Segmentation fault

[Shadow_exe]

There is an error, which I can not solve, because I can't 
understand why it happens.
If it's not an error, correct me please!

Code:
module main;
import core.thread;
import std.stdio;
import core.memory;

class DerivedThread : Thread {
    this(uint index){
        this._index = index;
        super( &run );
    }

    private uint _index;


    private {
        void run(){
                writeln("run ", _index);
                uint[] test11;
                for(uint y=0; y<1e6; ++y){
                    test11 ~= y;
                }
                writeln("done ", _index);
        }
    }
}

void main(string[] argv)
{
    for(uint i=0; i<10; ++i){
        (new DerivedThread(i)).start();
    }
}

compil:
dmd ./main.d -debug -profile -w -v -g -cov -gs
// version   v2.060

Compiles without a single warning, well, that's understandable, 
code there simple...
But when I run! Sometimes displays like this:
./main
run 3
run 1
run 0
run 2
run 4
run 5
run 6
run 7
run 8
run 9
done 0
done 8
done 3
done 1
done 2
done 4
done 6
done 5
done 7
done 9
// And everything is fine!
But sometimes:
./main
Segmentation fault
Or is it:
./main
run 0
Segmentation fault

If You after the launch of You have worked without errors, 
pozapuskayte several times.
What am I doing wrong? Help.