#12313: Fix yet another memory leak caused by caching of coercion data
-------------------------------------------------+--------------------------
Reporter: SimonKing | Owner:
Type: defect | Status:
positive_review
Priority: major | Milestone: sage-pending
Component: memleak | Resolution:
Keywords: coercion weak dictionary | Work issues:
Report Upstream: N/A | Reviewers: Simon King,
Jean-Pierre Flori, John Perry, Nils Bruin
Authors: Simon King, Jean-Pierre Flori | Merged in:
Dependencies: #715, #11521, #12215, #13746 | Stopgaps:
-------------------------------------------------+--------------------------
Comment (by nbruin):
Unfortunately, doctests don't all succeed for me. I've built 5.6rc0 from
scratch and applied #12215 and #12313. I get a SIGFPE in
{{{
./sage -t -force_lib devel/sage/sage/schemes/elliptic_curves/heegner.py
}}}
gdb:
{{{
Program received signal SIGFPE, Arithmetic exception.
__pyx_pf_4sage_9structure_11coerce_dict_16TripleDictEraser_2__call__
(__pyx_v_r=<optimized out>,
__pyx_v_self=<optimized out>) at sage/structure/coerce_dict.c:1107
1107 __pyx_t_10 = PyList_GET_ITEM(__pyx_t_1, (__pyx_v_h %
PyList_GET_SIZE(__pyx_t_4)));
(gdb) l
1102 */
1103 __pyx_t_1 = __pyx_v_self->D->buckets;
1104 __Pyx_INCREF(__pyx_t_1);
1105 __pyx_t_4 = __pyx_v_self->D->buckets;
1106 __Pyx_INCREF(__pyx_t_4);
1107 __pyx_t_10 = PyList_GET_ITEM(__pyx_t_1, (__pyx_v_h %
PyList_GET_SIZE(__pyx_t_4)));
(gdb) p PyString_AsString(PyObject_Repr(__pyx_t_4))
$4 = 0xd5090e4 "None"
}}}
So at this point `self.D.buckets==None`. Doing list-type transactions
using non-error checking macros is probably not a good idea. This code
corresponds to `structure/coerce_dict.pyx:121`. Apparently, a callback is
happening while the dictionary itself is already being torn down!
A traceback indeed shows that this is all happening as part of a garbage
collection of a TripleDict (I think that's what frame 15
indicates),ironically, triggered by the allocation of a new TripleDict.
I'm including rather a lot of the backtrace, because frame 100 is already
in the sage library: Apparently, some operations easily trigger 100 level
deep stacks!
{{{
(gdb) bt
#0 __pyx_pf_4sage_9structure_11coerce_dict_16TripleDictEraser_2__call__
(__pyx_v_r=<optimized out>,
__pyx_v_self=<optimized out>) at sage/structure/coerce_dict.c:1107
#1 __pyx_pw_4sage_9structure_11coerce_dict_16TripleDictEraser_3__call__
(__pyx_v_self=0xb4f17c0,
__pyx_args=<optimized out>, __pyx_kwds=<optimized out>) at
sage/structure/coerce_dict.c:966
#2 0x00007ffff7c6f403 in PyObject_Call (func=0xb4f17c0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#3 0x00007ffff7c6fcf0 in PyObject_CallFunctionObjArgs
(callable=0xb4f17c0) at Objects/abstract.c:2760
#4 0x00007ffff7cd7b91 in handle_callback (callback=0xb4f17c0,
ref=<optimized out>) at Objects/weakrefobject.c:881
#5 PyObject_ClearWeakRefs (object=<optimized out>) at
Objects/weakrefobject.c:965
#6 0x00007fffea42e0e8 in
__pyx_tp_dealloc_4sage_9structure_15category_object_CategoryObject
(o=0x7843e30)
at sage/structure/category_object.c:8990
#7 0x00007ffff7cc7b76 in subtype_dealloc (self=0x7843e30) at
Objects/typeobject.c:1014
#8 0x00007ffff7cc4fa3 in tupledealloc (op=0xc1518d0) at
Objects/tupleobject.c:220
#9 0x00007ffff7cc4fa3 in tupledealloc (op=0xc455c30) at
Objects/tupleobject.c:220
#10 0x00007ffff7ca905f in dict_dealloc (mp=0x7856310) at
Objects/dictobject.c:985
#11 0x00007ffff7cc7bc4 in subtype_dealloc (self=0xbdf2f10) at
Objects/typeobject.c:999
#12 0x00007fffe90f8cc7 in
__pyx_tp_dealloc_4sage_10categories_7functor_Functor (o=0xa7e09d0)
at sage/categories/functor.c:3209
#13 0x00007ffff7c9bb5a in list_dealloc (op=0xbbede60) at
Objects/listobject.c:309
#14 0x00007ffff7c9bb5a in list_dealloc (op=0xb771170) at
Objects/listobject.c:309
#15 0x00007fffe9dee8df in
__pyx_tp_clear_4sage_9structure_11coerce_dict_TripleDict (o=0xb8d73b0)
at sage/structure/coerce_dict.c:5921
#16 0x00007ffff7d4b637 in delete_garbage (old=0x7ffff7fe19e0,
collectable=0x7fffffff80f0) at Modules/gcmodule.c:769
#17 collect (generation=2) at Modules/gcmodule.c:930
#18 0x00007ffff7d4c1a8 in collect_generations () at Modules/gcmodule.c:996
#19 _PyObject_GC_Malloc (basicsize=<optimized out>) at
Modules/gcmodule.c:1457
#20 _PyObject_GC_Malloc (basicsize=<optimized out>) at
Modules/gcmodule.c:1439
#21 0x00007ffff7cc7c19 in PyType_GenericAlloc (type=0x7fffea004d00,
nitems=0) at Objects/typeobject.c:753
#22 0x00007fffe9dee7ef in
__pyx_tp_new_4sage_9structure_11coerce_dict_TripleDict (t=<optimized out>,
a=<optimized out>,
k=<optimized out>) at sage/structure/coerce_dict.c:5881
#23 0x00007ffff7ccbd83 in type_call (type=0x7fffea004d00, args=0xf507d0,
kwds=0x0) at Objects/typeobject.c:721
#24 0x00007ffff7c6f403 in PyObject_Call (func=0x7fffea004d00,
arg=<optimized out>, kw=<optimized out>)
at Objects/abstract.c:2529
#25 0x00007fffea65da43 in
__pyx_f_4sage_9structure_6parent_6Parent_init_coerce
(__pyx_v_self=0x5083a80,
__pyx_optional_args=<optimized out>) at sage/structure/parent.c:5765
#26 0x00007fffea8a00ff in
__pyx_f_4sage_9structure_10parent_old_6Parent_init_coerce
(__pyx_v_self=<optimized out>,
__pyx_optional_args=<optimized out>) at
sage/structure/parent_old.c:1634
#27 0x00007fffea8a6cc4 in
__pyx_pf_4sage_9structure_10parent_old_6Parent___init__
(__pyx_v_category=0x7ffff7fc6840,
__pyx_v_embeddings=0x1038908, __pyx_v_actions=0x10388c0,
__pyx_v_coerce_from=0x10381b8, __pyx_v_self=0x5083a80)
at sage/structure/parent_old.c:1329
#28 __pyx_pw_4sage_9structure_10parent_old_6Parent_1__init__
(__pyx_v_self=0x5083a80, __pyx_args=<optimized out>,
__pyx_kwds=0x508bf00) at sage/structure/parent_old.c:1297
#29 0x00007ffff7cc664c in wrap_init (self=<optimized out>, args=<optimized
out>, wrapped=<optimized out>,
kwds=<optimized out>) at Objects/typeobject.c:4719
#30 0x00007ffff7c6f403 in PyObject_Call (func=0xd30f710, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#31 0x00007ffff7d0cc97 in PyEval_CallObjectWithKeywords (func=0xd30f710,
arg=0x7ffff7bbb050, kw=<optimized out>)
at Python/ceval.c:3890
#32 0x00007ffff7c86e69 in wrapperdescr_call (descr=<optimized out>,
args=0x7ffff7bbb050, kwds=0x508bf00)
at Objects/descrobject.c:306
#33 0x00007ffff7c6f403 in PyObject_Call (func=0xfc0960, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#34 0x00007fffeaab5269 in
__pyx_pf_4sage_9structure_11parent_base_14ParentWithBase___init__ (
__pyx_v_category=0x7ffff7fc6840, __pyx_v_embeddings=0x1038908,
__pyx_v_actions=0x10388c0,
__pyx_v_coerce_from=0x10381b8, __pyx_v_base=0x8593c60,
__pyx_v_self=0x5083a80) at sage/structure/parent_base.c:1258
---Type <return> to continue, or q <return> to quit---
#35 __pyx_pw_4sage_9structure_11parent_base_14ParentWithBase_1__init__
(__pyx_v_self=0x5083a80,
__pyx_args=<optimized out>, __pyx_kwds=<optimized out>) at
sage/structure/parent_base.c:1221
#36 0x00007ffff7cc664c in wrap_init (self=<optimized out>, args=<optimized
out>, wrapped=<optimized out>,
kwds=<optimized out>) at Objects/typeobject.c:4719
#37 0x00007ffff7c6f403 in PyObject_Call (func=0xd30f6d0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#38 0x00007ffff7d0cc97 in PyEval_CallObjectWithKeywords (func=0xd30f6d0,
arg=0xd2f7d90, kw=<optimized out>)
at Python/ceval.c:3890
#39 0x00007ffff7c86e69 in wrapperdescr_call (descr=<optimized out>,
args=0xd2f7d90, kwds=0x508bde0)
at Objects/descrobject.c:306
#40 0x00007ffff7c6f403 in PyObject_Call (func=0x1033320, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#41 0x00007fffe746a727 in
__pyx_pf_4sage_9structure_11parent_gens_14ParentWithGens___init__ (
__pyx_v_category=0x7ffff7fc6840, __pyx_v_normalize=<optimized out>,
__pyx_v_names=0x7ffff7fc6840,
__pyx_v_base=0x8593c60, __pyx_v_self=0x5083a80) at
sage/structure/parent_gens.c:2781
#42 __pyx_pw_4sage_9structure_11parent_gens_14ParentWithGens_1__init__
(__pyx_v_self=0x5083a80,
__pyx_args=<optimized out>, __pyx_kwds=<optimized out>) at
sage/structure/parent_gens.c:2697
#43 0x00007ffff7cc664c in wrap_init (self=<optimized out>, args=<optimized
out>, wrapped=<optimized out>,
kwds=<optimized out>) at Objects/typeobject.c:4719
#44 0x00007ffff7c6f403 in PyObject_Call (func=0xd29f0d0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#45 0x00007ffff7d0cc97 in PyEval_CallObjectWithKeywords (func=0xd29f0d0,
arg=0xd2a2290, kw=<optimized out>)
at Python/ceval.c:3890
#46 0x00007ffff7c86e69 in wrapperdescr_call (descr=<optimized out>,
args=0xd2a2290, kwds=0x0)
at Objects/descrobject.c:306
#47 0x00007ffff7c6f403 in PyObject_Call (func=0x1033cd0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#48 0x00007ffff7d1124d in do_call (nk=<optimized out>, na=<optimized out>,
pp_stack=0x7fffffff8830, func=0x1033cd0)
at Python/ceval.c:4239
#49 call_function (oparg=<optimized out>, pp_stack=0x7fffffff8830) at
Python/ceval.c:4044
#50 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at
Python/ceval.c:2666
#51 0x00007ffff7d14275 in PyEval_EvalCodeEx (co=<optimized out>,
globals=<optimized out>, locals=<optimized out>,
args=<optimized out>, argcount=5, kws=0x7ffff7bbb068, kwcount=0,
defs=0x1c61bf0, defcount=2, closure=0x0)
at Python/ceval.c:3253
#52 0x00007ffff7c97273 in function_call (func=0x1db1488, arg=0xd1b27d0,
kw=0x50af1a0) at Objects/funcobject.c:526
#53 0x00007ffff7c6f403 in PyObject_Call (func=0x1db1488, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#54 0x00007ffff7c7cb4f in instancemethod_call (func=0x1db1488,
arg=0xd1b27d0, kw=0x50af1a0) at Objects/classobject.c:2578
#55 0x00007ffff7c6f403 in PyObject_Call (func=0xd2d7230, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#56 0x00007ffff7ccffd0 in slot_tp_init (self=0x5083a80, args=0xd1de100,
kwds=0x50af1a0) at Objects/typeobject.c:5663
#57 0x00007ffff7ccbdc8 in type_call (type=<optimized out>, args=0xd1de100,
kwds=0x50af1a0) at Objects/typeobject.c:737
#58 0x00007fffed3f5766 in
__pyx_pf_4sage_4misc_19classcall_metaclass_typecall
(__pyx_v_opts=0x50af1a0,
__pyx_v_args=0xd1de100, __pyx_v_cls=0x1ee43a0, __pyx_self=<optimized
out>) at sage/misc/classcall_metaclass.c:1294
#59 __pyx_pw_4sage_4misc_19classcall_metaclass_1typecall
(__pyx_self=<optimized out>, __pyx_args=<optimized out>,
__pyx_kwds=<optimized out>) at sage/misc/classcall_metaclass.c:1257
#60 0x00007ffff7d12198 in ext_do_call (nk=0, na=<optimized out>,
flags=<optimized out>, pp_stack=0x7fffffff8e60,
func=0x995c20) at Python/ceval.c:4331
#61 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at
Python/ceval.c:2705
#62 0x00007ffff7d14275 in PyEval_EvalCodeEx (co=<optimized out>,
globals=<optimized out>, locals=<optimized out>,
args=<optimized out>, argcount=5, kws=0x7ffff7bbb068, kwcount=0,
defs=0x0, defcount=0, closure=0x0)
at Python/ceval.c:3253
#63 0x00007ffff7c97273 in function_call (func=0x99d050, arg=0xd1d4710,
kw=0x6004d00) at Objects/funcobject.c:526
#64 0x00007ffff7c6f403 in PyObject_Call (func=0x99d050, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
---Type <return> to continue, or q <return> to quit---
#65 0x00007fffed816e8d in
__pyx_pf_4sage_4misc_9cachefunc_18WeakCachedFunction_2__call__
(__pyx_v_kwds=0x6004d00,
__pyx_v_args=0xd1d4710, __pyx_v_self=0x919f30) at
sage/misc/cachefunc.c:5080
#66 __pyx_pw_4sage_4misc_9cachefunc_18WeakCachedFunction_3__call__
(__pyx_v_self=0x919f30, __pyx_args=0xd1d4710,
__pyx_kwds=<optimized out>) at sage/misc/cachefunc.c:4888
#67 0x00007ffff7c6f403 in PyObject_Call (func=0x919f30, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#68 0x00007ffff7d1124d in do_call (nk=<optimized out>, na=<optimized out>,
pp_stack=0x7fffffff9220, func=0x919f30)
at Python/ceval.c:4239
#69 call_function (oparg=<optimized out>, pp_stack=0x7fffffff9220) at
Python/ceval.c:4044
#70 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at
Python/ceval.c:2666
#71 0x00007ffff7d14275 in PyEval_EvalCodeEx (co=<optimized out>,
globals=<optimized out>, locals=<optimized out>,
args=<optimized out>, argcount=4, kws=0xd2ff608, kwcount=1,
defs=0x1bf4968, defcount=2, closure=0x0)
at Python/ceval.c:3253
#72 0x00007ffff7c97273 in function_call (func=0x1db1140, arg=0xd2caaa0,
kw=0x6456560) at Objects/funcobject.c:526
#73 0x00007ffff7c6f403 in PyObject_Call (func=0x1db1140, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#74 0x00007fffed3f4a13 in
__pyx_pf_4sage_4misc_19classcall_metaclass_18ClasscallMetaclass_2__call__
(
__pyx_v_opts=0x6456560, __pyx_v_args=0xd2a4690, __pyx_v_cls=0x1ee43a0)
at sage/misc/classcall_metaclass.c:932
#75
__pyx_pw_4sage_4misc_19classcall_metaclass_18ClasscallMetaclass_3__call__
(__pyx_v_cls=0x1ee43a0,
__pyx_args=0xd2a4690, __pyx_kwds=<optimized out>) at
sage/misc/classcall_metaclass.c:872
#76 0x00007ffff7c6f403 in PyObject_Call (func=0x1ee43a0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#77 0x00007fffd42b707d in
__pyx_f_4sage_6matrix_20matrix_integer_dense_20Matrix_integer_dense__mod_int_c
(
__pyx_v_self=0xd2725f0, __pyx_v_p=19) at
sage/matrix/matrix_integer_dense.c:13674
#78 0x00007fffd429678a in
__pyx_pf_4sage_6matrix_20matrix_integer_dense_20Matrix_integer_dense_46_mod_int
(
__pyx_v_modulus=0xbbe8390, __pyx_v_self=0xd2725f0) at
sage/matrix/matrix_integer_dense.c:13277
#79
__pyx_pw_4sage_6matrix_20matrix_integer_dense_20Matrix_integer_dense_47_mod_int
(__pyx_v_self=0xd2725f0,
__pyx_v_modulus=0xbbe8390) at sage/matrix/matrix_integer_dense.c:13196
#80 0x00007ffff7c6f403 in PyObject_Call (func=0xd2967a0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#81 0x00007fffd3c13807 in
__pyx_pf_4sage_6matrix_21matrix_rational_dense_21Matrix_rational_dense_56change_ring
(
__pyx_v_R=<optimized out>, __pyx_v_self=0xd302398) at
sage/matrix/matrix_rational_dense.c:14605
#82
__pyx_pw_4sage_6matrix_21matrix_rational_dense_21Matrix_rational_dense_57change_ring
(__pyx_v_self=0xd302398,
__pyx_v_R=<optimized out>) at
sage/matrix/matrix_rational_dense.c:14120
#83 0x00007ffff7d13158 in call_function (oparg=<optimized out>,
pp_stack=0x7fffffff9710) at Python/ceval.c:4009
#84 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at
Python/ceval.c:2666
#85 0x00007ffff7d133cb in fast_function (nk=<optimized out>, na=2,
n=<optimized out>, pp_stack=0x7fffffff9870,
func=0x195a398) at Python/ceval.c:4107
#86 call_function (oparg=<optimized out>, pp_stack=0x7fffffff9870) at
Python/ceval.c:4042
#87 PyEval_EvalFrameEx (f=<optimized out>, throwflag=<optimized out>) at
Python/ceval.c:2666
#88 0x00007ffff7d14275 in PyEval_EvalCodeEx (co=<optimized out>,
globals=<optimized out>, locals=<optimized out>,
args=<optimized out>, argcount=2, kws=0x0, kwcount=0, defs=0x0,
defcount=0, closure=0x0) at Python/ceval.c:3253
#89 0x00007ffff7c9717c in function_call (func=0x195a230, arg=0xd3122d8,
kw=0x0) at Objects/funcobject.c:526
#90 0x00007ffff7c6f403 in PyObject_Call (func=0x195a230, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#91 0x00007ffff7c7cb4f in instancemethod_call (func=0x195a230,
arg=0xd3122d8, kw=0x0) at Objects/classobject.c:2578
#92 0x00007ffff7c6f403 in PyObject_Call (func=0xd2a49b0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#93 0x00007fffd62ed50b in
__pyx_pf_4sage_5rings_13residue_field_19ResidueFieldFactory_2create_object
(
__pyx_v_key=<optimized out>, __pyx_self=<optimized out>,
__pyx_v_self=<optimized out>,
__pyx_v_version=<optimized out>, __pyx_v_kwds=<optimized out>) at
sage/rings/residue_field.c:5002
#94
__pyx_pw_4sage_5rings_13residue_field_19ResidueFieldFactory_3create_object
(__pyx_self=<optimized out>,
__pyx_args=<optimized out>, __pyx_kwds=<optimized out>) at
sage/rings/residue_field.c:4295
#95 0x00007ffff7c6f403 in PyObject_Call (func=0x1c8c1a0, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
---Type <return> to continue, or q <return> to quit---
#96 0x00007ffff7c7cb4f in instancemethod_call (func=0x1c8c1a0,
arg=0xd2a4370, kw=0x64430f0) at Objects/classobject.c:2578
#97 0x00007ffff7c6f403 in PyObject_Call (func=0xd2faa50, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#98 0x00007fffdec2d5d6 in
__pyx_f_4sage_9structure_7factory_13UniqueFactory_get_object
(__pyx_v_self=0x1c8e0a8,
__pyx_v_version=0x162df50, __pyx_v_key=0xd0378c0,
__pyx_v_extra_args=0x64430f0, __pyx_skip_dispatch=<optimized out>)
at sage/structure/factory.c:1311
#99 0x00007fffdec2cb70 in
__pyx_pf_4sage_9structure_7factory_13UniqueFactory_4__call__
(__pyx_v_kwds=0x64430f0,
__pyx_v_args=0xd30f1d0, __pyx_v_self=0x1c8e0a8) at
sage/structure/factory.c:1119
#100 __pyx_pw_4sage_9structure_7factory_13UniqueFactory_5__call__
(__pyx_v_self=0x1c8e0a8, __pyx_args=0xd30f1d0,
__pyx_kwds=<optimized out>) at sage/structure/factory.c:987
#101 0x00007ffff7c6f403 in PyObject_Call (func=0x1c8e0a8, arg=<optimized
out>, kw=<optimized out>)
at Objects/abstract.c:2529
#102 0x00007ffff7d1124d in do_call (nk=<optimized out>, na=<optimized
out>, pp_stack=0x7fffffffa360, func=0x1c8e0a8)
at Python/ceval.c:4239
}}}
Anyway, I had originally thought that callbacks in these situations would
be collected and discarded, but apparently we have a scenario here that's
not detected by the python GC. If my diagnosis is correct, we should not
assume that attributes on `self.D` are still valid in `TripleDictEraser`,
which surprises me a bit. It's easily checked of course: If
`self.D.buckets` is `None`, we don't have to do anything. Relevant code:
{{{
static int
__pyx_tp_clear_4sage_9structure_11coerce_dict_TripleDict(PyObject *o) {
struct __pyx_obj_4sage_9structure_11coerce_dict_TripleDict *p = (struct
__pyx_obj_4sage_9structure_11coerce_dict_TripleDict *)o;
PyObject* tmp;
tmp = ((PyObject*)p->buckets);
p->buckets = Py_None; Py_INCREF(Py_None);
Py_XDECREF(tmp);
tmp = ((PyObject*)p->_refcache);
p->_refcache = ((PyObject*)Py_None); Py_INCREF(Py_None);
Py_XDECREF(tmp);
tmp = ((PyObject*)p->eraser);
p->eraser = ((struct
__pyx_obj_4sage_9structure_11coerce_dict_TripleDictEraser *)Py_None);
Py_INCREF(Py_None);
Py_XDECREF(tmp);
return 0;
}
}}}
so indeed, `D.buckets` is set to `None` before `D.buckets` is deleted. I'm
surprised that this deletion (of something that is garbage, so the eraser,
which has an indirect strong link to it, must be garbage as well)
apparently can still trigger a callback. It wouldn't surprise me if we
could engineer this into something that would be considered a bug in
Python. Anyway, to be safe, check that self.D.buckets is still alive
before we do something with it! (either that or my sage/python build is
seriously screwed and I'm seeing something that shouldn't happen).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12313#comment:266>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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