erreur core dumped dans ma fonction

alors voila mon fichier laby.c:
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define longueur 15
#define largeur 10
void initialisation (void);
void liberer2d(int***,int);
int **allouer2d(int,int);
int main (void){
initialisation();
return 0;
}

void initialisation (void){
int k,i,j,nbcaseAzero,x,y,d;
int **laby;
laby=3Dallouer2d(longueur,largeur);
nbcaseAzero=3D1;
k=3D0;
for (i=3D0;i<longueur;i++){
for (j=3D0;j<largeur; j++){
if ((i%2!=3D0) && j%2!=3D0){
laby[i][j]=3Dk;
k=3Dk+1;
}
else laby[i][j]=3D-1;
}
}
while (nbcaseAzero<(longueur*largeur)){
x=3D(rand() % (longueur-2)+1);
y=3D(rand() % (largeur-2)+1);
while (laby[x][y]!=3D-1){
x=3D(rand() % (longueur-2)+1);
y=3D(rand() % (largeur-2)+1);}
if (i%2!=3D0){
d=3Dlaby[x][y-1]-laby[x][y+1];
if (d>0) {
laby[x][y]=3Dlaby[x][y+1];
/*fonction propager*/;
}
else if (d<0){
laby[x][y]=3Dlaby[x][y-1];
/*fonction propager*/;
}
}
else if (y%2!=3D0){
d=3Dlaby[x-1][y]-laby[x+1][y];
if (d>0) {
laby[x][y]=3Dlaby[x+1][y];
/*fonction propager*/;
}
else if (d<0){
laby[x][y]=3Dlaby[x-1][y];
/*fonction propager*/;
}
}
}
}

int **allouer2d(int l,int h){
int i, **t;
t=3Dmalloc(h*sizeof*t);
assert(t);
for (i=3D0;i<h;i++){
t[i]=3Dmalloc (l*sizeof*t[i]);
assert (t[i]);
}
return t;
}


void liberer2d(int*** q,int h){
int i;
for (i=3D0;i<h;i++)
free(*q);
*q=3DNULL;
}

alors lorsque je compile mon fichier avec gcc -Wall monfichier.c tous
ce passe bien.
Mais d=E9s que je lance le a.out j'ai Erreur de segmentation (core
dumped)

lorsque je lance gbd comme ce-ci: gdb ./a.out core
j'obtiens cela
GNU gdb 6.6-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for
details.
This GDB was configured as "i486-linux-gnu"...
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.
1".

warning: exec file is newer than core file.

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /lib/tls/i686/cmov/libc.so.6...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Core was generated by `./a.out'.
Program terminated with signal 11, Segmentation fault.
#0 0x0804858c in initialisation ()
(gdb)

quand je met en commande where j'obtiens cela
#0 0x0804858c in initialisation ()
#1 0x0804850b in initialisation ()
#2 0xb7e56ebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.
6
#3 0x08048391 in _start ()

pourriez vous m'aidez svp