On Ubuntu 16.04,
Using --optional=4ti2,atlas,ccache,meataxe,mpir,pandocfilters,python2,sage

make ptestlong finishes with:

sage -t --long --warn-long 42.7 src/sage/matrix/matrix_integer_dense.pyx
    Timed out (and interrupt failed)
**********************************************************************
Tests run before process (pid=1027) timed out:
sage: a = matrix(ZZ, 3,3, range(9)); a ## line 20 ##
[0 1 2]
[3 4 5]
[6 7 8]
sage: a.det() ## line 24 ##
0
sage: a[0,0] = 10; a.det() ## line 26 ##
-30
sage: a.charpoly() ## line 28 ##
x^3 - 22*x^2 + 102*x + 30
sage: b = -3*a ## line 30 ##
sage: a == b ## line 31 ##
False
sage: b < a ## line 33 ##
True
sage: a = matrix(ZZ,2,range(4), sparse=False) ## line 38 ##
sage: TestSuite(a).run() ## line 39 ##
sage: Matrix(ZZ,0,0).inverse() ## line 40 ##
[]
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 
43 ##
0

[...]

sage: a = matrix(ZZ,2,[1,-7,3,5]) ## line 5227 ##
sage: a._change_ring(RDF) ## line 5228 ##
[ 1.0 -7.0]
[ 3.0  5.0]
sage: sig_on_count() # check sig_on/off pairings (virtual doctest) ## line 
5231 ##
0
sage: A = random_matrix(ZZ,3,3) ## line 5251 ##
sage: As = singular(A); As ## line 5252 ##

**********************************************************************
----------------------------------------------------------------------
sage -t --long --warn-long 42.7 src/sage/matrix/matrix_integer_dense.pyx  # 
Timed out (and interrupt failed)
----------------------------------------------------------------------
Total time for all tests: 3169.0 seconds
    cpu time: 7171.9 seconds
    cumulative wall time: 8730.4 seconds
Makefile:112 : la recette pour la cible « ptestlong » a échouée
make: *** [ptestlong] Erreur 4

But runing tests again on the same file works:

Doctesting 1 file.
sage -t --long --warn-long 42.7 src/sage/matrix/matrix_integer_dense.pyx
    [573 tests, 11.63 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------

Sébastien

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