[Webkit-unassigned] [Bug 193724] New: Flaky AVEncoderBitRateKey symbol not found crash on imported/w3c/web-platform-tests/mediacapture-record/MediaRecorder-constructor.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193724

            Bug ID: 193724
           Summary: Flaky AVEncoderBitRateKey symbol not found crash on
                    imported/w3c/web-platform-tests/mediacapture-record/Me
                    diaRecorder-constructor.html
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: ddkilzer at webkit.org, eric.carlson at apple.com,
                    jer.noble at apple.com, jlewis3 at apple.com,
                    ryanhaddad at apple.com, tsavell at apple.com,
                    webkit-bug-importer at group.apple.com

Not sure how this kind of an issue can be flaky, but it is. Happens on both High Sierra and Mojave, debug and release.

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported/w3c/web-platform-tests/mediacapture-record/MediaRecorder-constructor.html

Happens as long as records go, since mid-December at least.

ASSERTION FAILED: dlsym(0x7fce1ed713b0, AVEncoderBitRateKey): symbol not found
constant
./platform/mediarecorder/cocoa/MediaRecorderPrivateWriterCocoa.mm(55) : NSString *initAVEncoderBitRateKey()
1   0x21fa0eb89 WTFCrash
2   0x20e91aea0 initAVEncoderBitRateKey()
3   0x20e90f0f7 WebCore::MediaRecorderPrivateWriter::setAudioInput()
4   0x20e90eca4 WebCore::MediaRecorderPrivateWriter::create(WebCore::MediaStreamTrackPrivate const*, WebCore::MediaStreamTrackPrivate const*)
5   0x2110a479a WebCore::MediaRecorderPrivateAVFImpl::create(WebCore::MediaStreamPrivate const&)
6   0x20f73f026 WebCore::MediaRecorder::getPrivateImpl(WebCore::MediaStreamPrivate const&)
7   0x20f73ed87 WebCore::MediaRecorder::create(WebCore::Document&, WTF::Ref<WebCore::MediaStream, WTF::DumbPtrTraits<WebCore::MediaStream> >&&, WebCore::MediaRecorder::Options&&)

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