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Crash on scripting_object_get_class because Mono does not throw correct exception



How to reproduce:
1. Open the attached project
2. Open the "SampleScene.Unity" scene
3. Press Play

Actual result: Unity crashes.

Reproducible with: 2019.1.0a5, 2018.3.0b6, 2018.2.13f1, 2018.1.9f2, 2017.4.13f1, 2017.2.4f1.

The crash is caused by lines 29 and 30 (both have to be executed to reproduce the crash) in Crashy.cs

  1. Response avatar

    Resolution Note:

    We should raise an exception rather than crash when reference and valuetype fields overlap. However, detecting this in mono has proven more difficult than expected. I am resolving this for now as this crash only occurs in a low likelihood event, where a user has explicitly overlapped reference and valuetype fields via Explicit layout.

    // Avoid code like the following

    public struct GCCrasher
    [FieldOffset(0)] public int valueType;
    [FieldOffset(0)] public GameObject referenceType;

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