Smells like https://trac.sagemath.org/ticket/23742

> On 10/11/2017, at 11:31, John H Palmieri <[email protected]> wrote:
> 
> WIth OS X 10.12.6, Xcode (and the same happens when building with clang, 
> #12426):
> 
> sage -t --long --warn-long 64.0 src/sage/matrix/matrix_mod2_dense.pyx  # 
> Killed due to kill signal
> 
> **********************************************************************
> Tests run before process (pid=12556) failed:
> sage: a = matrix(GF(2),3,range(9),sparse=False); a ## line 8 ##
> [0 1 0]
> [1 0 1]
> [0 1 0]
> sage: a.rank() ## line 12 ##
> 2
> sage: type(a) ## line 14 ##
> <type 'sage.matrix.matrix_mod2_dense.Matrix_mod2_dense'>
> sage: a[0,0] = 1 ## line 16 ##
> sage: a.rank() ## line 17 ##
> 3
> sage: parent(a) ## line 19 ##
> Full MatrixSpace of 3 by 3 dense matrices over Finite Field of size 2
> sage: a^2 ## line 22 ##
> [0 1 1]
> [1 0 0]
> [1 0 1]
> sage: a+a ## line 26 ##
> [0 0 0]
> [0 0 0]
> [0 0 0]
> sage: b = a.new_matrix(2,3,range(6)); b ## line 31 ##
> [0 1 0]
> [1 0 1]
> sage: a*b ## line 35 ##
> sage: b*a ## line 39 ##
> [1 0 1]
> [1 0 0]
> sage: TestSuite(a).run() ## line 43 ##
> sage: TestSuite(b).run() ## line 44 ##
> sage: a.echelonize(); a ## line 46 ##
> [1 0 0]
> [0 1 0]
> [0 0 1]
> sage: b.echelonize(); b ## line 50 ##
> [1 0 1]
> [0 1 0]
> sage: FF = FiniteField(2) ## line 56 ##
> sage: V = VectorSpace(FF,2) ## line 57 ##
> sage: v = V([0,1]); v ## line 58 ##
> (0, 1)
> sage: W = V.subspace([v]) ## line 60 ##
> sage: W ## line 61 ##
> Vector space of degree 2 and dimension 1 over Finite Field of size 2
> Basis matrix:
> [0 1]
> sage: v in W ## line 65 ##
> True
> sage: M = Matrix(GF(2), [[1,1,0],[0,1,0]]) ## line 68 ##
> sage: M.row_space() ## line 69 ##
> Vector space of degree 3 and dimension 2 over Finite Field of size 2
> Basis matrix:
> [1 0 0]
> [0 1 0]
> sage: M = Matrix(GF(2), [[1,1,0],[0,0,1]]) ## line 75 ##
> sage: M.row_space() ## line 76 ##
> Vector space of degree 3 and dimension 2 over Finite Field of size 2
> Basis matrix:
> [1 1 0]
> [0 0 1]
> sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 90 
> ##
> 0
> sage: type(random_matrix(GF(2),2,2)) ## line 165 ##
> <type 'sage.matrix.matrix_mod2_dense.Matrix_mod2_dense'>
> sage: Matrix(GF(2),3,3,1) # indirect doctest ## line 168 ##
> [1 0 0]
> [0 1 0]
> [0 0 1]
> sage: matrix(GF(2),0,[]) * vector(GF(2),0,[]) ## line 177 ##
> ()
> sage: MatrixSpace(GF(2), 2^30)(1) ## line 182 ##

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