Bug 208018

Summary:	[ iOS wk2 Release ] perf/clone-with-focus.html is flaky failing.
Product:	WebKit	Reporter:	Jason Lawrence <Lawrence.j>
Component:	New Bugs	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	iPhone / iPad
OS:	iOS 13
See Also:	https://bugs.webkit.org/show_bug.cgi?id=170393

Description Jason Lawrence 2020-02-20 10:57:36 PST

perf/clone-with-focus.html

Description:
This test is flaky failing throughout the visible history. The oldest failing test is at r255367, the oldest passing showing is r255359.

History:
https://results.webkit.org/?suite=layout-tests&test=perf%2Fclone-with-focus.html&platform=ios&style=release&limit=50000

Diff:
--- /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/perf/clone-with-focus-expected.txt
+++ /Volumes/Data/slave/ios-simulator-13-release-tests-wk2/build/layout-test-results/perf/clone-with-focus-actual.txt
@@ -1,2 +1,2 @@
 
-PASS. Cloning elements takes roughly as long with as without focus.
+FAIL. Cloning 1000 elements with focus took 7ms, without took 2ms.

Comment 1 Radar WebKit Bug Importer 2020-02-20 10:57:57 PST

<rdar://problem/59635503>

Comment 2 Jason Lawrence 2020-02-20 11:06:19 PST

I have marked this test as failing while this issue is investigated.
https://trac.webkit.org/changeset/257070/webkit

Comment 3 Jason Lawrence 2020-02-20 11:08:00 PST

I can reproduce this issue with r257062 by running the command below.
run-webkit-tests perf/clone-with-focus.html --iterations 3000 --exit-after-n-failures 5 -f --force --ios-simulator

[12/3000] perf/clone-with-focus.html failed unexpectedly (text diff)
[19/3000] perf/clone-with-focus.html failed unexpectedly (text diff)
[27/3000] perf/clone-with-focus.html failed unexpectedly (text diff)
[34/3000] perf/clone-with-focus.html failed unexpectedly (text diff)
[36/3000] perf/clone-with-focus.html failed unexpectedly (text diff)
Exiting early after 5 failures. 34 tests run.

29 tests ran as expected, 5 didn't (2966 didn't run):