186223 2018-06-01 21:29:38 -0700 LayoutTests/fast/css/parsing-css-matches-7.html always abandons its Document (disabling JIT fixes it) 2018-06-03 21:13:50 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 simon.fraser ysuzuki ap commit-queue ews-watchlist fpizlo ggaren keith_miller mark.lam msaboff saam simon.fraser webkit-bug-importer ysuzuki oldest_to_newest 1429504 0 simon.fraser 2018-06-01 21:29:38 -0700 After running LayoutTests/fast/css/parsing-css-matches-7.html the Document never goes away. 1429515 1 simon.fraser 2018-06-01 22:36:17 -0700 Options::useConcurrentGC() = false does NOT fix the bug. Options::useJIT() = false DOES fix the bug. 1429516 2 simon.fraser 2018-06-01 22:37:27 -0700 Oddly almost any change simplify the test makes the bug go away. 1429517 3 simon.fraser 2018-06-01 22:38:55 -0700 GC heap dump doesn't show anything interesting, other than the fact that the JSHTMLDocument is kept alive by being visited from the JSGlobalObject (and thus the HTMLDocument lives). 1429518 4 webkit-bug-importer 2018-06-01 23:12:46 -0700 <rdar://problem/40744972> 1429571 5 simon.fraser 2018-06-02 10:03:10 -0700 Disabling the DFGJIT also fixes this. With the DFGJIT disabled, the document is released via: * frame #0: 0x000000010d3b49e6 WebCore`WebCore::Document::~Document(this=0x000000012a200fb8) at Document.cpp:585 frame #1: 0x000000010d757d95 WebCore`WebCore::HTMLDocument::~HTMLDocument(this=0x000000012a200fb8) at HTMLDocument.cpp:95 frame #2: 0x000000010d757db5 WebCore`WebCore::HTMLDocument::~HTMLDocument(this=0x000000012a200fb8) at HTMLDocument.cpp:95 frame #3: 0x000000010d757e59 WebCore`WebCore::HTMLDocument::~HTMLDocument(this=0x000000012a200fb8) at HTMLDocument.cpp:95 frame #4: 0x000000010d3b8300 WebCore`WebCore::Document::decrementReferencingNodeCount(this=0x000000012a200fb8) at Document.h:361 frame #5: 0x000000010d4e7e60 WebCore`WebCore::Node::~Node(this=0x0000000130d03db0) at Node.cpp:314 frame #6: 0x000000010d36c087 WebCore`WebCore::ContainerNode::~ContainerNode(this=0x0000000130d03db0) at ContainerNode.cpp:270 frame #7: 0x000000010d46001c WebCore`WebCore::Element::~Element(this=0x0000000130d03db0) at Element.cpp:199 frame #8: 0x000000010d579222 WebCore`WebCore::StyledElement::~StyledElement(this=0x0000000130d03db0) at StyledElement.cpp:66 frame #9: 0x000000010b8db1d5 WebCore`WebCore::HTMLElement::~HTMLElement(this=0x0000000130d03db0) at HTMLElement.h:38 frame #10: 0x000000010d8783c5 WebCore`WebCore::HTMLSpanElement::~HTMLSpanElement(this=0x0000000130d03db0) at HTMLSpanElement.h:32 frame #11: 0x000000010d8710c5 WebCore`WebCore::HTMLSpanElement::~HTMLSpanElement(this=0x0000000130d03db0) at HTMLSpanElement.h:32 frame #12: 0x000000010d8710e9 WebCore`WebCore::HTMLSpanElement::~HTMLSpanElement(this=0x0000000130d03db0) at HTMLSpanElement.h:32 frame #13: 0x000000010d4e85bb WebCore`WebCore::Node::removedLastRef(this=0x0000000130d03db0) at Node.cpp:2557 frame #14: 0x000000010d4e852c WebCore`WebCore::Node::deref(this=0x0000000130d03db0) at Node.cpp:365 frame #15: 0x000000010d4eaf55 WebCore`WebCore::Node::derefEventTarget(this=0x0000000130d03db0) at Node.cpp:817 frame #16: 0x000000010b8fe236 WebCore`WebCore::EventTarget::deref(this=0x0000000130d03db0) at EventTarget.h:64 frame #17: 0x000000010b8fe20f WebCore`WTF::Ref<WebCore::EventTarget, WTF::DumbPtrTraits<WebCore::EventTarget> >::~Ref(this=0x000000012f4147b8) at Ref.h:61 frame #18: 0x000000010b8ebdf5 WebCore`WTF::Ref<WebCore::EventTarget, WTF::DumbPtrTraits<WebCore::EventTarget> >::~Ref(this=0x000000012f4147b8) at Ref.h:55 frame #19: 0x000000010bd7a619 WebCore`WebCore::JSDOMWrapper<WebCore::EventTarget>::~JSDOMWrapper(this=0x000000012f4147a0) at JSDOMWrapper.h:72 frame #20: 0x000000010bd7a5f5 WebCore`WebCore::JSEventTarget::~JSEventTarget(this=0x000000012f4147a0) at JSEventTarget.h:31 frame #21: 0x000000010bd70f85 WebCore`WebCore::JSEventTarget::~JSEventTarget(this=0x000000012f4147a0) at JSEventTarget.h:31 frame #22: 0x000000010bd6d86d WebCore`WebCore::JSEventTarget::destroy(cell=0x000000012f4147a0) at JSEventTarget.cpp:227 frame #23: 0x0000000101edceaa JavaScriptCore`JSC::JSDestructibleObjectDestroyFunc::operator(this=0x00007ffeefbfe0e0, (null)=0x0000000126f00000, cell=0x000000012f4147a0)(JSC::VM&, JSC::JSCell*) const at JSDestructibleObjectHeapCellType.cpp:37 frame #24: 0x0000000101f119f5 JavaScriptCore`void JSC::MarkedBlock::Handle::specializedSweep<false, (JSC::MarkedBlock::Handle::EmptyMode)0, (JSC::MarkedBlock::Handle::SweepMode)0, (JSC::MarkedBlock::Handle::SweepDestructionMode)0, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)0, (JSC::MarkedBlock::Handle::MarksMode)0, JSC::JSDestructibleObjectDestroyFunc>(this=0x00007ffeefbfdfb0, cell=0x000000012f4147a0)::'lambda'(void*)::operator()(void*) const at MarkedBlockInlines.h:255 frame #25: 0x0000000101f0c566 JavaScriptCore`void JSC::MarkedBlock::Handle::specializedSweep<false, (JSC::MarkedBlock::Handle::EmptyMode)0, (JSC::MarkedBlock::Handle::SweepMode)0, (JSC::MarkedBlock::Handle::SweepDestructionMode)0, (JSC::MarkedBlock::Handle::ScribbleMode)0, (JSC::MarkedBlock::Handle::NewlyAllocatedMode)0, (JSC::MarkedBlock::Handle::MarksMode)0, JSC::JSDestructibleObjectDestroyFunc>(this=0x0000000130ace550, freeList=0x0000000000000000, emptyMode=IsEmpty, sweepMode=SweepOnly, destructionMode=BlockHasDestructors, scribbleMode=Scribble, newlyAllocatedMode=DoesNotHaveNewlyAllocated, marksMode=MarksStale, destroyFunc=0x00007ffeefbfe0e0) at MarkedBlockInlines.h:289 frame #26: 0x0000000101edce40 JavaScriptCore`void JSC::MarkedBlock::Handle::finishSweepKnowingHeapCellType<JSC::JSDestructibleObjectDestroyFunc>(this=0x0000000130ace550, freeList=0x0000000000000000, destroyFunc=0x00007ffeefbfe0e0) at MarkedBlockInlines.h:434 frame #27: 0x0000000101edcd08 JavaScriptCore`JSC::JSDestructibleObjectHeapCellType::finishSweep(this=0x00000001226fa100, handle=0x0000000130ace550, freeList=0x0000000000000000) at JSDestructibleObjectHeapCellType.cpp:52 frame #28: 0x0000000101a907c6 JavaScriptCore`JSC::Subspace::finishSweep(this=0x00000001270f7e10, block=0x0000000130ace550, freeList=0x0000000000000000) at Subspace.cpp:65 frame #29: 0x0000000101a75387 JavaScriptCore`JSC::MarkedBlock::Handle::sweep(this=0x0000000130ace550, freeList=0x0000000000000000) at MarkedBlock.cpp:432 frame #30: 0x00000001019ff194 JavaScriptCore`JSC::BlockDirectory::sweep(this=0x00007ffeefbfe2d0, index=10)::$_9::operator()(unsigned long) const at BlockDirectory.cpp:297 frame #31: 0x00000001019fbd0c JavaScriptCore`void WTF::FastBitVectorImpl<WTF::FastBitVectorWordOwner>::forEachSetBit<JSC::BlockDirectory::sweep(this=0x0000000122650ce8, func=0x00007ffeefbfe2d0)::$_9>(JSC::BlockDirectory::sweep()::$_9 const&) const at FastBitVector.h:347 frame #32: 0x00000001019fbc89 JavaScriptCore`JSC::BlockDirectory::sweep(this=0x0000000122650c60) at BlockDirectory.cpp:294 frame #33: 0x0000000101a83299 JavaScriptCore`JSC::MarkedSpace::sweep(this=0x00007ffeefbfe350, directory=0x0000000122650c60)::$_9::operator()(JSC::BlockDirectory&) const at MarkedSpace.cpp:236 frame #34: 0x0000000101a7795f JavaScriptCore`void JSC::MarkedSpace::forEachDirectory<JSC::MarkedSpace::sweep()::$_9>(this=0x0000000126f00138, functor=0x00007ffeefbfe350)::$_9 const&) at MarkedSpace.h:236 frame #35: 0x0000000101a77915 JavaScriptCore`JSC::MarkedSpace::sweep(this=0x0000000126f00138) at MarkedSpace.cpp:234 frame #36: 0x0000000101a1209a JavaScriptCore`JSC::Heap::sweepSynchronously(this=0x0000000126f00040) at Heap.cpp:1019 frame #37: 0x0000000101a125b1 JavaScriptCore`JSC::Heap::collectNow(this=0x0000000126f00040, synchronousness=Sync, request=GCRequest @ 0x00007ffeefbfe450) at Heap.cpp:1060 frame #38: 0x000000010ceba470 WebCore`WebCore::GCController::garbageCollectNow(this=0x00000001101c7900) at GCController.cpp:98 frame #39: 0x00000001198b7d8d WebKitLegacy`::+[WebCoreStatistics garbageCollectJavaScriptObjects](self=WebCoreStatistics, _cmd="garbageCollectJavaScriptObjects") at WebCoreStatistics.mm:115 frame #40: 0x000000010002259c DumpRenderTree`runTest(inputLine="/Volumes/Data/Development/apple/webkit/OpenSource/LayoutTests/fast/css/parsing-css-matches-8.html") at DumpRenderTree.mm:2100 frame #41: 0x000000010001f483 DumpRenderTree`dumpRenderTree(argc=3, argv=0x00007ffeefbff5e8) at DumpRenderTree.mm:1277 frame #42: 0x0000000100022e72 DumpRenderTree`DumpRenderTreeMain(argc=3, argv=0x00007ffeefbff5e8) at DumpRenderTree.mm:1398 frame #43: 0x00000001000a7472 DumpRenderTree`main(argc=3, argv=0x00007ffeefbff5e8) at DumpRenderTreeMain.mm:34 frame #44: 0x00007fff5b8d9015 libdyld.dylib`start + 1 frame #45: 0x00007fff5b8d9015 libdyld.dylib`start + 1 1429576 6 simon.fraser 2018-06-02 12:33:43 -0700 When the DFGJIT is enabled, the JSDOMWindow is treated as a conservative root via gatherScratchBufferRoots(). 1429579 7 simon.fraser 2018-06-02 12:50:27 -0700 The relevant scratch buffer is a size 24 buffer allocated via: (lldb) bt * thread #61, name = 'WTF::AutomaticThread', stop reason = breakpoint 10.1 * frame #0: 0x000000011629d6c6 JavaScriptCore`JSC::VM::scratchBufferForSize(this=0x0000000129000a00, size=24) at VM.cpp:1220 frame #1: 0x00000001156d7cf0 JavaScriptCore`JSC::DFG::JITCompiler::makeCatchOSREntryBuffer(this=0x00007000034b62a0) at DFGJITCompiler.cpp:696 frame #2: 0x00000001156d84d5 JavaScriptCore`JSC::DFG::JITCompiler::compileFunction(this=0x00007000034b62a0) at DFGJITCompiler.cpp:427 frame #3: 0x000000011580559d JavaScriptCore`JSC::DFG::Plan::compileInThreadImpl(this=0x0000000128f73bc0) at DFGPlan.cpp:386 frame #4: 0x0000000115802bf2 JavaScriptCore`JSC::DFG::Plan::compileInThread(this=0x0000000128f73bc0, threadData=0x0000000124d00560) at DFGPlan.cpp:187 frame #5: 0x0000000115a6d25c JavaScriptCore`JSC::DFG::Worklist::ThreadBody::work(this=0x0000000124d00580) at DFGWorklist.cpp:111 frame #6: 0x0000000114e3b497 JavaScriptCore`WTF::AutomaticThread::start(this=0x000000012fff8d38)::$_0::operator()() const at AutomaticThread.cpp:222 frame #7: 0x0000000114e3b0d9 JavaScriptCore`WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(this=0x000000012fff8d30)::$_0>::call() at Function.h:101 frame #8: 0x0000000114e4b9db JavaScriptCore`WTF::Function<void ()>::operator(this=0x00007000034b6ec0)() const at Function.h:56 frame #9: 0x0000000114ecee9f JavaScriptCore`WTF::Thread::entryPoint(newThreadContext=0x000000012fff3050) at Threading.cpp:136 frame #10: 0x0000000114ed4815 JavaScriptCore`WTF::wtfThreadEntryPoint(context=0x000000012fff3050) at ThreadingPthreads.cpp:223 frame #11: 0x0000000104b0f665 libsystem_pthread.dylib`_pthread_body + 340 frame #12: 0x0000000104b0f511 libsystem_pthread.dylib`_pthread_start + 377 frame #13: 0x0000000104b0ebfd libsystem_pthread.dylib`thread_start + 13 1429585 8 simon.fraser 2018-06-02 13:42:16 -0700 Scratch buffers can be created off the main thread: 2 0x11629d5e9 JSC::VM::scratchBufferForSize(unsigned long) 3 0x1156d7c10 JSC::DFG::JITCompiler::makeCatchOSREntryBuffer() 4 0x1156d83f5 JSC::DFG::JITCompiler::compileFunction() 5 0x1158054bd JSC::DFG::Plan::compileInThreadImpl() 6 0x115802b12 JSC::DFG::Plan::compileInThread(JSC::DFG::ThreadData*) 7 0x115a6d17c JSC::DFG::Worklist::ThreadBody::work() 8 0x114e3b3b7 WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0::operator()() const 9 0x114e3aff9 WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>::call() 10 0x114e4b8fb WTF::Function<void ()>::operator()() const 11 0x114ecedbf WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) 12 0x114ed4735 WTF::wtfThreadEntryPoint(void*) 1429586 9 simon.fraser 2018-06-02 13:52:18 -0700 Also ScratchBuffer::dataBuffer() can be called off the main thread: 2 0x11573e1e5 JSC::ScratchBuffer::dataBuffer() 3 0x1158bfa56 JSC::DFG::SpeculativeJIT::compileExtractCatchLocal(JSC::DFG::Node*) 4 0x11586a168 JSC::DFG::SpeculativeJIT::compile(JSC::DFG::Node*) 5 0x11585cbba JSC::DFG::SpeculativeJIT::compileCurrentBlock() 6 0x11586b7a3 JSC::DFG::SpeculativeJIT::compile() 7 0x1156d3df7 JSC::DFG::JITCompiler::compileBody() 8 0x1156d88c5 JSC::DFG::JITCompiler::compileFunction() 9 0x1158054bd JSC::DFG::Plan::compileInThreadImpl() 10 0x115802b12 JSC::DFG::Plan::compileInThread(JSC::DFG::ThreadData*) 11 0x115a6d17c JSC::DFG::Worklist::ThreadBody::work() 12 0x114e3b377 WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0::operator()() const 13 0x114e3afb9 WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>::call() 14 0x114e4b8bb WTF::Function<void ()>::operator()() const 15 0x114eced7f WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) 1429595 10 simon.fraser 2018-06-02 14:23:49 -0700 A hack to zero out all scratch buffers on full GC fixes this bug. 1429603 11 ysuzuki 2018-06-02 15:41:27 -0700 The problem here is that catchOSREntryBuffer's active length is set in non-JIT code, but nobody sets 0 after using it. 1429604 12 ysuzuki 2018-06-02 15:42:03 -0700 (In reply to Simon Fraser (smfr) from comment #9) > Also ScratchBuffer::dataBuffer() can be called off the main thread: > > 2 0x11573e1e5 JSC::ScratchBuffer::dataBuffer() > 3 0x1158bfa56 > JSC::DFG::SpeculativeJIT::compileExtractCatchLocal(JSC::DFG::Node*) > 4 0x11586a168 JSC::DFG::SpeculativeJIT::compile(JSC::DFG::Node*) > 5 0x11585cbba JSC::DFG::SpeculativeJIT::compileCurrentBlock() > 6 0x11586b7a3 JSC::DFG::SpeculativeJIT::compile() > 7 0x1156d3df7 JSC::DFG::JITCompiler::compileBody() > 8 0x1156d88c5 JSC::DFG::JITCompiler::compileFunction() > 9 0x1158054bd JSC::DFG::Plan::compileInThreadImpl() > 10 0x115802b12 JSC::DFG::Plan::compileInThread(JSC::DFG::ThreadData*) > 11 0x115a6d17c JSC::DFG::Worklist::ThreadBody::work() > 12 0x114e3b377 WTF::AutomaticThread::start(WTF::AbstractLocker > const&)::$_0::operator()() const > 13 0x114e3afb9 WTF::Function<void > ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker > const&)::$_0>::call() > 14 0x114e4b8bb WTF::Function<void ()>::operator()() const > 15 0x114eced7f WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) Nice catch! 1429617 13 341855 ysuzuki 2018-06-02 16:39:57 -0700 Created attachment 341855 Patch 1429656 14 simon.fraser 2018-06-03 08:54:11 -0700 I can confirm that this patch fixes the bug. 1429746 15 341855 keith_miller 2018-06-03 20:27:01 -0700 Comment on attachment 341855 Patch r=me. 1429751 16 341855 ysuzuki 2018-06-03 20:46:48 -0700 Comment on attachment 341855 Patch Thanks! 1429759 17 341855 commit-queue 2018-06-03 21:13:48 -0700 Comment on attachment 341855 Patch Clearing flags on attachment: 341855 Committed r232461: <https://trac.webkit.org/changeset/232461> 1429760 18 commit-queue 2018-06-03 21:13:50 -0700 All reviewed patches have been landed. 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