[Webkit-unassigned] [Bug 271210] New: REGRESSION(276137 at main): Flakey crashes from assertions

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https://bugs.webkit.org/show_bug.cgi?id=271210

            Bug ID: 271210
           Summary: REGRESSION(276137 at main): Flakey crashes from
                    assertions
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jbedard at apple.com

It looks like 276137 at main is causing sporadic assertion triggers on various debug queues. It's tough to pin down the exact regression point, but 276137 at main seems to fit all of the following tests impacted by these assertions:
    https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fstreams%2Ftransform-streams%2Freentrant-strategies.any.worker.html
    https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fstreams%2Ftransform-streams%2Fgeneral.any.serviceworker.html
    https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fstreams%2Ftransform-streams%2Freentrant-strategies.any.worker.html

It seems likely there are more. It's also possible I'm getting the regression point wrong, although 276137 at main is the most recent modification of Heap.cpp (which is where these assertions come from)

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