下面有一檔案exception.c

#include <stdio.h>

int main()
{
   int code = 0;
   scanf("%d",code);
   printf("%d\n",code);
   return 0;
}

編譯
gcc -g -o exception exception.c

執行
 ./exception
3
段錯誤 (core dumped)

除錯
gdb ./exception core.24392

這時只能看到出錯庫的提示
warning: Can't read pathname for load map: 輸入/輸出錯誤.
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Core was generated by `./exception'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fc944ddd8fb in _IO_vfscanf () from /lib/libc.so.6

這時候輸入where命令
(gdb) where
#0  0x00007fc944ddd8fb in _IO_vfscanf () from /lib/libc.so.6
#1  0x00007fc944de3d9d in __isoc99_scanf () from /lib/libc.so.6
#2  0x000000000040057a in main () at exception.c:6

便可以看到程式出錯的具體位置，exception.c檔案的第六行