이거 값 입력하면 세그먼트 펄트 덤프에러뜨는데 어캄

[윌슨!!!!!..(dkburst)]

#include <stdio.h>

#include <stdlib.h>

#include <sys/ipc.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/shm.h>

#include <sys/wait.h>

#include <unistd.h>

void Collaz ( int * num ){

do{

printf("%d ",*num);

if((*num) %2 == 1) {

*num = 3*(*num) +1;

}else{

*num /= 2;

}

}while(*num != 1);

}

int main (){

// Shared Memory segment id

int segment_id;

// Shared Memory segment pointer

int * shared_memory;

// size

const int size =32;

// pid

int pid;

// allocate shared memory & attach

segment_id = shmget(IPC_PRIVATE, size, S_IRUSR | S_IWUSR);

shared_memory = (int *) shmat(segment_id,NULL,0);

scanf("%d",shared_memory);

pid = fork();

if (pid <0) {

fprintf(stderr,"Fork Failed");

return 1;

}else if(pid ==0){

printf("child\n");

Collaz(shared_memory);

}else{

wait(NULL);

printf("Child Complete");

}

}

존나좆같네