[Webkit-unassigned] [Bug 198379] New: REGRESSION (r245873) [Mac WK2] Layout Test http/wpt/service-workers/update-service-worker.https.html is a flaky crash after running new test

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198379

            Bug ID: 198379
           Summary: REGRESSION (r245873) [Mac WK2] Layout Test
                    http/wpt/service-workers/update-service-worker.https.h
                    tml is a flaky crash after running new test
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com

The following layout test is failing on Mac WK2

http/wpt/service-workers/update-service-worker.https.html

Probable cause:

Due to an unrelated issue we do not have results on the dashboard yet, but I was able to verify locally this crash happens after r245873 . 

New test added http/wpt/service-workers/service-worker-networkprocess-crash.html when run before http/wpt/service-workers/update-service-worker.https.html will flakily cause a crash on Mac WK2

reproduces like this:

run-webkit-tests http/wpt/service-workers/service-worker-networkprocess-crash.html http/wpt/service-workers/update-service-worker.https.html --child-process 1 --iter 10 --exit-after-n-crashes=1

Usually crashes in 3 runs.

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=http%2Fwpt%2Fservice-workers%2Fupdate-service-worker.https.html

Will post full crash log in radar:

0   com.apple.WebKit                    0x000000010976889d WebKit::SharedStringHashTableReadOnly::setSharedMemory(WTF::RefPtr<WebKit::SharedMemory, WTF::DumbPtrTraits<WebKit::SharedMemory> >&&) + 19
1   com.apple.WebKit                    0x00000001099ccc59 WebKit::WebSWOriginTable::setSharedMemory(WebKit::SharedMemory::Handle const&) + 63
2   com.apple.WebKit                    0x0000000109ad7208 WebKit::WebSWClientConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 6580
3   com.apple.WebKit                    0x00000001095fdd67 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) + 165
4   com.apple.WebKit                    0x000000010960476e WTF::Detail::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14, void>::call() + 202

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