[Webkit-unassigned] [Bug 187670] New: Layout Test media/media-source/media-source-remove.html is flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187670

            Bug ID: 187670
           Summary: Layout Test
                    media/media-source/media-source-remove.html is 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: tsavell at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Sierra and High Sierra Debug WK2

media/media-source/media-source-remove.html

Probable cause:

Looks like this test has been highly intermittent for a while. Only recorded crashes are on Debug WK2 platforms. looks like in several tests it records media/media-source/media-source-remove-unload-crash.html as the crashing test. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=media%2Fmedia-source%2Fmedia-source-remove.html

Crash Log:
https://build.webkit.org/results/Apple%20High%20Sierra%20Debug%20WK2%20(Tests)/r233813%20(4101)/media/media-source/media-source-remove-crash-log.txt

Crash Excerpt:
VM Regions Near 0xbbadbeef:
--> 
    __TEXT                 0000000108580000-0000000108582000 [    8K] r-x/rwx SM=COW  /Volumes/VOLUME/*/WebKit.framework/Versions/A/XPCServices/com.apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent.Development

Application Specific Information:
CRASHING TEST: media/media-source/media-source-remove-unload-crash.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore            0x000000037ced72f0 WTFCrash + 16 (Assertions.cpp:267)
1   com.apple.WebCore                   0x000000036fead27c WebCore::FrameView::didDestroyRenderTree() + 876 (FrameView.cpp:600)
2   com.apple.WebCore                   0x000000036f4ec45e WebCore::Document::destroyRenderTree() + 1214
3   com.apple.WebCore                   0x000000036f4ec730 WebCore::Document::prepareForDestruction() + 624 (Document.cpp:2391)
4   com.apple.WebCore                   0x000000036fea0fd0 WebCore::Frame::setView(WTF::RefPtr<WebCore::FrameView, WTF::DumbPtrTraits<WebCore::FrameView> >&&) + 192 (Frame.cpp:257)
5   com.apple.WebCore                   0x000000036fea50a9 WebCore::Frame::createView(WebCore::IntSize const&, WebCore::Color const&, bool, WebCore::IntSize const&,

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