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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ASSERION failure: !masqueradesAsUndefinedWatchpointIsStillValid() || !isKnownCell(operand.node())"
href="https://bugs.webkit.org/show_bug.cgi?id=168587">168587</a>
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<tr>
<th>Summary</th>
<td>ASSERION failure: !masqueradesAsUndefinedWatchpointIsStillValid() || !isKnownCell(operand.node())
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
<tr>
<th>Version</th>
<td>WebKit Local Build
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Unspecified
</td>
</tr>
<tr>
<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mark.lam@apple.com
</td>
</tr></table>
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<pre>When running the JSC tests with a debug build (WebKit trunk r212625 in my case), we sometimes get this failure:
stress/test-finally.js.ftl-eager: ASSERTION FAILED: The Compare should have been eliminated, it is known to be always false.
stress/test-finally.js.ftl-eager: !masqueradesAsUndefinedWatchpointIsStillValid() || !isKnownCell(operand.node())
stress/test-finally.js.ftl-eager: /Volumes/Data/ws3/OpenSource/Source/JavaScriptCore/dfg/DFGSpeculativeJIT64.cpp(222) : void JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeCompareNullOrUndefined(JSC::DFG::Edge)
stress/test-finally.js.ftl-eager: 1 0x108aec19d WTFCrash
stress/test-finally.js.ftl-eager: 2 0x108161af9 JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeCompareNullOrUndefined(JSC::DFG::Edge)
stress/test-finally.js.ftl-eager: 3 0x1080fdbdb JSC::DFG::SpeculativeJIT::compare(JSC::DFG::Node*, JSC::MacroAssemblerX86Common::RelationalCondition, JSC::MacroAssemblerX86Common::DoubleCondition, unsigned long (*)(JSC::ExecState*, long long, long long))
stress/test-finally.js.ftl-eager: 4 0x108171617 JSC::DFG::SpeculativeJIT::compile(JSC::DFG::Node*)
stress/test-finally.js.ftl-eager: 5 0x1080e30af JSC::DFG::SpeculativeJIT::compileCurrentBlock()
stress/test-finally.js.ftl-eager: 6 0x1080e3c43 JSC::DFG::SpeculativeJIT::compile()
stress/test-finally.js.ftl-eager: 7 0x107fa27e7 JSC::DFG::JITCompiler::compileBody()
stress/test-finally.js.ftl-eager: 8 0x107fa78a3 JSC::DFG::JITCompiler::compileFunction()
stress/test-finally.js.ftl-eager: 9 0x108094b4e JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&)
stress/test-finally.js.ftl-eager: 10 0x108091e49 JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*)
stress/test-finally.js.ftl-eager: 11 0x108207325 JSC::DFG::Worklist::ThreadBody::work()
stress/test-finally.js.ftl-eager: 12 0x108afa25d WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0::operator()() const
stress/test-finally.js.ftl-eager: 13 0x108afa01d void std::__1::__invoke_void_return_wrapper<void>::__call<WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0&>(WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0&&&)
stress/test-finally.js.ftl-eager: 14 0x108af9db9 std::__1::__function::__func<WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0, std::__1::allocator<WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0>, void ()>::operator()()
stress/test-finally.js.ftl-eager: 15 0x1080d9e5a std::__1::function<void ()>::operator()() const
stress/test-finally.js.ftl-eager: 16 0x108b5c4a7 WTF::threadEntryPoint(void*)
stress/test-finally.js.ftl-eager: 17 0x108b5e081 WTF::wtfThreadEntryPoint(void*)
stress/test-finally.js.ftl-eager: 18 0x7fffd076eaab _pthread_body
stress/test-finally.js.ftl-eager: 19 0x7fffd076e9f7 _pthread_body
stress/test-finally.js.ftl-eager: 20 0x7fffd076e1fd thread_start
stress/test-finally.js.ftl-eager: test_script_16641: line 2: 42646 Segmentation fault: 11 ( "$@" ../../.vm/JavaScriptCore.framework/Resources/jsc --useFTLJIT\=false --useFunctionDotArguments\=true --maxPerThreadStackUsage\=1572864 --useFTLJIT\=true --thresholdForJITAfterWarmUp\=10 --thresholdForJITSoon\=10 --thresholdForOptimizeAfterWarmUp\=20 --thresholdForOptimizeAfterLongWarmUp\=20 --thresholdForOptimizeSoon\=20 --thresholdForFTLOptimizeAfterWarmUp\=20 --thresholdForFTLOptimizeSoon\=20 --maximumEvalCacheableSourceLength\=150000 --useEagerCodeBlockJettisonTiming\=true test-finally.js )
stress/test-finally.js.ftl-eager: ERROR: Unexpected exit code: 139</pre>
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