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Asked: 2026-05-25T10:22:46+00:00

I have a C++ library which uses Python callbacks. The callback, i.e. PyObject*, is

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I have a C++ library which uses Python callbacks. The callback, i.e. PyObject*, is stored in an object of class UnaryFunction, and the constructor Py_INCREFs it. The destuctor Py_XDECREFs it. That’s the problem. The interpreter segfaults on that DECREF.

My solution is to just not DECREF it, but that seems wrong.
What is the proper way to INC/DEC the reference count of a function, and more importantly, why does the interpreter try to GC a function body when there are other live references to it?

Edit: On Linux instead of a segfault I get an assertion fail that says:

python: Objects/funcobject.c:442: func_dealloc: Assertion 'g->gc.gc_refs != (-2)' failed.

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1 Answer

  1. Editorial Team

    It appears the Py_INCREF simply doesn’t actually increment the refcount.

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