[Webkit-unassigned] [Bug 193935] New: Layout Test performance-api/performance-observer-callback-after-gc.html is flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193935

            Bug ID: 193935
           Summary: Layout Test
                    performance-api/performance-observer-callback-after-gc
                    .html is flaky
           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 Mojave Debug

performance-api/performance-observer-callback-after-gc.html

Probable cause:

Test is flaky on every debug build I have tested from 2299992 to current. Causing failures approximately 1/500 to 4/500 of the time using the following command: 

run-webkit-tests --root debug- performance-api/performance-observer-callback-after-gc.html --iterations 500 -f --debug

Flakiness Dashboard:

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

Diff:

--- /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/performance-api/performance-observer-callback-after-gc-expected.txt
+++ /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/performance-api/performance-observer-callback-after-gc-actual.txt
@@ -3,9 +3,8 @@
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


-PerformanceObserver callback fired: 1 entries
+PerformanceObserver callback fired: 3 entries
 PASS mark1
-PerformanceObserver callback fired: 2 entries
 PASS mark2
 PASS mark3
 PASS successfullyParsed is true

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