Bug 136974 – JSStringRef leak on the leaks bot allocation under selectTextWithCriteriaCallback

• Component: WebKit Misc.
• Status: RESOLVED FIXED

[Joseph Pecoraro]

JSStringRef leak seen on the leaks bots:
<http://build.webkit.org/builders/Apple%20MountainLion%20%28Leaks%29/builds/11637/steps/layout-test/logs/stdio>

Seems to come from the test code itself (selectTextWithCriteriaCallback in AccessibilityUIElement.cpp).

Leak: 0x7fcdb0a29b10  size=32  zone: DefaultMallocZone_0x10a6e9000
	0x00000001 0x70000000 0xb1014700 0x00007fcd 	.......p.G......
	0x00000000 0x00000000 0xdb1094ea 0x000207fc 	................
	Call stack: [thread 0x7fff782d9180]: 
        | 0x2 
        | start 
        | main DumpRenderTreeMain.mm:30 
        | DumpRenderTreeMain(int, char const**) DumpRenderTree.mm:1295 
        | dumpRenderTree(int, char const**) DumpRenderTree.mm:1164 
        | runTestingServerLoop() DumpRenderTree.mm:1073 
        | runTest(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) DumpRenderTree.mm:1853 
        | CFRunLoopRunSpecific 
        | __CFRunLoopRun 
        | __CFRunLoopDoSources0 
        | __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 
        | MultiplexerSource::perform() 
        | RunloopBlockContext::perform() 
        | CFArrayApplyFunction 
        | __block_global_1 
        | ___withDelegateAsync_block_invoke_0 
        | ___delegate_didReceiveDataArray_block_invoke_0 
        | _NSURLConnectionDidReceiveDataArray 
        | -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] 
        | -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] 
        | __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke_0 
        | -[WebCoreResourceHandleAsDelegate connection:didReceiveDataArray:] WebCoreResourceHandleAsDelegate.mm:200 
        | WebCore::ResourceLoader::didReceiveBuffer(WebCore::ResourceHandle*, WTF::PassRefPtr<WebCore::SharedBuffer>, int) ResourceLoader.cpp:506 
        | WebCore::SubresourceLoader::didReceiveBuffer(WTF::PassRefPtr<WebCore::SharedBuffer>, long long, WebCore::DataPayloadType) SubresourceLoader.cpp:258 
        | WebCore::SubresourceLoader::didReceiveDataOrBuffer(char const*, int, WTF::PassRefPtr<WebCore::SharedBuffer>, long long, WebCore::DataPayloadType) SubresourceLoader.cpp:277 
        | WebCore::CachedRawResource::addDataBuffer(WebCore::ResourceBuffer*) CachedRawResource.cpp:72 
        | WebCore::CachedRawResource::notifyClientsDataWasReceived(char const*, unsigned int) CachedRawResource.cpp:117 
        | WebCore::DocumentLoader::dataReceived(WebCore::CachedResource*, char const*, int) DocumentLoader.cpp:891 
        | WebCore::DocumentLoader::commitLoad(char const*, int) DocumentLoader.cpp:771 
        | WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) WebFrameLoaderClient.mm:988 
        | -[WebDataSource(WebInternal) _receivedData:] WebDataSource.mm:252 
        | -[WebHTMLRepresentation receivedData:withDataSource:] WebHTMLRepresentation.mm:191 
        | -[WebFrame(WebInternal) _commitData:] WebFrame.mm:1002 
        | WebCore::DocumentLoader::commitData(char const*, unsigned long) DocumentLoader.cpp:846 
        | WebCore::DocumentWriter::addData(char const*, unsigned long) DocumentWriter.cpp:224 
        | WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&, char const*, unsigned long) DecodedDataDocumentParser.cpp:50 
        | WebCore::HTMLDocumentParser::append(WTF::PassRefPtr<WTF::StringImpl>) HTMLDocumentParser.cpp:430 
        | WebCore::HTMLDocumentParser::pumpTokenizerIfPossible(WebCore::HTMLDocumentParser::SynchronousMode) HTMLDocumentParser.cpp:190 
        | WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) HTMLDocumentParser.cpp:293 
        | WebCore::HTMLDocumentParser::canTakeNextToken(WebCore::HTMLDocumentParser::SynchronousMode, WebCore::PumpSession&) HTMLDocumentParser.cpp:238 
        | WebCore::HTMLDocumentParser::runScriptsForPausedTreeBuilder() HTMLDocumentParser.cpp:218 
        | WebCore::HTMLScriptRunner::execute(WTF::PassRefPtr<WebCore::Element>, WTF::TextPosition const&) HTMLScriptRunner.cpp:177 
        | WebCore::HTMLScriptRunner::runScript(WebCore::Element*, WTF::TextPosition const&) HTMLScriptRunner.cpp:304 
        | WebCore::ScriptElement::prepareScript(WTF::TextPosition const&, WebCore::ScriptElement::LegacyTypeSupport) ScriptElement.cpp:237 
        | WebCore::ScriptElement::executeScript(WebCore::ScriptSourceCode const&) ScriptElement.cpp:301 
        | WebCore::ScriptController::evaluate(WebCore::ScriptSourceCode const&) ScriptController.cpp:168 
        | WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&) ScriptController.cpp:152 
        | WebCore::JSMainThreadExecState::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*) JSMainThreadExecState.h:62 
        | JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*) Completion.cpp:82 
        | JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::JSObject*) Interpreter.cpp:928 
        | JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) JITCode.cpp:56 
        | vmEntryToJavaScript 
        | llint_entry 
        | llint_slow_path_call LLIntSlowPaths.cpp:1160 
        | JSC::LLInt::genericCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind) LLIntSlowPaths.cpp:1154 
        | JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) LLIntSlowPaths.cpp:1090 
        | JSC::LLInt::handleHostCall(JSC::ExecState*, JSC::Instruction*, JSC::JSValue, JSC::CodeSpecializationKind) LLIntSlowPaths.cpp:1044 
        | long long JSC::APICallbackFunction::call<JSC::JSCallbackFunction>(JSC::ExecState*) APICallbackFunction.h:61 
        | selectTextWithCriteriaCallback(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSValue*, unsigned long, OpaqueJSValue const* const*, OpaqueJSValue const**) AccessibilityUIElement.cpp:273 
        | JSValueToStringCopy JSValueRef.cpp:416 
        | OpaqueJSString::create(WTF::String const&) OpaqueJSString.cpp:41 
        | WTF::ThreadSafeRefCountedBase::operator new(unsigned long) ThreadSafeRefCounted.h:70 
        | WTF::fastMalloc(unsigned long) FastMalloc.cpp:282 
        | malloc 
        | malloc_zone_malloc

[Joseph Pecoraro]

* STEPS TO REPRODUCE
shell> ./Tools/Scripts/run-webkit-tests --release platform/mac/accessibility/select-text.html --leaks

[Joseph Pecoraro]

Created attachment 238406 [details]
[PATCH] Proposed Fix

[WebKit Commit Bot]

Comment on attachment 238406 [details]
[PATCH] Proposed Fix

Clearing flags on attachment: 238406

Committed r173789: <http://trac.webkit.org/changeset/173789>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.