recursive function with std::async stuck from some size of std::vector

I rewrite function who get all combination of vector. I tried to run it asynchronously, when the vector size is 5 - getAllCombinationOfVector({ 1,2,3,4,5}) it work fine. when the vector size is 6 it stuck. When the input is 6 the code never reach to the end of any function.

#include <thread>
#include <future>
#include <iostream>
#include <chrono>

std::vector<std::vector<int>> getAllCombinationOfVector(const std::vector<int> vec)
{
    return internalGetAllCombinationOfVector(vec, std::vector<int>());
}

std::vector<std::vector<int>> internalGetAllCombinationOfVector(const std::vector<int> remainIds, const std::vector<int> firstPart)
{
    std::vector<std::vector<int>> options;
    std::vector<int> newPart = firstPart;
    if (remainIds.size() == 1)
    {
        newPart.push_back(remainIds[0]);
        return std::vector<std::vector<int>>{newPart};
    }   
    std::vector<std::future<std::vector<std::vector<int>>>> tasks;
    for (auto itr=remainIds.begin();itr!=remainIds.end();itr++)
    {
        newPart = firstPart;
        newPart.push_back(*itr);
        

        std::vector<int> remainIdWithoutUsedId = std::vector<int>(remainIds.begin(),itr);
        remainIdWithoutUsedId.insert(remainIdWithoutUsedId.end(),itr + 1, remainIds.end());
        
        
        tasks.push_back(std::async(std::launch::async, internalGetAllCombinationOfVector, remainIdWithoutUsedId, newPart));
    }
    for (auto& task : tasks)
    {
        auto someOptions = task.get();
        options.insert(options.end(), someOptions.begin(), someOptions.end());
    }
    return options;

}

when the function run synchronously it work. What can be the problem?