Created attachment 492 [details]
Sample to demonstrate the problem

See the attached example for a demonstration of the problem.
I'll also attach the traceback I got from gdb.

Essentially what appears to happen is this:

1. PySide::MetaFunction::call converts the arguments to the signal to cpp
values
2. The shiboken converter to do that converts Py_None to a NULL-pointer
(pythonToCppPointer in libshiboken/sbkconvert.cpp)
3. The QMetaObject system tries to make a copy of the PyObject pointer using a
PySide::PyObjectWrapper which then goes boom when trying to INCREF its
underlying python object

I have attached a simple patch that uses Py_XINCREF/DECREF instead. With
this I no longer get a crash, but I don't know the pyside internals well
enough to know if this is a good solution or just masking the symptoms of the
real problem.



Versions used:

  apiextractor 0.10.10
  generatorrunner 0.6.16
  shiboken 1.1.0
  pyside 1.1.0