hash_set core dump on memory free

[Rakesh]

Hi -

  What is wrong this implementation? I get a core dump at the free()
statement? Thanks

Rakesh

#include <ext/hash_map>
#include <iostream.h>
#include <ext/hash_set>


using namespace std;
using namespace __gnu_cxx;

struct eqstr
{
  bool operator()(char* s1, char* s2) const
  {
    return strcmp(s1, s2) == 0;
  }
};

int main()
{

  char *s, *s1, *temp;
  hash_set<char *, hash<char *>, eqstr> AddedPhrases;
  hash_set<char*, hash<char*>, eqstr> ::iterator Iter1;


  s = (char *)malloc(sizeof(char)*100);
  strcpy(s, "apple");
  AddedPhrases.insert(s);

  s1 = (char *)malloc(sizeof(char)*100);
  strcpy(s1, "absent");
  AddedPhrases.insert(s1);
  for (Iter1 = AddedPhrases.begin(); Iter1 != AddedPhrases.end();
Iter1++)
  {
         temp = *Iter1;
         //printf("\nDeleting:%s:%d", temp, strlen(temp));
         free(temp);
  }
}

$ g++ test3.cpp
$ ./a.out

Deleting:apple:5
Deleting:absent:6
*** glibc detected *** ./a.out: double free or corruption (!prev):
0x09fa2310 ***
======= Backtrace: =========
/lib/libc.so.6[0x6b9f18]
/lib/libc.so.6(__libc_free+0x79)[0x6bd41d]
./a.out(__gxx_personality_v0+0x274)[0x804892c]
/lib/libc.so.6(__libc_start_main+0xdc)[0x66b7e4]
./a.out(__gxx_personality_v0+0x69)[0x8048721]
======= Memory map: ========
0053b000-00546000 r-xp 00000000 fd:00 38110218
/lib/libgcc_s-4.1.0-20060304.so.1
00546000-00547000 rwxp 0000a000 fd:00 38110218
/lib/libgcc_s-4.1.0-20060304.so.1
00549000-0062b000 r-xp 00000000 fd:00 19344300
/usr/lib/libstdc++.so.6.0.8
0062b000-0062f000 r-xp 000e2000 fd:00 19344300
/usr/lib/libstdc++.so.6.0.8
0062f000-00630000 rwxp 000e6000 fd:00 19344300
/usr/lib/libstdc++.so.6.0.8
00630000-00636000 rwxp 00630000 00:00 0
00639000-00652000 r-xp 00000000 fd:00 38110213   /lib/ld-2.4.so
00652000-00653000 r-xp 00018000 fd:00 38110213   /lib/ld-2.4.so
00653000-00654000 rwxp 00019000 fd:00 38110213   /lib/ld-2.4.so
00656000-00782000 r-xp 00000000 fd:00 38110214   /lib/libc-2.4.so
00782000-00785000 r-xp 0012b000 fd:00 38110214   /lib/libc-2.4.so
00785000-00786000 rwxp 0012e000 fd:00 38110214   /lib/libc-2.4.so
00786000-00789000 rwxp 00786000 00:00 0
0078b000-007ae000 r-xp 00000000 fd:00 38110217   /lib/libm-2.4.so
007ae000-007af000 r-xp 00022000 fd:00 38110217   /lib/libm-2.4.so
007af000-007b0000 rwxp 00023000 fd:00 38110217   /lib/libm-2.4.so
00974000-00975000 r-xp 00974000 00:00 0          [vdso]
08048000-0804c000 r-xp 00000000 fd:00 24674319   /home/oracle/a.out
0804c000-0804d000 rw-p 00003000 fd:00 24674319   /home/oracle/a.out
09fa2000-09fc3000 rw-p 09fa2000 00:00 0          [heap]
b7e00000-b7e21000 rw-p b7e00000 00:00 0
b7e21000-b7f00000 ---p b7e21000 00:00 0
b7fa8000-b7fac000 rw-p b7fa8000 00:00 0
bf897000-bf8ac000 rw-p bf897000 00:00 0          [stack]
Deleting:Xax:3Aborted


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