Bug 240918

Summary:	REGRESSION (~2022-02-24): [ iOS Debug ] Two fast/loader/ tests are a flaky failure
Product:	WebKit	Reporter:	Karl Rackler <rackler>
Component:	New Bugs	Assignee:	Karl Rackler <rackler>
Status:	NEW ---
Severity:	Normal	CC:	achristensen, ap, cdumez, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Karl Rackler 2022-05-25 11:54:05 PDT

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.

Comment 1 Radar WebKit Bug Importer 2022-05-25 11:54:31 PDT

<rdar://problem/93918602>

Comment 2 Karl Rackler 2022-05-25 12:16:15 PDT

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

Comment 3 Karl Rackler 2022-05-25 12:18:56 PDT

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

Comment 4 EWS 2022-05-25 12:22:41 PDT

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

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

Comment 5 Alexey Proskuryakov 2022-05-30 19:23:52 PDT

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.