Repro for python gh-129748

129748.py

import threading
import time

x = "abc"

end = threading.Event()

def alloc():
    global x
    while not end.is_set():
        x = str(id(x))

def read():
    global x
    while not end.is_set():
        hash(x)

t1 = threading.Thread(target=alloc)
t2 = threading.Thread(target=read)

t1.start()
t2.start()

time.sleep(0.1)
end.set()

t2.join()
t1.join()