#20116: Random segfault in linbox charpoly
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.1
Component: packages: standard | Resolution:
Keywords: random_fail | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
I just got this on sage-7.1.beta5, which look related:
{{{
**********************************************************************
File "src/sage/schemes/elliptic_curves/ell_rational_field.py", line 3807,
in
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.congruence_number
Failed example:
E.congruence_number() # long time (4s on sage.math, 2011)
Exception raised:
Traceback (most recent call last):
File "/usr/local/src/sage-git/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 496, in _run
self.compile_and_execute(example, compiler, test.globs)
File "/usr/local/src/sage-git/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 858, in compile_and_execute
exec(compiled, globs)
File "<doctest
sage.schemes.elliptic_curves.ell_rational_field.EllipticCurve_rational_field.congruence_number[8]>",
line 1, in <module>
E.congruence_number() # long time (4s on sage.math, 2011)
File "/usr/local/src/sage-git/local/lib/python2.7/site-
packages/sage/schemes/elliptic_curves/ell_rational_field.py", line 3847,
in congruence_number
V = W.complement().cuspidal_subspace()
File "sage/misc/cachefunc.pyx", line 1909, in
sage.misc.cachefunc.CachedMethodCaller.__call__
(build/cythonized/sage/misc/cachefunc.c:9941)
w = self._instance_call(*args, **kwds)
File "sage/misc/cachefunc.pyx", line 1785, in
sage.misc.cachefunc.CachedMethodCaller._instance_call
(build/cythonized/sage/misc/cachefunc.c:9408)
return self.f(self._instance, *args, **kwds)
File "/usr/local/src/sage-git/local/lib/python2.7/site-
packages/sage/modular/hecke/submodule.py", line 370, in complement
g = T.charpoly('x')
File "sage/matrix/matrix_rational_dense.pyx", line 946, in
sage.matrix.matrix_rational_dense.Matrix_rational_dense.charpoly
(build/cythonized/sage/matrix/matrix_rational_dense.c:11037)
f = A.charpoly(var, algorithm='linbox')
File "sage/matrix/matrix_integer_dense.pyx", line 1252, in
sage.matrix.matrix_integer_dense.Matrix_integer_dense.charpoly
(build/cythonized/sage/matrix/matrix_integer_dense.c:12798)
g = self._charpoly_linbox(var)
File "sage/matrix/matrix_integer_dense.pyx", line 1305, in
sage.matrix.matrix_integer_dense.Matrix_integer_dense._charpoly_linbox
(build/cythonized/sage/matrix/matrix_integer_dense.c:13598)
return self._poly_linbox(var=var, typ='charpoly')
File "sage/matrix/matrix_integer_dense.pyx", line 1328, in
sage.matrix.matrix_integer_dense.Matrix_integer_dense._poly_linbox
(build/cythonized/sage/matrix/matrix_integer_dense.c:13957)
sig_on()
MemoryError: failed to allocate 8589934600 bytes
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/20116#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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