Memory corruption embedding python with OpenCV in a C++ already using OpenCV but different version

Question

I'm trying to embed python code in a C++ application. Problem is that if I use OpenCV functions in the C++ code and also in python function I am embedding there is memory corruption. Simply commenting all the opencv functions from the code below solve the problem. One thing is that my OpenCV for c++ is 4.5.0 (dinamically linked), compiled from source while version used in python is 3.1.0 (installed using the python wheel).

Looking at the backtrace (but I am not an expert on this) seems to me that resize function in python is somehow relying on the OpenCV 4.5.0 library to free memory, causing some sort of conflicts between the two version.. Python is version 3.5.2.

This is a minimal example.

My main cpp code:

#include <iostream>
#include <Python.h>
#include <opencv2/opencv.hpp>

using namespace std;


int main()
{

    cv::Mat test = cv::imread("/home/rocco/repo/cpp_python/current.jpg");
    cv::Mat test_res;
    cv::resize(test,test_res,cv::Size(),0.5,0.5);
    cv::imwrite("resized.jpg",test_res);
    std::string path = "/home/rocco/repo/cpp_python/current.jpg";
    std::string filename = "script";
    std::string function_name = "myfunction";

    std::string wkd = "/home/rocco/repo/cpp_python";

    auto script_name = PyUnicode_FromString(filename.c_str());
    Py_Initialize();

    PyObject *sys_path = PySys_GetObject("path");
    PyList_Insert(sys_path, 0, PyUnicode_FromString(wkd.c_str()));
    PySys_SetObject("path", sys_path);
    PyObject *pModule;
    pModule = PyImport_Import(script_name);

    auto pFunc = PyObject_GetAttrString(pModule, function_name.c_str());

    PyObject * pValue = NULL, * pArgs = NULL;
    pArgs = PyTuple_New(2);
    auto pFilename = PyUnicode_FromString(path.c_str());

    PyTuple_SetItem(pArgs, 0, pFilename);  

    pValue = PyObject_CallObject(pFunc, pArgs);

    Py_DECREF(pArgs);

    Py_DECREF(pFunc);
    Py_DECREF(pModule);
    Py_DECREF(pFilename);


    Py_Finalize();
    return 0;
}

My python script:

import cv2
 
def myfunction(filename):
    img = cv2.imread(filename, cv2.IMREAD_UNCHANGED)
    scale_percent = 0.5 # percent of original size
    img = cv2.resize(img, None, fx=scale_percent, fy=scale_percent)
    cv2.imwrite('resized2.jpg',img)


myfunction('current.jpg')

Backtrace provided here:

*** Error in `/home/rocco/repo/cpp_python/cpp_python': free(): invalid next size (fast): 0x0000000002447670 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777f5)[0x7f1a8c9807f5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8038a)[0x7f1a8c98938a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f1a8c98d58c]
/home/rocco/.local/lib/python3.5/site-packages/cv2/cv2.cpython-35m-x86_64-linux-gnu.so(+0x103b8c)[0x7f1a8639bb8c]
/home/rocco/dynamic_libraries/opencv_4-5/lib/libopencv_core.so.4.5(_ZN2cv3Mat10deallocateEv+0x100)[0x7f1a8d5aa140]
/home/rocco/.local/lib/python3.5/site-packages/cv2/cv2.cpython-35m-x86_64-linux-gnu.so(+0x114fe8)[0x7f1a863acfe8]
/home/rocco/.local/lib/python3.5/site-packages/cv2/cv2.cpython-35m-x86_64-linux-gnu.so(+0x1154d4)[0x7f1a863ad4d4]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyCFunction_Call+0xe9)[0x7f1a90686049]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x7555)[0x7f1a90792135]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x79d9)[0x7f1a907925b9]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(+0x24ac6c)[0x7f1a90822c6c]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalCodeEx+0x23)[0x7f1a90822d43]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalCode+0x1b)[0x7f1a9078a94b]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(+0x1bf5fd)[0x7f1a907975fd]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyCFunction_Call+0xc9)[0x7f1a90686029]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x8c0e)[0x7f1a907937ee]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(+0x24ac6c)[0x7f1a90822c6c]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x62d9)[0x7f1a90790eb9]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x79d9)[0x7f1a907925b9]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x79d9)[0x7f1a907925b9]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalFrameEx+0x79d9)[0x7f1a907925b9]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(+0x24ac6c)[0x7f1a90822c6c]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyEval_EvalCodeEx+0x23)[0x7f1a90822d43]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(+0xd2ac8)[0x7f1a906aaac8]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyObject_Call+0x6e)[0x7f1a9075f46e]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(_PyObject_CallMethodIdObjArgs+0x1bf)[0x7f1a9073d95f]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyImport_ImportModuleLevelObject+0x864)[0x7f1a907c98d4]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(+0x1be638)[0x7f1a90796638]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyCFunction_Call+0xe9)[0x7f1a90686049]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyObject_Call+0x6e)[0x7f1a9075f46e]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyObject_CallFunction+0xcf)[0x7f1a9075f5cf]
/usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0(PyImport_Import+0xe6)[0x7f1a907c9d66]
/home/rocco/repo/cpp_python/cpp_python[0x402291]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f1a8c929840]
/home/rocco/repo/cpp_python/cpp_python[0x401e89]
======= Memory map: ========
00400000-00407000 r-xp 00000000 08:04 9180205                            /home/rocco/repo/cpp_python/cpp_python
00606000-00607000 r--p 00006000 08:04 9180205                            /home/rocco/repo/cpp_python/cpp_python
00607000-00608000 rw-p 00007000 08:04 9180205                            /home/rocco/repo/cpp_python/cpp_python
01e0d000-0251f000 rw-p 00000000 00:00 0                                  [heap]
7f1a64000000-7f1a64021000 rw-p 00000000 00:00 0 
7f1a64021000-7f1a68000000 ---p 00000000 00:00 0 
7f1a690f0000-7f1a690f1000 rw-p 00000000 00:00 0 
7f1a690f1000-7f1a6a74d000 rw-p 00000000 00:00 0 
7f1a6a74d000-7f1a6beeb000 rw-p 00000000 00:00 0 
7f1a6beeb000-7f1a6bf7f000 r-xp 00000000 08:04 530555                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_generator.cpython-35m-x86_64-linux-gnu.so
7f1a6bf7f000-7f1a6c17f000 ---p 00094000 08:04 530555                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_generator.cpython-35m-x86_64-linux-gnu.so
7f1a6c17f000-7f1a6c1a3000 rw-p 00094000 08:04 530555                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_generator.cpython-35m-x86_64-linux-gnu.so
7f1a6c1a3000-7f1a6c1a5000 rw-p 00000000 00:00 0 
7f1a6c1a5000-7f1a6c1b0000 r-xp 00000000 08:04 530563                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_sfc64.cpython-35m-x86_64-linux-gnu.so
7f1a6c1b0000-7f1a6c3af000 ---p 0000b000 08:04 530563                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_sfc64.cpython-35m-x86_64-linux-gnu.so
7f1a6c3af000-7f1a6c3b1000 rw-p 0000a000 08:04 530563                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_sfc64.cpython-35m-x86_64-linux-gnu.so
7f1a6c3b1000-7f1a6c3bf000 r-xp 00000000 08:04 530561                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_pcg64.cpython-35m-x86_64-linux-gnu.so
7f1a6c3bf000-7f1a6c5bf000 ---p 0000e000 08:04 530561                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_pcg64.cpython-35m-x86_64-linux-gnu.so
7f1a6c5bf000-7f1a6c5c1000 rw-p 0000e000 08:04 530561                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_pcg64.cpython-35m-x86_64-linux-gnu.so
7f1a6c5c1000-7f1a6c5d2000 r-xp 00000000 08:04 530566                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_philox.cpython-35m-x86_64-linux-gnu.so
7f1a6c5d2000-7f1a6c7d1000 ---p 00011000 08:04 530566                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_philox.cpython-35m-x86_64-linux-gnu.so
7f1a6c7d1000-7f1a6c7d3000 rw-p 00010000 08:04 530566                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_philox.cpython-35m-x86_64-linux-gnu.so
7f1a6c7d3000-7f1a6c7d4000 rw-p 00000000 00:00 0 
7f1a6c7d4000-7f1a6c7eb000 r-xp 00000000 08:04 530559                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_mt19937.cpython-35m-x86_64-linux-gnu.so
7f1a6c7eb000-7f1a6c9eb000 ---p 00017000 08:04 530559                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_mt19937.cpython-35m-x86_64-linux-gnu.so
7f1a6c9eb000-7f1a6c9ed000 rw-p 00017000 08:04 530559                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_mt19937.cpython-35m-x86_64-linux-gnu.so
7f1a6c9ed000-7f1a6ca3b000 r-xp 00000000 08:04 530556                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_bounded_integers.cpython-35m-x86_64-linux-gnu.so
7f1a6ca3b000-7f1a6cc3b000 ---p 0004e000 08:04 530556                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_bounded_integers.cpython-35m-x86_64-linux-gnu.so
7f1a6cc3b000-7f1a6cc3d000 rw-p 0004e000 08:04 530556                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_bounded_integers.cpython-35m-x86_64-linux-gnu.so
7f1a6cc3d000-7f1a6ce58000 r-xp 00000000 08:04 9437776                    /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f1a6ce58000-7f1a6d057000 ---p 0021b000 08:04 9437776                    /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f1a6d057000-7f1a6d073000 r--p 0021a000 08:04 9437776                    /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f1a6d073000-7f1a6d07f000 rw-p 00236000 08:04 9437776                    /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
7f1a6d07f000-7f1a6d082000 rw-p 00000000 00:00 0 
7f1a6d082000-7f1a6d088000 r-xp 00000000 08:04 7086087                    /usr/lib/python3.5/lib-dynload/_hashlib.cpython-35m-x86_64-linux-gnu.so
7f1a6d088000-7f1a6d287000 ---p 00006000 08:04 7086087                    /usr/lib/python3.5/lib-dynload/_hashlib.cpython-35m-x86_64-linux-gnu.so
7f1a6d287000-7f1a6d288000 r--p 00005000 08:04 7086087                    /usr/lib/python3.5/lib-dynload/_hashlib.cpython-35m-x86_64-linux-gnu.so
7f1a6d288000-7f1a6d289000 rw-p 00006000 08:04 7086087                    /usr/lib/python3.5/lib-dynload/_hashlib.cpython-35m-x86_64-linux-gnu.so
7f1a6d289000-7f1a6d2b9000 r-xp 00000000 08:04 530568                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_common.cpython-35m-x86_64-linux-gnu.so
7f1a6d2b9000-7f1a6d4b8000 ---p 00030000 08:04 530568                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_common.cpython-35m-x86_64-linux-gnu.so
7f1a6d4b8000-7f1a6d4ba000 rw-p 0002f000 08:04 530568                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_common.cpython-35m-x86_64-linux-gnu.so
7f1a6d4ba000-7f1a6d4bb000 rw-p 00000000 00:00 0 
7f1a6d4bb000-7f1a6d4e0000 r-xp 00000000 08:04 530557                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_bit_generator.cpython-35m-x86_64-linux-gnu.so
7f1a6d4e0000-7f1a6d6e0000 ---p 00025000 08:04 530557                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_bit_generator.cpython-35m-x86_64-linux-gnu.so
7f1a6d6e0000-7f1a6d6e5000 rw-p 00025000 08:04 530557                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/_bit_generator.cpython-35m-x86_64-linux-gnu.so
7f1a6d6e5000-7f1a6d6e6000 rw-p 00000000 00:00 0 
7f1a6d6e6000-7f1a6d75e000 r-xp 00000000 08:04 530558                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f1a6d75e000-7f1a6d95d000 ---p 00078000 08:04 530558                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f1a6d95d000-7f1a6d983000 rw-p 00077000 08:04 530558                     /home/rocco/.local/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f1a6d983000-7f1a6d985000 rw-p 00000000 00:00 0 
7f1a6d985000-7f1a6d99b000 r-xp 00000000 08:04 529217                     /home/rocco/.local/lib/python3.5/site-packages/numpy/fft/_pocketfft_internal.cpython-35m-x86_64-linux-gnu.so
7f1a6d99b000-7f1a6db9a000 ---p 00016000 08:04 529217                     /home/rocco/.local/lib/python3.5/site-packages/numpy/fft/_pocketfft_internal.cpython-35m-x86_64-linux-gnu.so
7f1a6db9a000-7f1a6db9b000 rw-p 00015000 08:04 529217                     /home/rocco/.local/lib/python3.5/site-packages/numpy/fft/_pocketfft_internal.cpython-35m-x86_64-linux-gnu.so
7f1a6db9b000-7f1a6dbd2000 r-xp 00000000 08:04 6824744                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f1a6dbd2000-7f1a6ddd1000 ---p 00037000 08:04 6824744                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f1a6ddd1000-7f1a6ddd2000 r--p 00036000 08:04 6824744                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f1a6ddd2000-7f1a6ddd3000 rw-p 00037000 08:04 6824744                    /usr/lib/x86_64-linux-gnu/libmpdec.so.2.4.2
7f1a6ddd3000-7f1a6ddf7000 r-xp 00000000 08:04 7150229                    /usr/lib/python3.5/lib-dynload/_decimal.cpython-35m-x86_64-linux-gnu.so
7f1a6ddf7000-7f1a6dff6000 ---p 00024000 08:04 7150229                    /usr/lib/python3.5/lib-dynload/_decimal.cpython-35m-x86_64-linux-gnu.so
7f1a6dff6000-7f1a6dff7000 r--p 00023000 08:04 7150229                    /usr/lib/python3.5/lib-dynload/_decimal.cpython-35m-x86_64-linux-gnu.so
7f1a6dff7000-7f1a6e000000 rw-p 00024000 08:04 7150229                    /usr/lib/python3.5/lib-dynload/_decimal.cpython-35m-x86_64-linux-gnu.so
7f1a6e000000-7f1a70000000 rw-p 00000000 00:00 0 
7f1a70000000-7f1a70021000 rw-p 00000000 00:00 0 
7f1a70021000-7f1a74000000 ---p 00000000 00:00 0 
7f1a74000000-7f1a78000000 rw-p 00000000 00:00 0 
7f1a78000000-7f1a78021000 rw-p 00000000 00:00 0 
7f1a78021000-7f1a7c000000 ---p 00000000 00:00 0 
7f1a7c010000-7f1a7c190000 rw-p 00000000 00:00 0 
7f1a7c190000-7f1a7c197000 r-xp 00000000 08:04 7136401                    /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f1a7c197000-7f1a7c396000 ---p 00007000 08:04 7136401                    /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f1a7c396000-7f1a7c397000 r--p 00006000 08:04 7136401                    /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f1a7c397000-7f1a7c399000 rw-p 00007000 08:04 7136401                    /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f1a7c399000-7f1a7c3a8000 r-xp 00000000 08:04 9437491                    /lib/x86_64-linux-gnu/libbz2.so.1.0.4
7f1a7c3a8000-7f1a7c5a7000 ---p 0000f000 08:04 9437491                    /lib/x86_64-linux-gnu/libbz2.so.1.0.4
7f1a7c5a7000-7f1a7c5a8000 r--p 0000e000 08:04 9437491                    /lib/x86_64-linux-gnu/libbz2.so.1.0.4
7f1a7c5a8000-7f1a7c5a9000 rw-p 0000f000 08:04 9437491                    /lib/x86_64-linux-gnu/libbz2.so.1.0.4
7f1a7c5a9000-7f1a7c5ad000 r-xp 00000000 08:04 7136410                    /usr/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
7f1a7c5ad000-7f1a7c7ac000 ---p 00004000 08:04 7136410                    /usr/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
7f1a7c7ac000-7f1a7c7ad000 r--p 00003000 08:04 7136410                    /usr/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
7f1a7c7ad000-7f1a7c7ae000 rw-p 00004000 08:04 7136410                    /usr/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
7f1a7c7ae000-7f1a7c8ae000 rw-p 00000000 00:00 0 
7f1a7c8ae000-7f1a7c8d9000 r-xp 00000000 08:04 530149                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f1a7c8d9000-7f1a7cad9000 ---p 0002b000 08:04 530149                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f1a7cad9000-7f1a7cadb000 rw-p 0002b000 08:04 530149                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f1a7cadb000-7f1a7cade000 rw-p 000d4000 08:04 530149                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f1a7cade000-7f1a7cae2000 r-xp 00000000 08:04 530150                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f1a7cae2000-7f1a7cce2000 ---p 00004000 08:04 530150                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f1a7cce2000-7f1a7cce3000 rw-p 00004000 08:04 530150                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f1a7cce3000-7f1a7cce5000 rw-p 00019000 08:04 530150                     /home/rocco/.local/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f1a7cce5000-7f1a7cda5000 rw-p 00000000 00:00 0 
7f1a7cda5000-7f1a7cdc7000 r-xp 00000000 08:04 7136407                    /usr/lib/python3.5/lib-dynload/_ctypes.cpython-35m-x86_64-linux-gnu.so
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EDIT

After some test, I tried updating python to version 3.6.13 but problem persist, in addition I realized that the problem is not related to cv2.resize function but to opencv in general, whatever opencv function I call from python, it calls my dynamic linked opencv 4.5 libray for deallocation, causing the problem.

EDIT

Using OpenCV statically linked in C++ everything works as expected.. is there a reason for this?

Answer 1

It seems a linking problem.

Python uses "dlopen" to dynamically load libraries, try changing the flags that are passed to this function. For example, using RTLD_DEEPBIND you can specify to prefer the symbols contained by the loaded objects (instead of the global ones with the same name).

Using these two lines:

import os
print(os.RTLD_DEEPBIND | os.RTLD_NOW)

You can obtain the int code for these flags, which is 10.

Then you can change the flags used by dlopen by calling sys.setdlopenflags(10) :

void setFlags()
{
    auto flag = PyLong_FromLong(10);
    auto setdl = PySys_GetObject("setdlopenflags");

    auto arg = PyTuple_New(1);
    PyTuple_SetItem(arg, 0, flag);
    PyObject_CallObject(setdl, arg);
}

It must be used before PyImport_Import .

Answer 2

I think your problem is that python uses binding for c++ functions, and as you mention you are using different opencv versions for opencv c++ and python. Refer to https://docs.opencv.org/3.4/da/d49/tuy_bindings_basics.html for more information about python bindings. One solution will be to use already bonded functions or use the same compiled library version if you create your own bindings.