sub-process would be terminated when registered finalizers are still running

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-06-12.08:35:31.647>
labels = ['3.7', 'type-bug', 'library']
title = 'sub-process  would be terminated when registered finalizers are still running'
updated_at = <Date 2019-06-12.10:21:36.045>
user = 'https://github.com/mrqianjinsi'

bugs.python.org fields:

activity = <Date 2019-06-12.10:21:36.045>
actor = 'mrqianjinsi'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-06-12.08:35:31.647>
creator = 'mrqianjinsi'
dependencies = []
files = []
hgrepos = []
issue_num = 37242
keywords = []
message_count = 1.0
messages = ['345310']
nosy_count = 1.0
nosy_names = ['mrqianjinsi']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37242'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']