Bug 257173

Summary:	MachSendRights can release their IOSurface use-counts before CA adds a new ones
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Matt Woodrow 2023-05-22 17:23:46 PDT

CoreAnimation doesn't add a new use-count to CAIOSurfaces until the transaction is committed, which is after the MachSendRight (inside LayerTreeTransaction/RemoteLayerBackingStoreProperties) is destroyed.

We should run an explicit CATransaction for layer tree commits to ensure that we always have a use-count added.

Comment 1 Radar WebKit Bug Importer 2023-05-22 17:23:57 PDT

<rdar://problem/109687766>

Comment 2 Matt Woodrow 2023-05-22 17:29:13 PDT

Pull request: https://github.com/WebKit/WebKit/pull/14222

Comment 3 EWS 2023-05-26 20:48:32 PDT

Committed 264617@main (a59adccf52b4): <https://commits.webkit.org/264617@main>

Reviewed commits have been landed. Closing PR #14222 and removing active labels.