[Webkit-unassigned] [Bug 149965] New: REGRESSION: ASSERT (impl->isAtomic()) @ facebook.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149965

            Bug ID: 149965
           Summary: REGRESSION: ASSERT (impl->isAtomic()) @ facebook.com
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ggaren at apple.com

STEPS TO REPRODUCE:
1. Create a debug build
2. Visit Facebook.com
3. Wait about 5 seconds

ASSERTION FAILED: impl->isAtomic()
/Volumes/Big/ggaren/OpenSource/Source/JavaScriptCore/dfg/DFGConstantFoldingPhase.cpp(261) : bool JSC::DFG::ConstantFoldingPhase::foldConstants(JSC::DFG::BasicBlock *)
1   0x114645330 WTFCrash
2   0x113d2b395 JSC::DFG::ConstantFoldingPhase::foldConstants(JSC::DFG::BasicBlock*)
3   0x113d2a39a JSC::DFG::ConstantFoldingPhase::run()
4   0x113d2a215 bool JSC::DFG::runAndLog<JSC::DFG::ConstantFoldingPhase>(JSC::DFG::ConstantFoldingPhase&)
5   0x113d2a19e bool JSC::DFG::runPhase<JSC::DFG::ConstantFoldingPhase>(JSC::DFG::Graph&)
6   0x113d2a158 JSC::DFG::performConstantFolding(JSC::DFG::Graph&)
7   0x113ea1bd1 JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&)
8   0x113ea0cda JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*)
9   0x113fa60d0 JSC::DFG::Worklist::runThread(JSC::DFG::ThreadData*)
10  0x113fa45c4 JSC::DFG::Worklist::threadFunction(void*)
11  0x1146b0419 WTF::createThread(void (*)(void*), void*, char const*)::$_0::operator()() const
12  0x1146b03ec std::__1::__function::__func<WTF::createThread(void (*)(void*), void*, char const*)::$_0, std::__1::allocator<WTF::createThread(void (*)(void*), void*, char const*)::$_0>, void ()>::operator()()
13  0x1140d91da std::__1::function<void ()>::operator()() const
14  0x1146af36e WTF::threadEntryPoint(void*)
15  0x1146b0cf8 WTF::wtfThreadEntryPoint(void*)
16  0x7fff8e3ba268 _pthread_body
17  0x7fff8e3ba1e5 _pthread_body
18  0x7fff8e3b841d thread_start

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