Hello, I am new to opencv and I have ran on an error i cant seem to fin a solution for in the forums so far. I use this guide (http://www.pyimagesearch.com/2016/10/24/ubuntu-16-04-how-to-install-opencv/) to install opencv in a virtualenv running python3.5 and i m getting a strange error when a script is exiting. (I first noticed it when i used exit() running python on the command line after import cv2.) The full error is as follows :
*** Error in `python': free(): invalid pointer: 0x00000000016de060 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f292b8cb7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7f292b8d437a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7f292b8d853c]
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9(_ZN6google8protobuf8internal28DestroyDefaultRepeatedFieldsEv+0x1f)[0x7f291b9848af]
/usr/lib/x86_64-linux-gnu/libprotobuf.so.9(_ZN6google8protobuf23ShutdownProtobufLibraryEv+0x8b)[0x7f291b983b3b]
/usr/lib/x86_64-linux-gnu/libmirprotobuf.so.3(+0x233b9)[0x7f2909cc03b9]
/lib64/ld-linux-x86-64.so.2(+0x10de7)[0x7f292be4bde7]
/lib/x86_64-linux-gnu/libc.so.6(+0x39ff8)[0x7f292b88dff8]
/lib/x86_64-linux-gnu/libc.so.6(+0x3a045)[0x7f292b88e045]
python[0x5feb5f]
python[0x5fec4a]
python(PyErr_PrintEx+0x36)[0x5fecb6]
python(PyRun_InteractiveOneObject+0x2ce)[0x4583ea]
python(PyRun_InteractiveLoopFlags+0xe8)[0x458576]
python[0x4585d0]
python[0x4cf26a]
python(main+0xe1)[0x4cfe41]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f292b874830]
python(_start+0x29)[0x5d5f29]
======= Memory map: ========
00400000-007a8000 r-xp 00000000 08:06 5786258 /home/youuu/.virtualenvs/CVNEW/bin/python3
009a8000-009aa000 r--p 003a8000 08:06 5786258 /home/youuu/.virtualenvs/CVNEW/bin/python3
009aa000-00a41000 rw-p 003aa000 08:06 5786258 /home/youuu/.virtualenvs/CVNEW/bin/python3
00a41000-00a72000 rw-p 00000000 00:00 0
0159b000-01bdf000 rw-p 00000000 00:00 0 [heap]
7f28e8000000-7f28e8021000 rw-p 00000000 00:00 0
7f28e8021000-7f28ec000000 ---p 00000000 00:00 0
7f28efca1000-7f28efe22000 rw-p 00000000 00:00 0
7f28efe22000-7f28efedb000 r-xp 00000000 08:06 6044080 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f28efedb000-7f28f00db000 ---p 000b9000 08:06 6044080 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f28f00db000-7f28f0100000 rw-p 000b9000 08:06 6044080 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/random/mtrand.cpython-35m-x86_64-linux-gnu.so
7f28f0100000-7f28f0142000 rw-p 00000000 00:00 0
7f28f0142000-7f28f014b000 r-xp 00000000 08:06 6043729 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/fft/fftpack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f014b000-7f28f034a000 ---p 00009000 08:06 6043729 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/fft/fftpack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f034a000-7f28f034b000 rw-p 00008000 08:06 6043729 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/fft/fftpack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f034b000-7f28f03cb000 rw-p 00000000 00:00 0
7f28f03cb000-7f28f03f4000 r-xp 00000000 08:06 6044061 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f28f03f4000-7f28f05f3000 ---p 00029000 08:06 6044061 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
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7f28f05f5000-7f28f05f8000 rw-p 000c6000 08:06 6044061 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/_umath_linalg.cpython-35m-x86_64-linux-gnu.so
7f28f05f8000-7f28f05fc000 r-xp 00000000 08:06 6044056 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f05fc000-7f28f07fc000 ---p 00004000 08:06 6044056 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f07fc000-7f28f07fd000 rw-p 00004000 08:06 6044056 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f07fd000-7f28f07ff000 rw-p 00019000 08:06 6044056 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/linalg/lapack_lite.cpython-35m-x86_64-linux-gnu.so
7f28f07ff000-7f28f083f000 rw-p 00000000 00:00 0
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7f28f0c58000-7f28f0c74000 r--p 00219000 08:05 922809 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0
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7f28f0e8a000-7f28f0eca000 rw-p 00000000 00:00 0
7f28f0eca000-7f28f0ed1000 r-xp 00000000 08:05 404289 /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f28f0ed1000-7f28f10d0000 ---p 00007000 08:05 404289 /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f28f10d0000-7f28f10d1000 r--p 00006000 08:05 404289 /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f28f10d1000-7f28f10d3000 rw-p 00007000 08:05 404289 /usr/lib/python3.5/lib-dynload/_lzma.cpython-35m-x86_64-linux-gnu.so
7f28f10d3000-7f28f10d7000 r-xp 00000000 08:05 404270 /usr/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
7f28f10d7000-7f28f12d6000 ---p 00004000 08:05 404270 /usr/lib/python3.5/lib-dynload/_bz2.cpython-35m-x86_64-linux-gnu.so
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7f28f78bf000-7f28f7a51000 r-xp 00000000 08:06 6043840 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/core/umath.cpython-35m-x86_64-linux-gnu.so
7f28f7a51000-7f28f7c50000 ---p 00192000 08:06 6043840 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/core/umath.cpython-35m-x86_64-linux-gnu.so
7f28f7c50000-7f28f7c56000 rw-p 00191000 08:06 6043840 /home/youuu/.virtualenvs/CVNEW/lib/python3.5/site-packages/numpy/core/umath.cpython-35m-x86_64-linux-gnu.so
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7f290705b000-7f290706c000 r-xp 00000000 08:05 393253 /usr/lib/x86_64-linux-gnu/libtasn1.so.6.5.1
7f290706c000-7f290726c000 ---p 00011000 08:05 393253 /usr/lib/x86_64-linux-gnu/libtasn1.so.6.5.1
7f290726c000-7f290726d000 r--p 00011000 08:05 393253 /usr/lib/x86_64-linux-gnu/libtasn1.so.6.5.1
7f290726d000-7f290726e000 rw-p 00012000 08:05 393253 /usr/lib/x86_64-linux-gnu/libtasn1.so.6.5.1
7f290726e000-7f290729f000 r-xp 00000000 08:05 405615 /usr/lib/x86_64-linux-gnu/libidn.so.11.6.15
7f290729f000-7f290749f000 ---p 00031000 08:05 405615 /usr/lib/x86_64-linux-gnu/libidn.so.11.6.15
7f290749f000-7f29074a0000 r--p 00031000 08:05 405615 /usr/lib/x86_64-linux-gnu/libidn.so.11.6.15
7f29074a0000-7f29074a1000 rw-p 00032000 08:05 405615 /usr/lib/x86_64-linux-gnu/libidn.so.11.6.15
7f29074a1000-7f29074fa000 r-xp 00000000 08:05 405850 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.1.0
7f29074fa000-7f29076f9000 ---p 00059000 08:05 405850 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.1.0
7f29076f9000-7f2907703000 r--p 00058000 08:05 405850 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.1.0
7f2907703000-7f2907705000 rw-p 00062000 08:05 405850 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.1.0
7f2907705000-7f29078b6000 r-xp 00000000 08:05 396469 /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f29078b6000-7f2907ab5000 ---p 001b1000 08:05 396469 /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f2907ab5000-7f2907abd000 r--p 001b0000 08:05 396469 /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f2907abd000-7f2907abf000 rw-p 001b8000 08:05 396469 /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.3
7f2907abf000-7f2907ac0000 rw-p 00000000 00:00 0
7f2907ac0000-7f2907b3f000 r-xp 00000000 08:05 405428 /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.0
7f2907b3f000-7f2907d3e000 ---p 0007f000 08:05 405428 /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.0
7f2907d3e000-7f2907d3f000 r--p 0007e000 08:05 405428 /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.0
7f2907d3f000-7f2907d40000 rw-p 0007f000 08:05 405428 /usr/lib/x86_64-linux-gnu/libgmp.so.10.3.0
7f2907d40000-7f2907d74000 r-xp 00000000 08:05 405787 /usr/lib/x86_64-linux-gnu/libnettle.so.6.2
7f2907d74000-7f2907f73000 ---p 00034000 08:05 405787 /usr/lib/x86_64-linux-gnu/libnettle.so.6.2
7f2907f73000-7f2907f75000 r--p 00033000 08:05 405787 /usr/lib/x86_64-linux-gnu/libnettle.so.6.2
7f2907f75000-7f2907f76000 rw-p 00035000 08:05 405787 /usr/lib/x86_64-linux-gnu/libnettle.so.6.2
7f2907f76000-7f2907fa8000 r-xp 00000000 08:05 405566 /usr/lib/x86_64-linux-gnu/libhogweed.so.4.2
7f2907fa8000-7f29081a7000 ---p 00032000 08:05 405566 /usr/lib/x86_64-linux-gnu/libhogweed.so.4.2
7f29081a7000-7f29081a8000 r--p 00031000 08:05 405566 /usr/lib/x86_64-linux-gnu/libhogweed.so.4.2
7f29081a8000-7f29081a9000 rw-p 00032000 08:05 405566 /usr/lib/x86_64-linux-gnu/libhogweed.so.4.2
7f29081a9000-7f29081f0000 r-xp 00000000 08:05 405485 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2
7f29081f0000-7f29083ef000 ---p 00047000 08:05 405485 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2
7f29083ef000-7f29083f1000 r--p 00046000 08:05 405485 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2
7f29083f1000-7f29083f3000 rw-p 00048000 08:05 405485 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2
7f29083f3000-7f29084cb000 r-xp 00000000 08:05 922996 /lib/x86_64-linux-gnu/libgcrypt.so.20.0.5
7f29084cb000-7f29086ca000 ---p 000d8000 08:05 922996 /lib/x86_64-linux-gnu/libgcrypt.so.20.0.5
7f29086ca000-7f29086cb000 r--p 000d7000 08:05 922996 /lib/x86_64-linux-gnu/libgcrypt.so.20.0.5
7f29086cb000-7f29086d3000 rw-p 000d8000 08:05 922996 /lib/x86_64-linux-gnu/libgcrypt.so.20.0.5
7f29086d3000-7f29086d4000 rw-p 00000000 00:00 0
7f29086d4000-7f290874f000 r-xp 00000000 08:05 405840 /usr/lib/x86_64-linux-gnu/liborc-0.4.so.0.25.0[1] 15109 abort (core dumped) python
PS: I had opencv installed in a python 2.7 enviroment and it worked flawlessly.