Python crashes on macOS after fork with no exec

BPO	33725
Nosy	@ronaldoussoren, @ned-deily
PRs	bpo-33725: skip test_multiprocessing_fork on macOS #11043 [3.7] bpo-33725: skip test_multiprocessing_fork on macOS (GH-11043) #11044 [3.6] bpo-33725: skip test_multiprocessing_fork on macOS (GH-11043) #11045 bpo-33725: multiprocessing uses spawn by default on macOS #13603 [3.7] bpo-33725: multiprocessing uses spawn by default on macOS (GH-13603) #13626 bpo-33725, multiprocessing doc: rephase warning against fork on macOS #13841 [3.8] bpo-33725, multiprocessing doc: rephase warning against fork on macOS (GH-13841) #13849

^{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 2020-05-29.18:09:22.220>
created_at = <Date 2018-06-01.00:53:06.418>
labels = ['OS-mac', '3.8', 'type-crash']
title = 'Python crashes on macOS after fork with no exec'
updated_at = <Date 2021-11-04.14:32:41.053>
user = 'https://github.com/kapilt'

bugs.python.org fields:

activity = <Date 2021-11-04.14:32:41.053>
actor = 'eryksun'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-29.18:09:22.220>
closer = 'barry'
components = ['macOS']
creation = <Date 2018-06-01.00:53:06.418>
creator = 'kapilt'
dependencies = []
files = []
hgrepos = []
issue_num = 33725
keywords = ['patch']
message_count = 70.0
messages = ['318352', '318361', '318396', '318397', '318528', '318529', '318708', '329871', '329880', '329885', '329919', '329922', '329923', '329926', '329927', '329933', '329941', '331101', '331406', '331407', '331409', '331411', '331435', '331438', '331459', '331610', '331733', '331735', '337587', '337591', '337733', '338819', '338873', '341452', '341455', '341475', '342042', '342071', '342412', '343704', '343773', '343779', '343782', '343807', '343826', '343828', '343830', '343832', '343833', '343838', '343841', '343842', '343844', '343895', '343898', '344590', '344608', '344710', '344762', '344763', '345841', '365249', '365251', '365252', '365262', '365263', '365266', '365281', '370296', '370331']
nosy_count = 2.0
nosy_names = ['ronaldoussoren', 'ned.deily']
pr_nums = ['11043', '11044', '11045', '13603', '13626', '13841', '13849']
priority = 'critical'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue33725'
versions = ['Python 3.8']