Segmentation fault when using memory allocation tracker #4834
Description
I use Python 2.7.6, numpy 1.8.1 and cython 0.20.2 under Red Hat 6.5. I tried out the code in numpy/tools/allocation_tracking, that is, I installed the extension (alloc_hook) and then copied track_allocations.py into my own code and used it according to the example in the main block. But the moment I allocate a numpy array I get a segmentation fault. In case it is related, here is the extension compile output:
(p27)-bash-4.1$ python setup.py install
running install
running build
running build_ext
cythoning alloc_hook.pyx to alloc_hook.c
warning: alloc_hook.pyx:30:18: Non-trivial type declarators in shared declaration (e.g. mix of pointers and values). Each pointer declaration should be on its own line.
warning: alloc_hook.pyx:30:29: Non-trivial type declarators in shared declaration (e.g. mix of pointers and values). Each pointer declaration should be on its own line.
building 'alloc_hook' extension
creating build
creating build/temp.linux-x86_64-2.7
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/opt/Python2.7/lib/python2.7/site-packages/numpy/core/include -I/opt/Python2.7/include/python2.7 -c alloc_hook.c -o build/temp.linux-x86_64-2.7/alloc_hook.o
In file included from /opt/Python2.7/lib/python2.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1761,
from /opt/Python2.7/lib/python2.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:17,
from /opt/Python2.7/lib/python2.7/site-packages/numpy/core/include/numpy/arrayobject.h:4,
from alloc_hook.c:352:
/opt/Python2.7/lib/python2.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION"
/opt/Python2.7/lib/python2.7/site-packages/numpy/core/include/numpy/__ufunc_api.h:241: warning: ‘_import_umath’ defined but not used
creating build/lib.linux-x86_64-2.7
gcc -pthread -shared build/temp.linux-x86_64-2.7/alloc_hook.o -L/opt/Python2.7/lib -lpython2.7 -o build/lib.linux-x86_64-2.7/alloc_hook.so
running install_lib
copying build/lib.linux-x86_64-2.7/alloc_hook.so -> ...