Bug 197068

Summary:	[ macOS Debug] Layout Test fast/selectors/matches-backtracking.html is a flaky timeout
Product:	WebKit	Reporter:	Shawn Roberts <sroberts>
Component:	Tools / Tests	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ayumi_kojima, lforschler, mmaxfield, webkit-bot-watchers-bugzilla, webkit-bug-importer, ysuzuki
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=221308 https://bugs.webkit.org/show_bug.cgi?id=230988

Description Shawn Roberts 2019-04-18 13:08:57 PDT

The following layout test is flaky on Mojave WK2 Debug

fast/selectors/matches-backtracking.html

Probable cause:

Test appears to have been a flaky timeout in its available history on the dashboard. However around r243800 it started to time out almost every single run.

Unable to reproduce locally. Test was marked slow https://bugs.webkit.org/show_bug.cgi?id=139634, Test was added in https://trac.webkit.org/changeset/175097/webkit

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=fast%2Fselectors%2Fmatches-backtracking.html

Comment 1 Shawn Roberts 2019-04-18 13:10:29 PDT

Adding Myles, incase https://trac.webkit.org/changeset/243828/webkit could have anything to do with this.

Adding Yusuke since he created the test. 

If anyone has any insight.

Comment 2 Radar WebKit Bug Importer 2019-04-23 08:59:15 PDT

<rdar://problem/50131405>

Comment 3 Shawn Roberts 2019-04-23 09:07:16 PDT

Updating test expectations in https://trac.webkit.org/changeset/244542/webkit while waiting for a fix.

Comment 4 ayumi_kojima 2021-10-28 11:05:33 PDT

fast/selectors/is-backtracking.html is now flaky timing out on macOS wk1 Debug as well. Updated test expectations https://trac.webkit.org/changeset/284992/webkit

Comment 5 Myles C. Maxfield 2021-10-28 16:37:10 PDT

The test just takes a long time. We should probably just split it into a bunch of different tests so each one can complete faster.

Comment 6 ayumi_kojima 2021-10-28 16:38:40 PDT

fast/selectors/matches-backtracking.html 

Updated test expectations https://trac.webkit.org/changeset/285006/webkit