/usr/lib/pypy/dist-packages/zmq/backend/ is in pypy-zmq 16.0.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/pypy/dist-packages/zmq/backend/__init__.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/
/usr/lib/pypy/dist-packages/zmq/backend/cffi/__init__.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/_cdefs.h
/usr/lib/pypy/dist-packages/zmq/backend/cffi/_cffi.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/_cffi_ext.pypy-41-x86_64-linux-gnu.so
/usr/lib/pypy/dist-packages/zmq/backend/cffi/_poll.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/_verify.c
/usr/lib/pypy/dist-packages/zmq/backend/cffi/constants.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/context.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/devices.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/error.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/message.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/socket.py
/usr/lib/pypy/dist-packages/zmq/backend/cffi/utils.py
/usr/lib/pypy/dist-packages/zmq/backend/select.py