[Numpy-discussion] PATCH: reference leaks for 'numpy.core._internal' module object

Lisandro Dalcin dalcinl@gmail....
Fri Jul 2 23:11:20 CDT 2010

The simple test below show the issue.

import sys
import numpy as np
from numpy.core import _internal

def f(a = np.zeros(4)):
    a = np.zeros(4)
    b = memoryview(a)
    c = np.asarray(b)
    print sys.getrefcount(_internal)

while 1:

The patch it trivial (I've added a little extra, unrelated NULL check):

Index: numpy/core/src/multiarray/buffer.c
--- numpy/core/src/multiarray/buffer.c	(revision 8468)
+++ numpy/core/src/multiarray/buffer.c	(working copy)
@@ -747,9 +747,13 @@
     str = PyUString_FromStringAndSize(buf, strlen(buf));
+    if (str == NULL) {
+        return NULL;
+    }
     descr = (PyArray_Descr*)PyObject_CallMethod(
         _numpy_internal, "_dtype_from_pep3118", "O", str);
+    Py_DECREF(_numpy_internal);
     if (descr == NULL) {
                      "'%s' is not a valid PEP 3118 buffer format string", buf);

PS: I think that such implementation should at least handle the very
simple one/two character format (eg, 'i', 'f', 'd', 'Zf', 'Zd', etc.)
without calling Python code... Of course, complaints without patches
should not be taken too seriously ;-)

Lisandro Dalcin
Predio CONICET-Santa Fe
Colectora RN 168 Km 472, Paraje El Pozo
Tel: +54-342-4511594 (ext 1011)
Tel/Fax: +54-342-4511169

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