[Webkit-unassigned] [Bug 196274] New: [ Mojave WK1 iOS Sim WK2] Layout Test imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196274

            Bug ID: 196274
           Summary: [ Mojave WK1 iOS Sim WK2] Layout Test
                    imported/w3c/web-platform-tests/xhr/send-redirect-post
                    -upload.htm is a flaky crash
           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
                CC: lforschler at apple.com

Created attachment 366005

  --> https://bugs.webkit.org/attachment.cgi?id=366005&action=review

Mojave WK1 Crash

The following layout test is flaky on Mojave WK1 and iOS Simulator Release WK2

imported/w3c/web-platform-tests/xhr/send-redirect-post-upload.htm

Probable cause:

Test has been crashing for some time, most recent fix was https://trac.webkit.org/changeset/242723/webkit 

I can reproduce locally on Mojave WK1 with 5000 iterations I got it to crash once. (will attach crash logs).
I can reproduce the iOS Sim much easier, it crashed 9 times in 18 iterations before I stopped it (will attach crash logs).

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fxhr%2Fsend-redirect-post-upload.htm

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