Flaky doctests

[tobiasdiez]

Some doctests fail from time to time (but usually not):

• ECL test sometimes fails to create maxima directory #26968, e.g. https://github.com/sagemath/sage/actions/runs/4258224254/jobs/7409227746

File "doc/ca/intro/index.rst", line 492, in doc.ca.intro.index
Failed example:
    solve([x + y == 6, x - y == 4], x, y)
Exception raised:
    Traceback (most recent call last):
      File "/__w/sage/sage/src/sage/doctest/forker.py", line 695, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/__w/sage/sage/src/sage/doctest/forker.py", line 1093, in compile_and_execute
        exec(compiled, globs)
      File "<doctest doc.ca.intro.index[1]>", line 1, in <module>
        solve([x + y == Integer(6), x - y == Integer(4)], x, y)
      File "/__w/sage/sage/src/sage/symbolic/relation.py", line 1137, in solve
        m = maxima(f)
      File "sage/misc/lazy_import.pyx", line 404, in sage.misc.lazy_import.LazyImport.__call__
        return self.get_object()(*args, **kwds)
      File "sage/misc/lazy_import.pyx", line 225, in sage.misc.lazy_import.LazyImport.get_object
        return self._get_object()
      File "sage/misc/lazy_import.pyx", line 261, in sage.misc.lazy_import.LazyImport._get_object
        self._object = getattr(__import__(self._module, {}, {}, [self._name]), self._name)
      File "/__w/sage/sage/src/sage/interfaces/maxima_lib.py", line 119, in <module>
        ecl_eval("(set-pathnames)")
      File "sage/libs/ecl.pyx", line 1350, in sage.libs.ecl.ecl_eval
        cpdef EclObject ecl_eval(str s):
      File "sage/libs/ecl.pyx", line 1373, in sage.libs.ecl.ecl_eval
        o=ecl_safe_eval(python_to_ecl(s, True))
      File "sage/libs/ecl.pyx", line 321, in sage.libs.ecl.ecl_safe_eval
        raise RuntimeError("ECL says: {}".format(message))
    RuntimeError: ECL says: Could not create directory "/github/home/.sage/maxima"
    C library error: "File exists"

• https://github.com/sagemath/sage/actions/runs/4258224840/jobs/7409228901

File "sage/rings/polynomial/polynomial_quotient_ring_element.py", line 719, in sage.rings.polynomial.polynomial_quotient_ring_element.PolynomialQuotientRingElement.minpoly
Failed example:
    L.<v> = K.extension(randrange(2,20))
Exception raised:
    Traceback (most recent call last):
      File "/__w/sage/sage/src/sage/doctest/forker.py", line 695, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/__w/sage/sage/src/sage/doctest/forker.py", line 1093, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.rings.polynomial.polynomial_quotient_ring_element.PolynomialQuotientRingElement.minpoly[11]>", line 1, in <module>
        L = K.extension(randrange(Integer(2),Integer(20)), names=('v',)); (v,) = L._first_ngens(1)
      File "sage/rings/finite_rings/finite_field_base.pyx", line 1541, in sage.rings.finite_rings.finite_field_base.FiniteField.extension
        E = GF((self.characteristic(), self.degree() * modulus), name=name, **kwds)
      File "sage/structure/factory.pyx", line 371, in sage.structure.factory.UniqueFactory.__call__
        return self.get_object(version, key, kwds)
      File "sage/structure/factory.pyx", line 415, in sage.structure.factory.UniqueFactory.get_object
        obj = self.create_object(version, key, **extra_args)
      File "/__w/sage/sage/src/sage/rings/finite_rings/finite_field_constructor.py", line 754, in create_object
        raise ValueError("finite field modulus must be irreducible but it is not")
    ValueError: finite field modulus must be irreducible but it is not

• https://github.com/sagemath/sage/actions/runs/4258330762/jobs/7409453829, https://github.com/sagemath/sage/actions/runs/4217702624/jobs/7321717919

File "sage/schemes/elliptic_curves/ell_field.py", line 1345, in sage.schemes.elliptic_curves.ell_field.EllipticCurve_field.isogenies_prime_degree
Failed example:
    E.isogenies_prime_degree(max_l=3)
Exception raised:
    Traceback (most recent call last):
      File "sage/structure/category_object.pyx", line 839, in sage.structure.category_object.CategoryObject.getattr_from_category
        return self.__cached_methods[name]
    KeyError: 'point_homset'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "/__w/sage/sage/src/sage/schemes/projective/projective_subscheme.py", line 122, in point
        return self._point(self.point_homset(), v, check=check)
      File "/__w/sage/sage/src/sage/schemes/elliptic_curves/ell_point.py", line 256, in __init__
        point_homset = curve.point_homset()
      File "sage/structure/category_object.pyx", line 833, in sage.structure.category_object.CategoryObject.__getattr__
        return self.getattr_from_category(name)
      File "sage/structure/category_object.pyx", line 848, in sage.structure.category_object.CategoryObject.getattr_from_category
        attr = getattr_from_other_class(self, cls, name)
      File "sage/cpython/getattr.pyx", line 356, in sage.cpython.getattr.getattr_from_other_class
        raise AttributeError(dummy_error_message)
    AttributeError: 'sage.rings.polynomial.polynomial_zz_pex.Polynomial_ZZ_pEX' object has no attribute '__custom_name'

[ashutosh887]

I would like to work on this @tobiasdiez

[tobiasdiez]

Nice! The first issue has already a PR, but the last two ones are still up for grabs.

[ashutosh887]

Which two ones @tobiasdiez Sir?
Please let me know. Thanks

[tobiasdiez]

The last two errors/failing tests in the above list.