Got sigsegv calculating rank of 80 x 79 dense matrix over Rational Field.

  File "matrix_rational_dense.pyx", line 2353, in 
sage.matrix.matrix_rational_dense.Matrix_rational_dense.rank 
(sage/matrix/matrix_rational_dense.c:22283)
  File "matrix_integer_dense.pyx", line 3216, in 
sage.matrix.matrix_integer_dense.Matrix_integer_dense.rank 
(sage/matrix/matrix_integer_dense.c:25776)
  File "matrix_integer_dense.pyx", line 3238, in 
sage.matrix.matrix_integer_dense.Matrix_integer_dense._rank_modp 
(sage/matrix/matrix_integer_dense.c:26097)
  File "matrix_modn_dense_template.pxi", line 2257, in 
sage.matrix.matrix_modn_dense_double.Matrix_modn_dense_template.rank 
(sage/matrix/matrix_modn_dense_double.cpp:12948)
  File "matrix_modn_dense_template.pxi", line 244, in 
sage.matrix.matrix_modn_dense_double.linbox_rank 
(sage/matrix/matrix_modn_dense_double.cpp:4446)
RuntimeError: Segmentation fault


System: debian x64 testing/unstable
CPU: 2.4 GHz Intel E6600 (2 cores), 2GB RAM, 64GB swap
Version: 'Sage Version 5.8, Release Date: 2013-03-15' from binary

Sorry, don't know how to put save file m.sobj here, cannot paste the whole 
matrix itself from m.str() here, so posting link to logfile:
  http://yadi.sk/d/1igWnkOr3zBiS

To reproduce bug, after creating matrix m, call m.rank()



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