[GitHub] wkcn opened a new issue #8569: The conflict between MXNet and OpenCV

[GitBox <gi...@apache.org>]

wkcn opened a new issue #8569: The conflict between MXNet and OpenCV
URL: https://github.com/apache/incubator-mxnet/issues/8569
 
 
   Hi, there.
   
   I found the reason of the conflict between MXNet and OpenCV.
   
   ## Environment info
   Operation System: Arch Linux 4.13.6
   MXNet: 3f37577 (Date:   Tue Nov 7 02:13:07 2017 +0800)
   OpenCV: 3.3.1
   Python: 2.7.14/3.6.3
   GCC: 6.3.1 20170109
   Build config: `make -j $(nproc) USE_OPENCV=1 USE_BLAS=openblas`
   
   ## Steps to reproduce
   1. I built the MXNet core shared library with `make -j $(nproc) USE_OPENCV=1 USE_BLAS=openblas`
   `make/config.mk` is default.
   The building was successful. 
   2. Then I was going to install the MXNet Python binding.
   ```bash
   	cd python
   	sudo python setup.py install
   ```
   
   It showed the error that:
   
   `*** Error in python': free(): invalid pointer:0x000055ec46fe1520 *** `
   
   ## What I have tried to solve it
   I deleted all `"import cv2"` in `$(MXNET_PATH)/python/mxnet/{recordio.py, image/{detection.py, image.py}}`
   
   Then I made two tests in the folder `$(MXNET_PATH)/python/`.
   
   ```bash
   ?  python git:(master) ? python 
   Python 3.6.3 (default, Oct 24 2017, 14:48:20) 
   [GCC 7.2.0] on linux
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import mxnet
   >>> import cv2
   *** Error in `python': free(): invalid pointer: 0x0000564c7470d520 ***
   [1]    116917 abort (core dumped)  python
   
   ?  python git:(master) ? python
   Python 3.6.3 (default, Oct 24 2017, 14:48:20) 
   [GCC 7.2.0] on linux
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import cv2
   >>> import mxnet
   [src/tcmalloc.cc:283] Attempt to free invalid pointer 0x5568689f8fc0 
   [1]    116946 abort (core dumped)  python
   ```
   
   `src/tcmalloc.cc` is the code of **gperftools**.
   So I think there is a conflict between `gperftools` and `opencv2`.
   
   I set `USE_GPERFTOOLS = 0` and `USE_JEMALLOC = 0` in `$(MXNET_PATH)/make/config.mk`, and rebuild MXNet.
   The problem is solved.
   

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