Hi Dears, I am currently using pypy(pypy-7.0.0-linux_x86_64-portable) and I am facing some issues using it. I installed pip, cython and numpy using commands: $ ./pypy-xxx/bin/pypy -m ensurepip $ ./pypy-xxx/bin/pip install cython numpy After that, I installed one package *"pysubnettree" *thorough pypy's pip. While importing SubnetTree class, I get segmentation fault. It works completely file with python2.7. *test.py:* import SubnetTree Here are some logs that I collected using pypy's falthandler tool. ======================================================================================== Fatal Python error: Segmentation fault Stack (most recent call first, approximate line numbers): File "/root/pypy_7/pypy-7.0.0-linux_x86_64-portable/site-packages/SubnetTree.py", line 13 in swig_import_helper File "/root/pypy_7/pypy-7.0.0-linux_x86_64-portable/site-packages/SubnetTree.py", line 11 in <module> File "test.py", line 1 in <module> File "<builtin>/app_main.py", line 767 in run_it File "<builtin>/app_main.py", line 78 in run_toplevel File "<builtin>/app_main.py", line 568 in run_command_line File "<builtin>/app_main.py", line 848 in entry_point Segmentation fault ========================================================================================= I tried to debug it further, it seems like segfault is observed while loading *(.so)* file using python's inbuild module *imp.load_module('_SubnetTree', fp, pathname, description).* It would be a great help if you can throw some light on this. Thanks and Regards, Nabil