[subinterpreters] inittab_copy not set to NULL after free, can lead to crashes when running multiple interpreters in a single process

[indygreg]

BPO	40412
Nosy	@indygreg, @miss-islington
PRs	bpo-40412: Nullify inittab_copy during finalization #19746 [3.8] bpo-40412: Nullify inittab_copy during finalization (GH-19746) #19841 [3.7] bpo-40412: Nullify inittab_copy during finalization (GH-19746) #19842

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-06-18.19:05:46.542>
created_at = <Date 2020-04-28.00:51:49.945>
labels = ['expert-subinterpreters', 'expert-C-API', '3.8', '3.9', 'type-crash']
title = '[subinterpreters] inittab_copy not set to NULL after free, can lead to crashes when running multiple interpreters in a single process'
updated_at = <Date 2021-06-18.19:05:46.541>
user = 'https://github.com/indygreg'

bugs.python.org fields:

activity = <Date 2021-06-18.19:05:46.541>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-06-18.19:05:46.542>
closer = 'iritkatriel'
components = ['C API', 'Subinterpreters']
creation = <Date 2020-04-28.00:51:49.945>
creator = 'indygreg'
dependencies = []
files = []
hgrepos = []
issue_num = 40412
keywords = ['patch']
message_count = 3.0
messages = ['367477', '367869', '367895']
nosy_count = 2.0
nosy_names = ['indygreg', 'miss-islington']
pr_nums = ['19746', '19841', '19842']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue40412'
versions = ['Python 3.8', 'Python 3.9']

[indygreg]

Filing a bug to placate the requirement that pull requests have issues.

[miss-islington]

New changeset 64224a4 by Gregory Szorc in branch 'master':
bpo-40412: Nullify inittab_copy during finalization (GH-19746)
64224a4

[miss-islington]

New changeset 1205afb by Miss Islington (bot) in branch '3.8':
bpo-40412: Nullify inittab_copy during finalization (GH-19746)
1205afb