#7382: MonskyWashnitzer segfault
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Reporter: jen | Owner: robertwb
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: algebraic geometry | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by jdemeyer):
* component: number theory => algebraic geometry
* milestone: sage-6.4 => sage-6.5
Old description:
> So I don't actually *need* matrix_of_frobenius_hyperelliptic of a curve
> over an extension field, but I inadvertently passed it in during a
> computation and caused a segfault. It would be nice for this to work
> (coercion?), since the curve is defined over QQ anyway.
>
> {{{
> sage: R.<x> = QQ['x']
> sage: H = HyperellipticCurve(x^3-10*x+9)
> sage: K = Qp(3,5)
> sage: J.<a> = K.extension(x^30-3)
> sage: HJ = H.change_ring(J)
> sage: import sage.schemes.elliptic_curves.monsky_washnitzer as mw
> sage: M_frob, forms = mw.matrix_of_frobenius_hyperelliptic(HJ)
>
> ------------------------------------------------------------
> Unhandled SIGSEGV: A segmentation fault occured in SAGE.
> This probably occured because a *compiled* component
> of SAGE has a bug in it (typically accessing invalid memory)
> or is not properly wrapped with _sig_on, _sig_off.
> You might want to run SAGE under gdb with 'sage -gdb' to debug this.
> SAGE will now terminate (sorry).
> ------------------------------------------------------------
> }}}
New description:
So I don't actually *need* matrix_of_frobenius_hyperelliptic of a curve
over an extension field, but I inadvertently passed it in during a
computation and caused a segfault. It would be nice for this to work
(coercion?), since the curve is defined over QQ anyway.
{{{
sage: R.<x> = QQ['x']
sage: H = HyperellipticCurve(x^3-10*x+9)
sage: K = Qp(3,5)
sage: J.<a> = K.extension(x^30-3)
sage: HJ = H.change_ring(J)
sage: import sage.schemes.hyperelliptic_curves.monsky_washnitzer as mw
sage: M_frob, forms = mw.matrix_of_frobenius_hyperelliptic(HJ)
...SIGSEGV...
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/7382#comment:6>
Sage <http://www.sagemath.org>
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and MATLAB
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