Process hangs when running on batch

Hey,
I'm running my code on aws batch and after finishing code similar to below, it hangs.

 with Pool(processes=6) as pool:
    pool.starmap(self.some_function,[[...] for ind,x in enumerate(list)])

When running it on my computer, there is no problem.
it seems that the configurations on my machine and on batch are the same.
Is there a known problem about running multiple processes on ecs?