#include <stdio.h>

#include <stdlib.h>

int main()

{

char *p;

p=(char *)malloc(sizeof(char));

free(p);

free(p);

return 0;

}   

./freetwice

*** glibc detected *** ./freetwice: double free or corruption (fasttop): 0x09537008 ***

======= Backtrace: =========

/lib/i386-linux-gnu/libc.so.6(+0x6ebc2)[0x17ebc2]

/lib/i386-linux-gnu/libc.so.6(+0x6f862)[0x17f862]

/lib/i386-linux-gnu/libc.so.6(cfree+0x6d)[0x18294d]

./freetwice[0x8048445]

/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x129113]

./freetwice[0x8048381]

======= Memory map: ========

00110000-00286000 r-xp 00000000 08:09 655379  /lib/i386-linux-gnu/libc-2.13.so

00286000-00288000 r--p 00176000 08:09 655379  /lib/i386-linux-gnu/libc-2.13.so

00288000-00289000 rw-p 00178000 08:09 655379  /lib/i386-linux-gnu/libc-2.13.so

00289000-0028c000 rw-p 00000000 00:00 0

00808000-00824000 r-xp 00000000 08:09 655404  /lib/i386-linux-gnu/libgcc_s.so.1

00824000-00825000 r--p 0001b000 08:09 655404  /lib/i386-linux-gnu/libgcc_s.so.1

00825000-00826000 rw-p 0001c000 08:09 655404  /lib/i386-linux-gnu/libgcc_s.so.1

008b7000-008b8000 r-xp 00000000 00:00 0  [vdso]
00dc7000-00de5000 r-xp 00000000 08:09 655376  /lib/i386-linux-gnu/ld-2.13.so

00de5000-00de6000 r--p 0001d000 08:09 655376  /lib/i386-linux-gnu/ld-2.13.so

00de6000-00de7000 rw-p 0001e000 08:09 655376  /lib/i386-linux-gnu/ld-2.13.so

08048000-08049000 r-xp 00000000 08:07 3009831  /home/lenovo/Myprogram/Linux/mem/freetwice

08049000-0804a000 r--p 00000000 08:07 3009831  /home/lenovo/Myprogram/Linux/mem/freetwice

0804a000-0804b000 rw-p 00001000 08:07 3009831  /home/lenovo/Myprogram/Linux/mem/freetwice

09537000-09558000 rw-p 00000000 00:00 0  [heap]

b7600000-b7621000 rw-p 00000000 00:00 0

b7621000-b7700000 ---p 00000000 00:00 0

b7742000-b7743000 rw-p 00000000 00:00 0

b7758000-b775a000 rw-p 00000000 00:00 0

bff27000-bff48000 rw-p 00000000 00:00 0  [stack]

已放弃