/usr/lib/python2.7/dist-packages/xdist/mypickle.py is in python-pytest-xdist 1.4-1.1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/python2.7/dist-packages/xdist/../../../../share/pyshared/xdist/mypickle.py