Answering my own question: this was indeed a bug.
The fix is basically a 1-liner which is now up for review:
https://trac.sagemath.org/ticket/26958
S.
On Sunday, December 23, 2018 at 4:26:39 PM UTC+1, Salvatore Stella wrote:
>
> Dear All,
> I just came acreoss the following strange behavior:
>
> {{{
> sage: from sage.rings.polynomial.multi_polynomial_libsingular import
> MPolynomialRing_libsingular
>
> # This works as expected
> sage: MPolynomialRing_libsingular(QQ, 2, ['x','y'], 'degrevlex')
> Multivariate Polynomial Ring in x, y over Rational Field
>
> # But this crashes sage with a segmentation fault and core dump
> sage: class Test(MPolynomialRing_libsingular):
> ....: pass
> sage: Test(QQ, 2, ['x','y'], 'degrevlex')
>
> }}}
>
> At first I thought it might be something related to the fact that
> MPolynomialRing_libsingular is a cython class but this other example works
> as
> one would expect:
>
> {{{
> sage: from sage.rings.polynomial.pbori import BooleanPolynomialRing
>
> # As expected
> sage: BooleanPolynomialRing(2, ['x','y'], 'degrevlex')
> Boolean PolynomialRing in x, y
>
> # As expacted
> sage: class Test2(BooleanPolynomialRing):
> ....: pass
> sage: Test2(2, ['x','y'], 'degrevlex')
> Boolean PolynomialRing in x, y
>
> }}}
>
> Am I missing something?
> Thanks
> S.
>
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