Tim Peters added the comment:
Hmm. Looks like it's dying in gcmodule.c's visit_decref(), here:
if (PyObject_IS_GC(op)) {
So it may or may not trigger depending on the vagaries of when cyclic gc runs.
For op, op->_ob_next, _ob_prev, ob_refcnt, and ob_type are all 0xdddddddd.
That doesn't look good - LOL ;-)
Here's the call stack:
> python34_d.dll!visit_decref(_object * op, void * data) Line 373 + 0x6
> bytes C
python34_d.dll!tupletraverse(PyTupleObject * o, int (_object *, void
*)* visit, void * arg) Line 564 + 0x1f bytes C
python34_d.dll!subtract_refs(_gc_head * containers) Line 400 + 0x11
bytes C
python34_d.dll!collect(int generation, int * n_collected, int *
n_uncollectable, int nofail) Line 957 + 0x9 bytes C
python34_d.dll!collect_with_callback(int generation) Line 1128 + 0x13
bytes C
python34_d.dll!collect_generations() Line 1151 + 0x9 bytes C
python34_d.dll!_PyObject_GC_Malloc(unsigned int basicsize) Line 1740
C
python34_d.dll!_PyObject_GC_New(_typeobject * tp) Line 1749 + 0xc
bytes C
python34_d.dll!mbuf_alloc() Line 68 + 0xa bytes C
python34_d.dll!_PyManagedBuffer_FromObject(_object * base) Line 84 +
0x5 bytes C
python34_d.dll!PyMemoryView_FromObject(_object * v) Line 789 + 0x9
bytes C
python34_d.dll!bytesio_getbuffer(bytesio * self) Line 220 + 0x9 bytes
C
python34_d.dll!call_function(_object * * * pp_stack, int oparg) Line
4208 + 0x16 bytes C
python34_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 2828
C
python34_d.dll!PyEval_EvalCodeEx(_object * _co, _object * globals,
_object * locals, _object * * args, int argcount, _object * * kws, int kwcount,
_object * * defs, int defcount, _object * kwdefs, _object * closure) Line 3576
+ 0xb bytes C
python34_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4335 + 0x38 bytes C
python34_d.dll!call_function(_object * * * pp_stack, int oparg) Line
4250 + 0x15 bytes C
python34_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 2828
C
python34_d.dll!PyEval_EvalCodeEx(_object * _co, _object * globals,
_object * locals, _object * * args, int argcount, _object * * kws, int kwcount,
_object * * defs, int defcount, _object * kwdefs, _object * closure) Line 3576
+ 0xb bytes C
python34_d.dll!function_call(_object * func, _object * arg, _object *
kw) Line 638 + 0x41 bytes C
python34_d.dll!PyObject_Call(_object * func, _object * arg, _object *
kw) Line 2087 + 0xf bytes C
python34_d.dll!ext_do_call(_object * func, _object * * * pp_stack, int
flags, int na, int nk) Line 4549 + 0x8 bytes C
python34_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 2869
C
python34_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4323 C
python34_d.dll!call_function(_object * * * pp_stack, int oparg) Line
4250 + 0x15 bytes C
python34_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 2828
C
python34_d.dll!fast_function(_object * func, _object * * * pp_stack,
int n, int na, int nk) Line 4323 C
python34_d.dll!call_function(_object * * * pp_stack, int oparg) Line
4250 + 0x15 bytes C
python34_d.dll!PyEval_EvalFrameEx(_frame * f, int throwflag) Line 2828
C
python34_d.dll!PyEval_EvalCodeEx(_object * _co, _object * globals,
_object * locals, _object * * args, int argcount, _object * * kws, int kwcount,
_object * * defs, int defcount, _object * kwdefs, _object * closure) Line 3576
+ 0xb bytes C
python34_d.dll!function_call(_object * func, _object * arg, _object *
kw) Line 638 + 0x41 bytes C
python34_d.dll!PyObject_Call(_object * func, _object * arg, _object *
kw) Line 2087 + 0xf bytes C
python34_d.dll!method_call(_object * func, _object * arg, _object * kw)
Line 347 + 0x11 bytes C
python34_d.dll!PyObject_Call(_object * func, _object * arg, _object *
kw) Line 2087 + 0xf bytes C
python34_d.dll!PyEval_CallObjectWithKeywords(_object * func, _object *
arg, _object * kw) Line 4102 C
python34_d.dll!t_bootstrap(void * boot_raw) Line 1000 + 0x1a bytes
C
python34_d.dll!bootstrap(void * call) Line 175 + 0x7 bytes C
msvcr100d.dll!_callthreadstartex() Line 314 + 0xf bytes C
msvcr100d.dll!_threadstartex(void * ptd) Line 297 C
kernel32.dll!76fdd2e9()
[Frames below may be incorrect and/or missing, no symbols loaded for
kernel32.dll]
ntdll.dll!77181603()
ntdll.dll!771815d6()
----------
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<http://bugs.python.org/issue19779>
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