[Webkit-unassigned] [Bug 176470] New: ASSERTION FAILED: op() == CheckStructure in Source/JavaScriptCore/dfg/DFGNode.h(443)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176470

            Bug ID: 176470
           Summary: ASSERTION FAILED: op() == CheckStructure in
                    Source/JavaScriptCore/dfg/DFGNode.h(443)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jlewis3 at apple.com
                CC: mark.lam at apple.com, ryanhaddad at apple.com

The test stress/phantom-spread-forward-varargs.js.ftl-eager has had a flaky assertion failure on El Capitan JSC Debug testers

ASSERTION FAILED: op() == CheckStructure
/Volumes/Data/slave/elcapitan-debug/build/Source/JavaScriptCore/dfg/DFGNode.h(443) : void JSC::DFG::Node::convertToCheckStructureImmediate(JSC::DFG::Node *)
1   0x1066ecd40 WTFCrash
2   0x105b04ec0 JSC::DFG::Node::convertToCheckStructureImmediate(JSC::DFG::Node*)
3   0x105afa3be void JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::handleNode<JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::promoteLocalHeap()::'lambda1'(JSC::DFG::PromotedHeapLocation, JSC::DFG::LazyNode), JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::promoteLocalHeap()::'lambda1'(JSC::DFG::PromotedHeapLocation)>(JSC::DFG::Node*, JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::promoteLocalHeap()::'lambda1'(JSC::DFG::PromotedHeapLocation, JSC::DFG::LazyNode) const&, JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::promoteLocalHeap()::'lambda1'(JSC::DFG::PromotedHeapLocation) const&)
4   0x105ae0338 JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::promoteLocalHeap()
5   0x105adcc03 JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::performSinking()
6   0x105adc852 JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase::run()
7   0x105adc2a2 bool JSC::DFG::runAndLog<JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase>(JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase&)
8   0x105adc1fe bool JSC::DFG::runPhase<JSC::DFG::(anonymous namespace)::ObjectAllocationSinkingPhase>(JSC::DFG::Graph&)
9   0x105adc1c5 JSC::DFG::performObjectAllocationSinking(JSC::DFG::Graph&)
10  0x105b90c58 JSC::DFG::Plan::compileInThreadImpl()
11  0x105b8cc5d JSC::DFG::Plan::compileInThread(JSC::DFG::ThreadData*)
12  0x105d1fece JSC::DFG::Worklist::ThreadBody::work()
13  0x1066fa82e WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0::operator()() const
14  0x1066fa50c WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>::call()
15  0x10672647e WTF::Function<void ()>::operator()() const
16  0x106775f0a WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*)
17  0x10677b8f5 WTF::wtfThreadEntryPoint(void*)
18  0x7fff8513b99d _pthread_body
19  0x7fff8513b91a _pthread_body
20  0x7fff85139351 thread_start
test_script_16221: line 2: 33007 Segmentation fault: 11  ( "$@" ../../.vm/JavaScriptCore.framework/Resources/jsc --useFTLJIT\=false --useFunctionDotArguments\=true --maxPerThreadStackUsage\=1572864 --airForceBriggsAllocator\=true --useFTLJIT\=true --thresholdForJITAfterWarmUp\=10 --thresholdForJITSoon\=10 --thresholdForOptimizeAfterWarmUp\=20 --thresholdForOptimizeAfterLongWarmUp\=20 --thresholdForOptimizeSoon\=20 --thresholdForFTLOptimizeAfterWarmUp\=20 --thresholdForFTLOptimizeSoon\=20 --maximumEvalCacheableSourceLength\=150000 --useEagerCodeBlockJettisonTiming\=true phantom-spread-forward-varargs.js )
ERROR: Unexpected exit code: 139

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