Bug 188724 – accessibility/notification-listeners.html abandons a document

• Status: RESOLVED
• Resolution: FIXED
• Component: Accessibility

[Simon Fraser (smfr)]

accessibility/notification-listeners.html abandons a document (see bug 186214).

The unmatched refs come from:

Document 0x6d3d02400 reference stacks:
Backtrace for token 179
1   0x6b830a08c WebCore::adopted(WebCore::Node*)
2   0x6b9a8639b WTF::Ref<WebCore::HTMLDocument, WTF::DumbPtrTraits<WebCore::HTMLDocument> > WTF::adoptRef<WebCore::HTMLDocument, WTF::DumbPtrTraits<WebCore::HTMLDocument> >(WebCore::HTMLDocument&)
3   0x6b9a85daf WTF::Ref<WebCore::HTMLDocument, WTF::DumbPtrTraits<WebCore::HTMLDocument> > WTF::static_reference_cast<WebCore::HTMLDocument, WTF::DumbPtrTraits<WebCore::HTMLDocument>, WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >(WTF::Ref<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >&&)
4   0x6b9a85ae0 std::__1::enable_if<!(std::is_same<WebCore::HTMLDocument, WebCore::Document>::value), WebCore::JSDOMWrapperConverterTraits<WebCore::HTMLDocument>::WrapperClass*>::type WebCore::createWrapper<WebCore::HTMLDocument, WebCore::Document>(WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >&&)
5   0x6b9a82c07 WebCore::createNewDocumentWrapper(JSC::ExecState&, WebCore::JSDOMGlobalObject&, WTF::Ref<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >&&)
6   0x6b9a82ba0 WebCore::toJSNewlyCreated(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >&&)
7   0x6b9a82d1a WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Document&)
8   0x6b9a99358 WebCore::createWrapperInline(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Node, WTF::DumbPtrTraits<WebCore::Node> >&&)
9   0x6b9a99080 WebCore::createWrapper(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Node, WTF::DumbPtrTraits<WebCore::Node> >&&)
10  0x6b83223be WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Node&)
11  0x6b837bb90 WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Node*)
12  0x6b9a70fb3 WebCore::JSDOMWindowBase::updateDocument()
13  0x6b9ac2d63 WebCore::ScriptController::updateDocument()
14  0x6b9f6b86b WebCore::Document::didBecomeCurrentDocumentInFrame()
15  0x6ba99580b WebCore::Frame::setDocument(WTF::RefPtr<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >&&)
16  0x6ba7b11ad WebCore::DocumentWriter::begin(WebCore::URL const&, bool, WebCore::Document*)
17  0x6ba770f7e WebCore::DocumentLoader::commitData(char const*, unsigned long)
18  0x109b50b92 WebKit::WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int)
19  0x6ba776add WebCore::DocumentLoader::commitLoad(char const*, int)
20  0x6ba7769fb WebCore::DocumentLoader::dataReceived(char const*, int)
21  0x6ba777278 WebCore::DocumentLoader::dataReceived(WebCore::CachedResource&, char const*, int)
22  0x6ba8b0c9b WebCore::CachedRawResource::notifyClientsDataWasReceived(char const*, unsigned int)
23  0x6ba8b0a6b WebCore::CachedRawResource::updateBuffer(WebCore::SharedBuffer&)
24  0x6ba84335a WebCore::SubresourceLoader::didReceiveDataOrBuffer(char const*, int, WTF::RefPtr<WebCore::SharedBuffer, WTF::DumbPtrTraits<WebCore::SharedBuffer> >&&, long long, WebCore::DataPayloadType)
25  0x6ba843092 WebCore::SubresourceLoader::didReceiveData(char const*, unsigned int, long long, WebCore::DataPayloadType)
26  0x109fe2d06 WebKit::WebResourceLoader::didReceiveData(IPC::DataReference const&, long long)
27  0x109fe7460 void IPC::callMemberFunctionImpl<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>, 0ul, 1ul>(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>&&, std::__1::integer_sequence<unsigned long, 0ul, 1ul>)
28  0x109fe7390 void IPC::callMemberFunction<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>, std::__1::integer_sequence<unsigned long, 0ul, 1ul> >(std::__1::tuple<IPC::DataReference, long long>&&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long))
29  0x109fe6575 void IPC::handleMessage<Messages::WebResourceLoader::DidReceiveData, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long))
30  0x109fe5c66 WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&)
31  0x10943d0c9 WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
32  0x1097eab5c IPC::Connection::dispatchMessage(IPC::Decoder&)
33  0x1097dd6cd IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)
34  0x1097eb717 IPC::Connection::dispatchOneIncomingMessage()
35  0x1098098e8 IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14::operator()()
36  0x1098097f9 WTF::Function<void ()>::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14>::call()
37  0x6c877c18f WTF::Function<void ()>::operator()() const
38  0x6c87d4f83 WTF::RunLoop::performWork()
39  0x6c87d5934 WTF::RunLoop::performWork(void*)
40  0x7fff2e435a11 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
41  0x7fff2e4ef42c __CFRunLoopDoSource0
42  0x7fff2e418470 __CFRunLoopDoSources0
43  0x7fff2e4178ed __CFRunLoopRun
44  0x7fff2e417153 CFRunLoopRunSpecific
45  0x7fff2d701d96 RunCurrentEventLoopInMode
46  0x7fff2d701b06 ReceiveNextEventCommon
47  0x7fff2d701884 _BlockUntilNextEventMatchingListInModeWithFilter
48  0x7fff2b9b2a73 _DPSNextEvent
49  0x7fff2c148e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
50  0x7fff2b9a7885 -[NSApplication run]
51  0x7fff2b976a72 NSApplicationMain
52  0x7fff56619d77 _xpc_objc_main
53  0x7fff566189ca xpc_main
54  0x109068077 WebKit::XPCServiceMain()
55  0x10906836b main
56  0x7fff562bf015 start
57  0x1

Backtrace for token 178
1   0x6ba0a6a87 WebCore::Node::ref()
2   0x6b8463d68 WTF::Ref<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >::Ref(WebCore::Document&)
3   0x6b8463d2d WTF::Ref<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >::Ref(WebCore::Document&)
4   0x6b9a82d09 WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Document&)
5   0x6b9a99358 WebCore::createWrapperInline(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Node, WTF::DumbPtrTraits<WebCore::Node> >&&)
6   0x6b9a99080 WebCore::createWrapper(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WTF::Ref<WebCore::Node, WTF::DumbPtrTraits<WebCore::Node> >&&)
7   0x6b83223be WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Node&)
8   0x6b837bb90 WebCore::toJS(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Node*)
9   0x6b9a70fb3 WebCore::JSDOMWindowBase::updateDocument()
10  0x6b9ac2d63 WebCore::ScriptController::updateDocument()
11  0x6b9f6b86b WebCore::Document::didBecomeCurrentDocumentInFrame()
12  0x6ba99580b WebCore::Frame::setDocument(WTF::RefPtr<WebCore::Document, WTF::DumbPtrTraits<WebCore::Document> >&&)
13  0x6ba7b11ad WebCore::DocumentWriter::begin(WebCore::URL const&, bool, WebCore::Document*)
14  0x6ba770f7e WebCore::DocumentLoader::commitData(char const*, unsigned long)
15  0x109b50b92 WebKit::WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int)
16  0x6ba776add WebCore::DocumentLoader::commitLoad(char const*, int)
17  0x6ba7769fb WebCore::DocumentLoader::dataReceived(char const*, int)
18  0x6ba777278 WebCore::DocumentLoader::dataReceived(WebCore::CachedResource&, char const*, int)
19  0x6ba8b0c9b WebCore::CachedRawResource::notifyClientsDataWasReceived(char const*, unsigned int)
20  0x6ba8b0a6b WebCore::CachedRawResource::updateBuffer(WebCore::SharedBuffer&)
21  0x6ba84335a WebCore::SubresourceLoader::didReceiveDataOrBuffer(char const*, int, WTF::RefPtr<WebCore::SharedBuffer, WTF::DumbPtrTraits<WebCore::SharedBuffer> >&&, long long, WebCore::DataPayloadType)
22  0x6ba843092 WebCore::SubresourceLoader::didReceiveData(char const*, unsigned int, long long, WebCore::DataPayloadType)
23  0x109fe2d06 WebKit::WebResourceLoader::didReceiveData(IPC::DataReference const&, long long)
24  0x109fe7460 void IPC::callMemberFunctionImpl<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>, 0ul, 1ul>(WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>&&, std::__1::integer_sequence<unsigned long, 0ul, 1ul>)
25  0x109fe7390 void IPC::callMemberFunction<WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long), std::__1::tuple<IPC::DataReference, long long>, std::__1::integer_sequence<unsigned long, 0ul, 1ul> >(std::__1::tuple<IPC::DataReference, long long>&&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long))
26  0x109fe6575 void IPC::handleMessage<Messages::WebResourceLoader::DidReceiveData, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(IPC::DataReference const&, long long))
27  0x109fe5c66 WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&)
28  0x10943d0c9 WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
29  0x1097eab5c IPC::Connection::dispatchMessage(IPC::Decoder&)
30  0x1097dd6cd IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)
31  0x1097eb717 IPC::Connection::dispatchOneIncomingMessage()
32  0x1098098e8 IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14::operator()()
33  0x1098097f9 WTF::Function<void ()>::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_14>::call()
34  0x6c877c18f WTF::Function<void ()>::operator()() const
35  0x6c87d4f83 WTF::RunLoop::performWork()
36  0x6c87d5934 WTF::RunLoop::performWork(void*)
37  0x7fff2e435a11 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
38  0x7fff2e4ef42c __CFRunLoopDoSource0
39  0x7fff2e418470 __CFRunLoopDoSources0
40  0x7fff2e4178ed __CFRunLoopRun
41  0x7fff2e417153 CFRunLoopRunSpecific
42  0x7fff2d701d96 RunCurrentEventLoopInMode
43  0x7fff2d701b06 ReceiveNextEventCommon
44  0x7fff2d701884 _BlockUntilNextEventMatchingListInModeWithFilter
45  0x7fff2b9b2a73 _DPSNextEvent
46  0x7fff2c148e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
47  0x7fff2b9a7885 -[NSApplication run]
48  0x7fff2b976a72 NSApplicationMain
49  0x7fff56619d77 _xpc_objc_main
50  0x7fff566189ca xpc_main
51  0x109068077 WebKit::XPCServiceMain()
52  0x10906836b main
53  0x7fff562bf015 start
54  0x1

so this might be a GC-related issue, possibly via AccessibilityController.

[Radar WebKit Bug Importer]

<rdar://problem/43469575>

[Simon Fraser (smfr)]

GC inspector shows a ref from a function which is a "Protected values" root:

Function cell 0x6643f04b0 (GC root—Protected values)Internal 0
JSGlobalLexicalEnvironment cell 0x65f7c4050 Internal 0
Window cell 0x65f7d8fb0 Variable document
HTMLDocument cell 0x65f75c060 wrapped 0x664a02570 “file:///Volumes/Data/Development/apple/webkit/OpenSource/LayoutTests/accessibility/notification-listeners.html”

[Simon Fraser (smfr)]

Created attachment 349267 [details]
GC heap json

[Simon Fraser (smfr)]

On AccessibilityNotificationHandler is not being cleaned up, so one JSValueProtect(context, m_notificationFunctionCallback) is never matched by a a JSValueUnprotect().

[Simon Fraser (smfr)]

Created attachment 349269 [details]
Patch

[Darin Adler]

Comment on attachment 349269 [details]
Patch

Great fix, even better that an existing test works as a regression test for it. Also glad it was only a mistake in the test code

[WebKit Commit Bot]

Comment on attachment 349269 [details]
Patch

Clearing flags on attachment: 349269

Committed r235836: <https://trac.webkit.org/changeset/235836>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.