Bug 240918 – REGRESSION (~2022-02-24): [ iOS Debug ] Two fast/loader/ tests are a flaky failure

• Status: NEW
• Component: New Bugs

[Karl Rackler]

Description:
fast/loader/create-frame-in-DOMContentLoaded.html
fast/loader/user-style-sheet-resource-load-callbacks.html

The first failure that I saw on the dashboard was on 4/1/2022 at r292236, but this does not appear relevant to causing this issue.   This test has been flaky for its entire history on the dashboard.

History:
https://results.webkit.org/?platform=ios&style=debug&limit=50000&suite=layout-tests&suite=layout-tests&test=fast%2Floader%2Fcreate-frame-in-DOMContentLoaded.html&test=fast%2Floader%2Fuser-style-sheet-resource-load-callbacks.html

Diff:
--- /Volumes/Data/worker/Apple-iOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/fast/loader/create-frame-in-DOMContentLoaded-expected.txt
+++ /Volumes/Data/worker/Apple-iOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/fast/loader/create-frame-in-DOMContentLoaded-actual.txt
@@ -2,4 +2,3 @@
 C) Entered load event handler function.
 D) Exiting load event handler function.
 Test passed if messages A, B, C, D were all in order and there was no crash.
-B) Exiting DOMContentLoaded event handler function.


--- /Volumes/Data/worker/Apple-iOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/fast/loader/user-style-sheet-resource-load-callbacks-expected.txt
+++ /Volumes/Data/worker/Apple-iOS-15-Simulator-Debug-WK2-Tests/build/layout-test-results/fast/loader/user-style-sheet-resource-load-callbacks-actual.txt
@@ -1 +1,2 @@
+user-style-sheet-resource-load-callbacks.html - didFinishLoading
 This tests that no delegate methods are sent for the user style sheet. No stylesheet load messages should be dumped.

[Radar WebKit Bug Importer]

<rdar://problem/93918602>

[Karl Rackler]

I have marked this test as a flaky failure while this issue is investigated.

[Karl Rackler]

Pull request: https://github.com/WebKit/WebKit/pull/1021

[EWS]

Test gardening commit r294817 (250970@main): <https://commits.webkit.org/250970@main>

Reviewed commits have been landed. Closing PR #1021 and removing active labels.

[Alexey Proskuryakov]

This is definitely a regression, but the first failure I see in history for both tests is on 2022-02-24, 247740@main. It's infrequent, so this revision is definitely not the culprit.