[Webkit-unassigned] [Bug 227998] New: [Mac OS & iOS] imported/w3c/web-platform-tests/html/semantics/embedded-content/the-embed-element/embed-network-error.sub.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227998

            Bug ID: 227998
           Summary: [Mac OS & iOS]
                    imported/w3c/web-platform-tests/html/semantics/embedde
                    d-content/the-embed-element/embed-network-error.sub.ht
                    ml 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/html/semantics/embedded-content/the-embed-element/embed-network-error.sub.html 

Is flaky failing on Mac OS and iOS 14 E Simulator wk2

History: https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fsemantics%2Fembedded-content%2Fthe-embed-element%2Fembed-network-error.sub.html

I was able to reproduce the failure on my local machine using run-webkit-tests imported/w3c/web-platform-tests/html/semantics/embedded-content/the-embed-element/embed-network-error.sub.html --iterations 500 --exit-after-n-failures 2 -f

I was not able to reproduce the failure on iOS using:

run-webkit-tests imported/w3c/web-platform-tests/html/semantics/embedded-content/the-embed-element/embed-network-error.sub.html --iterations 500 --exit-after-n-failures 2 -f --ios-simulator

run-webkit-tests imported/w3c/web-platform-tests/html/semantics/embedded-content/the-embed-element/embed-network-error.sub.html --iterations 50 --exit-after-n-failures 2 -f --ios-simulator --child-process=4

Diff: 

--- /Volumes/Data/worker/bigsur-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/embedded-content/the-embed-element/embed-network-error.sub-expected.txt
+++ /Volumes/Data/worker/bigsur-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/embedded-content/the-embed-element/embed-network-error.sub-actual.txt
@@ -1,6 +1,6 @@
+Blocked access to external URL http://nonexistent.localhost/
 Blocked access to external URL http://nonexistent.localhost/
 CONSOLE MESSAGE: Refused to display 'http://localhost:8800/html/semantics/embedded-content/resources/not-embeddable.html' in a frame because it set 'X-Frame-Options' to 'deny'.
-Blocked access to external URL http://nonexistent.localhost/
 CONSOLE MESSAGE: Refused to display 'http://localhost:8800/html/semantics/embedded-content/resources/not-embeddable.html' in a frame because it set 'X-Frame-Options' to 'deny'.

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