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Multiple assertion failures for Python classes derived from System.Exception in debug builds #1218

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Multiple assertion failures for Python classes derived from System.Exception in debug builds#1218
@lostmsu

Description

@lostmsu
lostmsu
opened on Sep 11, 2020

Environment

  • Pythonnet version: 2.5.1
  • Python version: 3.8
  • Operating System: Win 10 64

Details

In debug build (DebugWinPY3) this test:

pythonnet/src/tests/test_constructors.py

Line 41 in 61d1b7c

class Sub(System.Exception):

fails this assertion:

pythonnet/src/runtime/interop.cs

Line 92 in 61d1b7c

Debug.Assert(typeSize > 0 && typeSize <= ExceptionOffset.Size());

Python type object for Sub class gets an unknown extra field of size IntPtr.Size, causing it to be larger than its base type object (reflected) System.Exception.

See also #1196 (comment) for previous discussion.

@koubaa @amos402

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