Segmentation Fault core dump with a IF

I'm having this error but can't understand why. It's related to this portion of the code.

#include <stdio.h>
#include <stdlib.h>
#define x 'X'
#define o 'O'
void Linha()
{
    int i = 0;
    while(i++<8)
        printf("_");

    printf("\n");
}
void Coluna(char a[][3],int n)
{
    int i;

    for(i=0; i<=2; i++)
    {
        if(i!=2)
        printf("%c |", a[n][i]);
        else
        printf("%c", a[n][i]);


    }
    printf("\n");

}
void Most(char a[][3])
{
    int i = 0;
    Coluna(a,i++);
    Linha();
    Coluna(a,i++);
    Linha();
    Coluna(a,i);
}
int Cheio(char a[][3])
{
    int i = 0;
    int j = 0;
    int n = 0;
    for(i=0; i<3; i++)
    {
        for(j= 0; j<3; j++)
        {
            if(a[i][j] != ' ')
            {
                n++;
            }
        }
    }

    return n;

}
int LinhasV(char a[][3],char c)
{
    int i = 0;
    int j = 0;
    int n = 0;
    for(i=0; i<3; i++)
    {
        if(n==3)
            return n;
        n = 0;
        for(j= 0; j<3; j++)
        {
            if(a[i][j] == c)
            {
                n++;
            }
        }
    }

    return n;

}

int ColunasV(char a[][3],char c)
{
    int i = 0;
    int j = 0;
    int n = 0;
    for(j=0; i<3; j++)
    {
        if(n==3)
            return n;
        n = 0;
        for(i= 0; j<3; i++)
        {
            if(a[i][j] == c)
            {
                n++;
            }
        }
    }

    return n;
}


int DiagonalV(char a[][3], char c)
{
    int n = 0;

    if(a[0][0] == c && a[1][1] == c && a[2][2] == c)
    {
        return 1;}
    if(a[2][0] == c && a[1][1] == c && a[0][2] == c){

        return 1;}

    return 0;
}

int Owin(char a[][3])
{
    if(DiagonalV(a, o) && ColunasV(a, o) && LinhasV(a, o))
        return 1;
    return 0;
}
int Xwin(char a[][3])
{
    if(DiagonalV(a, x) && ColunasV(a, x) && LinhasV(a, x))
        return 1;
    return 0;
}
int livre(char a[][3],int x1, int x2)
{
    if(a[x1][x2] != ' ')
        return 0;
    return 1;
}
void Jogar(char a[][3],int x1, int x2)
{
    if(x1>=0 && x1<3 && x2>=0 && x2<3 && livre(a,x1,x2))
    {
        a[x1][x2] = x;
        return;

    }
    scanf("%d %d", &x1, &x2);
    Jogar(a, x1, x2);


}
int teste(int a)
{
    if(a>0)
        return 1;
    return 0;
}
int main()
{
    int x1,y1;
    char tab[3][3] = {{' ',' ',' '},{' ', ' ',' '},{' ', ' ',' '}};
    Most(tab);





    Most(tab);
    //printf("%d\n", Xwin(tab));
    //printf("\n\n X: DiagonalV:%d && ColunasV:%d && LinhasV:%d", DiagonalV(tab, x) , ColunasV(tab, x) , LinhasV(tab, x));

    while(1)
{
int xx = DiagonalV(tab, x);<-- (#define x 'X')
printf("%d", xx);
if(xx == 2)<--- Here's the error but why?
{
    break;
}
Jogar(tab, 99,99);

Most(tab);

}

    printf("xD\n");




    Jogar(tab, 99,99);

    Most(tab);

    }

    if(Cheio(tab) == 9)
        printf("EMPATE\n");
    if(Owin(tab))
        printf("Derrota\n");
    if(Xwin(tab))
        printf("Vitoria\n");


    Most(tab);

    return 0;


}

Basicly it verifies if the diagonal as 3 of the same char if yes return 2 else return 5. If i try to verify if is 5 or 2 it gives me a core dump.