[Webkit-unassigned] [Bug 228640] New: [Mac Debug] imported/w3c/web-platform-tests/html/cross-origin-embedder-policy/credentialless/dedicated-worker.tentative.https.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228640

            Bug ID: 228640
           Summary: [Mac Debug]
                    imported/w3c/web-platform-tests/html/cross-origin-embe
                    dder-policy/credentialless/dedicated-worker.tentative.
                    https.html is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ehutchison at apple.com

imported/w3c/web-platform-tests/html/cross-origin-embedder-policy/credentialless/dedicated-worker.tentative.https.html

is a flaky failure on Mac Debug.

History: https://results.webkit.org/?platform=mac&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fcross-origin-embedder-policy%2Fcredentialless%2Fdedicated-worker.tentative.https.html

Results: https://build.webkit.org/results/Apple-BigSur-Debug-AppleSilicon-WK2-Tests/r280349%20(2284)/results.html

Diff: 
--- /Volumes/Data/worker/bigsur-debug-applesilicon-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/html/cross-origin-embedder-policy/credentialless/dedicated-worker.tentative.https-expected.txt
+++ /Volumes/Data/worker/bigsur-debug-applesilicon-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/html/cross-origin-embedder-policy/credentialless/dedicated-worker.tentative.https-actual.txt
@@ -3,9 +3,11 @@
 CONSOLE MESSAGE: Unhandled Promise Rejection: ReferenceError: Can't find variable: worker
 CONSOLE MESSAGE: Unhandled Promise Rejection: ReferenceError: Can't find variable: worker

+Harness Error (TIMEOUT), message = null
+
 PASS dedicated-worker
 PASS fetch same-origin + credentialless worker
 FAIL fetch same-origin assert_equals: coep:credentialless =>  expected "Worker blocked" but got "same_origin"
 FAIL fetch cross-origin assert_equals: coep:credentialless =>  expected "Worker blocked" but got "cross_origin"
-FAIL fetch cross-origin + credentialless worker assert_equals: coep:none =>  expected (undefined) undefined but got (string) "cross_origin"
+TIMEOUT fetch cross-origin + credentialless worker Test timed out

Reproduced error with run-webkit-tests --debug -f --iterations 500 --exit-after-n-failures 1 imported/w3c/web-platform-tests/html/cross-origin-embedder-policy/credentialless/dedicated-worker.tentative.https.html

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