234496 2021-12-19 18:38:32 -0800 Assertion when reloading webm video: ASSERT(!m_parseTracksStatus); 2021-12-19 19:14:32 -0800 1 1 1 Unclassified WebKit Media Other Unspecified Unspecified NEW InRadar P2 Normal --- 232740 1 jean-yves.avenard webkit-unassigned aestes webkit-bug-importer oldest_to_newest 1825511 0 jean-yves.avenard 2021-12-19 18:38:32 -0800 STR: In a debug build: - Load http://cali.apple.com/qadrift/_media/_streams/webM/source_files/vp8/Big_Buck_Bunny_4K.webm.480p.webm - Refresh the page Assertion ASSERT(!m_parseTracksStatus); in MediaFormatReader::didParseTracks ``` lldb) bt * thread #28, queue = 'WebKit::MediaFormatReader Queue', stop reason = EXC_BAD_ACCESS (code=1, address=0xbbadbeef) frame #0: 0x000000013322cafc JavaScriptCore`::WTFCrash() at Assertions.cpp:322:35 frame #1: 0x000000011857bda4 WebKit`WTFCrashWithInfo((null)=188, (null)="/Users/jyavenard/Work/webkit/OpenSource/Source/WebKit/Shared/mac/MediaFormatReader/MediaFormatReader.cpp", (null)="void WebKit::MediaFormatReader::didParseTracks(SourceBufferPrivateClient::InitializationSegment &&, uint64_t)", (null)=2723) at Assertions.h:732:5 * frame #2: 0x000000011898f258 WebKit`WebKit::MediaFormatReader::didParseTracks(this=0x0000600000cc9220, segment=0x000000016d072700, errorCode=2008) at MediaFormatReader.cpp:188:5 frame #3: 0x000000011899d2e0 WebKit`WebKit::MediaFormatReader::parseByteSource(this=0x0000000106004108, errorCode=2008)::$_4::operator()(unsigned long long) const at MediaFormatReader.cpp:162:9 frame #4: 0x000000011899d1a0 WebKit`WTF::Detail::CallableWrapper<WebKit::MediaFormatReader::parseByteSource(WTF::RetainPtr<OpaqueMTPluginByteSource*>&&)::$_4, void, unsigned long long>::call(this=0x0000000106004100, in=2008) at Function.h:53:39 frame #5: 0x00000001482d1568 WebCore`WTF::Function<void (unsigned long long)>::operator(this=0x0000000106078220, in=2008)(unsigned long long) const at Function.h:82:35 frame #6: 0x000000014aa040fc WebCore`WebCore::SourceBufferParserWebM::appendData(this=0x000000010613c0c8)>&&, WebCore::SourceBufferParser::AppendFlags)::$_11::operator()() const at SourceBufferParserWebM.cpp:749:13 frame #7: 0x000000014aa03e50 WebCore`WTF::Detail::CallableWrapper<WebCore::SourceBufferParserWebM::appendData(WebCore::SourceBufferParser::Segment&&, WTF::CompletionHandler<void ()>&&, WebCore::SourceBufferParser::AppendFlags)::$_11, void>::call(this=0x000000010613c0c0) at Function.h:53:39 frame #8: 0x00000001332542b0 JavaScriptCore`WTF::Function<void ()>::operator(this=0x0000000106008228)() const at Function.h:82:35 frame #9: 0x00000001333794b8 JavaScriptCore`WTF::(anonymous namespace)::DispatchWorkItem::operator(this=0x0000000106008220)() at WorkQueueCocoa.cpp:40:25 frame #10: 0x0000000133377d54 JavaScriptCore`void WTF::dispatchWorkItem<WTF::(anonymous namespace)::DispatchWorkItem>(dispatchContext=0x0000000106008220) at WorkQueueCocoa.cpp:48:5 frame #11: 0x000000010347e480 libdispatch.dylib`_dispatch_client_callout + 20 frame #12: 0x0000000103487834 libdispatch.dylib`_dispatch_lane_serial_drain + 980 frame #13: 0x000000010348889c libdispatch.dylib`_dispatch_lane_invoke + 440 frame #14: 0x0000000103498184 libdispatch.dylib`_dispatch_workloop_worker_thread + 1232 frame #15: 0x000000010307fef4 libsystem_pthread.dylib`_pthread_wqthread + 288 (lldb) ``` 1825512 1 jean-yves.avenard 2021-12-19 19:14:07 -0800 This started with bug 232740 as now an error can be returned while reading, which causes an error to be emitted and the error handler will call didParseTracks() again 1825513 2 webkit-bug-importer 2021-12-19 19:14:32 -0800 <rdar://problem/86706195>