#5443: [with patch, needs review] Segfault in congruence subgroup element code
---------------------------+------------------------------------------------
Reporter: craigcitro | Owner: craigcitro
Type: defect | Status: new
Priority: blocker | Milestone: sage-3.4
Component: modular forms | Keywords:
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Old description:
> David Loeffler ran into the following segfault earlier:
>
> {{{
> sage: r,s,t,u = Gamma0(2).gens()
> sage: r**(-1)*u**(-1) == t
> BOOM
> }}}
>
> The attached patch fixes this, and adds a doctest. There's more work to
> be done: `matrix_integer_2x2` should inherit from `matrix_integer_dense`,
> but it doesn't yet. I have 98% of the code to do it done, but it needs to
> get cleaned up and submitted.
>
> '''HOWEVER''': I don't have a copy of sage-3.3 on my machine, so the
> patch is against sage-3.2.3. I
New description:
David Loeffler ran into the following segfault earlier:
{{{
sage: r,s,t,u = Gamma0(2).gens()
sage: r**(-1)*u**(-1) == t
BOOM
}}}
The attached patch fixes this, and adds a doctest. There's more work to be
done: `matrix_integer_2x2` should inherit from `matrix_integer_dense`, but
it doesn't yet. I have 98% of the code to do it done, but it needs to get
cleaned up and submitted.
'''HOWEVER''': I don't have a copy of sage-3.3 on my machine, so the patch
is against sage-3.2.3. I can either clean this up myself if someone points
me to a build of `3.3.rc?` on sage.math, or someone else could do it ...
`:)`
--
Comment(by craigcitro):
(I apparently forgot to finish the description.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5443#comment:1>
Sage <http://sagemath.org/>
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