[Webkit-unassigned] [Bug 202852] 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

--- Comment #5 from Chris Dumez <cdumez at apple.com> ---
(In reply to Chris Dumez from comment #4)
> (In reply to Katherine_cheney from comment #0)
> > 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. 
> 
> So how about you make sure this particular resource does not enter the disk
> cache by serving the "Cache-Control: no-store" HTTP header. It is pretty
> common in our tests.

See for e.g. LayoutTests/http/tests/misc/resources/random-no-store.php

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