Generating lockfiles fails with: unknown error (_ssl.c:3161) about pex HOT 3 CLOSED

import ssl
import sys
import threading


def create_ssl_context():
    return ssl.create_default_context()


SSL_CONTEXT = None


def store_ssl_context():
    global SSL_CONTEXT
    SSL_CONTEXT = create_ssl_context()


def get_ssl_context():
    global SSL_CONTEXT
    return SSL_CONTEXT


def main():
    args = sys.argv[1:]
    if args and args[0] == "--no-thread":
        print(create_ssl_context())
    else:
        thread = threading.Thread(target=store_ssl_context)
        thread.daemon = True
        thread.start()
        thread.join()
        print(get_ssl_context())


if __name__ == "__main__":
    sys.exit(main())