*** stack smashing detected ***: terminated

[petr-sokolov]

Hello!

I found a strange action in the code

#include <xtensor/xtensor.hpp>
#include <xtensor/xadapt.hpp>
#include <xtensor-blas/xlinalg.hpp>
#include <xtensor/xarray.hpp>
#include <xtensor/xmanipulation.hpp>
#include <iostream>

int main()
{
    // good
    {
        auto a { xt::xarray<int>::from_shape({2}) };
        std::cout << a << std::endl;
        a = xt::expand_dims(a, 0);
        std::cout << a << std::endl;
    }

    // good
    {
        auto a { xt::xtensor<float, 1>::from_shape({2}) };
        std::cout << a << std::endl;
        xt::xarray<float> b { a };
        std::cout << b << std::endl;
        b = xt::expand_dims(b, 0);
        std::cout << b << std::endl;
        xt::xtensor<float, 2> c { b };
        std::cout << c << std::endl;
    }

    // *** stack smashing detected ***: terminated
    {
        auto a { xt::xtensor<float, 1>::from_shape({2}) };
        std::cout << a << std::endl;
        a = xt::expand_dims(a, 0);
        std::cout << a << std::endl;
    }
    return 0;
}

The code returned

{1431671258,          5}
{{1431671258,          5}}
{ 1.564086e-31,  3.060436e-41}
{ 1.564086e-31,  3.060436e-41}
{{ 1.564086e-31,  3.060436e-41}}
{{ 1.564086e-31,  3.060436e-41}}
{ 1.564078e-31,  3.060436e-41}
*** stack smashing detected ***: terminated
Aborted (core dumped)

the interrupt location is near std::copy in xtl/include/xtl/xsequence.hpp

...
    /***********************************
     * forward_sequence implementation *
     ***********************************/

    namespace detail
    {
        template <class R, class A, class E = void>
        struct sequence_forwarder_impl
        {
            template <class T>
            static inline R forward(const T& r)
            {
                R ret;
                std::copy(std::begin(r), std::end(r), std::begin(ret));
                return ret;
            }
        };
....