231586 2021-10-12 09:41:43 -0700 [ iOS ] http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-without-interaction.py is a flaky failure 2021-10-21 09:50:06 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build iPhone / iPad Unspecified RESOLVED INVALID InRadar P2 Normal --- 1 ayumi_kojima webkit-unassigned achristensen cdumez katherine_cheney webkit-bot-watchers-bugzilla webkit-bug-importer wilander oldest_to_newest 1803185 0 ayumi_kojima 2021-10-12 09:41:43 -0700 http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-without-interaction.py Is a flaky failure on iOS (15). History: https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2FresourceLoadStatistics%2Fswitch-session-on-navigation-to-prevalent-without-interaction.py Result page: https://build.webkit.org/results/Apple-iPadOS-15-Simulator-Debug-WK2-Tests/r283966%20(61)/results.html Diff: --- /Volumes/Data/worker/ipados-simulator-15-debug-tests-wk2/build/layout-test-results/http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-without-interaction-expected.txt +++ /Volumes/Data/worker/ipados-simulator-15-debug-tests-wk2/build/layout-test-results/http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-without-interaction-actual.txt @@ -5,8 +5,9 @@ PASS Should have and has the session cookie. PASS Should have and has the persistent cookie. -PASS Origin has isolated session. +FAIL Origin has no isolated session. PASS successfullyParsed is true +Some tests failed. TEST COMPLETE 1803186 1 webkit-bug-importer 2021-10-12 09:43:54 -0700 <rdar://problem/84151527> 1803188 2 ayumi_kojima 2021-10-12 09:48:44 -0700 Marked test expectations https://trac.webkit.org/changeset/283989/webkit 1803216 3 ayumi_kojima 2021-10-12 10:34:37 -0700 I was not able to reproduce the failure locally using run-webkit-tests --ios-simulator --iterations 50 --exit-after-n-failures 1 http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-without-interaction.py --force 1803304 4 cdumez 2021-10-12 12:23:32 -0700 Based on the Apache Access log, I think we fail on step 1: case "#step1": setSessionCookie(); setPersistentCookie(); checkCookies(true, true); if (testRunner.hasStatisticsIsolatedSession(prevalentOrigin)) testPassed("Origin has isolated session."); else { testFailed("Origin has no isolated session."); setEnableFeature(false, finishJSTest); } document.location.href = nonPrevalentOrigin + "/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-without-interaction.py#step2"; break; I am unclear why the session would not be recognized as isolated, since sessions are isolated unconditionally nowadays. I could only see 2 reasons: 1. We have not done any loads for that origin yet. This seems unlikely since the origin in question is "http://127.0.0.1:8000" and we should have just loaded the main resource of the test from this origin. 2. Something is clearing the isolated session. I do see there is a NetworkSessionCocoa::clearIsolatedSessions() for e.g. 1803476 5 cdumez 2021-10-12 15:29:13 -0700 I haven't been able to reproduce on iOS simulator so far and I currently don't have any idea of how this could fail. 1807223 6 cdumez 2021-10-21 09:50:06 -0700 This test no longer exists. It was reverted.