[Numpy-discussion] segmentation fault

[Pauli Virtanen]

ke, 2008-05-28 kello 10:59 -0400, Scott Ransom kirjoitti:
> Hmmm.  Interesting.  I'm on a 64-bit Debian Unstable system with numpy 
> 1.0.4 and python 2.5.2 and I don't get this:
> 
> In [1]: import numpy as np
> 
> In [2]: np.__version__
> Out[2]: '1.0.4'
> 
> In [3]: def fn():
>    ...:     x = np.random.rand(5,2)
>    ...:     x.cumsum(None, out=x)
>    ...:     return x
>    ...:
> 
> In [4]: fn()
> Out[4]:
> array([[ 0.40329303,  0.45335328],
>        [ 0.85664631,  0.84798294],
>        [ 1.71329262,  0.05877989],
>        [ 2.56127556,  0.99401291],
>        [ 4.27456818,  0.79275409]])
> 
> Wonder if the 64-bit thing could be the difference?

Try running fn() again to make the bug bomb out:

$ python
Python 2.5.2 (r252:60911, Apr 21 2008, 11:12:42) 
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> imp
KeyboardInterrupt
>>> import numpy as np
>>> def fn():
...     x = np.random.rand(5,2)
...     x.cumsum(None, out=x)
...     return x
... 
>>> np.__version__
'1.0.5.dev5024'
>>> fn()
array([[ 0.59654253,  0.12577169],
       [ 0.72231422,  0.30600244],
       [ 1.44462843,  0.35849553],
       [ 1.75063088,  0.56925858],
       [ 3.19525931,  0.77487798]])
>>> fn()
*** glibc detected *** python: munmap_chunk(): invalid pointer:
0x08439d28 ***

-- 
Pauli Virtanen