[Webkit-unassigned] [Bug 66735] New: Composited layers are sometimes created during painting after layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66735

           Summary: Composited layers are sometimes created during
                    painting after layout
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: enne at google.com
                CC: simon.fraser at apple.com, jamesr at chromium.org


In the Chromium GPU tests, it looks like compositing/geometry/limit-layer-bounds-transformed-overflow has started triggering the assertions that no layers are created after painting starts.  Unfortunately, this happens intermittently and only when other tests are running, so it's unclear what the actual source of the problem is.  I'm filing this bug as a reminder to take a look at this when I or somebody else gets a chance.

See: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=compositing%2Fgeometry%2Flimit-layer-bounds-transformed-overflow.html&showExpectations=true&group=%40ToT%20GPU%20Mesa%20-%20chromium.org

This can be seen locally in Chromium by reverting the patch in https://bugs.webkit.org/show_bug.cgi?id=66731 to reintroduce these asserts.

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