[Webkit-unassigned] [Bug 191707] New: [ iOS WK2 ] Layout Test imported/w3c/web-platform-tests/webrtc/simplecall.https.html is flaky crashing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191707

            Bug ID: 191707
           Summary: [ iOS WK2 ] Layout Test
                    imported/w3c/web-platform-tests/webrtc/simplecall.http
                    s.html is flaky crashing
           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 iOS WK2

imported/w3c/web-platform-tests/webrtc/simplecall.https.html

Probable cause:

This test has started crashing recently. We need to find the regression point. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2Fwebrtc%2Fsimplecall.https.html

Log:
https://build.webkit.org/results/Apple%20iOS%2012%20Simulator%20Release%20WK2%20(Tests)/r238223%20(976)/imported/w3c/web-platform-tests/webrtc/simplecall.https-crash-log.txt

Excerpt:
Application Specific Information:
CRASHING TEST: imported/mozilla/svg/smil/style/anim-css-fontsize-1-from-to-px-px-expected.svg
CoreSimulator 572.2 - Device: Managed 3 - Runtime: iOS 12.0 (16A366) - DeviceType: iPhone SE

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.CoreFoundation            0x000000010373b140 CFBasicHashRemoveValue + 800
1   com.apple.CoreFoundation            0x00000001036044f8 CFDictionaryRemoveValue + 152
2   com.apple.VideoToolbox              0x00000001104b9fe7 VTPixelTransferSessionTransferImage + 5581
3   com.apple.VideoToolbox              0x0000000110522814 VTPixelBufferConformerCopyConformedPixelBuffer + 2068
4   com.apple.WebCore                   0x000000010bf5b46f WebCore::PixelBufferConformerCV::convert(__CVBuffer*) + 111 (PixelBufferConformerCV.cpp:152)
5   com.apple.WebCore                   0x000000010acfcd09 WebCore::RealtimeOutgoingVideoSourceCocoa::convertToYUV(__CVBuffer*) + 233 (RealtimeOutgoingVideoSourceCocoa.mm:49)
6   com.apple.WebCore                   0x000000010bfc5d10 WebCore::RealtimeOutgoingVideoSourceCocoa::sampleBufferUpdated(WebCore::MediaStreamTrackPrivate&, WebCore::MediaSample&) + 368 (RetainPtr.h:248)
7   com.apple.WebCore                   0x000000010bfa4dc7 WebCore::MediaStreamTrackPrivate::forEachObserver(WTF::Function<void

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