[Webkit-unassigned] [Bug 197285] New: REGRESSION (~244100) [Mac WK2 Debug] Layout Test http/tests/resourceLoadStatistics/prune-statistics.html is a flaky failure

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Apr 25 09:43:28 PDT 2019


https://bugs.webkit.org/show_bug.cgi?id=197285

            Bug ID: 197285
           Summary: REGRESSION (~244100) [Mac WK2 Debug] Layout Test
                    http/tests/resourceLoadStatistics/prune-statistics.htm
                    l is a flaky failure
           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 WK2 Debug

http/tests/resourceLoadStatistics/prune-statistics.html

Probable cause:

Unable to reproduce it locally running with 1 child process or even in full parallel. Test had similar flaky behavior before and was fixed in https://trac.webkit.org/changeset/233888/webkit

Around r244100 it started to fail flakily.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2FresourceLoadStatistics%2Fprune-statistics.html

Diff:

--- /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/http/tests/resourceLoadStatistics/prune-statistics-expected.txt
+++ /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/http/tests/resourceLoadStatistics/prune-statistics-actual.txt
@@ -1,3 +1,7 @@
+FAIL: Tried to install a second TestRunner callback for the same event (id 11)
+
+FAIL: Tried to install a second TestRunner callback for the same event (id 19)
+
 Tests that statistics are pruned in the right order.

 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
@@ -5,13 +9,13 @@

 PASS Test iteration 1 passed.
 PASS Test iteration 2 passed.
+FAIL checkIfPrevalent: Test iteration 3 failed. http://127.0.0.3:8000/temp was prevalent
+FAIL checkIfPrevalentAccordingToInitialExpectation: Test iteration 3 failed. http://127.0.0.4:8000/temp wasn't prevalent
+FAIL checkIfPrevalentAccordingToInitialExpectation: Test iteration 3 failed. http://127.0.0.7:8000/temp wasn't prevalent
+FAIL checkIfPrevalentAccordingToInitialExpectation: Test iteration 3 failed. http://127.0.0.8:8000/temp wasn't prevalent
 PASS Test iteration 3 passed.
-PASS Test iteration 4 passed.
-PASS Test iteration 5 passed.
-PASS Test iteration 6 passed.
-PASS Test iteration 7 passed.
-PASS Test iteration 8 passed.
 PASS successfullyParsed is true
+Some tests failed.

 TEST COMPLETE

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