[Webkit-unassigned] [Bug 217525] New: ASSERTION FAILURE: REGRESSION(r268052?): WTF::CompletionHandler<void ()>::~CompletionHandler(): Completion handler should always be called !m_function

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217525

            Bug ID: 217525
           Summary: ASSERTION FAILURE: REGRESSION(r268052?):
                    WTF::CompletionHandler<void ()>::~CompletionHandler():
                    Completion handler should always be called !m_function
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hector_i_lopez at apple.com

Created attachment 410959

  --> https://bugs.webkit.org/attachment.cgi?id=410959&action=review

Crash log fo imported/w3c/web-platform-tests/mediacapture-record/MediaRecorder-stop.html

imported/w3c/web-platform-tests/mediacapture-record/MediaRecorder-stop.html

Test is a flaky failure according to history on macOS Catalina wk2 Debug. First occurrence of failure is at r268054 but I believe this crash might be associated with change at r268052. 

History:

https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmediacapture-record%2FMediaRecorder-stop.html&platform=mac&version_name=Catalina&style=debug&flavor=wk2

Crash log as seen on stderr:

ASSERTION FAILED: Completion handler should always be called
!m_function
/Volumes/Data/slave/catalina-debug/build/WebKitBuild/Debug/usr/local/include/wtf/CompletionHandler.h(53) : WTF::CompletionHandler<void ()>::~CompletionHandler()
1   0x68e144699 WTFCrash
2   0x66df885f7 WTF::CompletionHandler<void ()>::~CompletionHandler()
3   0x66df88595 WTF::CompletionHandler<void ()>::~CompletionHandler()
4   0x66ffa5b76 WebCore::MediaRecorderPrivateWriter::flushCompressedSampleBuffers(WTF::CompletionHandler<void ()>&&)::$_4::~$_4()
5   0x66ff9f3d5 WebCore::MediaRecorderPrivateWriter::flushCompressedSampleBuffers(WTF::CompletionHandler<void ()>&&)::$_4::~$_4()
6   0x66ffa5262 WTF::BlockPtr<void ()> WTF::BlockPtr<void ()>::fromCallable<WebCore::MediaRecorderPrivateWriter::flushCompressedSampleBuffers(WTF::CompletionHandler<void ()>&&)::$_4>(WebCore::MediaRecorderPrivateWriter::flushCompressedSampleBuffers(WTF::CompletionHandler<void ()>&&)::$_4)::'lambda'(void const*)::operator()(void const*) const
7   0x66ffa5205 WTF::BlockPtr<void ()> WTF::BlockPtr<void ()>::fromCallable<WebCore::MediaRecorderPrivateWriter::flushCompressedSampleBuffers(WTF::CompletionHandler<void ()>&&)::$_4>(WebCore::MediaRecorderPrivateWriter::flushCompressedSampleBuffers(WTF::CompletionHandler<void ()>&&)::$_4)::'lambda'(void const*)::__invoke(void const*)
8   0x7fff692b5bd5 _Block_release
9   0x7fff2aad3ebd -[AVAssetWriterInputMediaDataRequester dealloc]
10  0x7fff2aacc81e -[AVAssetWriterInputWritingHelper dealloc]
11  0x7fff318c0f12 NSKVODeallocate
12  0x7fff2aac8f2a -[AVAssetWriterInput dealloc]
13  0x7fff318c0f12 NSKVODeallocate
14  0x66ffaca59 WTF::RetainPtr<AVAssetWriterInput>::~RetainPtr()
15  0x66ff9ce05 WTF::RetainPtr<AVAssetWriterInput>::~RetainPtr()
16  0x66ff9cf4f WebCore::MediaRecorderPrivateWriter::~MediaRecorderPrivateWriter()
17  0x66ff9d235 WebCore::MediaRecorderPrivateWriter::~MediaRecorderPrivateWriter()
18  0x66ffaa99a WTF::ThreadSafeRefCounted<WebCore::MediaRecorderPrivateWriter, (WTF::DestructionThread)1>::deref() const::'lambda'()::operator()() const
19  0x66ffaa8f7 WTF::ThreadSafeRefCounted<WebCore::MediaRecorderPrivateWriter, (WTF::DestructionThread)1>::deref() const
20  0x66ffaa82f WTF::Ref<WebCore::MediaRecorderPrivateWriter, WTF::DumbPtrTraits<WebCore::MediaRecorderPrivateWriter> >::~Ref()
21  0x66ff9c705 WTF::Ref<WebCore::MediaRecorderPrivateWriter, WTF::DumbPtrTraits<WebCore::MediaRecorderPrivateWriter> >::~Ref()
22  0x6722a6e5b WebCore::MediaRecorderPrivateAVFImpl::~MediaRecorderPrivateAVFImpl()
23  0x6722a6ea5 WebCore::MediaRecorderPrivateAVFImpl::~MediaRecorderPrivateAVFImpl()
24  0x6722a6eec WebCore::MediaRecorderPrivateAVFImpl::~MediaRecorderPrivateAVFImpl()
25  0x66fff2a4f std::__1::default_delete<WebCore::MediaRecorderPrivate>::operator()(WebCore::MediaRecorderPrivate*) const
26  0x66fff29cf std::__1::unique_ptr<WebCore::MediaRecorderPrivate, std::__1::default_delete<WebCore::MediaRecorderPrivate> >::reset(WebCore::MediaRecorderPrivate*)
27  0x66fff2969 std::__1::unique_ptr<WebCore::MediaRecorderPrivate, std::__1::default_delete<WebCore::MediaRecorderPrivate> >::~unique_ptr()
28  0x66ffe0bd5 std::__1::unique_ptr<WebCore::MediaRecorderPrivate, std::__1::default_delete<WebCore::MediaRecorderPrivate> >::~unique_ptr()
29  0x66ffe10a1 WebCore::MediaRecorder::~MediaRecorder()
30  0x66ffe1245 WebCore::MediaRecorder::~MediaRecorder()
31  0x66ffe12cc WebCore::MediaRecorder::~MediaRecorder()
LEAK: 1 WebPageProxy

See attachment for full crash log

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