do not follow symlinks in getxattr, close mp_pool first
multiprocessing.Pool.close() ensures no new tasks can be submitted to the pool and waits for them to all finish. Even though AsyncResult.get() also waits for the tasks to finish, and our code structure shouldnt submit new tasks at that point, close() first, get() then. In the future this could be error-prone in the future where mp_tasks is modified while results are being merged back and we miss some results because the iterator wont take these new items into account *during* iteration.
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