connectedComponentsWithStats produces a segfault in the latest release (4.5.5.62)

[Dobiasd]

The following minimal example finishes with exit code 139 (interrupted by signal 11: SIGSEGV):

import cv2
import numpy as np

img = np.zeros((240, 320, 1), np.uint8)

cv2.connectedComponentsWithStats(img, connectivity=4)
cv2.connectedComponentsWithStats(img, connectivity=4)

With the previous release of opencv-python (4.5.4.60) this worked fine.

Here is a Dockerfile to reproduce the crash:

FROM python:3.9.9

RUN apt-get update && apt-get install -y \
  libglib2.0-0 \
  libgl1-mesa-glx \
  build-essential \
  && rm -rf /var/lib/apt/lists/*

# With the old opencv-python==4.5.4.60 things are fine.
RUN pip install --no-cache-dir numpy==1.22.0 opencv-python==4.5.5.62

RUN echo "import cv2" > main.py
RUN echo "import numpy as np" >> main.py
RUN echo "img = np.zeros((240, 320, 1), np.uint8)" >> main.py
RUN echo "cv2.connectedComponentsWithStats(img, connectivity=4)" >> main.py
RUN echo "cv2.connectedComponentsWithStats(img, connectivity=4)" >> main.py

RUN python main.py

Result:

Segmentation fault (core dumped)

[Dobiasd]

I don't know if relevant, but when installing 4.5.4.60, pip prints:

Collecting opencv-python==4.5.4.60
  Downloading opencv_python-4.5.4.60-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (60.3 MB)

While when installing 4.5.5.62, it prints:

Collecting opencv-python==4.5.5.62
  Downloading opencv_python-4.5.5.62-cp36-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (60.4 MB)

(cp36-abi3 instead of cp39-cp39)

Maybe this is related to the problem.

[skvark]

Duplicate of #602 and opencv/opencv#21366.

Cannot be fixed here, the issue is in C++ code.

(cp36-abi3 instead of cp39-cp39)

That is expected due to recent changes. See https://www.python.org/dev/peps/pep-0384/ for more info.

[Dobiasd]

Ah, ok, thanks. 👍

[yanggyu17]

it works
opencv-python 4.5.4.60
thanks