Race conditions in Tkinter with non-threaded Tcl

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-04-10.16:41:09.432>
labels = ['3.8', '3.7', 'expert-tkinter', 'type-crash']
title = 'Race conditions in Tkinter with non-threaded Tcl'
updated_at = <Date 2018-10-27.23:10:44.251>
user = 'https://github.com/native-api'

bugs.python.org fields:

activity = <Date 2018-10-27.23:10:44.251>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tkinter']
creation = <Date 2018-04-10.16:41:09.432>
creator = 'Ivan.Pozdeev'
dependencies = []
files = ['47529', '47530', '47536', '47561', '47565', '47566', '47620']
hgrepos = []
issue_num = 33257
keywords = ['patch']
message_count = 29.0
messages = ['315172', '315271', '315283', '315285', '315286', '315304', '315878', '315899', '316087', '316089', '316092', '316093', '316095', '316096', '316097', '316098', '316099', '316100', '316103', '316105', '316106', '316241', '316265', '316418', '316451', '316689', '316921', '317875', '328662']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'markroseman', 'PythonInTheGrass', 'serhiy.storchaka', 'Ivan.Pozdeev']
pr_nums = ['6444', '6972', '6990']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue33257'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']