#4527: Exception in
'sage.matrix.matrix_integer_dense.Matrix_integer_dense._hnf_modn_impl'
----------------------+-----------------------------------------------------
Reporter: syazdani | Owner: tbd
Type: defect | Status: new
Priority: major | Milestone:
Component: algebra | Keywords:
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Hi,
the following code raises an exception that crashes sage on my computer:
{{{
cond=206
J=J0(206)
D=J.new_subvariety().decomposition()
Jp=J.old_subvariety(2)
Jpc=Jp.cuspidal_subgroup()
Ac=D[3].cuspidal_subgroup()
Ac.intersection(Jpc)
}}}
The error I get (running it through the notebook) is
{{{
Exception in
'sage.matrix.matrix_integer_dense.Matrix_integer_dense._hnf_modn_impl'
ignored
------------------------------------------------------------
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 seems very sensitive to the set of inputs, but it is consistent on my
computer.
I'm running sage 3.1.4 (release date 2008-10-20), on mandriva, compiled
with gcc 4.2.2 20071128.
Soroosh
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4527>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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