[Webkit-unassigned] [Bug 165674] New: REGRESSION (r209558-209572): Unresolved visit race assertions on stress/materialize-past-butterfly-allocation.js

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165674

            Bug ID: 165674
           Summary: REGRESSION (r209558-209572): Unresolved visit race
                    assertions on
                    stress/materialize-past-butterfly-allocation.js
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Regression
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: fpizlo at apple.com, ryanhaddad at apple.com

On debug JSC bots.

stress/materialize-past-butterfly-allocation.js.ftl-eager-no-cjit
stress/materialize-past-butterfly-allocation.js.ftl-no-cjit-no-inline-validate
stress/materialize-past-butterfly-allocation.js.ftl-no-cjit-no-put-stack-validate

Unresolved visit races: 0x10c647fe0(JSObject::visitButterfly)
SHOULD NEVER BE REACHED
/Volumes/Data/slave/yosemite-debug/build/Source/JavaScriptCore/heap/Heap.cpp(933) : void JSC::Heap::endMarking()
1   0x105c0f9a0 WTFCrash
2   0x1053c0851 JSC::Heap::endMarking()
3   0x1053bfe4f JSC::Heap::markToFixpoint(double)
4   0x1053c2c45 JSC::Heap::collectInThread()
5   0x1053cda59 JSC::Heap::Thread::work()
6   0x105c74a13 WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0::operator()() const
7   0x105c747bd void std::__1::__invoke_void_return_wrapper<void>::__call<WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0&>(WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0&&&)
8   0x105c745ac std::__1::__function::__func<WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0, std::__1::allocator<WTF::AutomaticThread::start(WTF::Locker<WTF::LockBase> const&)::$_0>, void ()>::operator()()
9   0x105159f9a std::__1::function<void ()>::operator()() const
10  0x105c86fbe WTF::threadEntryPoint(void*)
11  0x105c88a61 WTF::wtfThreadEntryPoint(void*)
12  0x7fff8bd9805a _pthread_body
13  0x7fff8bd97fd7 _pthread_body
14  0x7fff8bd953ed thread_start

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