[Webkit-unassigned] [Bug 219008] New: REGRESSION: [ Mac ] imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe-network-error.sub.html is flaky failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219008

            Bug ID: 219008
           Summary: REGRESSION: [ Mac ]
                    imported/w3c/web-platform-tests/html/semantics/embedde
                    d-content/the-iframe-element/iframe-network-error.sub.
                    html is flaky failing
           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: tsavell at apple.com

imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe-network-error.sub.html

This test is failing flakily on Mac. 

History:
https://results.webkit.org/?suite=layout-tests&test=webgpu%2Fwhlsl%2Fdont-crash-parsing-enum.html

Diff:
--- /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe-network-error.sub-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe-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'.


I am able to reproduce this test using command:
run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe-network-error.sub.html

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