#8580: bug in matrix_mod2_dense (m4ri wrapper?): exhibited by bug in coercing
into
a 0-dimensional qotient vector space
------------------------------+---------------------------------------------
Reporter: was | Owner: malb
Type: defect | Status: new
Priority: major | Milestone: sage-4.4
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------------+---------------------------------------------
Changes (by was):
* owner: was => malb
Old description:
> {{{
> wst...@boxen:~$ /usr/local/bin/sage
> ----------------------------------------------------------------------
> | Sage Version 4.3.4, Release Date: 2010-03-19 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: V = GF(2)^3
> sage: (V/V)(V.0)
>
> ------------------------------------------------------------
> 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).
> ------------------------------------------------------------
> }}}
>
> This is because of a bug in m4ri (or our wrapper of it), since with p=3
> (instead of 2) everything works fine:
> {{{
> sage: V = GF(3)^3
> sage: (V/V)(V.0)
> ()
> sage:
> }}}
New description:
{{{
wst...@boxen:~$ /usr/local/bin/sage
----------------------------------------------------------------------
| Sage Version 4.3.4, Release Date: 2010-03-19 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: V = GF(2)^3
sage: (V/V)(V.0)
------------------------------------------------------------
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).
------------------------------------------------------------
}}}
This is because of a bug in m4ri (or our wrapper of it), since with p=3
(instead of 2) everything works fine:
{{{
sage: V = GF(3)^3
sage: (V/V)(V.0)
()
sage:
}}}
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8580#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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