Bug 264111

Summary:	[WebGPU] Buffer synchronization is implemented incorrectly leading to data races between the CPU and GPU
Product:	WebKit	Reporter:	Mike Wyrzykowski <mwyrzykowski>
Component:	WebGPU	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Other
Hardware:	Unspecified
OS:	Unspecified

Description Mike Wyrzykowski 2023-11-02 12:59:29 PDT

[WebGPU] Buffer synchronization is implemented incorrectly leading to data races between the CPU and GPU

Specifically, calling GPUCommandEncoder.copyXToBuffer() and then mapping the buffer contents returns the pointer, but the copy command may still be in flight.

This leads to data races

Comment 1 Radar WebKit Bug Importer 2023-11-02 12:59:44 PDT

<rdar://problem/117869389>

Comment 2 Mike Wyrzykowski 2023-11-03 00:21:41 PDT

Pull request: https://github.com/WebKit/WebKit/pull/19938

Comment 3 EWS 2023-11-03 12:14:34 PDT

Committed 270195@main (1ab3947e3854): <https://commits.webkit.org/270195@main>

Reviewed commits have been landed. Closing PR #19938 and removing active labels.