A problem about multi-threading and IO

General Usage
, ,
1

I’m trying write a code as

make_random_string(n::Int)::String  =   (prod ∘ map)(Char, rand(65:90, n))

function outer_string(n::Int)::Tuple{String, String}
    orig_str    =   make_random_string(n)
    result_io   =   IOBuffer()

    run(pipeline(`echo $orig_str`; stdout=result_io))
    result_str  =   (String ∘ take!)(result_io)

    return  orig_str, result_str[begin:end-1]
end

function main()
    n_list  =   rand(10:100, 100)
    pushfirst!(n_list, 10^6)

    Threads.@threads for n ∈ n_list
    # for n ∈ n_list
        orig_str, rslt_str  =   outer_string(n)
        if orig_str !=  rslt_str
            @show n, orig_str, rslt_str
        end
    end
end

main()

Then, run julia -t 8 main.jl, it shows that

(n, orig_str, rslt_str) = (47, "WQRHRDILRKIVDDKOYNQWBUBBZJCCCMIGJPOEFASLMRPGQTN", "")
(n, orig_str, rslt_str) = (80, "AMFSFDGKTTNNGNHYXSOKYKVTIAPIMSIJYALREWIIKOFPFIQXPIGHOFDYJFIHGKLDLGHFOHQMHVGGWTFU", "")
(n, orig_str, rslt_str) = (29, "OOHSVEQJSPSVTWIVHWKJASCRANMSK", "")
(n, orig_str, rslt_str) = (49, "DVQXHVZDKCGCOAJGCDMZDISLMGBISLTJGLCNUUWTXSHHCQKYH", "")
(n, orig_str, rslt_str) = (59, "OSPSJJESVNZQVMHPCQHKOUNBTRIMTPUSNFNDCBPTGOVETBCKIRHGVLDFPFP", "")
(n, orig_str, rslt_str) = (45, "JHCWOYROYBOYYDDUOXZGXAKNFVFPZDCQMRBPNXMUAFKND", "")
(n, orig_str, rslt_str) = (23, "EAUVYYGFTJHHZLLQREEIZDZ", "")

Actually, julia main.jl returns no logs.
It seems that there are some broken running.
Why and how to correct the codes?