Bug 206947

Summary:	REGRESSION (r255338): [Catalina WK1] Multiple throttling layout tests became flaky
Product:	WebKit	Reporter:	Jacob Uphoff <jacob_uphoff>
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED CONFIGURATION CHANGED
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=206839

Description Jacob Uphoff 2020-01-29 10:30:23 PST

fast/dom/nested-timer-visible-element-throttling.html

along with multiple other tests under "throttling" re flaky failures

History: 
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=fast%2Fdom%2Fnested-timer-visible-element-throttling.html&test=fast%2Fdom%2Frepeating-timer-element-overflow-throttling.html&test=fast%2Fdom%2Frepeating-timer-element-overflowing-child-own-layer-throttling.html&test=fast%2Fdom%2Frepeating-timer-mixed-visible-display-none-elements-throttling.html&test=fast%2Fdom%2Frepeating-timer-visible-element-throttling.html&test=fast%2Fdom%2Ftimer-height-change-no-throttling.html&platform=mac

Diff: 

--- /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/fast/dom/nested-timer-visible-element-throttling-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/fast/dom/nested-timer-visible-element-throttling-actual.txt
@@ -6,9 +6,9 @@
 The timer should initially not be throttled.
 PASS internals.isTimerThrottled(timeoutId) is false
 5th iteration, timer should not have been throttled.
-PASS wasThrottled is false
+FAIL wasThrottled should be false. Was true.
 6th iteration, timer should still be unthrottled.
-PASS internals.isTimerThrottled(timeoutId) is false
+FAIL internals.isTimerThrottled(timeoutId) should be false. Was true.
 PASS successfullyParsed is true
 
 TEST COMPLETE

Comment 1 Radar WebKit Bug Importer 2020-01-29 10:30:41 PST

<rdar://problem/58996561>

Comment 2 Ryan Haddad 2020-01-29 10:52:42 PST

This started with:
REGRESSION (r255158): http/tests/frame-throttling/raf-throttle-in-cross-origin-subframe.html is a flaky failure
https://bugs.webkit.org/show_bug.cgi?id=206839
https://trac.webkit.org/changeset/255338/webkit

Comment 3 Ryan Haddad 2020-01-29 14:54:43 PST

Reverted r255338 for reason:

Introduced flakiness in multiple throttling layout tests

Committed r255388: <https://trac.webkit.org/changeset/255388>