[Numpy-discussion] segfault with min() method on fortran-strided arrays.

Zachary Pincus zpincus at stanford.edu
Tue Mar 28 19:06:05 CST 2006


Already fixed in svn -- thanks Travis.

Zach


On Mar 28, 2006, at 6:43 PM, Zachary Pincus wrote:

> Hi,
>
> I found a segfault in numpy that seems to have to do with the new  
> 'order' stuff. Steps to reproduce and gdb backtrace below. This is  
> new since numpy 0.9.7.2262, which is what I updated from today.
>
> Zach
>
>
> In [1]: import numpy
> In [2]: a = numpy.array([[1,2],[3,4],[5,6]])
> In [3]: b = numpy.transpose(a)
> In [4]: a.min()
> Out[4]: 1
> In [5]: b.min()
>
> Program received signal EXC_BAD_ACCESS, Could not access memory.
> Reason: KERN_PROTECTION_FAILURE at address: 0x0000000c
> _check_axis (arr=0x76696577, axis=0xbfffeb0c, flags=0) at numpy/ 
> core/src/arrayobject.c:3505
> 3505                    *axis = PyArray_NDIM(temp)-1;
> (gdb) backtrace
> #0  _check_axis (arr=0x76696577, axis=0xbfffeb0c, flags=0) at numpy/ 
> core/src/arrayobject.c:3505
> #1  0x01170594 in array_min (self=0x6776b0, args=0x139eba0,  
> kwds=0x0) at numpy/core/src/multiarraymodule.c:2909
> #2  0x0028b984 in PyEval_EvalFrame (f=0x1868c10) at Python/ceval.c: 
> 3558
> [...python stack frames snipped...]
> (gdb) info locals
> newdim = {
>   ptr = 0xbfffeaa8,
>   len = 1
> }
> val = {-1}
> temp = (PyObject *) 0x6776b0
> n = 2
> (gdb) info args
> arr = (PyArrayObject *) 0x76696577
> axis = (int *) 0xbfffeb0c
> flags = 0
>
>
>
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