[Webkit-unassigned] [Bug 225671] [ BigSur Release wk2 arm64 ] webgl/2.0.0/conformance2/textures/image_bitmap_from_image_data/tex-2d-rgba16f-rgba-float.html (layout-test) is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225671

--- Comment #7 from Jonathan Bedard <jbedard at apple.com> ---
(In reply to Alexey Proskuryakov from comment #6)
> Jonathan, do you know what this output means? This almost certainly wasn't a
> real crash (I also verified that there isn't a crash log in
> ~/Library/Logs/DiagnosticReports on the bot).
> 
> 07:48:29.898 21802 com.apple.WebKit.WebContent.Development crash, pid = 33213
> 07:48:29.960 21802 This test marked as a crash because of no data while
> reading stdout for the server process.
> 07:48:29.960 21802 This test marked as a crash because of no data while
> reading stdout for the server process.
> 07:49:00.021 21802 worker/1
> webgl/2.0.0/conformance2/textures/image_bitmap_from_image_data/tex-2d-
> rgba16f-rgba-float.html crashed, (no stderr)

Another way to say this is "the process was unresponsive". We've always put this in the crash bucket, but it's not a true crash, it means that run-webkit-tests got absolutely no output from WebKitTestRunner. The exact rationale as to why we added this is before my time, but it's not something we often encounter, usually timeouts give some output before hanging. Looking at the test name, I wonder if an image diff test that times out doesn't produce any output, it seems plausible that an image diff test timing out is not a case we've dealt with frequently enough to correctly categorize

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