Race conditions in Tkinter with non-threaded Tcl

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BPO	33257
Nosy	@terryjreedy, @roseman, @serhiy-storchaka, @native-api
PRs	python/cpython#6444 python/cpython#6972 python/cpython#6990
Files	TkinterCrash2-2.py: Py2 version, crashing TkinterCrash3-2-2.py: Py3 version, working TkinterHanders.py TkinterHanders3.py 0001-Build-non-threaded-debug-Tcl.zip: For testing only! Build master (win64) with nonthreaded debug Tcl 0001-build-2.7-with-threaded-Tcl.patch: For testing only! Build 2.7 (win64) with threaded Tcl test_threads_tk.py: reproduce hang when creating multiple Tk's

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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']

Start with the supplied reproducers TkinterCrash2-2.py, TkinterCrash3-2-2.py, and test_threads_tk.py, then read TkinterHanders.py and TkinterHanders3.py. Review existing pull requests 6444, 6972, and 6990 before making changes. The issue is in patch review, so completion requires resolving the reported races and validating the reproduction cases.

Written by the indexing model from the issue text.

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