[Webkit-unassigned] [Bug 230644] New: ASSERTION FAILED: Unsafe to ref/deref from different threads m_isOwnedByMainThread == isMainThread() /Volumes/Data/worker/bigsur-debug/build/WebKitBuild/Debug/usr/local/include/wtf/RefCounted.h(114) : void WTF::RefCountedBase::applyRefDerefThreadingCheck(

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230644

            Bug ID: 230644
           Summary: ASSERTION FAILED: Unsafe to ref/deref from different
                    threads m_isOwnedByMainThread == isMainThread()
                    /Volumes/Data/worker/bigsur-debug/build/WebKitBuild/De
                    bug/usr/local/include/wtf/RefCounted.h(114) : void
                    WTF::RefCountedBase::applyRefDerefThreadingCheck(
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Mac (Intel)
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ayumi_kojima at apple.com

imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-negative.html

Is a flaky crash on macOS wk1 Debug.

History: https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmedia-source%2Fmediasource-changetype-play-negative.html

Stderr:

2021-09-22 12:21:01.415 DumpRenderTree[58389:29549883] *** WARNING: Method convertPointToBase: in class NSView is deprecated on 10.7 and later. It should not be used in new applications. 
ASSERTION FAILED: Unsafe to ref/deref from different threads
m_isOwnedByMainThread == isMainThread()
/Volumes/Data/worker/bigsur-debug/build/WebKitBuild/Debug/usr/local/include/wtf/RefCounted.h(114) : void WTF::RefCountedBase::applyRefDerefThreadingCheck() const
1   0x107107539 WTFCrash
2   0x12849df91 WTF::RefCountedBase::applyRefDerefThreadingCheck() const
3   0x12849dd6c WTF::RefCountedBase::derefBase() const
4   0x12850920f WTF::RefCounted<WebCore::SharedBuffer, std::__1::default_delete<WebCore::SharedBuffer> >::deref() const
5   0x1285091dc WTF::Ref<WebCore::SharedBuffer, WTF::RawPtrTraits<WebCore::SharedBuffer> >::~Ref()
6   0x1284fe755 WTF::Ref<WebCore::SharedBuffer, WTF::RawPtrTraits<WebCore::SharedBuffer> >::~Ref()
7   0x1289ba0ea WebCore::SourceBufferParserAVFObjC::appendData(WebCore::SourceBufferParser::Segment&&, WTF::CompletionHandler<void ()>&&, WebCore::SourceBufferParser::AppendFlags)
8   0x1289cbf7c WebCore::SourceBufferPrivateAVFObjC::append(WTF::Ref<WebCore::SharedBuffer, WTF::RawPtrTraits<WebCore::SharedBuffer> >&&)::$_13::operator()()
9   0x1289cbeac invocation function for block in WebCore::SourceBufferPrivateAVFObjC::append(WTF::Ref<WebCore::SharedBuffer, WTF::RawPtrTraits<WebCore::SharedBuffer> >&&)
10  0x7fff2020d623 _dispatch_call_block_and_release
11  0x7fff2020e806 _dispatch_client_callout
12  0x7fff202111b0 _dispatch_continuation_pop
13  0x7fff20210887 _dispatch_async_redirect_invoke
14  0x7fff2021d818 _dispatch_root_queue_drain
15  0x7fff2021df70 _dispatch_worker_thread2
16  0x7fff203b5417 _pthread_wqthread
17  0x7fff203b442f start_wqthread

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