On Feb 11, 12:14 am, Carl Witty <[EMAIL PROTECTED]> wrote:
> On Feb 10, 6:58 am, "John Cremona" <[EMAIL PROTECTED]> wrote:
>
>
>
> > First the bad news:
> > ----------------------------------------------------------------------
> > | SAGE Version 2.10.1, Release Date: 2008-02-02 |
> > | Type notebook() for the GUI, and license() for information. |
> > ----------------------------------------------------------------------
>
> > sage: E=EllipticCurve(GF(5),[1,1])
> > sage: E1=E.base_extend(GF(125,'a'))
> > sage: E2=E1.base_extend(GF(125^2,'b'))
>
> > ------------------------------------------------------------
> > 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).
> > ------------------------------------------------------------
>
> Here's part of the backtrace I see on my laptop for this crash:
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0xb7dfb8c0 (LWP 15819)]
> 0xb5443782 in
> __pyx_f_4sage_5rings_19finite_field_givaro_25FiniteField_givaroElement__add_c_impl
> (__pyx_v_self=0x9e10d74, __pyx_v_right=0x9e10f7c)
> at /home/cwitty/sage/local//include/givaro/givgfq.inl:292
> 292 { _GIVARO_GFQ_ADD(r, a, b, GFqDom<TT>::_qm1,
> GFqDom<TT>::_plus1) ; return r; }
> (gdb) bt
> #0 0xb5443782 in
> __pyx_f_4sage_5rings_19finite_field_givaro_25FiniteField_givaroElement__add_c_impl
> (__pyx_v_self=0x9e10d74, __pyx_v_right=0x9e10f7c)
> at /home/cwitty/sage/local//include/givaro/givgfq.inl:292
> #1 0xb71eac7f in
> __pyx_pf_4sage_9structure_7element_13ModuleElement___add__ (
> __pyx_v_left=0x9e10d74, __pyx_v_right=0x9e10f7c)
> at sage/structure/element.c:15976
> #2 0x0805ce33 in binary_op1 (v=0x9e10d74, w=0xbfb53d64, op_slot=0)
> at Objects/abstract.c:398
> #3 0x0805d310 in PyNumber_Add (v=0x9e10d74, w=0x9e10f7c)
> at Objects/abstract.c:638
>
> Carl
Hi,
I tried to find the problem in trac, but it doesn't seem to be there.
Carl: Could you open a ticket in case it isn't there yet?
Cheers,
Michael
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