkit-tests d228050 performance-api/performance-observer-basic.html --iterations 500 -f --debug -1 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=performance-api%2Fperformance-observer-basic.html

Crash log:

https://build.webkit.org/results/Apple%20Mojave%20Debug%20WK2%20(Tests)/r241432%20(1575)/performance-api/performance-observer-basic-stderr.txt

ASSERTION FAILED: !m_isolatedWorld->isNormal() || m_wrapper || !m_jsFunction
./bindings/js/JSEventListener.h(109) : JSC::JSObject *WebCore::JSEventListener::jsFunction(WebCore::ScriptExecutionContext &) const
1   0x2b9f83fd9 WTFCrash
2   0x2a800c24b WTFCrashWithInfo(int, char const*, char const*, int)
3   0x2a9e94ca0 WebCore::JSEventListener::jsFunction(WebCore::ScriptExecutionContext&) const
4   0x2a9e9411b WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&)

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