[Webkit-unassigned] [Bug 190849] New: [macOS WK1] Layout Test http/tests/security/XFrameOptions/x-frame-options-multiple-headers-sameorigin-deny.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190849

            Bug ID: 190849
           Summary: [macOS WK1] Layout Test
                    http/tests/security/XFrameOptions/x-frame-options-mult
                    iple-headers-sameorigin-deny.html is a flaky failure
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com

The following layout test is flaky on macOS WK1

http/tests/security/XFrameOptions/x-frame-options-multiple-headers-sameorigin-deny.html

Probable cause:

Unknown.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Ftests%2Fsecurity%2FXFrameOptions%2Fx-frame-options-multiple-headers-sameorigin-deny.html

--- /Volumes/Data/slave/mojave-debug-tests-wk1/build/layout-test-results/http/tests/security/XFrameOptions/x-frame-options-multiple-headers-sameorigin-deny-expected.txt
+++ /Volumes/Data/slave/mojave-debug-tests-wk1/build/layout-test-results/http/tests/security/XFrameOptions/x-frame-options-multiple-headers-sameorigin-deny-actual.txt
@@ -1,5 +1,4 @@
 http://localhost:8000/security/XFrameOptions/resources/x-frame-options-multiple-headers-sameorigin.cgi - willSendRequest <NSURLRequest URL http://localhost:8000/security/XFrameOptions/resources/x-frame-options-multiple-headers-sameorigin.cgi, main document URL http://127.0.0.1:8000/security/XFrameOptions/x-frame-options-multiple-headers-sameorigin-deny.html, http method GET> redirectResponse (null)
-http://127.0.0.1:8000/security/XFrameOptions/x-frame-options-multiple-headers-sameorigin-deny.html - didFinishLoading
 CONSOLE MESSAGE: Refused to display 'http://localhost:8000/security/XFrameOptions/resources/x-frame-options-multiple-headers-sameorigin.cgi' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN, SAMEORIGIN'.
 CONSOLE MESSAGE: line 21: SecurityError: Sandbox access violation: Blocked a frame at "http://127.0.0.1:8000" from accessing a cross-origin frame.  The frame being accessed is sandboxed and lacks the "allow-same-origin" flag.
 CONSOLE MESSAGE: line 22: PASS: Could not read contentWindow.location.href

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