pdb on setuptools "ValueError: underlying buffer has been detached"

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-02-22.14:42:18.620>
labels = []
title = 'pdb on setuptools "ValueError: underlying buffer has been detached"'
updated_at = <Date 2019-02-22.14:42:18.620>
user = 'https://github.com/gerritholl'

bugs.python.org fields:

activity = <Date 2019-02-22.14:42:18.620>
actor = 'Gerrit.Holl'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2019-02-22.14:42:18.620>
creator = 'Gerrit.Holl'
dependencies = []
files = []
hgrepos = []
issue_num = 36079
keywords = []
message_count = 1.0
messages = ['336316']
nosy_count = 1.0
nosy_names = ['Gerrit.Holl']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue36079'
versions = ['Python 3.6']