itertools.tee not thread-safe; can segfault interpreter when wrapped iterator releases GIL #78591

assignee = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2021-07-27.07:17:31.839>
created_at = <Date 2018-08-15.02:08:28.419>
labels = ['3.8', '3.7', 'library', '3.9', 'type-crash']
title = 'itertools.tee not thread-safe; can segfault interpreter when wrapped iterator releases GIL'
updated_at = <Date 2021-07-27.07:17:31.838>
user = 'https://bugs.python.org/carlorosati'

activity = <Date 2021-07-27.07:17:31.838>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2021-07-27.07:17:31.839>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2018-08-15.02:08:28.419>
creator = 'carlorosati'
dependencies = []
files = ['47750']
hgrepos = []
issue_num = 34410
keywords = ['patch']
message_count = 31.0
messages = ['323546', '323587', '323588', '323592', '323593', '323613', '323632', '323633', '323817', '323828', '323858', '323881', '323917', '324146', '324237', '324658', '324839', '350165', '350174', '350705', '350750', '350754', '350907', '351014', '351360', '351370', '351371', '351381', '375640', '398264', '398282']
nosy_count = 10.0
nosy_names = ['rhettinger', 'serhiy.storchaka', 'josh.r', 'davin', 'xiang.zhang', 'hongweipeng', 'miss-islington', 'xtreak', 'carlorosati', 'iritkatriel']
pr_nums = ['9075', '9254', '15567', '15625', '15736', '15737', '15738', '15740']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue34410'
versions = ['Python 2.7', 'Python 3.7', 'Python 3.8', 'Python 3.9']