Bug 309962

Summary: [threaded-animations] remote timeline is not preserved in update for animation targeting primary and backdrop layers
Product: WebKit Reporter: Antoine Quint <graouts>
Component: AnimationsAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: graouts, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Antoine Quint
Reported 2026-03-14 13:45:31 PDT
If an animation targets both the primary and backdrop layers for an element, updating that animation will crash the UI process because we're hitting `RELEASE_ASSERT(timeline, "Remote layer tree animations should have a pre-registered timeline.")` in `RemoteLayerTreeNode::setAcceleratedEffectsAndBaseValues()`.
Attachments
Antoine Quint
Comment 1 2026-03-14 13:45:41 PDT
Antoine Quint
Comment 2 2026-03-14 14:01:06 PDT
EWS
Comment 3 2026-03-14 17:38:21 PDT
Committed 309277@main (9ca97ba47fc5): <https://commits.webkit.org/309277@main> Reviewed commits have been landed. Closing PR #60639 and removing active labels.
EWS
Comment 4 2026-03-14 22:11:41 PDT
Committed 305413.481@safari-7624-branch (c26ef46a3ebb): <https://commits.webkit.org/305413.481@safari-7624-branch> Reviewed commits have been landed. Closing PR #4717 and removing active labels.
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