Bug 198661 - Layout Test landed flaky [ Mojave WK2 ] scrollingcoordinator/mac/nested-sticky.html is a flaky ImageOnlyFailure and Timeout
Summary: Layout Test landed flaky [ Mojave WK2 ] scrollingcoordinator/mac/nested-stick...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Tools / Tests (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
URL:
Keywords: InRadar
Depends on:
Blocks:
 
Reported: 2019-06-07 09:04 PDT by Shawn Roberts
Modified: 2019-06-07 09:14 PDT (History)
7 users (show)

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Description Shawn Roberts 2019-06-07 09:04:06 PDT 
The following layout test is flaky on Mojave WK2 Debug and Release

scrollingcoordinator/mac/nested-sticky.html

Probable cause:

Test is more flaky on Debug runs. Test was added in r244630 and appears to have been flaky its entire available history on the dashboard. 

The ImageOnlyFailure's appear to only happen on Debug runs. Cannot reproduce them on Release builds, but the Release timeout is reproducible just as easily on Release builds.

Reproducible with:

run-webkit-tests scrollingcoordinator/mac/nested-sticky.html --iter 100 -f --debug

Will average aboutt 3 reference mismatches and 4 timeouts be 100 iteration run. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=scrollingcoordinator%2Fmac%2Fnested-sticky.html
Comment 1 Radar WebKit Bug Importer 2019-06-07 09:04:47 PDT 
<rdar://problem/51523533>
Comment 2 Shawn Roberts 2019-06-07 09:13:19 PDT 
Marked flaky in https://trac.webkit.org/changeset/246202/webkit