Problems sending data via MPI_Bcast - c

Question

I defined the point structure with MPI_Type_contiguous. After doing this, I initialize my type and subsequently I want to send the centroids and have them printed by the other processes which are different from the root process. I wrote this code, sending the centroids via MPI_Bcast but when I try to print the centroids inside the for loop it gives me a series of errors:
[rob: 10463] *** Process received signal ***
[rob: 10463] Signal: Segmentation fault (11)
[rob: 10463] Signal code: Address not mapped (1)
[rob: 10463] Failing at address: 0x1000
Primary job terminated normally, but 1 process returned
a non-zero exit code. For user-direction, the job has been aborted.
mpirun noticed that process rank 2 with PID 0 on node rob exited on signal 11 (Segmentation fault).
Where do I go wrong?
typedef struct {
double x;
double y;
} Point;
void initialize(Point *centroids, int num_clusters) {
int dex;
srand(time(NULL));
for (dex = 0; dex < num_clusters; dex++) {
centroids[dex].x = ((double) (rand() % 1000)) / 1000;
centroids[dex].y = ((double) (2 * rand() % 1000)) / 1000;
}
}
int main(int argc, char *argv[]) {
MPI_Init(&argc, &argv);
int rank, size;
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Comm_size(MPI_COMM_WORLD, &size);
MPI_Datatype POINT;
MPI_Type_contiguous(2, MPI_DOUBLE, &POINT);
MPI_Type_commit(&POINT);
int num_clusters = 0;
Point* centroids;
if (rank == 0) {
num_clusters = 2;
centroids = calloc(sizeof(Point), num_clusters);
initialize(centroids, num_clusters);
}
MPI_Bcast(centroids, 2, POINT, 0, MPI_COMM_WORLD);
if (rank != 0) {
for (int i = 0; i < num_clusters; i++) {
printf("Centroid X: %f\n", centroids[i].x);
printf("Centroid Y: %f\n", centroids[i].y);
}
}
MPI_Finalize();
return 0;
}