TST: xfail `TestCond.test_nan` unconditionally

This is happening on too many build configurations, and it's not
completely clear if it's just an OpenBLAS version or also depends
on something else. Reported as happening mostly on macOS, but
also on Fedora.

1 files changed, 6 insertions, 3 deletions

diff --git a/numpy/linalg/tests/test_linalg.py b/numpy/linalg/tests/test_linalg.py
index 8a270f194..c6e8cdd03 100644
--- a/numpy/linalg/tests/test_linalg.py
+++ b/numpy/linalg/tests/test_linalg.py
@@ -684,7 +684,7 @@ class SVDHermitianCases(HermitianTestCase, HermitianGeneralizedTestCase):
             axes = list(range(mat.ndim))
             axes[-1], axes[-2] = axes[-2], axes[-1]
             return np.conj(np.transpose(mat, axes=axes))
-        
+
         assert_almost_equal(np.matmul(u, hermitian(u)), np.broadcast_to(np.eye(u.shape[-1]), u.shape))
         assert_almost_equal(np.matmul(vt, hermitian(vt)), np.broadcast_to(np.eye(vt.shape[-1]), vt.shape))
         assert_equal(np.sort(s)[..., ::-1], s)
@@ -766,6 +766,9 @@ class TestCond(CondCases):
         for A, p in itertools.product(As, p_neg):
             linalg.cond(A, p)
 
+    @pytest.mark.xfail(True, run=False,
+                       reason="Platform/LAPACK-dependent failure, "
+                              "see gh-18914")
     def test_nan(self):
         # nans should be passed through, not converted to infs
         ps = [None, 1, -1, 2, -2, 'fro']
@@ -981,7 +984,7 @@ class TestLstsq(LstsqCases):
             linalg.lstsq(A, y, rcond=None)
 
 
-@pytest.mark.parametrize('dt', [np.dtype(c) for c in '?bBhHiIqQefdgFDGO']) 
+@pytest.mark.parametrize('dt', [np.dtype(c) for c in '?bBhHiIqQefdgFDGO'])
 class TestMatrixPower:
 
     rshft_0 = np.eye(4)
@@ -1010,7 +1013,7 @@ class TestMatrixPower:
             mz = matrix_power(M, 0)
             assert_equal(mz, identity_like_generalized(M))
             assert_equal(mz.dtype, M.dtype)
-        
+
         for mat in self.rshft_all:
             tz(mat.astype(dt))
             if dt != object: