mpi_gather,c中的2d动态数组,退出信号6(中止)

int malloc2dint(int ***array,int n,int m) 
{
    /* allocate the n*m contiguous items */
    int *p = (int *)malloc(n*m*sizeof(int));
    if (!p) return -1;

    /* allocate the row pointers into the memory */
    (*array) = (int **)malloc(n*sizeof(int*));
    if (!(*array)) 
    {
        free(p);
        return -1;
    }

    /* set up the pointers into the contiguous memory */
    int i;
    for (i=0; i<n; i++) 
        (*array)[i] = &(p[i*m]);

    return 0;
}

通过使用这种方法,我可以正确地广播和分散2d动态分配数组,但MPI_Gather中的问题仍然存在.
主要功能是：

int length = atoi(argv[1]);
int rank,size,from,to,i,j,k,**first_array,**second_array,**result_array;

MPI_Init (&argc,&argv);
MPI_Comm_rank(MPI_COMM_WORLD,&rank);
MPI_Comm_size(MPI_COMM_WORLD,&size);

//2D dynamic memory allocation
malloc2dint(&first_array,length,length);
malloc2dint(&second_array,length);
malloc2dint(&result_array,length);

//Related boundary to each task
from = rank * length/size;
to = (rank+1) * length/size;

//Intializing first and second array
if (rank==0) 
{
    for(i=0; i<length; i++)
        for(j=0; j<length; j++)
        {
            first_array[i][j] = 1;
            second_array[i][j] = 1;
        }
}

//Broadcast second array so all tasks will have it
MPI_Bcast (&(second_array[0][0]),length*length,MPI_INT,MPI_COMM_WORLD);

//Scatter first array so each task has matrix values between its boundary
MPI_Scatter (&(first_array[0][0]),length*(length/size),first_array[from],MPI_COMM_WORLD);


//Now each task will calculate matrix multiplication for its part
for (i=from; i<to; i++) 
    for (j=0; j<length; j++) 
    {
        result_array[i][j]=0;
        for (k=0; k<length; k++)
            result_array[i][j] += first_array[i][k]*second_array[k][j];

        //printf("nrank(%d)->result_array[%d][%d] = %dn",rank,result_array[i][j]);
        //this line print the correct value
    }

//Gathering info from all task and put each partition to resulat_array
MPI_Gather (&(result_array[from]),result_array,MPI_COMM_WORLD);

if (rank==0) 
{
    for (i=0; i<length; i++) 
    {
        printf("nt| ");
        for (j=0; j<length; j++)
            printf("%2d ",result_array[i][j]);
        printf("|n");
    }
}

MPI_Finalize();
return 0;

现在当我运行mpirun -np 2 xxx.out 4时输出为：

|  4  4  4  4 | ---> Good Job!

|  4  4  4  4 | ---> Good Job!

| 1919252078 1852795251 1868524912 778400882 | ---> Where are you baby?!!!

| 540700531 1701080693 1701734758 2037588068 | ---> Where are you baby?!!!

最后,mpirun注意到进程等级0退出信号6(中止).
对我而言,奇怪的一点是MPI_Bcast和MPI_Scatter正常工作但MPI_Gather没有.
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