Bug 172959 – Flaky JSC Release test: exceptionFuzz.yaml/exceptionFuzz/date-format-xparb.js

• Component: JavaScriptCore
• Status: RESOLVED CONFIGURATION CHANGED

[Ryan Haddad]

Created attachment 312053 [details]
Crashlog

Flaky JSC Release test: exceptionFuzz.yaml/exceptionFuzz/date-format-xparb.js

https://build.webkit.org/builders/Apple%20Sierra%20Release%20JSC%20%28Tests%29/builds/1746
https://build.webkit.org/builders/Apple%20Sierra%20Release%20JSC%20%28Tests%29/builds/1754

Thread 6 Crashed:: WTF::AutomaticThread
0   com.apple.JavaScriptCore      	0x00000001015be40a void JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::stepOverInstruction<JSC::BytecodeGraph<JSC::CodeBlock>, void JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::stepOverInstruction<JSC::BytecodeGraph<JSC::CodeBlock> >(JSC::BytecodeGraph<JSC::CodeBlock>&, unsigned int, WTF::FastBitVector&)::'lambda'(unsigned int), void JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::stepOverInstruction<JSC::BytecodeGraph<JSC::CodeBlock> >(JSC::BytecodeGraph<JSC::CodeBlock>&, unsigned int, WTF::FastBitVector&)::'lambda0'(unsigned int)>(JSC::BytecodeGraph<JSC::CodeBlock>&, unsigned int, WTF::FastBitVector&, void JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::stepOverInstruction<JSC::BytecodeGraph<JSC::CodeBlock> >(JSC::BytecodeGraph<JSC::CodeBlock>&, unsigned int, WTF::FastBitVector&)::'lambda'(unsigned int) const&, void JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::stepOverInstruction<JSC::BytecodeGraph<JSC::CodeBlock> >(JSC::BytecodeGraph<JSC::CodeBlock>&, unsigned int, WTF::FastBitVector&)::'lambda0'(unsigned int) const&) + 42 (BytecodeLivenessAnalysisInlines.h:87)
1   com.apple.JavaScriptCore      	0x00000001015bd1fd bool JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::computeLocalLivenessForBytecodeOffset<JSC::BytecodeGraph<JSC::CodeBlock> >(JSC::BytecodeGraph<JSC::CodeBlock>&, JSC::BytecodeBasicBlock*, unsigned int, WTF::FastBitVector&) + 157 (BytecodeLivenessAnalysisInlines.h:137)
2   com.apple.JavaScriptCore      	0x00000001015be2a1 void JSC::BytecodeLivenessPropagation<JSC::BytecodeLivenessAnalysis>::runLivenessFixpoint<JSC::BytecodeGraph<JSC::CodeBlock> >(JSC::BytecodeGraph<JSC::CodeBlock>&) + 1265 (BytecodeLivenessAnalysisInlines.h:196)
3   com.apple.JavaScriptCore      	0x00000001015bd02c JSC::BytecodeLivenessAnalysis::BytecodeLivenessAnalysis(JSC::CodeBlock*) + 76 (BytecodeLivenessAnalysis.cpp:42)
4   com.apple.JavaScriptCore      	0x00000001015d8f06 JSC::CodeBlock::livenessAnalysisSlow() + 38 (CodeBlock.cpp:3080)
5   com.apple.JavaScriptCore      	0x0000000101713023 JSC::DFG::Graph::livenessFor(JSC::CodeBlock*) + 403 (CodeBlock.h:603)
6   com.apple.JavaScriptCore      	0x0000000101713445 JSC::DFG::Graph::isLiveInBytecode(JSC::VirtualRegister, JSC::CodeOrigin) + 277 (DFGGraph.cpp:1075)
7   com.apple.JavaScriptCore      	0x00000001017b71e2 JSC::DFG::performPhantomInsertion(JSC::DFG::Graph&) + 2770 (DFGForAllKills.h:60)
8   com.apple.JavaScriptCore      	0x00000001017bb7a9 JSC::DFG::Plan::compileInThreadImpl() + 8697 (DFGPlan.cpp:385)
9   com.apple.JavaScriptCore      	0x00000001017b8f49 JSC::DFG::Plan::compileInThread(JSC::DFG::ThreadData*) + 633 (DFGPlan.cpp:188)
10  com.apple.JavaScriptCore      	0x00000001018ab971 JSC::DFG::Worklist::ThreadBody::work() + 257 (DFGWorklist.cpp:112)
11  com.apple.JavaScriptCore      	0x0000000101e6e15e std::__1::__function::__func<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, std::__1::allocator<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0>, void ()>::operator()() + 302 (AutomaticThread.cpp:217)
12  com.apple.JavaScriptCore      	0x0000000101ea586f WTF::threadEntryPoint(void*) + 175 (Threading.cpp:100)
13  com.apple.JavaScriptCore      	0x0000000101ea5fb9 WTF::wtfThreadEntryPoint(void*) + 121 (ThreadingPthreads.cpp:214)
14  libsystem_pthread.dylib       	0x00007fff907ea93b _pthread_body + 180
15  libsystem_pthread.dylib       	0x00007fff907ea887 _pthread_start + 286
16  libsystem_pthread.dylib       	0x00007fff907ea08d thread_start + 13

[Radar WebKit Bug Importer]

<rdar://problem/32581512>

[Mark Lam]

According to https://build.webkit.org/builders/Apple%20High%20Sierra%20Release%20JSC%20%28Tests%29?numbuilds=200, this issue hasn't shown up even once in the last 200 test runs. Ryan also said that he hasn't seen this failure in a while.