Sorry, it is really 81 by 80,  quite strange. But it still segfaults at 
m.rank().
md5: a9619508e02588d23290d63ae6f3ca44 mi.sobj

What is your sage version, OS (with bits) and computer?
In that file matrix_modn_dense_double.cpp some cython magic is being done, 
I am not sure how to debug it.

On Friday, April 12, 2013 12:52:03 AM UTC+4, Volker Braun wrote:
>
> Good catch, but the example that Sure posted is 81x80:
>
> sage: m
> 81 x 80 dense matrix over Rational Field (type 'print m.str()' to see all 
> of the entries)
>
>
> On Thursday, April 11, 2013 9:48:50 PM UTC+1, Jeroen Demeyer wrote:
>>
>> A 80 x 79 matrix of rank 80? 
>>
>

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