New submission from Christoph Gohlke:
Using 64 bit CPython 2.6.6, 2.7.5, 3.2.5 or 3.3.2, numpy 1.7.1 and matplotlib
1.3.0 on Windows 8 64 bit, the following script segfaults most of the times:
```
# allocate ~4GB fragmented data
import numpy
a = [numpy.zeros(2**i, 'uint8') for i in range(1, 31)]
b = [numpy.zeros(131072, 'float64') for i in range(2048)]
# plot using TkAgg
import matplotlib
matplotlib.use('TkAgg')
from matplotlib import pyplot
pyplot.plot()
pyplot.show()
```
```
Fatal Python error: Segmentation fault
Current thread 0x00036c5c:
File "X:\Python33\lib\site-packages\matplotlib\backends\tkagg.py", line 17 in
blit
File "X:\Python33\lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 349 in draw
File "X:\Python33\lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 276 in resize
File "X:\Python33\lib\tkinter\__init__.py", line 1475 in __call__
File "X:\Python33\lib\tkinter\__init__.py", line 965 in update
File "X:\Python33\lib\site-packages\matplotlib\backends\backend_tkagg.py",
line 574 in show
File "X:\Python33\lib\site-packages\matplotlib\backend_bases.py", line 87 in
__call__
File "X:\Python33\lib\site-packages\matplotlib\pyplot.py", line 145 in show
File "tk_crash_win-amd64.py", line 14 in <module>
```
The pointer returned by Python's _tkinter.tkapp.interpaddr() is often wrong
because the 64 bit pointer is cast to 32 bit long and returned as PyInt.
Instead, the pointer should be cast to Py_ssize_t and returned as PyLong on
win-amd64.
The following patches for win-amd64-py2.7.5 and win-amd64-py3.3.2 fix the issue:
```
--- a/Modules/_tkinter.c Sun Sep 01 19:06:35 2013 -0400
+++ b/Modules/_tkinter.c Mon Sep 02 17:44:53 2013 -0700
@@ -2814,7 +2814,7 @@
if (!PyArg_ParseTuple(args, ":interpaddr"))
return NULL;
- return PyInt_FromLong((long)Tkapp_Interp(self));
+ return PyInt_FromSsize_t((Py_ssize_t)Tkapp_Interp(self));
}
```
```
--- a/Modules/_tkinter.c Sun Sep 01 19:03:41 2013 -0400
+++ b/Modules/_tkinter.c Mon Sep 02 17:44:02 2013 -0700
@@ -2688,7 +2688,7 @@
if (!PyArg_ParseTuple(args, ":interpaddr"))
return NULL;
- return PyLong_FromLong((long)Tkapp_Interp(self));
+ return PyLong_FromSsize_t((Py_ssize_t)Tkapp_Interp(self));
}
```
Updated _tkinter.pyd files are available at
<http://www.lfd.uci.edu/~cgohlke/pythonlibs/#_tkinter>.
----------
messages: 196819
nosy: cgohlke
priority: normal
severity: normal
status: open
title: Segfaults on win-amd64 due to corrupt pointer to Tkapp_Interp
type: crash
versions: Python 2.6, Python 2.7, Python 3.2, Python 3.3
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18909>
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