[Webkit-unassigned] [Bug 218859] New: REGRESSION(r269579) [WPE] Many tests with scrolling flaky after this revision

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218859

            Bug ID: 218859
           Summary: REGRESSION(r269579) [WPE] Many tests with scrolling
                    flaky after this revision
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lmoura at igalia.com

Many tests are flaky with blank images either in the actual.png or expected.png. In some cases, it fails both runs and happen to  be registered as failure.

Link to first test run with the flakies: https://build.webkit.org/builders/WPE-Linux-64-bit-Release-Tests/builds/20967

Testing locally, the issue is reproducible most of the time (>80% here) with the following command:

./Tools/Scripts/run-webkit-tests --verbose --debug-rwt-logging --no-retry-failures --no-new-test-results --no-build --no-show-results --clobber-old-results --display-server=xvfb --results-directory layout-test-results --release --wpe fast/css/sticky/inflow-sticky.html

Also, running only on fast/css/sticky/, the following 3 tests (that use window.scrollTo) fail:

  fast/css/sticky/inflow-sticky.html
  fast/css/sticky/inline-sticky-abspos-child.html
  fast/css/sticky/sticky-both-sides.html

One complication is that it seems to depend on the hardware, as Chris could not reproduce it on his desktop but only on his laptop.

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