C++ Random Number Generator was jamed?

I am fresh in C++, I met a problem about random number generation. I am actually doing simulation, for generating a Random Number, I create a function in a separated file: rng.h for example.

#include <random>//C++11
double rng(void){//uniform random generator. using MT19937;
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_real_distribution<double> dis(0,1);
    return dis(gen);
}

I called this function like this:

    #include <iostream>
    ...
    #include "rng.h"    
    int main(){
        for(int i=0;i<10000;i++){
            std::cout<<rng()<<std::endl;
        }
        func01();
        func02();
        func03();
        .....
        func99();
        return 0;
    }

In each funcXX(), rng() will be called as well. My code was compiled by g++ -std=c++11;

My Question is: after running for a while, CPU usage reach to 100%, and program was jamed.

I used gdb trace the problem, it showed:

^C
Program received signal SIGINT, Interrupt.
std::__detail::__mod<unsigned long, 4294967296ul, 1ul, 0ul> (__x=5223916446078556027)
    at /usr/include/c++/4.8/bits/random.h:150
150       { return _Mod<_Tp, __m, __a, __c>::__calc(__x); }

or

^C
Program received signal SIGINT, Interrupt.
0x00000000004204f8 in std::__detail::_Mod<unsigned long, 624ul, 1ul, 0ul, true, true>::__calc (__x=319)
    at /usr/include/c++/4.8/bits/random.h:142
142         __res %= __m;

or

^C
Program received signal SIGINT, Interrupt.
0x000000000040aae5 in std::mersenne_twister_engine<unsigned long, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>::seed (this=0x7fffffffb5d0, __sd=2650715069)
    at /usr/include/c++/4.8/bits/random.tcc:338
338       __x *= __f;

......

Issues seemed unstable....

More interesting is sometimes it went through.

How can I fix this, many thanks.....