New submission from Tres Seaver:
A test of the 'persistent' package C extension segfaults under 3.3,
but completes successfully under 3.2. The C function being tested
is a wrapper around PyType_GenericNew:
static PyObject *
simple_new(PyObject *self, PyObject *type_object)
{
if (!PyType_Check(type_object))
{
PyErr_SetString(PyExc_TypeError,
"simple_new argument must be a type object.");
return NULL;
}
return PyType_GenericNew((PyTypeObject *)type_object, NULL, NULL);
}
The unit test which segfaults just iterates over basic types:
def test_w_type(self):
for typ in (type, list, dict, tuple, object):
self.assertTrue(isinstance(self._callFUT(typ), typ))
Some digging shows that the segfault comes while deallocating the
newly-made 'dict' object.
#0 dict_dealloc (mp=0x7ffff3f9d248) at Objects/dictobject.c:1392
#1 0x00000000004261cb in tupledealloc (op=0x7ffff3d90ab8)
at Objects/tupleobject.c:238
#2 0x000000000048065d in call_function (oparg=<optimized out>,
pp_stack=0x7fffffffa6e0) at Python/ceval.c:4064
#3 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>)
at Python/ceval.c:2679
#4 0x0000000000480b23 in fast_function (nk=<optimized out>, na=1,
n=<optimized out>, pp_stack=0x7fffffffa850, func=0x7ffff42284d0)
at Python/ceval.c:4150
#5 call_function (oparg=<optimized out>, pp_stack=0x7fffffffa850)
at Python/ceval.c:4083
----------
components: Extension Modules, Interpreter Core
messages: 177441
nosy: tseaver
priority: normal
severity: normal
status: open
title: Segfault under Python 3.3 after PyType_GenericNew
versions: Python 3.3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16676>
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