[Webkit-unassigned] [Bug 103468] [EFL][WK2] Regression(135935) layout tests snapshots are flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103468


Jussi Kukkonen (jku) <jussi.kukkonen at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[EFL][WK2]                  |[EFL][WK2]
                   |Regression(135935) layout   |Regression(135935) layout
                   |tests snapshot are          |tests snapshots are flaky
                   |incorrect                   |




--- Comment #3 from Jussi Kukkonen (jku) <jussi.kukkonen at intel.com>  2012-12-14 07:26:52 PST ---
(In reply to comment #1)
> This is not just about updating results. The tests seem to all be flaky now. Original bug is bug 102833

I'll just update the current status here:

We have more than 500 tests that are flaky -- I'm guessing all ref tests are, some are just more flaky than others. The build seems to affect this as well as media tests are flaky on Release but not on Debug.

I've seen a couple of different failures: one had correct looking rendering but it seemed as if it had scrolled 100px to the left or up. Other times (quite often) the rendering was empty.

One example of the empty rendering is fast/forms/input-first-letter-edit.html: I can fairly reliably get that to fail, but only with a slightly modified test runner script.

There was one bug found already (bug 103641) where a window resize broke all the tests in the same worker. The remaining tests do not fail with a similar pattern though: I does not seem like any single test makes other tests fail.

I've looked at the patch and the snapshotting code, and I just cannot understand what goes wrong.

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