Вальгринд разрывается с dirname?

==11136== Invalid read of size 8
==11136==    at 0x5AFC696: memrchr (memrchr.S:289)
==11136==    by 0x5B57FAF: dirname (dirname.c:45)
==11136==    by 0x405F43: push::lg_cmd_dirname(push::Env&) (LGExtension.cpp:379)
==11136==    by 0x42533C: push::Instruction::operator()(push::Env&) const (in /home/bots/svn/eco/branches/skynet_BigPUSH/src/push3.0/extension/push_bloodline)
==11136==    by 0x488ECD: push::Env::go(int) (Env.cpp:72)
==11136==    by 0x4A84D5: main (bloodline.cpp:99)
==11136==  Address 0x640daf8 is 8 bytes inside a block of size 10 alloc'd
==11136==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==11136==    by 0x5AEF801: strdup (strdup.c:43)
==11136==    by 0x405EF2: push::lg_cmd_dirname(push::Env&) (LGExtension.cpp:369)
==11136==    by 0x42533C: push::Instruction::operator()(push::Env&) const (in /home/bots/svn/eco/branches/skynet_BigPUSH/src/push3.0/extension/push_bloodline)
==11136==    by 0x488ECD: push::Env::go(int) (Env.cpp:72)
==11136==    by 0x4A84D5: main (bloodline.cpp:99)
==11136==

Это законная ошибка? Похоже, что чтение происходит внутри допустимого блока. В моей программе вызов выглядит так:

        char *path = strdup(full_path.c_str());
cerr << "Path is : " << path << endl;
result = dirname(path);
if(result < 0){
cerr << "Dirname failed for some reason. Check log." << endl;
}

и вывод к cerr во время ошибки:

Path is : /tmp/tmp/

который является допустимым путем. У Dirname не должно быть проблем с этим, и он работает с кучей выделенных дубликатов.

РЕДАКТИРОВАТЬ:

Вот минимальный пример, который выдаст эту ошибку:

#include <string.h>
#include <stdio.h>
#include <iostream>
#include <libgen.h>

int main(){

char *path = strdup("/tmp/tmp/");
char* result = dirname(path);
std::cerr << result << std::endl;
}

скомпилировать с g ++.

запустить с Valgrind, и вы получите:

==32466== Memcheck, a memory error detector
==32466== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==32466== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==32466== Command: ./a.out
==32466==
==32466== Invalid read of size 8
==32466==    at 0x51C7696: memrchr (memrchr.S:289)
==32466==    by 0x5222FAF: dirname (dirname.c:45)
==32466==    by 0x400865: main (in /home/j3doucet/a.out)
==32466==  Address 0x59ff048 is 8 bytes inside a block of size 10 alloc'd
==32466==    at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==32466==    by 0x51BA801: strdup (strdup.c:43)
==32466==    by 0x400855: main (in /home/j3doucet/a.out)
==32466==
/tmp
==32466==
==32466== HEAP SUMMARY:
==32466==     in use at exit: 10 bytes in 1 blocks
==32466==   total heap usage: 1 allocs, 0 frees, 10 bytes allocated
==32466==
==32466== LEAK SUMMARY:
==32466==    definitely lost: 10 bytes in 1 blocks
==32466==    indirectly lost: 0 bytes in 0 blocks
==32466==      possibly lost: 0 bytes in 0 blocks
==32466==    still reachable: 0 bytes in 0 blocks
==32466==         suppressed: 0 bytes in 0 blocks
==32466== Rerun with --leak-check=full to see details of leaked memory
==32466==
==32466== For counts of detected and suppressed errors, rerun with: -v
==32466== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)