212650 2020-06-02 12:30:47 -0700 ASSERTION FAILED: isCell() under WebCore::JSDOMConstructor seen with webaudio/the-audio-api/the-audiocontext-interface/audiocontextoptions.html 2020-06-03 08:19:31 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ryanhaddad ysuzuki cdumez mark.lam rniwa webkit-bot-watchers-bugzilla webkit-bug-importer youennf ysuzuki oldest_to_newest 1658414 0 ryanhaddad 2020-06-02 12:30:47 -0700 imported/w3c/web-platform-tests/webaudio/the-audio-api/the-audiocontext-interface/audiocontextoptions.html, imported with https://trac.webkit.org/changeset/262405/webkit, is consistently crashing on debug bots with the following: ASSERTION FAILED: isCell() /Volumes/Data/slave/catalina-debug/build/WebKitBuild/Debug/JavaScriptCore.framework/PrivateHeaders/JSCJSValueInlines.h(557) : JSC::JSCell *JSC::JSValue::asCell() const 1 0x3e5a304d9 WTFCrash 2 0x3c800296b WTFCrashWithInfo(int, char const*, char const*, int) 3 0x3c80eda7b JSC::JSValue::asCell() const 4 0x3c831dd65 JSC::asObject(JSC::JSValue) 5 0x3c861e52b WebCore::JSDOMConstructor<WebCore::JSAudioContext>::construct(JSC::JSGlobalObject*, JSC::CallFrame*) 6 0x3e6e99c45 JSC::NativeFunction::operator()(JSC::JSGlobalObject*, JSC::CallFrame*) 7 0x3e6e99b22 JSC::TaggedNativeFunction::operator()(JSC::JSGlobalObject*, JSC::CallFrame*) 8 0x3e6f10c43 JSC::LLInt::handleHostCall(JSC::CallFrame*, JSC::JSValue, JSC::CodeSpecializationKind) 9 0x3e6f0fdd1 JSC::LLInt::setUpCall(JSC::CallFrame*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) 10 0x3e6f01763 JSC::SlowPathReturnType JSC::LLInt::genericCall<JSC::OpConstruct>(JSC::CodeBlock*, JSC::CallFrame*, JSC::OpConstruct&&, JSC::CodeSpecializationKind, unsigned int) 11 0x3e6f015ff llint_slow_path_construct 12 0x3e5fb69cc llint_entry 13 0x3e5fb5b32 llint_entry 14 0x3e5fb5b32 llint_entry 15 0x3e5fb5b32 llint_entry 16 0x3e5fb5b32 llint_entry 17 0x3e5fb693b llint_entry 18 0x3e5fb6e4b llint_entry 19 0x3e5fb5a8f llint_entry 20 0x3e5fb5b32 llint_entry 21 0x3e5fb693b llint_entry 22 0x3e5fb5b32 llint_entry 23 0x3e5f95d33 vmEntryToJavaScript 24 0x3e6dc9d8b JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) 25 0x3e6dca54f JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 26 0x3e7146a7d JSC::call(JSC::JSGlobalObject*, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 27 0x3e7146d53 JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) 28 0x3e7323482 JSC::JSMicrotask::run(JSC::JSGlobalObject*) 29 0x3ca5140ce WebCore::JSExecState::runTask(JSC::JSGlobalObject*, JSC::Microtask&) 30 0x3ca51b27b WebCore::JSMicrotaskCallback::call() 31 0x3ca51b0fd WebCore::JSDOMWindowBase::queueMicrotaskToEventLoop(JSC::JSGlobalObject&, WTF::Ref<JSC::Microtask, WTF::DumbPtrTraits<JSC::Microtask> >&&)::$_35::operator()() LEAK: 1 WebPageProxy https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fwebaudio%2Fthe-audio-api%2Fthe-audiocontext-interface%2Faudiocontextoptions.html 1658415 1 ryanhaddad 2020-06-02 12:30:59 -0700 <rdar://63886202> 1658416 2 webkit-bug-importer 2020-06-02 12:31:23 -0700 <rdar://problem/63887102> 1658521 3 ryanhaddad 2020-06-02 17:47:26 -0700 Skipped the test for macOS/iOS debug in r262464 and r262465. 1658618 4 400895 ysuzuki 2020-06-02 22:10:28 -0700 Created attachment 400895 Patch 1658619 5 400896 ysuzuki 2020-06-02 22:11:33 -0700 Created attachment 400896 Patch 1658621 6 ysuzuki 2020-06-02 22:16:33 -0700 I'll update binding tests results. 1658622 7 400896 mark.lam 2020-06-02 22:17:49 -0700 Comment on attachment 400896 Patch r=me. Please rebase the bindings test results. 1658636 8 ysuzuki 2020-06-02 23:49:56 -0700 imported/w3c/web-platform-tests/service-workers/service-worker/fetch-request-no-freshness-headers.https.html is failing on iOS without this. https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fservice-workers%2Fservice-worker%2Ffetch-request-no-freshness-headers.https.html 1658637 9 ysuzuki 2020-06-02 23:53:23 -0700 Committed r262479: <https://trac.webkit.org/changeset/262479> 1658696 10 400896 cdumez 2020-06-03 08:19:31 -0700 Comment on attachment 400896 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=400896&action=review > Source/WebCore/ChangeLog:8 > + Some DOM constructor can return jsNull. For example, AudioContext constructor can return jsNull when it exceeds # of hardware audio contexts. This looks like a bug in the AudioContext implementation. This is not the specified behavior: https://www.w3.org/TR/webaudio/#AudioContext-constructors "If the AudioContext is not allowed to start, abort these steps." So we're supposed to construct an AudioContext but it is not supposed to start playing. I can understand if you don't want to fix the WebAudio implementation. But then why not simply add a new WebIDL attribute like [ConstructorMayReturnNull], and then the bindings generator would use toJS() instead of toJSNewlyCreated() in this case? > Source/WebCore/ChangeLog:9 > + However CodeGeneratorJS assumes that DOM constructor always returns an object, or throws an exception. Yes, this was the whole idea behind toJSNewlyCreated() vs toJS(). This was an optimization to avoid the null check when the object was just constructed. It seems like this change is reverting the optimization. 400895 2020-06-02 22:10:28 -0700 2020-06-02 22:11:32 -0700 Patch bug-212650-20200602221027.patch text/plain 5351 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjYyNDY5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZmJkNjUwZjNhOThjZWUy ZDEyOTcyZTkzMjU5YWY0ZThhM2MwMjllZC4uZDg0ZDRiMjk4OGYxNWEyZTIxNmY5OWM0N2FmODYx Y2I0NmE2YmIzOSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE3IEBACisyMDIwLTA2LTAyICBZdXN1 a2UgU3V6dWtpICA8eXN1enVraUBhcHBsZS5jb20+CisKKyAgICAgICAgQVNTRVJUSU9OIEZBSUxF RDogaXNDZWxsKCkgdW5kZXIgV2ViQ29yZTo6SlNET01Db25zdHJ1Y3RvciBzZWVuIHdpdGggd2Vi YXVkaW8vdGhlLWF1ZGlvLWFwaS90aGUtYXVkaW9jb250ZXh0LWludGVyZmFjZS9hdWRpb2NvbnRl eHRvcHRpb25zLmh0bWwKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcu Y2dpP2lkPTIxMjY1MAorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisg 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