[Webkit-unassigned] [Bug 196298] New: [ iOS Sim WK2 ] Layout Test fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196298

            Bug ID: 196298
           Summary: [ iOS Sim WK2 ] Layout Test
                    fast/viewport/ios/use-minimum-device-width-for-page-wi
                    thout-viewport-meta.html 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 failing on iOS Simulator Release WK2

fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html

Probable cause:

Test has been a flaky failure since the test was added in https://trac.webkit.org/changeset/238946/webkit . Failing around 4 times on average in 500 iterations from r238946 up until r240911

Changes made in https://trac.webkit.org/changeset/240912/webkit made test fail a lot more frequently. During testing found from 240912 up until current r243537 is failing approximately 10 times 60 attempts (setting testing to exit after 10 failures)

Reproduced with : 

run-webkit-tests fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta.html --iterations 500 -f --ios-simulator --exit-after-n-failures=10

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fviewport%2Fios%2Fuse-minimum-device-width-for-page-without-viewport-meta.html

--- /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta-expected.txt
+++ /Volumes/Data/slave/ios-simulator-12-release-tests-wk2/build/layout-test-results/fast/viewport/ios/use-minimum-device-width-for-page-without-viewport-meta-actual.txt
@@ -1,7 +1,7 @@
 setMinimumEffectiveWidth(640.00)
-window size: [640, 1096]
+window size: [320, 548]
 square size: [64, 110]
-zoom scale: 0.50
+zoom scale: 1.00

 setMinimumEffectiveWidth(768.00)
 window size: [768, 1315]

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