[Webkit-unassigned] [Bug 160283] New: [JSC Debug] ASSERTION FAILED: The Compare should have been eliminated, it is known to be always false.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160283

            Bug ID: 160283
           Summary: [JSC Debug] ASSERTION FAILED: The Compare should have
                    been eliminated, it is known to be always false.
    Classification: Unclassified
           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: ryanhaddad at apple.com

Created attachment 284753
  --> https://bugs.webkit.org/attachment.cgi?id=284753&action=review
Crashlog

Intermittent assertion failure seen on Yosemite JSC Debug with regress/script-tests/Float32Array-matrix-mult.js.dfg-eager

https://build.webkit.org/builders/Apple%20Yosemite%20Debug%20JSC%20%28Tests%29/builds/6555

regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: ASSERTION FAILED: The Compare should have been eliminated, it is known to be always false.
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: !masqueradesAsUndefinedWatchpointIsStillValid() || !isKnownCell(operand.node())
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: /Volumes/Data/slave/yosemite-debug/build/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp(219) : void JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeCompareNullOrUndefined(JSC::DFG::Edge)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 1   0x10e72ea50 WTFCrash
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 2   0x10ddf12a9 JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeCompareNullOrUndefined(JSC::DFG::Edge)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 3   0x10dd9ff11 JSC::DFG::SpeculativeJIT::compare(JSC::DFG::Node*, JSC::MacroAssemblerX86Common::RelationalCondition, JSC::MacroAssemblerX86Common::DoubleCondition, unsigned long (*)(JSC::ExecState*, long long, long long))
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 4   0x10ddfe2c7 JSC::DFG::SpeculativeJIT::compile(JSC::DFG::Node*)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 5   0x10dd8e1bc JSC::DFG::SpeculativeJIT::compileCurrentBlock()
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 6   0x10dd8e996 JSC::DFG::SpeculativeJIT::compile()
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 7   0x10dc5cc17 JSC::DFG::JITCompiler::compileBody()
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 8   0x10dc60690 JSC::DFG::JITCompiler::compileFunction()
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 9   0x10dd4d2cb JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 10  0x10dd4be42 JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 11  0x10de8f286 JSC::DFG::Worklist::runThread(JSC::DFG::ThreadData*)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 12  0x10de8cf94 JSC::DFG::Worklist::threadFunction(void*)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 13  0x10e7a1989 WTF::createThread(void (*)(void*), void*, char const*)::$_0::operator()() const
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 14  0x10e7a195d void std::__1::__invoke_void_return_wrapper<void>::__call<WTF::createThread(void (*)(void*), void*, char const*)::$_0&>(WTF::createThread(void (*)(void*), void*, char const*)::$_0&&&)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 15  0x10e7a18fc std::__1::__function::__func<WTF::createThread(void (*)(void*), void*, char const*)::$_0, std::__1::allocator<WTF::createThread(void (*)(void*), void*, char const*)::$_0>, void ()>::operator()()
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 16  0x10ddb546a std::__1::function<void ()>::operator()() const
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 17  0x10e7a055e WTF::threadEntryPoint(void*)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 18  0x10e7a2001 WTF::wtfThreadEntryPoint(void*)
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 19  0x7fff8103905a _pthread_body
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 20  0x7fff81038fd7 _pthread_body
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: 21  0x7fff810363ed thread_start
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: test_script_19003: line 2: 71759 Segmentation fault: 11  ( "$@" ../../../.vm/JavaScriptCore.framework/Resources/jsc --useFTLJIT\=false --useFunctionDotArguments\=true --maxPerThreadStackUsage\=1572864 --thresholdForJITAfterWarmUp\=10 --thresholdForJITSoon\=10 --thresholdForOptimizeAfterWarmUp\=20 --thresholdForOptimizeAfterLongWarmUp\=20 --thresholdForOptimizeSoon\=20 --thresholdForFTLOptimizeAfterWarmUp\=20 --thresholdForFTLOptimizeSoon\=20 --maximumEvalCacheableSourceLength\=150000 Float32Array-matrix-mult.js )
regress/script-tests/Float32Array-matrix-mult.js.dfg-eager: ERROR: Unexpected exit code: 139
FAIL: regress/script-tests/Float32Array-matrix-mult.js.dfg-eager

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