RESOLVED FIXED307446
[threaded-animations] multiple View Transitions tests crash with "Threaded Time-based Animations" enabled 
https://bugs.webkit.org/show_bug.cgi?id=307446
Summary [threaded-animations] multiple View Transitions tests crash with "Threaded Ti...
Antoine Quint
Reported 2026-02-10 09:26:09 PST
The enablement PR for "Threaded Time-based Animations" PR at https://github.com/WebKit/WebKit/pull/57620 identified that these tests crash in debug builds on macOS: - http/wpt/css/css-view-transitions/navigation/cross-origin-bfcache.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/at-rule-in-layer-cascade-external-stylesheet.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/at-rule-in-layer-cascade.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/at-rule-in-layer.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/at-rule-in-matching-media.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/at-rule-opt-in-change-with-script.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pagereveal-microtask-sequence.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pagereveal-updatecallbackdone-promise.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pagereveal-with-view-transition.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/pageswap-replace-navigation.html - imported/w3c/web-platform-tests/css/css-view-transitions/navigation/with-types/types-in-pagereveal-and-pageswap.html - imported/w3c/web-platform-tests/css/css-view-transitions/style-inheritance.html - swipe/swipe-disables-view-transition.html They all crash because of the same failed `willBeComposited == needsToBeComposited(layer, queryData)` assertion under `RenderLayerCompositor::computeCompositingRequirements()`.
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Radar WebKit Bug Importer
Comment 1 2026-02-10 09:26:16 PST
<rdar://problem/170065802>
Antoine Quint
Comment 2 2026-02-10 09:48:12 PST
Pull request: https://github.com/WebKit/WebKit/pull/58309
EWS
Comment 3 2026-02-10 11:37:26 PST
Committed 307197@main (24fe4db710ae): <https://commits.webkit.org/307197@main> Reviewed commits have been landed. Closing PR #58309 and removing active labels.
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