Introduced by PEP 475 – Retry system calls failing with EINTR in Python 3.5, system call wrappers provided in the standard library should be retried automatically when they fail with EINTR (InterruptedError).

Locate the places in code that have the retry handling as well.

• Check networking code
• errno.EINTR Is a good thing to grep for

We should be able to remove pymongo manual EINTR retry code once we drop support for Python 3.4.