Processes during parsing remain in the background and are not terminated, thereby leading to a crash in the hosting\multiprocessing.pool system, what is the reason?

Question

Python

There is a site parser that receives the necessary information from a foreign site, the parser itself works correctly, but when introducing the multiprocessing function, the processes do not end on their own, what could be the reason?
Ready to answer questions about what he is responsible for.

def iaai(self):
        try:
            with Pool(40) as p:
                html = Links(self.car, self.from_year)
                links = html.parse_html()
                p.map(self.get_info_car, links)
        except Exception as e:
                exc_type, exc_obj, exc_tb = sys.exc_info()
                fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
                print("IAAI", exc_type, fname, exc_tb.tb_lineno)

I will be glad for any help.