[Numpy-discussion] dot and deallocation bug?
Zachary Pincus
zpincus at stanford.edu
Mon Mar 13 17:28:07 CST 2006
Hi folks,
I've run across an odd error in my numpy install related to numpy.dot
with python lists of floats.
Now, I haven't updated from svn in a while (I'm currently using numpy
to do some data analysis, so I'm not changing things until that's
done). Perhaps someone could confirm whether this is still a bug in
the current version?
Here's how I reproduce the error (OS X 10.4.5), python 2.4.2:
In [1]: import numpy
In [2]: numpy.version.version
Out[2]: '0.9.6.2208'
In [3]: numpy.dot([0.0, 1.0], [1, 2, 3])
ValueError: matrices are not aligned
In [4]: numpy.dot([0.0, 1.0], [1, 2, 3])
ValueError: matrices are not aligned
In [5]: numpy.dot([0.0, 1.0], [1, 2, 3])
Python(5957) malloc: *** Deallocation of a pointer not malloced:
0x1188bec; This could be a double free(), or free() called with the
middle of an allocated block; Try setting environment variable
MallocHelp to see tools to help debug
ValueError: matrices are not aligned
In [6]: numpy.dot([0.0, 1.0], [1, 2, 3])
Python(5957) malloc: *** Deallocation of a pointer not malloced:
0x1188bec; This could be a double free(), or free() called with the
middle of an allocated block; Try setting environment variable
MallocHelp to see tools to help debug
Python(5957) malloc: *** Deallocation of a pointer not malloced:
0x1188bec; This could be a double free(), or free() called with the
middle of an allocated block; Try setting environment variable
MallocHelp to see tools to help debug
Python(5957) malloc: *** Deallocation of a pointer not malloced:
0x1188bec; This could be a double free(), or free() called with the
middle of an allocated block; Try setting environment variable
MallocHelp to see tools to help debug
ValueError: matrices are not aligned
Always the third time after I do this incorrect dot operation, the
malloc errors start appearing. The more times I do the operation, the
longer the list of malloc errors gets. If the input lists are not
floating-point, this doesn't happen (also the ValueError states:
'objects are not aligned' instead of 'matrices are not aligned').
Any thoughts?
Zach Pincus
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