Signal tripped flags need memory barriers

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-08-04.08:36:33.764>
labels = ['type-bug', '3.7']
title = 'Signal tripped flags need memory barriers'
updated_at = <Date 2017-08-06.15:08:09.695>
user = 'https://github.com/njsmith'

bugs.python.org fields:

activity = <Date 2017-08-06.15:08:09.695>
actor = 'pitrou'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2017-08-04.08:36:33.764>
creator = 'njs'
dependencies = []
files = []
hgrepos = []
issue_num = 31119
keywords = []
message_count = 7.0
messages = ['299736', '299756', '299760', '299761', '299795', '299796', '299802']
nosy_count = 4.0
nosy_names = ['arigo', 'pitrou', 'vstinner', 'njs']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31119'
versions = ['Python 3.7']