#11403: Segfault while inverting q-adic number with fixed modulus precision
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Reporter: jdemeyer | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.1
Component: packages | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Description changed by jdemeyer:
Old description:
> {{{
> sage: R.<t> = Zq(8,2,'fixed-mod')
> sage: 1/(t+t^2)
> ...
> Unhandled SIGABRT: An abort() occurred in Sage.
> }}}
New description:
{{{
sage: R.<t> = Zq(8,2,'fixed-mod')
sage: 1/(t+t^2)
...
Unhandled SIGABRT: An abort() occurred in Sage.
}}}
Note that {{{t + t^2}}} is invertible:
{{{
sage: R.<t> = Zq(8,2,'fixed-mod')
sage: u = (t+1) + 2*t^2; u
(t + 1) + t^2*2 + O(2^2)
sage: u * (t + t^2)
1 + O(2^2)
}}}
There seem to be two issues:
* There is a missing {{{sig_on()}}}/{{{sig_off()}}}.
* NTL does not want to invert the invertible `t + t^2`.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11403#comment:1>
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