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Yes, Armin, that is a rather evil piece of code.  =)  But I
have a possible simple solution.  =)

If you add a check after the PyExceptionClass_Check() in the
'if' statement that tstate->recursion_depth is greater than
0, you short-circuit the infinite recursion and still get a
sensible output.

I have attached a patch with my proposed changes for
PyObject_Call() and PyErr_NormalizeException() and the
remove of the recursion check for slot_tp_call().  The only
issue I can see with this is if the recursion_depth check
turns out to be too small of a number.  But I really doubt
that will be an issue since one shouldn't be having a depth
of tracebacks greater than the current recursion depth.

Let me know what you think of the patch.