Infinite recursion crash

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Originally reported by: RMTEW FULL NAME (Bitbucket: rmtew, GitHub: rmtew)

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(originally reported in Trac by @akruis on 2013-04-23 13:04:22)

The following code leads to an infinite recursion.

stackless.enable_softswitch(True)

class A(object):
    def __call__(self): pass # work around issue #18
A.__call__ = A()             # OK
a=A()                        # OK
a()                          # Crash

This bounces between typeobject.c slot_tp_call() and PyObject_Call() without
ever hitting eval_frame().

The infinite recursion does not happen with CPython. The relevant difference is a change
in PyObject_Call() (http://svn.python.org/view?view=revision&revision=76528).

I'll commit a fix soon.

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• Bitbucket: https://bitbucket.org/stackless-dev/stackless/issue/17

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Original comment by RMTEW FULL NAME (Bitbucket: rmtew, GitHub: rmtew):

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@akruis on 2013-04-24 15:57:08 said:

Fixed by changeset [91ff56a0cd3c] in branch 2.7-slp.
I added a call to Py_EnterRecursiveCall/Py_EnterLeaveRecursiveCall to slot_tp_call().
The tp_call function for classic classes contains similar code.

To do: check if Python3 is also affected by this issue.

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Original comment by Anselm Kruis (Bitbucket: akruis, GitHub: akruis):

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Already resolved. Commit for 3.x is 5af459b8176c.