Bug 139197 – Assertion failure in DFG::Node::varNumber() (hasVarNumber()) at apple.com

• Status: NEW
• Component: JavaScriptCore

To reproduce the bug, navigate to http://www.apple.com/. The result is

ASSERTION FAILED: hasVarNumber()
Source/JavaScriptCore/dfg/DFGNode.h(891) : int JSC::DFG::Node::varNumber()
1   0x10e8d7060 WTFCrash
2   0x10e0fca85 JSC::DFG::Node::varNumber()
3   0x10e13f1d5 void JSC::DFG::clobberize<JSC::DFG::ReadMethodClobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> >, JSC::DFG::WriteMethodClobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> >, JSC::DFG::DefMethodClobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> > >(JSC::DFG::Graph&, JSC::DFG::Node*, JSC::DFG::ReadMethodClobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> > const&, JSC::DFG::WriteMethodClobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> > const&, JSC::DFG::DefMethodClobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> > const&)
4   0x10e13aee7 void JSC::DFG::clobberize<JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps> >(JSC::DFG::Graph&, JSC::DFG::Node*, JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps>&)
5   0x10e134fe6 JSC::DFG::(anonymous namespace)::LocalCSEPhase::BlockCSE<JSC::DFG::(anonymous namespace)::LocalCSEPhase::SmallMaps>::run(JSC::DFG::BasicBlock*)
6   0x10e134b00 JSC::DFG::(anonymous namespace)::LocalCSEPhase::run()
7   0x10e134855 bool JSC::DFG::runAndLog<JSC::DFG::(anonymous namespace)::LocalCSEPhase>(JSC::DFG::(anonymous namespace)::LocalCSEPhase&)
8   0x10e12cd1f bool JSC::DFG::runPhase<JSC::DFG::(anonymous namespace)::LocalCSEPhase>(JSC::DFG::Graph&)
9   0x10e12ccc8 JSC::DFG::performLocalCSE(JSC::DFG::Graph&)
10  0x10e25bf0d JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&)
11  0x10e25b53d JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*)
12  0x10e3438b4 JSC::DFG::Worklist::runThread(JSC::DFG::ThreadData*)
13  0x10e341294 JSC::DFG::Worklist::threadFunction(void*)
14  0x10e92f7f9 WTF::createThread(void (*)(void*), void*, char const*)::$_0::operator()() const
15  0x10e92f7cc std::__1::__function::__func<WTF::createThread(void (*)(void*), void*, char const*)::$_0, std::__1::allocator<WTF::createThread(void (*)(void*), void*, char const*)::$_0>, void ()>::operator()()
16  0x10e903001 std::__1::function<void ()>::operator()() const
17  0x10e92e5de WTF::threadEntryPoint(void*)
18  0x10e92ff6c WTF::wtfThreadEntryPoint(void*)
19  0x108c41268 _pthread_body
20  0x108c411e5 _pthread_body
21  0x108c3f41d thread_start

<rdar://problem/19119717>