[Webkit-unassigned] [Bug 217669] New: REGRESSION (iOS 14): [ iOS wk2 ] service-workers-spinning tests are flaky failures

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217669

            Bug ID: 217669
           Summary: REGRESSION (iOS 14): [ iOS wk2 ]
                    service-workers-spinning tests are flaky failures
           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: rackler at apple.com

Description:
http/wpt/service-workers/service-worker-spinning-activate.https.html
http/wpt/service-workers/service-worker-spinning-fetch.https.html
http/wpt/service-workers/service-worker-spinning-install.https.html
http/wpt/service-workers/service-worker-spinning-message.https.html

The first failure that I see this on the dashboard was 09/29/20 at r267741, but I was not able to find a commit that seemed relevant that would have caused this.  
All of the failures test times are approximately 27-29 seconds.  The tests also alternate between flaky failing and time out.  The test behavior has been like this since the tests began running on iOS 14.

I have attempted to reproduce the behavior, but so far have been unsuccessful.

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&suite=layout-tests&test=http%2Fwpt%2Fservice-workers%2Fservice-worker-spinning-activate.https.html&test=http%2Fwpt%2Fservice-workers%2Fservice-worker-spinning-fetch.https.html&test=http%2Fwpt%2Fservice-workers%2Fservice-worker-spinning-install.https.html&test=http%2Fwpt%2Fservice-workers%2Fservice-worker-spinning-message.https.html&platform=ios&limit=50000

Diff Log:
http/wpt/service-workers/service-worker-spinning-activate.https.html

--- /Volumes/Data/slave/ios-simulator-14-release-tests-wk2/build/layout-test-results/http/wpt/service-workers/service-worker-spinning-activate.https-expected.txt
+++ /Volumes/Data/slave/ios-simulator-14-release-tests-wk2/build/layout-test-results/http/wpt/service-workers/service-worker-spinning-activate.https-actual.txt
@@ -1,5 +1,7 @@


-PASS Spin in activate
-PASS Spin after activate
+Harness Error (TIMEOUT), message = null

+TIMEOUT Spin in activate Test timed out
+NOTRUN Spin after activate
+

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