Bug 171947 – LayoutTest/transitions/extra-transition.html is flaky

• Status: RESOLVED
• Resolution: FIXED
• Component: Animations

[Matt Lewis]

The test transitions/extra-transition.html is a flaky failure.

The test started failing on Sierra Release on 5/8/2017
I'm unsure if this is related but this revision was added when Sierra Debug wk1 failed the first time on dashboard and deals with transitions: 
https://trac.webkit.org/changeset/216411/webkit

History:
https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=transitions%2Fextra-transition.html

Build:
https://build.webkit.org/builders/Apple%20Sierra%20Release%20WK2%20(Tests)/builds/1354
https://build.webkit.org/results/Apple%20Sierra%20Release%20WK2%20(Tests)/r216604%20(1354)/results.html

Diff:
--- /Volumes/Data/slave/sierra-release-tests-wk2/build/layout-test-results/transitions/extra-transition-expected.txt
+++ /Volumes/Data/slave/sierra-release-tests-wk2/build/layout-test-results/transitions/extra-transition-actual.txt
@@ -1,3 +1,3 @@
 Spaces lets you group your application windows and banish clutter completely. Leopard gives you a space for everything and makes it easy to switch between your spaces. Start by simply clicking the Spaces icon in the Dock.
-transform="matrix(1, 0, 0, 1, 100, 0)" as expected: PASS
+transform="matrix(1, 0, 0, 1, 55.92744445800781, 0)", expected "matrix(1, 0, 0, 1, 100, 0)": FAIL

[Matt Lewis]

Marked test as flaky on Sierra Release WK2
https://trac.webkit.org/changeset/216624/webkit/

[Alexey Proskuryakov]

This definitely is a regression, however on internal bots, it started on 2017-04-29. There was also one failure on GuardMalloc on 2017-04-22, but it was isolated, and I can't confirm if the diff looked the same.

Curiously, all internal failures are on WebKit1. This may be some test dependency issue (either about preceding tests, or about tests running in parallel).

Dean, Simon, should this be looked into as a regression, or is it just some general inconsequential transition test flakiness?

> Marked test as flaky on Sierra Release WK2

Please update the expectation to apply to all OS versions, and to WebKit1.

[Nikolas Zimmermann]

It is also flaky on Gtk, see https://build.webkit.org/builders/GTK%20Linux%2064-bit%20Release%20%28Tests%29/builds/11947/steps/layout-test/logs/stdio.
Will update gtk expectations.

[EWS]

Committed 274860@main (aaf812a078dd): <https://commits.webkit.org/274860@main>

Reviewed commits have been landed. Closing PR #24607 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/123106948>

[Ahmad Saleem]

*** Bug 168076 has been marked as a duplicate of this bug. ***