Deadlocks in concurrent.futures.ProcessPoolExecutor with pickling error #75880

assignee = None
closed_at = <Date 2018-01-05.12:33:10.791>
created_at = <Date 2017-10-05.07:41:45.845>
labels = ['3.7', 'type-bug', 'library']
title = 'Deadlocks in `concurrent.futures.ProcessPoolExecutor` with pickling error'
updated_at = <Date 2018-01-05.12:33:10.789>
user = 'https://github.com/tomMoral'

activity = <Date 2018-01-05.12:33:10.789>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2018-01-05.12:33:10.791>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2017-10-05.07:41:45.845>
creator = 'tomMoral'
dependencies = []
files = []
hgrepos = []
issue_num = 31699
keywords = ['patch']
message_count = 3.0
messages = ['303745', '309497', '309504']
nosy_count = 2.0
nosy_names = ['pitrou', 'tomMoral']
pr_nums = ['3895', '4256']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31699'
versions = ['Python 3.7']