Okay, I have a pass for that chip (webgpu7) now. So there's something intermittent here, unfortunately.
Bug 1910150 Comment 12 Edit History
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Okay, I have a pass for that chip (webgpu7) now. So there's something intermittent here, unfortunately. Comparing the run that timed out with the successful runs, it seems like all the tests did actually run and pass, but then something caused the browser to not exit when the test was done.