Created attachment 331979 [details] crash log stress/lexical-let-tdz.js.dfg-eager-no-cjit-validate failed on the following Release JSC test run: https://build.webkit.org/builders/Apple%20High%20Sierra%20Release%20JSC%20%28Tests%29/builds/1898 stress/lexical-let-tdz.js.dfg-eager-no-cjit-validate: test_script_15004: line 2: 48035 Segmentation fault: 11 ( "$@" ../../.vm/JavaScriptCore.framework/Resources/jsc --useFTLJIT\=false --useFunctionDotArguments\=true --validateExceptionChecks\=true --useDollarVM\=true --maxPerThreadStackUsage\=1572864 --validateGraph\=true --useConcurrentJIT\=false --thresholdForJITAfterWarmUp\=100 --scribbleFreeCells\=true --thresholdForJITAfterWarmUp\=10 --thresholdForJITSoon\=10 --thresholdForOptimizeAfterWarmUp\=20 --thresholdForOptimizeAfterLongWarmUp\=20 --thresholdForOptimizeSoon\=20 --thresholdForFTLOptimizeAfterWarmUp\=20 --thresholdForFTLOptimizeSoon\=20 --maximumEvalCacheableSourceLength\=150000 --useEagerCodeBlockJettisonTiming\=true --collectContinuously\=true --useGenerationalGC\=false lexical-let-tdz.js ) stress/lexical-let-tdz.js.dfg-eager-no-cjit-validate: ERROR: Unexpected exit code: 139 FAIL: stress/lexical-let-tdz.js.dfg-eager-no-cjit-validate Here is a crashlog from the bot that seems to match up with the failure: Thread 7 Crashed:: WTF::AutomaticThread 0 com.apple.JavaScriptCore 0x000000010874b2a9 JSC::SlotVisitor::drain(WTF::MonotonicTime)::$_10::operator()(JSC::MarkStackArray&) const + 329 (SlotVisitor.cpp:382) 1 com.apple.JavaScriptCore 0x0000000108746ab2 JSC::SlotVisitor::drain(WTF::MonotonicTime) + 146 (SlotVisitorInlines.h:188) 2 com.apple.JavaScriptCore 0x00000001087473ad JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode, WTF::MonotonicTime) + 1213 (SlotVisitor.cpp:669) 3 com.apple.JavaScriptCore 0x000000010872dc2c WTF::SharedTaskFunctor<void (), JSC::Heap::runBeginPhase(JSC::GCConductor)::$_14>::run() + 156 (Heap.cpp:1259) 4 com.apple.JavaScriptCore 0x0000000108cc8bbc WTF::ParallelHelperClient::runTask(WTF::RefPtr<WTF::SharedTask<void ()>, WTF::DumbPtrTraits<WTF::SharedTask<void ()> > >) + 44 (ParallelHelperPool.cpp:115) 5 com.apple.JavaScriptCore 0x0000000108cc9630 WTF::ParallelHelperPool::Thread::work() + 48 (ParallelHelperPool.cpp:194) 6 com.apple.JavaScriptCore 0x0000000108ca05c8 WTF::Function<void ()>::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>::call() + 296 (AutomaticThread.cpp:223) 7 com.apple.JavaScriptCore 0x0000000108ce2db4 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) + 228 (Threading.cpp:130) 8 com.apple.JavaScriptCore 0x0000000108ce4469 WTF::wtfThreadEntryPoint(void*) + 9 (ThreadingPthreads.cpp:224) 9 libsystem_pthread.dylib 0x00007fff525f06c1 _pthread_body + 340 10 libsystem_pthread.dylib 0x00007fff525f056d _pthread_start + 377 11 libsystem_pthread.dylib 0x00007fff525efc5d thread_start + 13
<rdar://problem/36755325>
*** This bug has been marked as a duplicate of bug 183229 ***