IOCP and memory management
OLD project page for the Python extensions for Windows
Brought to you by:
mhammond
Menu
▾
▴
#744 IOCP and memory management
Hi!
I'm trying to use IOCP on Windows 7/10 with pywin32. My program uses asyncoro, which implements async events using with pywin32. I met very cryptic issue with it. After some time python interpreter dies with crash in GC. Example:
0:005> k # Child-SP RetAddr Call Site 00 00000000`03e7efc0 00000000`778a1edf python27!BaseException_dealloc+0x16 [c:\build27\cpython\objects\exceptions.c @ 83] 01 00000000`03e7eff0 00000000`778e84ce python27!tupledealloc+0xcf [c:\build27\cpython\objects\tupleobject.c @ 222] 02 00000000`03e7f020 00000000`778eca11 python27!PyEval_EvalFrameEx+0xa4e [c:\build27\cpython\python\ceval.c @ 2483] 03 00000000`03e7f130 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 04 00000000`03e7f1e0 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 05 00000000`03e7f260 00000000`778ee8eb python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 06 00000000`03e7f290 00000000`778eb573 python27!ext_do_call+0x2eb [c:\build27\cpython\python\ceval.c @ 4666] 07 00000000`03e7f2f0 00000000`778ee178 python27!PyEval_EvalFrameEx+0x3af3 [c:\build27\cpython\python\ceval.c @ 3031] 08 00000000`03e7f400 00000000`778ee02f python27!fast_function+0xc8 [c:\build27\cpython\python\ceval.c @ 4438] 09 00000000`03e7f470 00000000`778eb49b python27!call_function+0x3af [c:\build27\cpython\python\ceval.c @ 4372] 0a 00000000`03e7f4d0 00000000`778ee178 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 0b 00000000`03e7f5e0 00000000`778ee02f python27!fast_function+0xc8 [c:\build27\cpython\python\ceval.c @ 4438] 0c 00000000`03e7f650 00000000`778eb49b python27!call_function+0x3af [c:\build27\cpython\python\ceval.c @ 4372] 0d 00000000`03e7f6b0 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 0e 00000000`03e7f7c0 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 0f 00000000`03e7f870 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 10 00000000`03e7f8f0 00000000`778575d9 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 11 00000000`03e7f920 00000000`77842d23 python27!instancemethod_call+0x219 [c:\build27\cpython\objects\classobject.c @ 2603] 12 00000000`03e7fba0 00000000`778edb41 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 13 00000000`03e7fbd0 00000000`7780cb1e python27!PyEval_CallObjectWithKeywords+0x141 [c:\build27\cpython\python\ceval.c @ 4222] 14 00000000`03e7fc00 00000000`77931405 python27!t_bootstrap+0x9e [c:\build27\cpython\modules\threadmodule.c @ 621] 15 00000000`03e7fc30 00000000`77c72fdf python27!bootstrap+0x35 [c:\build27\cpython\python\thread_nt.h @ 124] 16 00000000`03e7fc60 00000000`77c73080 MSVCR90!_callthreadstartex+0x17 [f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c @ 348] 17 00000000`03e7fc90 00007ff9`6ebe8364 MSVCR90!_threadstartex+0x84 [f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c @ 326] 18 00000000`03e7fcc0 00007ff9`6f1570d1 KERNEL32!BaseThreadInitThunk+0x14 19 00000000`03e7fcf0 00000000`00000000 ntdll!RtlUserThreadStart+0x21
static void
BaseException_dealloc(PyBaseExceptionObject *self)
{
_PyObject_GC_UNTRACK(self); <<<--- HERE
BaseException_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
This trace was with gc.set_threshold(0)
Without disabled gc, it will die during garbage collection:
0:005> k # Child-SP RetAddr Call Site 00 00000000`04bfd250 00000000`778a4fc8 python27!visit_decref+0x6 [c:\build27\cpython\modules\gcmodule.c @ 360] 01 00000000`04bfd280 00000000`777dcf08 python27!subtype_traverse+0x78 [c:\build27\cpython\objects\typeobject.c @ 845] 02 00000000`04bfd2d0 00000000`777de2a0 python27!collect+0x1e8 [c:\build27\cpython\modules\gcmodule.c @ 925] 03 00000000`04bfd370 00000000`778a1ab8 python27!_PyObject_GC_Malloc+0x120 [c:\build27\cpython\modules\gcmodule.c @ 1512] 04 00000000`04bfd3a0 00000000`778ee438 python27!PyTuple_New+0x158 [c:\build27\cpython\objects\tupleobject.c @ 90] 05 00000000`04bfd3d0 00000000`778edef9 python27!load_args+0x18 [c:\build27\cpython\python\ceval.c @ 4521] 06 00000000`04bfd400 00000000`778eb49b python27!call_function+0x279 [c:\build27\cpython\python\ceval.c @ 4352] 07 00000000`04bfd460 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 08 00000000`04bfd570 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 09 00000000`04bfd620 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 0a 00000000`04bfd6a0 00000000`77799d33 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 0b 00000000`04bfd6d0 00000000`77842d23 python27!partial_call+0x73 [c:\build27\cpython\modules\_functoolsmodule.c @ 198] 0c 00000000`04bfd700 00000000`778ee5ab python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 0d 00000000`04bfd730 00000000`778ee045 python27!do_call+0x11b [c:\build27\cpython\python\ceval.c @ 4569] 0e 00000000`04bfd770 00000000`778eb49b python27!call_function+0x3c5 [c:\build27\cpython\python\ceval.c @ 4374] 0f 00000000`04bfd7d0 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 10 00000000`04bfd8e0 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 11 00000000`04bfd990 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 12 00000000`04bfda10 00000000`778575d9 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 13 00000000`04bfda40 00000000`77842d23 python27!instancemethod_call+0x219 [c:\build27\cpython\objects\classobject.c @ 2603] 14 00000000`04bfdcc0 00000000`778ee5ab python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 15 00000000`04bfdcf0 00000000`778ee045 python27!do_call+0x11b [c:\build27\cpython\python\ceval.c @ 4569] 16 00000000`04bfdd30 00000000`778eb49b python27!call_function+0x3c5 [c:\build27\cpython\python\ceval.c @ 4374] 17 00000000`04bfdd90 00000000`778ee178 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 18 00000000`04bfdea0 00000000`778ee02f python27!fast_function+0xc8 [c:\build27\cpython\python\ceval.c @ 4438] 19 00000000`04bfdf10 00000000`778eb49b python27!call_function+0x3af [c:\build27\cpython\python\ceval.c @ 4372] 1a 00000000`04bfdf70 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 1b 00000000`04bfe080 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 1c 00000000`04bfe130 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 1d 00000000`04bfe1b0 00000000`778575d9 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 1e 00000000`04bfe1e0 00000000`77842d23 python27!instancemethod_call+0x219 [c:\build27\cpython\objects\classobject.c @ 2603] 1f 00000000`04bfe460 00000000`778ee8eb python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 20 00000000`04bfe490 00000000`778eb573 python27!ext_do_call+0x2eb [c:\build27\cpython\python\ceval.c @ 4666] 21 00000000`04bfe4f0 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3af3 [c:\build27\cpython\python\ceval.c @ 3031] 22 00000000`04bfe600 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 23 00000000`04bfe6b0 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 24 00000000`04bfe730 00000000`778575d9 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 25 00000000`04bfe760 00000000`77842d23 python27!instancemethod_call+0x219 [c:\build27\cpython\objects\classobject.c @ 2603] 26 00000000`04bfe9e0 00000000`778b0390 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 27 00000000`04bfea10 00000000`778a4d76 python27!slot_tp_init+0xd0 [c:\build27\cpython\objects\typeobject.c @ 5807] 28 00000000`04bfea40 00000000`77842d23 python27!type_call+0xd6 [c:\build27\cpython\objects\typeobject.c @ 765] 29 00000000`04bfea70 00000000`778ee5ab python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 2a 00000000`04bfeaa0 00000000`778ee045 python27!do_call+0x11b [c:\build27\cpython\python\ceval.c @ 4569] 2b 00000000`04bfeae0 00000000`778eb49b python27!call_function+0x3c5 [c:\build27\cpython\python\ceval.c @ 4374] 2c 00000000`04bfeb40 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 2d 00000000`04bfec50 00000000`778ee1e9 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 2e 00000000`04bfed00 00000000`778ee02f python27!fast_function+0x139 [c:\build27\cpython\python\ceval.c @ 4451] 2f 00000000`04bfed70 00000000`778eb49b python27!call_function+0x3af [c:\build27\cpython\python\ceval.c @ 4372] 30 00000000`04bfedd0 00000000`7787773c python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 31 00000000`04bfeee0 00000000`778ede8d python27!gen_send_ex+0x12c [c:\build27\cpython\objects\genobject.c @ 86] 32 00000000`04bfef20 00000000`778eb49b python27!call_function+0x20d [c:\build27\cpython\python\ceval.c @ 4340] 33 00000000`04bfef80 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 34 00000000`04bff090 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 35 00000000`04bff140 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 36 00000000`04bff1c0 00000000`778ee8eb python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 37 00000000`04bff1f0 00000000`778eb573 python27!ext_do_call+0x2eb [c:\build27\cpython\python\ceval.c @ 4666] 38 00000000`04bff250 00000000`778ee178 python27!PyEval_EvalFrameEx+0x3af3 [c:\build27\cpython\python\ceval.c @ 3031] 39 00000000`04bff360 00000000`778ee02f python27!fast_function+0xc8 [c:\build27\cpython\python\ceval.c @ 4438] 3a 00000000`04bff3d0 00000000`778eb49b python27!call_function+0x3af [c:\build27\cpython\python\ceval.c @ 4372] 3b 00000000`04bff430 00000000`778ee178 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 3c 00000000`04bff540 00000000`778ee02f python27!fast_function+0xc8 [c:\build27\cpython\python\ceval.c @ 4438] 3d 00000000`04bff5b0 00000000`778eb49b python27!call_function+0x3af [c:\build27\cpython\python\ceval.c @ 4372] 3e 00000000`04bff610 00000000`778eca11 python27!PyEval_EvalFrameEx+0x3a1b [c:\build27\cpython\python\ceval.c @ 2993] 3f 00000000`04bff720 00000000`77877038 python27!PyEval_EvalCodeEx+0x911 [c:\build27\cpython\python\ceval.c @ 3584] 40 00000000`04bff7d0 00000000`77842d23 python27!function_call+0x178 [c:\build27\cpython\objects\funcobject.c @ 528] 41 00000000`04bff850 00000000`778575d9 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 42 00000000`04bff880 00000000`77842d23 python27!instancemethod_call+0x219 [c:\build27\cpython\objects\classobject.c @ 2603] 43 00000000`04bffb00 00000000`778edb41 python27!PyObject_Call+0x83 [c:\build27\cpython\objects\abstract.c @ 2548] 44 00000000`04bffb30 00000000`7780cb1e python27!PyEval_CallObjectWithKeywords+0x141 [c:\build27\cpython\python\ceval.c @ 4222] 45 00000000`04bffb60 00000000`77931405 python27!t_bootstrap+0x9e [c:\build27\cpython\modules\threadmodule.c @ 621] 46 00000000`04bffb90 00000000`77c72fdf python27!bootstrap+0x35 [c:\build27\cpython\python\thread_nt.h @ 124] 47 00000000`04bffbc0 00000000`77c73080 MSVCR90!_callthreadstartex+0x17 [f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c @ 348] 48 00000000`04bffbf0 00007ff9`6ebe8364 MSVCR90!_threadstartex+0x84 [f:\dd\vctools\crt_bld\self_64_amd64\crt\src\threadex.c @ 326] 49 00000000`04bffc20 00007ff9`6f1570d1 KERNEL32!BaseThreadInitThunk+0x14 4a 00000000`04bffc50 00000000`00000000 ntdll!RtlUserThreadStart+0x21
static int
visit_decref(PyObject *op, void *data)
{
assert(op != NULL);
if (PyObject_IS_GC(op)) { <<--- HERE
PyGC_Head *gc = AS_GC(op);
/* We're only interested in gc_refs for objects in the
* generation being collected, which can be recognized
* because only they have positive gc_refs.
*/
assert(gc->gc.gc_refs != 0); /* else refcount was too small */
if (gc->gc.gc_refs > 0)
gc->gc.gc_refs--;
}
return 0;
}
0:005> dv op op = 0x00000000`77a9a6c0 0:005> dx -r1 (*((python27!_object *)0x77a9a6c0)) (*((python27!_object *)0x77a9a6c0)) [Type: _object] [+0x000] ob_refcnt : 61836288 [Type: __int64] [+0x008] ob_type : 0x3ae6378 [Type: _typeobject *] 0:005> dx -r1 (*((python27!_typeobject *)0x3ae6378)) (*((python27!_typeobject *)0x3ae6378)) [Type: _typeobject] [+0x000] ob_refcnt : 2007606976 [Type: __int64] [+0x008] ob_type : 0x3a28588 [Type: _typeobject *] [+0x010] ob_size : 1 [Type: __int64] [+0x018] tp_name : 0x1 : "--- memory read error at address 0x00000000`00000001 ---" [Type: char *] [+0x020] tp_basicsize : 2007389472 [Type: __int64] [+0x028] tp_itemsize : 1 [Type: __int64] [+0x030] tp_dealloc : 0x2f85b60 [Type: void (__cdecl*)(_object *)] [+0x038] tp_print : 0x3b03250 [Type: int (__cdecl*)(_object *,_iobuf *,int)] [+0x040] tp_getattr : 0x3aec8b0 [Type: _object * (__cdecl*)(_object *,char *)] [+0x048] tp_setattr : 0x1 [Type: int (__cdecl*)(_object *,char *,_object *)] [+0x050] tp_compare : 0x1 [Type: int (__cdecl*)(_object *,_object *)] [+0x058] tp_repr : 0x37c4fe8 [Type: _object * (__cdecl*)(_object *)] [+0x060] tp_as_number : 0x3b03268 [Type: PyNumberMethods *] [+0x068] tp_as_sequence : 0x0 [Type: PySequenceMethods *] [+0x070] tp_as_mapping : 0x3b9a650 [Type: PyMappingMethods *] [+0x078] tp_hash : 0x3ace060 [Type: long (__cdecl*)(_object *)] [+0x080] tp_call : 0x1 [Type: _object * (__cdecl*)(_object *,_object *,_object *)] [+0x088] tp_str : 0x1 [Type: _object * (__cdecl*)(_object *)] [+0x090] tp_getattro : 0x77a65520 [Type: _object * (__cdecl*)(_object *,_object *)] [+0x098] tp_setattro : 0x1 [Type: int (__cdecl*)(_object *,_object *,_object *)] [+0x0a0] tp_as_buffer : 0x3ace078 [Type: PyBufferProcs *] [+0x0a8] tp_flags : 61798576 [Type: long] [+0x0b0] tp_doc : 0x3ab19b0 : " d???" [Type: char *] [+0x0b8] tp_traverse : 0x1 [Type: int (__cdecl*)(_object *,int (__cdecl*)(_object *,void *),void *)] [+0x0c0] tp_clear : 0x1 [Type: int (__cdecl*)(_object *)] [+0x0c8] tp_richcompare : 0x38001f8 [Type: _object * (__cdecl*)(_object *,_object *,int)] [+0x0d0] tp_weaklistoffset : 61798600 [Type: __int64] [+0x0d8] tp_iter : 0x0 [Type: _object * (__cdecl*)(_object *)] [+0x0e0] tp_iternext : 0x3aecbe0 [Type: _object * (__cdecl*)(_object *)] [+0x0e8] tp_methods : 0x3ab12f0 [Type: PyMethodDef *] [+0x0f0] tp_members : 0x1 [Type: PyMemberDef *] [+0x0f8] tp_getset : 0x1 [Type: PyGetSetDef *] [+0x100] tp_base : 0x38001f8 [Type: _typeobject *] [+0x108] tp_dict : 0x3aecbf8 [Type: _object *] [+0x110] tp_descr_get : 0x0 [Type: _object * (__cdecl*)(_object *,_object *,_object *)] [+0x118] tp_descr_set : 0x3b03030 [Type: int (__cdecl*)(_object *,_object *,_object *)] [+0x120] tp_dictoffset : 61740688 [Type: __int64] [+0x128] tp_init : 0x1 [Type: int (__cdecl*)(_object *,_object *,_object *)] [+0x130] tp_alloc : 0x1 [Type: _object * (__cdecl*)(_typeobject *,__int64)] [+0x138] tp_new : 0x37c4fe8 [Type: _object * (__cdecl*)(_typeobject *,_object *,_object *)] [+0x140] tp_free : 0x3b03048 [Type: void (__cdecl*)(void *)] [+0x148] tp_is_gc : 0x0 [Type: int (__cdecl*)(_object *)] [+0x150] tp_bases : 0x3af9030 [Type: _object *] [+0x158] tp_mro : 0x3ab3458 [Type: _object *] [+0x160] tp_cache : 0x0 [Type: _object *] [+0x168] tp_subclasses : 0x1 [Type: _object *] [+0x170] tp_weaklist : 0x37ff6e8 [Type: _object *] [+0x178] tp_del : 0x3af9048 [Type: void (__cdecl*)(_object *)] [+0x180] tp_version_tag : 0x0 [Type: unsigned int]
gc log:
gc: collecting generation 0... gc: objects in each generation: 657 2285 9844 gc: done, 0.0020s elapsed. gc: collecting generation 0... gc: objects in each generation: 594 2861 9843 gc: done, 0.0000s elapsed. gc: collecting generation 0... gc: objects in each generation: 672 3413 9843 gc: collectable <Callbacks 0000000003A82208> gc: collectable <dict 0000000003A856A8> gc: collectable <dict 0000000003A85598> gc: collectable <cell 0000000003A2EC78> gc: collectable <cell 0000000003A2EBE8> gc: collectable <tuple 0000000003A7E1C8> gc: collectable <function 0000000003A7F6D8> gc: collectable <instancemethod 0000000003A23090> gc: collectable <Callbacks 0000000003A822B0> gc: collectable <dict 0000000003A8CAE8> gc: collectable <dict 0000000003A8C378> gc: collectable <cell 0000000003A8F0D8> gc: collectable <cell 0000000003A8F078> gc: collectable <tuple 00000000039FD588> gc: collectable <function 0000000003A7F668> gc: collectable <instancemethod 00000000032453A8> gc: collectable <Callbacks 0000000003A82828> gc: collectable <dict 0000000003A94E18> gc: collectable <dict 0000000003A94AE8> gc: collectable <cell 0000000003A8F138> gc: collectable <cell 0000000003A8F258> gc: collectable <tuple 0000000003A7E148> gc: collectable <function 0000000003A7FCF8> gc: collectable <instancemethod 0000000003A35F78> gc: collectable <Callbacks 0000000003A827F0> gc: collectable <dict 0000000003A95598> gc: collectable <dict 0000000003A95158> gc: collectable <cell 0000000003A8F588> gc: collectable <cell 0000000003A8F7C8> gc: collectable <tuple 00000000039FD3C8> gc: collectable <function 0000000003A7F978> gc: collectable <instancemethod 0000000003A93798> gc: collectable <Callbacks 0000000003A82550> gc: collectable <dict 0000000003A977B8> gc: collectable <dict 0000000003A94048> gc: collectable <cell 0000000003A8FC48> gc: collectable <cell 0000000003A8FC78> gc: collectable <tuple 0000000003A981C8> gc: collectable <function 0000000003A8E048> gc: collectable <instancemethod 0000000003A35C60> gc: collectable <Callbacks 0000000003A82630> gc: collectable <dict 0000000003A9C9D8> gc: collectable <dict 0000000003A958C8> gc: collectable <cell 0000000003A9D108> gc: collectable <cell 0000000003A9D138> gc: collectable <tuple 0000000003A90A88> gc: collectable <function 0000000003A8E358> gc: collectable <instancemethod 0000000003A93FC0> gc: done, 48 unreachable, 0 uncollectable, 0.0280s elapsed. gc: collecting generation 0... gc: objects in each generation: 655 3971 9843 gc: collectable <Callbacks 0000000003A822B0> gc: collectable <dict 0000000003AA09D8> gc: collectable <dict 0000000003A95158> gc: collectable <cell 0000000003A8FC78> gc: collectable <cell 0000000003A8F0D8> gc: collectable <tuple 00000000039FD3C8> gc: collectable <function 0000000003A7F668> gc: collectable <instancemethod 0000000003A9A8B8> gc: collectable <Callbacks 0000000003A82A58> gc: collectable <dict 0000000003AA3488> gc: collectable <dict 0000000003A85598> gc: collectable <cell 0000000003A9DC18> gc: collectable <cell 0000000003A9DC48> gc: collectable <tuple 0000000003A9FF88> gc: collectable <function 0000000003A7FCF8> gc: collectable <instancemethod 0000000003A9A240> gc: collectable <Callbacks 0000000003A827F0> gc: collectable <dict 0000000003AA3AE8> gc: collectable <dict 0000000003A958C8> gc: collectable <cell 0000000003AA8048> gc: collectable <cell 0000000003AA8078> gc: collectable <tuple 0000000003A98748> gc: collectable <function 0000000003A8EF98> gc: collectable <instancemethod 0000000003AA20D8> gc: collectable <Callbacks 0000000003A82DA0> gc: collectable <dict 0000000003AB2488> gc: collectable <dict 0000000003AAFAE8> gc: collectable <cell 0000000003AA8498> gc: collectable <cell 0000000003AA84F8> gc: collectable <tuple 0000000003AACEC8> gc: collectable <function 0000000003AA92E8> gc: collectable <instancemethod 0000000003AA2DC8> gc: collectable <Callbacks 0000000003AA7F60> gc: collectable <dict 0000000003AB2048> gc: collectable <dict 0000000003AAF378> gc: collectable <cell 0000000003AA8588> gc: collectable <cell 0000000003AA8558> gc: collectable <tuple 0000000003AACD88> gc: collectable <function 0000000003AA9668> gc: collectable <instancemethod 0000000003AB4090> gc: done, 40 unreachable, 0 uncollectable, 0.0280s elapsed. gc: collecting generation 1... gc: objects in each generation: 874 4496 9843 gc: collectable <Callbacks 0000000003A82D68> gc: collectable <dict 0000000003A81158> gc: collectable <cell 0000000003A9D5B8> gc: collectable <dict 0000000003AA07B8> gc: collectable <instancemethod 0000000003A93FC0> gc: collectable <Callbacks 0000000003AA7B70> gc: collectable <dict 0000000003AAEE18> gc: collectable <instancemethod 0000000003AB49D8> gc: collectable <function 0000000003A7F978> gc: collectable <dict 0000000003AB6048> gc: collectable <function 0000000003AA9748> gc: collectable <tuple 0000000003A90A88> gc: collectable <tuple 0000000003AAC4C8> gc: collectable <cell 0000000003A9D678> gc: collectable <cell 0000000003AA8D08> gc: collectable <cell 0000000003AA8CD8> gc: collectable <Callbacks 0000000003A827F0> gc: collectable <dict 0000000003AB6268> gc: collectable <dict 0000000003AB2268> gc: collectable <cell 0000000003A8F0D8> gc: collectable <cell 0000000003AA8A68> gc: collectable <tuple 0000000003AACEC8> gc: collectable <function 0000000003A7FCF8> gc: collectable <instancemethod 0000000003AA2F78> gc: collectable <Callbacks 0000000003AA7940> gc: collectable <dict 0000000003AB69D8> gc: collectable <dict 0000000003AB6598> gc: collectable <cell 0000000003AA8DC8> gc: collectable <cell 0000000003AA8078> gc: collectable <tuple 0000000003AACC48> gc: collectable <function 0000000003A8EF98> gc: collectable <instancemethod 0000000003ACD0D8> gc: collectable <Callbacks 0000000003AA7780> gc: collectable <dict 0000000003AD1048> gc: collectable <dict 0000000003A958C8> gc: collectable <cell 0000000003ACE168> gc: collectable <cell 0000000003ACE468> gc: collectable <tuple 0000000003A90D08> gc: collectable <function 0000000003AA9F98> gc: collectable <instancemethod 0000000003ACD750> gc: collectable <Callbacks 0000000003AA7588> gc: collectable <dict 0000000003AD16A8> gc: collectable <dict 0000000003AD1268> gc: collectable <cell 0000000003ACE888> gc: collectable <cell 0000000003ACE258> gc: collectable <tuple 0000000003AA4508> gc: collectable <function 0000000003AD0588> gc: collectable <instancemethod 0000000003ACDCA8> gc: collectable <Callbacks 0000000003AB30F0> gc: collectable <dict 0000000003AD1E18> gc: collectable <dict 0000000003AABBF8> gc: collectable <cell 0000000003ACE588> gc: collectable <cell 0000000003ACE9D8> gc: collectable <tuple 0000000003AB12C8> gc: collectable <function 0000000003AA9F28> gc: collectable <instancemethod 0000000003ACD948> gc: collectable <Callbacks 0000000003AA7C18> gc: collectable <dict 0000000003AD4488> gc: collectable <dict 0000000003AABE18> gc: collectable <cell 0000000003ACED08> gc: collectable <cell 0000000003AD70A8> gc: collectable <tuple 0000000003AD6108> gc: collectable <function 0000000003AD0898> gc: collectable <instancemethod 0000000003AD3798> gc: done, 64 unreachable, 0 uncollectable, 0.0640s elapsed. gc: collecting generation 0... gc: objects in each generation: 839 0 14971 gc: collectable <Callbacks 0000000003AB3908> gc: collectable <dict 0000000003ADB598> gc: collectable <dict 0000000003ADB158> gc: collectable <cell 0000000003AD7978> gc: collectable <cell 0000000003AD79A8> gc: collectable <tuple 0000000003ACFDC8> gc: collectable <function 0000000003A7FCF8> gc: collectable <instancemethod 0000000003AD9510> gc: collectable <Callbacks 0000000003AB3940> gc: collectable <dict 0000000003ADBAE8> gc: collectable <dict 0000000003AAD378> gc: collectable <cell 0000000003AD7AF8> gc: collectable <cell 0000000003AD7D68> gc: collectable <tuple 0000000003AD6908> gc: collectable <function 0000000003ADD5F8> gc: collectable <instancemethod 0000000003AD9630> gc: collectable <Callbacks 0000000003AB3BA8> gc: collectable <dict 0000000003AE1268> gc: collectable <dict 0000000003ADBD08> gc: collectable <cell 0000000003AD7E28> gc: collectable <cell 0000000003AD7EB8> gc: collectable <tuple 0000000003ADF488> gc: collectable <function 0000000003A7F978> gc: collectable <instancemethod 0000000003AE3048> gc: collectable <Callbacks 0000000003AB3F98> gc: collectable <dict 0000000003AE5268> gc: collectable <dict 0000000003AE1E18> gc: collectable <cell 0000000003AE2288> gc: collectable <cell 0000000003AE22B8> gc: collectable <tuple 0000000003ACFA88> gc: collectable <function 0000000003ADD978> gc: collectable <instancemethod 0000000003AE3510> gc: done, 32 unreachable, 0 uncollectable, 0.0160s elapsed. gc: collecting generation 0... gc: objects in each generation: 824 701 14909 gc: collectable <Callbacks 0000000003AE6908> gc: collectable <dict 0000000003AF1378> gc: collectable <dict 0000000003AEFE18> gc: collectable <cell 0000000003AE2F78> gc: collectable <cell 0000000003AE2FA8> gc: collectable <tuple 0000000003ACF588> gc: collectable <function 0000000003AE9438> gc: collectable <instancemethod 0000000003AEB360> gc: collectable <Callbacks 0000000003AE6CF8> gc: collectable <dict 0000000003AF4488> gc: collectable <dict 0000000003AF1BF8> gc: collectable <cell 0000000003AF2078> gc: collectable <cell 0000000003AF2438> gc: collectable <tuple 0000000003AF0208> gc: collectable <function 0000000003AE9518> gc: collectable <instancemethod 0000000003AEB990> gc: collectable <Callbacks 0000000003AE6F60> gc: collectable <dict 0000000003AF77B8> gc: collectable <dict 0000000003AF4E18> gc: collectable <cell 0000000003AF2858> gc: collectable <cell 0000000003AF24C8> gc: collectable <tuple 0000000003AF0BC8> gc: collectable <function 0000000003AE9AC8> gc: collectable <instancemethod 0000000003AEBE58> gc: collectable <Callbacks 0000000003AF8160> gc: collectable <dict 0000000003AF96A8> gc: collectable <dict 0000000003AF9598> gc: collectable <cell 0000000003AF2558> gc: collectable <cell 0000000003AF2BE8> gc: collectable <tuple 0000000003AEA508> gc: collectable <function 0000000003AE97B8> gc: collectable <instancemethod 0000000003AEBB88> gc: done, 32 unreachable, 0 uncollectable, 0.0180s elapsed. gc: collecting generation 0... gc: objects in each generation: 1371 916 14774
From this point I can't understand how to debug the situation. Maybe somebody will help me with possible misuse of pywin32/IOCP which may lead to such behavior? There are not much information about that in documentation.
Functions are used: WSASend, WSARecv, AcceptEx, ConnectEx, AllocateReadBuffer, GetAcceptExSockaddrs, CalculateSocketEndPointSize
It's quite easy to misuse these functions and cause Python to crash, but without a sample it's difficult to guess what the issue might be. You might like to resend your question to the python-win32 mailing list. You need to be subscribed to the list before you can post to it - see http://mail.python.org/mailman/listinfo/python-win32 for subscription options.
If the outcome of that is a clearly identifiable bug in pywin32, I'd be happy for a new bug with those details to be opened.