ulimit -c 1024

echo /tmp/core > /proc/sys/kernel/core_pattern

#include <stdio.h>
  int main()
  {
  int* a=NULL;
  char aa[1];
  a=1;
  aa[20]=1;
  sleep(10000);
  printf("Hello world1000! %d\n",aa[10]);
  aa[200000]=1;
  printf("Hello world1000!\n");
  return 0;
  }

arm-linux-gcc a.c -o a

kill -11 2529