[Webkit-unassigned] [Bug 205286] New: REGRESSION: [ Mac wk2 ] imported/w3c/web-platform-tests/service-workers/service-worker/update-no-cache-request-headers.https.html is a flakey failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205286

            Bug ID: 205286
           Summary: REGRESSION: [ Mac wk2 ]
                    imported/w3c/web-platform-tests/service-workers/servic
                    e-worker/update-no-cache-request-headers.https.html is
                    a flakey failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com

imported/w3c/web-platform-tests/service-workers/service-worker/update-no-cache-request-headers.https.html

This test is a flakey failure on Mac WK2. It began failing around r253457

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fservice-workers%2Fservice-worker%2Fupdate-no-cache-request-headers.https.html

Diff:
--- /Volumes/Data/slave/highsierra-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/update-no-cache-request-headers.https-expected.txt
+++ /Volumes/Data/slave/highsierra-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/service-workers/service-worker/update-no-cache-request-headers.https-actual.txt
@@ -1,3 +1,3 @@

-PASS headers in no-cache mode 
+FAIL headers in no-cache mode promise_test: Unhandled rejection with value: object "TypeError: null is not an object (evaluating 'newWorker.postMessage')"


I am able to reproduced this failure by simply running the test, but I could not find a regression point due to the test continuing to fail locally on any revision.

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