[Webkit-unassigned] [Bug 196096] Many failures caused by async overflow scrolling weren't caught by EWS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196096

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
(In reply to Alexey Proskuryakov from comment #1)
> Wow, much clickbait! Re-titling.
> 
> The crashes in post-commit are debug assertions, so those are expected to
> not show up in release mode.

The crash (assertion) is explained in bug 196123.

> I checked the logs on the EWS bot, and there was absolutely nothing
> interesting there, the tests just plain passed:
> 
> 2019-03-20 12:22:25,295 - Running: webkit-patch
> --status-host=webkit-queues.webkit.org --bot-id=ews124 build-and-test
> --no-clean --no-update --test --non-interactive --build-style=release
> --group=None --port=ios-simulator-wk2
> 2019-03-20 12:33:20,915 - Passed tests
> 
> Simon, what was the reason for the failures, and why was it hidden from EWS?

The failure were legitimate test failures caused by differences in clipping and box sizes when elements with overflow:scroll were composited. They affected iOS WK2 tests, both release and debug. The patch should have absolutely caused these failures.

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