[Webkit-unassigned] [Bug 165064] New: ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js is failing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165064

            Bug ID: 165064
           Summary: ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-
                    newobj-invalidation.1.js is failing.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

The ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js test changes the prototype of a constructor function and expects new instances to inherit the new prototype.  However, it does not appear to succeed at doing this.

Some details:
1. The issue appears to be racy.  it's not easily reproducible on demand though it happens a lot on the bots, and I can reproduce it locally sometimes.
2. If I disable inlining and DFG compilation, I can't seem to reproduce it (assuming (1) above is not interfering).
3. If I disable the concurrent JIT, I can't seem to reproduce it (assuming (1) above is not interfering).
4. If I add options to dump disassembly, etc, I can't seem to reproduce it (assuming (1) above is not interfering).

The failing test output:

ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: DIFF FAILURE!
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: --- ../.tests/ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.baseline    2016-11-23 22:36:32.000000000 -0800
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +++ ../ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default.out    2016-11-23 23:34:34.000000000 -0800
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: @@ -2,12 +2,12 @@
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default:  oa1[0]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default:  oa1[1]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default:  oa1[2]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: -oa1[3]: { a: 0, b: 1, p: 200, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: -oa1[4]: { a: 0, b: 1, p: 200, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: -oa1[5]: { a: 0, b: 1, p: 200, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: -oa1[6]: { a: 0, b: 1, p: 200, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: -oa1[7]: { a: 0, b: 1, p: 200, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: -oa1[8]: { a: 0, b: 1, p: 200, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +oa1[3]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +oa1[4]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +oa1[5]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +oa1[6]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +oa1[7]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default: +oa1[8]: { a: 0, b: 1, p: 100, x: 10, y: 11 }
ChakraCore.yaml/ChakraCore/test/fieldopts/objtypespec-newobj-invalidation.1.js.default:

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