[4.1RC2] test_timer failed on s390x #10847

__________________________________ test_timer __________________________________

    @pytest.mark.filterwarnings("ignore")
    def test_timer():
        """Test function timer."""
        from astropy.utils.timer import RunTimePredictor
        p = RunTimePredictor(func_to_time)
    
        # --- These must run before data points are introduced. ---
    
        with pytest.raises(ValueError):
            p.do_fit()
    
        with pytest.raises(RuntimeError):
            p.predict_time(100)
    
        # --- These must run next to set up data points. ---
    
        p.time_func([2.02, 2.04, 2.1, 'a', 2.3])
        p.time_func(2.2)  # Test OrderedDict
    
        assert p._funcname == 'func_to_time'
        assert p._cache_bad == ['a']
    
        k = list(p.results.keys())
        v = list(p.results.values())
        np.testing.assert_array_equal(k, [2.02, 2.04, 2.1, 2.3, 2.2])
        np.testing.assert_allclose(v, [0.1, 0.2, 0.5, 1.5, 1.0])
    
        # --- These should only run once baseline is established. ---
    
        with pytest.raises(ModelsError):
            a = p.do_fit(model='foo')
    
        with pytest.raises(ModelsError):
            a = p.do_fit(fitter='foo')
    
        a = p.do_fit()
    
        assert p._power == 1
    
        # Perfect slope is 5, with 10% uncertainty
>       assert 4.5 <= a[1] <= 5.5
E       assert 4.5 <= 3.2149869047170583

astropy/utils/tests/test_timer.py:75: AssertionError