[Webkit-unassigned] [Bug 201429] New: REGRESSION (r249338?): Layout Test imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201429

            Bug ID: 201429
           Summary: REGRESSION (r249338?): Layout Test
                    imported/w3c/web-platform-tests/service-workers/servic
                    e-worker/postmessage-to-client-message-queue.https.htm
                    l is a flaky failure
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com
                CC: webkit-bot-watchers-bugzilla at group.apple.com

The following layout test is failing on [insert platform]

imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https.html

Probable cause:

This appears to have started with:
"Add support for postMessage buffering between the service worker and window"
https://trac.webkit.org/changeset/249338/webkit 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fservice-workers%2Fservice-worker%2Fpostmessage-to-client-message-queue.https.html


--- /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https-expected.txt
+++ /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/postmessage-to-client-message-queue.https-actual.txt
@@ -2,6 +2,6 @@
 PASS Messages from ServiceWorker to Client only received after DOMContentLoaded event. 
 PASS Messages from ServiceWorker to Client only received after calling startMessages(). 
 PASS Messages from ServiceWorker to Client only received after setting onmessage. 
-PASS Microtasks run before dispatching messages after calling startMessages(). 
-PASS Microtasks run before dispatching messages after setting onmessage. 
+FAIL Microtasks run before dispatching messages after calling startMessages(). promise_test: Unhandled rejection with value: object "Error: wait_for_state must be passed a ServiceWorker"
+FAIL Microtasks run before dispatching messages after setting onmessage. promise_test: Unhandled rejection with value: object "Error: wait_for_state must be passed a ServiceWorker"

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