#9880: Segfault in PyNaC 0.2.0.p4
-------------------------+--------------------------------------------------
Reporter: jpflori | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7.1
Component: symbolics | Keywords: pynac
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
-------------------------+--------------------------------------------------
Old description:
> Here is a short example found by Burcin and reproducing the bug:
>
> {{{
> b = [var('b_%s'%i) for i in range(4)]
>
> precomp = (2^b_2 + 2)*(2^b_1 + 2^(-b_1) + 2^b_1*2^b_0 - 2^b_1*2^(-b_0)
> - 2^(-b_1)*2^b_0 - 2^(-b_1)*2^(-b_0) + 2^b_0 + 2^(-b_0) - 9) + (2^b_1 +
> 2^(-b_1) + 2^b_1*2^b_0 - 2^b_1*2^(-b_0) - 2^(-b_1)*2^b_0 -
> 2^(-b_1)*2^(-b_0) + 2^b_0 + 2^(-b_0) - 9)/2^b_2
>
> repl_dict = {b_0: b_0, b_3: b_1, b_2: b_3, b_1: b_2}
> P = precomp.substitute(repl_dict)
> P.expand()
> }}}
> This is already being discussed here: http://groups.google.com/group
> /sage-support/browse_thread/thread/7c85f02c76012722
>
> The following patches are for the Sage library to enable access to the
> PyNaC order and randomly test that it is a SWO:
>
> Apply
> [attachment:trac_9880_fix_import.patch],
> [attachment:trac_9880_pynac_order.patch],
> [attachment:trac_9880_randomized_testing.patch]
New description:
Here is a short example found by Burcin and reproducing the bug:
{{{
b = [var('b_%s'%i) for i in range(4)]
precomp = (2^b_2 + 2)*(2^b_1 + 2^(-b_1) + 2^b_1*2^b_0 - 2^b_1*2^(-b_0)
- 2^(-b_1)*2^b_0 - 2^(-b_1)*2^(-b_0) + 2^b_0 + 2^(-b_0) - 9) + (2^b_1 +
2^(-b_1) + 2^b_1*2^b_0 - 2^b_1*2^(-b_0) - 2^(-b_1)*2^b_0 -
2^(-b_1)*2^(-b_0) + 2^b_0 + 2^(-b_0) - 9)/2^b_2
repl_dict = {b_0: b_0, b_3: b_1, b_2: b_3, b_1: b_2}
P = precomp.substitute(repl_dict)
P.expand()
}}}
This is already being discussed here: http://groups.google.com/group/sage-
support/browse_thread/thread/7c85f02c76012722
The following patches are for the Sage library to enable access to the
PyNaC order and randomly test that it is a SWO:
Apply
[attachment:trac_9880_fix_import.patch],
[attachment:trac_9880_pynac_order.take2.patch],
[attachment:trac_9880_randomized_testing.patch]
--
Comment(by burcin):
I changed the structure of the order classes a little. New patches are
available in my pynac queue:
https://bitbucket.org/burcin/pynac-patches/src
attachment:trac_9880_pynac_order.take2.patch should be applied to access
these functions from Sage.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9880#comment:42>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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