[Webkit-unassigned] [Bug 161242] New: [GTK][Threaded Compositor] Several flaky tests

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Aug 26 06:53:25 PDT 2016


            Bug ID: 161242
           Summary: [GTK][Threaded Compositor] Several flaky tests
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org, clopez at igalia.com,
                    lforschler at apple.com

Even after fixing bug #160450 we still have a lot of laky tests sometimes in the bots. We no longer see the problem of scrollbars partially rendered, but we see scrollbars in some cases where they shouldn't be there at all (the contents are not bigger than the view size). That made me think that maybe there are tests leaving the view in an inconsistent state, most of the flaky tests are ref tests and all run by the same worker. But I tried to run all the tests using a single worker and I couldn't reproduce the problem so there must be something else. The other thing I can think of is that maybe in some cases the bot is more overloaded and a particular worker has less priority and things happen slower. We are still assuming that scheduling the task in the next loop iteration in the UI process after a force redraw ensures a redraw. The patch I initially posted in bug #160450 as a workaround tried to fix that assumption. I'm not sure that's the problem though, but we could try that patc

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