Bug 307377

Summary: [Tahoe Release arm64] compositing/webgl/update-composited-canvas-layer.html is a flaky image diff
Product: WebKit Reporter: Diego De La Toba <d_delatoba>
Component: WebGLAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: ap, djg, jbedard, kbr, kkinnunen, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
image diff none

Diego De La Toba
Reported 2026-02-09 15:38:05 PST
compositing/webgl/update-composited-canvas-layer.html is a flaky image diff on macOS Tahoe arm64. HISTORY: https://results.webkit.org/?suite=layout-tests&test=compositing%2Fwebgl%2Fupdate-composited-canvas-layer.html&version_name=Tahoe&style=release&architecture=arm64&recent=false IMAGE URL: https://build.webkit.org/results/Apple-Tahoe-Release-AppleSilicon-WK2-Tests/307099%40main%20(1543)/compositing/webgl/update-composited-canvas-layer-diffs.html IMAGES: See attached. REPRODUCTION: I was able to reproduce this on macOS Tahoe ToT with the following: rwt --force --release --no-retry —exit-after-n-failures=5 --iterations 2000 compositing/webgl/update-composited-canvas-layer.html reproduce it I am going to mark expectations as ImageOnlyFailure Pass while this pends investigation
Attachments
image diff (6.97 KB, application/zip)
2026-02-09 17:04 PST, Diego De La Toba 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2026-02-09 15:38:11 PST
<rdar://problem/170007050>
Diego De La Toba
Comment 2 2026-02-09 15:55:04 PST
Pull request: https://github.com/WebKit/WebKit/pull/58248
Diego De La Toba
Comment 3 2026-02-09 16:45:57 PST
Pull request: https://github.com/WebKit/WebKit/pull/58257
EWS
Comment 4 2026-02-09 16:48:10 PST
Test gardening commit 307126@main (df15754afb74): <https://commits.webkit.org/307126@main> Reviewed commits have been landed. Closing PR #58257 and removing active labels.
Diego De La Toba
Comment 5 2026-02-09 17:04:11 PST
Created attachment 478296 [details] image diff
Jonathan Bedard
Comment 6 2026-02-11 14:20:46 PST
Looks like this test might actually crash ImageDiff: 10:21:04.791 31158 worker/8 Test marked as failed, ImageDiff crashed because of no data while reading stdout for the server process. 10:21:04.791 31158 worker/8 Test marked as failed, ImageDiff crashed because of no data while reading stdout for the server process. 10:21:04.791 31158 worker/8 compositing/webgl/update-composited-canvas-layer.html : ImageDiff produced stderr output: Error: test and reference images have different sizes. Test image is 784x588, reference image is 800x600 ImageDiff crashed 10:21:04.794 31158 worker/8 compositing/webgl/update-composited-canvas-layer.html failed:
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