[Webkit-unassigned] [Bug 149744] New: REGRESSION: jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl crashes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149744

            Bug ID: 149744
           Summary: REGRESSION:
                    jsc-layout-tests.yaml/js/script-tests/dfg-dead-variabl
                    e-on-exit.js.layout-ftl crashes
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Critical
          Priority: P1
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ossy at webkit.org
                CC: fpizlo at apple.com, ggaren at apple.com,
                    mark.lam at apple.com, msaboff at apple.com

Nowadays jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl 
crashes regularly on the Apple Yosemite Debug JSC tester bot:

jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: This tests that if a variable is dead on OSR exit, it will at least contain a valid JS value.
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: Timed out after 339.000000 seconds!
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 1   0x104ceb300 WTFCrash
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 2   0x1040dae4e timeoutThreadMain(void*)
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 3   0x104d55559 WTF::createThread(void (*)(void*), void*, char const*)::$_0::operator()() const
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 4   0x104d5552c std::__1::__function::__func<WTF::createThread(void (*)(void*), void*, char const*)::$_0, std::__1::allocator<WTF::createThread(void (*)(void*), void*, char const*)::$_0>, void ()>::operator()()
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 5   0x104796b9a std::__1::function<void ()>::operator()() const
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 6   0x104d5437e WTF::threadEntryPoint(void*)
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 7   0x104d55af1 WTF::wtfThreadEntryPoint(void*)
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 8   0x7fff86dee05a _pthread_body
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 9   0x7fff86dedfd7 _pthread_body
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: 10  0x7fff86deb3ed thread_start
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: test_script_22809: line 2: 58336 Segmentation fault: 11  "$@" ../../../../.vm/JavaScriptCore.framework/Resources/jsc --useFTLJIT\=false --enableFunctionDotArguments\=true --testTheFTL\=true --useFTLJIT\=true --ftlCrashesIfCantInitializeLLVM\=true resources/standalone-pre.js dfg-dead-variable-on-exit.js resources/standalone-post.js
jsc-layout-tests.yaml/js/script-tests/dfg-dead-variable-on-exit.js.layout-ftl: ERROR: Unexpected exit code: 139

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