Description
This is happening when running the full test suite (numpy.test('full', verbose=3)) for NumPy v1.11.0 in win64 pydebug version.
It hangs right after printing Test two arrays with different shapes are found not equal. ..., which means it is probably on test_utils.py. When the tests there are run isolated, it does not crash (crashes only when running the full test suite).
I've managed to attach a debugger, and this is the detailed call stack inside multiarray_d.pyd:
multiarray_d.pyd!PyDataMem_FREE(void * ptr=0x00000000120034f0) Line 214 C
multiarray_d.pyd!_npy_free_cache(void * p=0x00000000120034f0, unsigned __int64 nelem=0, unsigned int msz=1024, cache_bucket * cache=0x000007fee1bf7280, void (void *) * dealloc=0x000007fee1941540) Line 60 C
multiarray_d.pyd!npy_free_cache(void * p=0x00000000120034f0, unsigned __int64 sz=0) Line 95 C
> multiarray_d.pyd!array_dealloc(tagPyArrayObject * self=0x00000000126fa0c0) Line 428 C
python27_d.dll!_Py_Dealloc(_object * op=0x00000000126fa0c0) Line 2263 C
python27_d.dll!frame_dealloc(_frame * f=0x0000000004dc63d8) Line 460 C
python27_d.dll!_Py_Dealloc(_object * op=0x0000000004dc63d8) Line 2263 C
python27_d.dll!PyEval_EvalCodeEx(PyCodeObject * co=0x0000000002714b98, _object * globals=0x0000000000000002, _object * locals=0x0000000000000002, _object * * args=0x0000000000000000, int argcount=2, _object * * kws=0x0000000003a38118, int kwcount=0, _object * * defs=0x0000000000000000, int defcount=0, _object * closure=0x0000000000000000) Line 3594 C
It seems to be a "HEAP CORRUPTION DETECTED" error.
Here is what is happening in detail:
npy_free_cache(fa->data, PyArray_NBYTES(self)); being called for array with refcount == 0, and nbytes == 0.
Inside _npy_free_cache, nelem == 0, cache[nelem].available == 7 == NCACHE, so it arrives at dealloc(p), which is trying to free a probably already freed pointer.
Here is fa:
0x00000000126fa0c0 {_ob_next=0x0000000000000000 <NULL> _ob_prev=0x0000000000000000 <NULL> ob_refcnt=...}
_ob_next: 0x0000000000000000 <NULL>
_ob_prev: 0x0000000000000000 <NULL>
ob_refcnt: 0
ob_type: 0x000007fee1b70f60 {multiarray_d.pyd!_typeobject PyArray_Type} {_ob_next=0x000000000254a698 {_ob_next=...} ...}
data: 0x00000000120034f0 ""
nd: 1
dimensions: 0x0000000013ccd250 {0}
strides: 0x0000000013ccd258 {4}
base: 0x0000000000000000 <NULL>
descr: 0x000007fee1b77720 {multiarray_d.pyd!_PyArray_Descr LONG_Descr} {_ob_next=0x0000000000000000 <NULL> ...}
flags: 1287
weakreflist: 0x0000000000000000 <NULL>
fa->descr:
fa->descr
0x000007fee1b77720 {multiarray_d.pyd!_PyArray_Descr LONG_Descr} {_ob_next=0x0000000000000000 <NULL> ...}
_ob_next: 0x0000000000000000 <NULL>
_ob_prev: 0x0000000000000000 <NULL>
ob_refcnt: 1043
ob_type: 0x000007fee1b91fa0 {multiarray_d.pyd!_typeobject PyArrayDescr_Type} {_ob_next=0x00000000025670d8 {_ob_next=...} ...}
typeobj: 0x000007fee1bf3b40 {multiarray_d.pyd!_typeobject PyLongArrType_Type} {_ob_next=0x0000000002556fa8 {_ob_next=...} ...}
kind: 105 'i'
type: 108 'l'
byteorder: 61 '='
flags: 0 '\0'
type_num: 7
elsize: 4
alignment: 4
subarray: 0x0000000000000000 <NULL>
fields: 0x000000001e3cd2d8 {python27_d.dll!_object _Py_NoneStruct} {_ob_next=0x0000000001e31cf8 {_ob_next=0x0000000001e32040 {...} ...} ...}
names: 0x0000000000000000 <NULL>
f: 0x000007fee1b775a0 {multiarray_d.pyd!PyArray_ArrFuncs _PyLong_ArrFuncs} {cast=0x000007fee1b775a0 {0x000007fee195a620 {multiarray_d.pyd!LONG_to_BOOL(void *, void *, __int64, void *, void *)}, ...} ...}
metadata: 0x0000000000000000 <NULL>
c_metadata: 0x0000000000000000 <NULL>
hash: -1299418611
[0]: 0x00000004
[1]: 0x00000000
[2]: 0x00342731
[3]: 0xfdfdfdfd
[4]: 0x00000000 <-- fa->data points here
[5]: 0x00000000
[6]: 0x0133e83a
[7]: 0x88000047
[8]: 0x04ca6990
[9]: 0x00000000
[10]: 0x132c2db0
[11]: 0x00000000
[12]: 0x00000000
[13]: 0x00000000
[14]: 0x00000000
[15]: 0x00000001
[16]: 0x00000004
[17]: 0x00000000
[18]: 0x00339900
[19]: 0xfdfdfdfd
[20]: 0x00000001
[21]: 0xfdfdfdfd
[22]: 0x0133e826