Runtime finalization assumes all other threads have exited.

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-03-29.20:38:26.289>
labels = ['expert-subinterpreters', 'interpreter-core', 'type-bug', '3.8', '3.9']
title = 'Runtime finalization assumes all other threads have exited.'
updated_at = <Date 2020-06-03.16:42:03.692>
user = 'https://github.com/ericsnowcurrently'

bugs.python.org fields:

activity = <Date 2020-06-03.16:42:03.692>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core', 'Subinterpreters']
creation = <Date 2019-03-29.20:38:26.289>
creator = 'eric.snow'
dependencies = []
files = []
hgrepos = []
issue_num = 36476
keywords = []
message_count = 10.0
messages = ['339143', '339145', '358745', '358747', '358749', '358750', '358751', '358782', '359101', '359103']
nosy_count = 8.0
nosy_names = ['tim.peters', 'ncoghlan', 'pitrou', 'vstinner', 'eric.snow', 'pconnell', 'pablogsal', 'nanjekyejoannah']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36476'
versions = ['Python 3.8', 'Python 3.9']