Two consecutive import of numpy/cv2/scipy/matplotlib inside the pybind11 interpreter will fails. I suspect the original error might be either inside numpy or inside pybind11.
The following code will fail :
void call_python_interpreter() {
py::scoped_interpreter guard{};
py::exec("import numpy");
}
int main() {
call_python_interpreter();
std::cout << "Call 1 OK\n";
call_python_interpreter();
std::cout << "Call 2 OK\n";
}This was tested under various configurations : under various configurations :
- OSX / python 2.7.14 / 64 bits
- OSX / python 3.6.5 / 64 bits
- Linux / python 3.6.4 64 bits
- Windows / python 3.6.5 / 32 bits
See details below:
pybind11 version
commit 307ea6b7fdc77ae6d42ac71fef74ff6924498e58 (HEAD -> master, origin/master, origin/HEAD)
Author: David Caron <dcaron05@gmail.com>
Date: Tue Apr 24 10:16:18 2018 -0400
Typo
OSX / python 2.7.14 / 64 bits
(env) ➜ build git:(master) python --version
Python 2.7.14
(env) ➜ build git:(master) pip list | grep numpy
numpy 1.14.2
(env) ➜ build git:(master) ./test_np_pybind
Call 1 OK
[1] 27509 segmentation fault ./test_np_pybind
OSX / python 3.6.5 / 64 bits
(env3) ➜ build git:(master) python --version
Python 3.6.5
(env3) ➜ build git:(master) pip list | grep n
numpy 1.14.2
(env3) ➜ build git:(master) ./test_np_pybind
Call 1 OK
[1] 27723 segmentation fault ./test_np_pybind
Windows / python 3.6.5 / 32 bits
>PYTHON --version
Python 3.6.5 32 bits
Exception thrown at 0x5178C526 (multiarray.cp36-win32.pyd) in test_np_pybind.exe: 0xC0000005: Access violation writing location 0x0000000A. If there is a handler for this exception, the program may be safely continued.
Linux / python 3.6.4 64 bits
build git:(master) ✗ python --version
Python 3.6.4 :: Anaconda, Inc.
➜ build git:(master) ✗ pip list | grep numpy
numpy (1.14.2)
numpydoc (0.7.0)
➜ build git:(master) ✗ file test_np_pybind
test_np_pybind: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=b33f891a7db3e33322cd6099a1f01f952bbc0bd8, not stripped
➜ build git:(master) ✗ ./test_np_pybind
Call 1 OK
[1] 4187 segmentation fault ./test_np_pybind
A strace log is provided in the file strace.txt