[Webkit-unassigned] [Bug 202852] New: http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-with-interaction-database.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202852

            Bug ID: 202852
           Summary: http/tests/resourceLoadStatistics/switch-session-on-na
                    vigation-to-prevalent-with-interaction-database.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: Katherine_cheney at apple.com

The following layout test is a flaky timeout on macOS WK2 and iOS wk2:

http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-with-interaction-database.html 

Reproducible with:

run-webkit-tests http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-with-interaction-database.html --iterations 2

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2FresourceLoadStatistics%2Fswitch-session-on-navigation-to-prevalent-with-interaction-database.html%20

Diff:
--- /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-with-interaction-expected.txt
+++ /Volumes/Data/slave/highsierra-debug-tests-wk2/build/layout-test-results/http/tests/resourceLoadStatistics/switch-session-on-navigation-to-prevalent-with-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


Probable cause:

The failures are fixed locally when I clear the NetworkLoad cache and all pending write operations in between the tests. I think this is because clearIsolatedSessions() is called between tests, but a new isolated session is only added with a call to startNetworkLoad() in the NetworkResourceLoader, which doesn't happen if the resource is in the cache. 

Before posting a fix, my questions are:

1. Should the clear() function in the cache also be clearing pending write operations? (I had to do it manually)
2. Should the cache be cleared between tests automatically?
3. The entry in the cache was being stored with a "#step4" on the end of it, is this expected behavior?

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