[Webkit-unassigned] [Bug 251107] [GTK][WPE] WebGL2 failures for GTK and WPE ports

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251107

--- Comment #4 from Carlos Alberto Lopez Perez <clopez at igalia.com> ---
We continue to have issues regarding this.

Some WebGL2 tests exhibit a flakiness behavior that make the EWS give false positives.

The EWS does this:

1. Run layout tests with patch and annotate the failures 
2. Repeat each failure from 1. 10 times and annotate the ones that failed the 10 times, so not even once they passed-
3. Build WebKit without patch and run 10 times the ones that failed on 2. the 10 times.
4. Report as new failures the tests that passed 10 times without patch but failed 10 times with it.

So it is highly unlikely that a flaky tests can be a "false positive". Assuming a randomness factor of x% the odds of hitting 10 hits and 10 fails in a round are pretty low.

Yet this WebGL tests manage to do that.

I suspect it can be related to something on the graphic driver state that once activated makes it fail continuously.

Example of the issue, see the GTK bot runs on: https://github.com/WebKit/WebKit/pull/14386

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