[Webkit-unassigned] [Bug 161688] New: [GTK][Threaded Compositor] Several more flaky tests

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https://bugs.webkit.org/show_bug.cgi?id=161688

            Bug ID: 161688
           Summary: [GTK][Threaded Compositor] Several more flaky tests
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com
                CC: bugs-noreply at webkitgtk.org

Since we enabled threaded compositor, we now have a bunch of tests that occasionally pass when they usually fail. In build #18023 we have 84 unexpected passes, for example; that never happened before threaded compositor. What's interesting is these tests either always pass or always fail in a particular run of run-webkit-tests; they are clearly flaky, but they don't contribute to the flakiness count.

Carlos Garcia suggests in bug #161242#c20:

> I have theory, though. When they
> unexpectedly pass, they don't actually pass, we just fail to render both the
> actual and expected files in the same way (for example a fully white image
> in both cases). That's a problem of the reftests. So, more interesting to
> see what's failing, which can be also reproduced locally more easily, would
> be to see what we render when they pass.

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