RESOLVED FIXED306557
REGRESSION(306415@main): [Tahoe arm] fast/css-grid-layout/grid-painting-item-overflow.html is a flaky image failure. 
https://bugs.webkit.org/show_bug.cgi?id=306557
Summary REGRESSION(306415@main): [Tahoe arm] fast/css-grid-layout/grid-painting-item-...
Diego De La Toba
Reported 2026-01-29 11:20:59 PST
fast/multicol/newmulticol/remove-spanner1.html is a flakey image failure only on Tahoe MacOS arm. Regression is at 306415@main, verified via bisection. HISTORY: https://results.webkit.org/?suite=layout-tests&test=fast%2Fcss-grid-layout%2Fgrid-painting-item-overflow.html IMAGE URL: https://build.webkit.org/results/Apple-Tahoe-Release-AppleSilicon-WK2-Tests/306415@main%20(1335)/fast/css-grid-layout/grid-painting-item-overflow-diffs.html IMAGES: See attached. STEPS TO REPRODUCE: I was able to reproduce this failure at macOS Tahoe ToT running the test as follows: run-webkit-tests --release --no-retry --force --iterations 2000 fast/multicol/newmulticol/remove-spanner1.html I am going to mark expectations as pass fail while this pends investigation.
Attachments
Image Diff (29.98 KB, application/zip)
2026-01-29 11:27 PST, Diego De La Toba 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2026-01-29 11:21:07 PST
<rdar://problem/169199733>
Diego De La Toba
Comment 2 2026-01-29 11:27:32 PST
Created attachment 478194 [details] Image Diff
Diego De La Toba
Comment 3 2026-01-29 11:48:05 PST
Pull request: https://github.com/WebKit/WebKit/pull/57500
EWS
Comment 4 2026-01-29 13:36:52 PST
Committed 306442@main (fcc48d035966): <https://commits.webkit.org/306442@main> Reviewed commits have been landed. Closing PR #57500 and removing active labels.
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