#13710: Double free in polybori
------------------------+---------------------------------------------------
Reporter: nbruin | Owner: rlm
Type: defect | Status: new
Priority: critical | Milestone: sage-5.5
Component: memleak | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
------------------------+---------------------------------------------------
{{{
import gc
def test():
gc.collect()
sr =
mq.SR(Integer(2),Integer(1),Integer(2),Integer(4),gf2=True,polybori=True)###line
25:_sage_ sage: sr = mq.SR(2,1,2,4,gf2=True,polybori=True)
gc.collect()
set_random_seed(Integer(1))###line 32:_sage_ sage: set_random_seed(1)
gc.collect()
F,s = sr.polynomial_system()###line 33:_sage_ sage: F,s =
sr.polynomial_system()
gc.collect()
r2 = F.part(Integer(2)); r2###line 37:_sage_ sage: r2 = F.part(2); r2
gc.collect()
C = Sequence(r2).connected_components(); C###line 73:_sage_ sage: C =
Sequence(r2).connected_components(); C
gc.collect()
C[Integer(0)].groebner_basis()###line 107:_sage_ sage:
C[0].groebner_basis()
gc.collect()
A,v = Sequence(r2).coefficient_matrix()###line 112:_sage_ sage: A,v =
Sequence(r2).coefficient_matrix()
gc.collect()
A.rank()###line 113:_sage_ sage: A.rank()
test()
}}}
The following causes:
{{{
sage: test()
*** glibc detected *** python: double free or corruption (out):
0x000000000574bf00 ***
======= Backtrace: =========
/lib64/libc.so.6[0x31cfe7da76]
/lib64/libc.so.6[0x31cfe7ed5e]
/usr/local/sage/5.0/local/lib/python2.7/site-
packages/sage/rings/polynomial/pbori.so(+0x7a2aa)[0x7f3e724bb2aa]
/usr/local/sage/5.0/local/lib/python2.7/site-
packages/sage/rings/polynomial/pbori.so(+0x1c633)[0x7f3e7245d633]
/usr/local/sage/5.0/local/lib/libpython2.7.so.1.0(+0x1266f7)[0x7f3e996f56f7]
/usr/local/sage/5.0/local/lib/libpython2.7.so.1.0(+0x126e89)[0x7f3e996f5e89]
}}}
A traceback under GDB gives
{{{
#0 0x00000031cfe36285 in raise () from /lib64/libc.so.6
#1 0x00000031cfe37b9b in abort () from /lib64/libc.so.6
#2 0x00000031cfe7774e in __libc_message () from /lib64/libc.so.6
#3 0x00000031cfe7da76 in malloc_printerr () from /lib64/libc.so.6
#4 0x00000031cfe7ed5e in _int_free () from /lib64/libc.so.6
#5 0x00007fffd0e5f2aa in Delete<polybori::groebner::ReductionStrategy>
(mem=0x4c631b0) at /usr/local/sage/5.0/local/include/csage/ccobject.h:77
#6
__pyx_pf_4sage_5rings_10polynomial_5pbori_17ReductionStrategy_1__dealloc__
(__pyx_v_self=0x4c1a1d0) at sage/rings/polynomial/pbori.cpp:33393
#7 __pyx_tp_dealloc_4sage_5rings_10polynomial_5pbori_ReductionStrategy
(o=0x4c1a1d0) at sage/rings/polynomial/pbori.cpp:46504
#8 0x00007fffd0e01633 in
__pyx_tp_clear_4sage_5rings_10polynomial_5pbori_GroebnerStrategy
(o=0x4c138c0) at sage/rings/polynomial/pbori.cpp:46766
#9 0x00007ffff7d4c6f7 in delete_garbage (old=0x7ffff7fe1f00,
collectable=0x7fffffffc210) at Modules/gcmodule.c:769
#10 collect (generation=2) at Modules/gcmodule.c:930
#11 0x00007ffff7d4ce89 in gc_collect (self=<optimized out>,
args=<optimized out>, kws=<optimized out>) at Modules/gcmodule.c:1067
}}}
so it should be pretty straightforward find the culprit.
Bug manifests itself on both sage 5.0 and sage 5.5beta2(unreleased).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13710>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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