CUDA cudaMemcpu Segmentation fault when copying array of object pointers - c++

Question

I am trying to move an array of pointers to the device, where each pointer is pointing to a class object. However, I get a Segmentation fault at the line using cudaMemcpy. I am trying to follow the lines used in this post.
main.cu
#include "testclass.cuh"
#include <iostream>
__global__ void printtest(Test* test){
printf("HELLO FROM CUDA\n");
printf("CUDA1 : %i\n", test->hello);
Test test2(6);
printf("CUDA2 : %i\n", test2.hello);
printf("BYEEE FROM CUDA\n");
}
int main(){
printf("hello\n");
Test* test = new Test(512);
printf("CPU : %i\n", test->hello);
Test* devtest;
cudaMalloc(&devtest, sizeof(Test));
cudaError_t err = cudaMemcpy(devtest, test, sizeof(Test), cudaMemcpyHostToDevice);
if (err != cudaSuccess) {
fprintf(stderr, "Error %s at line %d in file %s\n",
cudaGetErrorString(err), __LINE__-3, __FILE__);
}
printtest<<<1, 1>>>(devtest);
cudaDeviceSynchronize();
printf("hello2\n");
Test** test3 = new Test*[2];
test3[0] = new Test(12299);
test3[1] = new Test(234923);
printf("CPU : %i\n", test3[0]->hello);
Test** devtest3;
cudaMalloc(&devtest3, 2*sizeof(Test*));
printf("CPU2\n");
err = cudaMemcpy(devtest3[0], test3[0], sizeof(Test), cudaMemcpyHostToDevice);
if (err != cudaSuccess) {
fprintf(stderr, "Error %s at line %d in file %s\n",
cudaGetErrorString(err), __LINE__-3, __FILE__);
}
printf("CPU3\n");
printtest<<<1, 1>>>(devtest3[0]);
cudaDeviceSynchronize();
}
testclass.cu
#include "testclass.cuh"
__host__ __device__ Test::Test(int in){
hello = in;
}
testclass.cuh
class Test {
public:
int hello;
__host__ __device__ Test(int);
};

Answer 1

Solved it using #molbdnilo 's comment.
main.cu
...
printf("hello2\n");
Test** test3 = new Test*[2];
test3[0] = new Test(12299);
test3[1] = new Test(234923);
printf("CPU : %i\n", test3[0]->hello);
Test* devtest3[2];
cudaMalloc(&devtest3[0], sizeof(Test));
printf("CPU2\n");
err = cudaMemcpy(devtest3[0], test3[0], sizeof(Test), cudaMemcpyHostToDevice);
if (err != cudaSuccess) {
fprintf(stderr, "Error %s at line %d in file %s\n",
cudaGetErrorString(err), __LINE__-3, __FILE__);
}
printf("CPU3\n");
printtest<<<1, 1>>>(devtest3[0]);
cudaDeviceSynchronize();
...