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It seems thatctypes doesn't like having function pointers on aCDLL modified concurrently. Here's a reproducer (for Linux):
importctypesfromthreadingimportThreaddll=ctypes.CDLL("libc.so.6")defmain():for_inrange(100):dll.puts.argtypes=ctypes.c_char_p,dll.puts.restype=ctypes.c_intthreads= [Thread(target=main)for_inrange(100)]forthreadinthreads:thread.start()