[Webkit-unassigned] [Bug 229501] New: [ MacOs iOS EWS ] imported/w3c/web-platform-tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229501

            Bug ID: 229501
           Summary: [ MacOs iOS EWS ]
                    imported/w3c/web-platform-tests/IndexedDB/serialize-sh
                    aredarraybuffer-throws.https.html is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ayumi_kojima at apple.com

imported/w3c/web-platform-tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html

Is a flaky failure on iOS-14-Simulator-WK2-Tests-EWS and macOS-Catalina-Release-WK2-Tests-EWS.

The flaky failure is also showing up in the open source directory: https://results.webkit.org/?suite=layout-tests&test=imported/w3c/web-platform-tests/IndexedDB/serialize-sharedarraybuffer-throws.https.html

Result page: https://build.webkit.org/results/Apple-iPadOS-14-Simulator-Release-WK2-Tests/r281555%20(1898)/results.html

Diff:

--- /Volumes/Data/worker/ipados-simulator-14-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/IndexedDB/serialize-sharedarraybuffer-throws.https-expected.txt
+++ /Volumes/Data/worker/ipados-simulator-14-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/IndexedDB/serialize-sharedarraybuffer-throws.https-actual.txt
@@ -1,3 +1,5 @@
-
-FAIL IndexedDB: Attempting to serialize a SharedArrayBuffer should throw assert_true: The page is served with COOP and COEP, it should be cross-origin-isolated. expected true got false
-
+layer at (0,0) size 800x600
+  RenderView at (0,0) size 800x600
+layer at (0,0) size 800x600
+  RenderBlock {HTML} at (0,0) size 800x600
+    RenderBody {BODY} at (8,8) size 784x584

Looks like the flaky failure started at https://trac.webkit.org/changeset/281516/webkit.

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