c++ - 如何找到错误 : *** Error in `./a.out' : free(): invalid next size (fast): 0x09767150 ***

Question

我的 main.cpp 和 grid.h 编译成功。当我在调整网格大小后使用函数 fill 时会出现问题。运行程序后会产生错误:

* Error in `./a.out': free(): invalid next size (fast): 0x0871d150 *

主要.cpp

#include "grid.h"
#include <cstdlib>

#if 1
    #define log(x) std::cout << x << std::endl;
#else
    #define log(x) 
#endif  

#ifdef _GLIBCXX_CSTDLIB
    #define clear system("clear");
    #define reset system("reset");
#else
    #define clear
    #define reset
#endif

std::pair<const int, const int> LARGE  = std::make_pair(8,8);
std::pair<const int, const int> MEDIUM = std::make_pair(6,6);
std::pair<const int, const int> SMALL  = std::make_pair(4,4); 


int main(){
    clear
    grid<char> a(LARGE,'#');
    grid<int>  b(4,5,   9 );
    a.resize(4,8);
    b.resize(MEDIUM);
    b.fill(8);
    log(a);
    log(b);
    return 0;
}

网格.h

#ifndef GRID_H
#define GRID_H

#include <iostream>
#include <vector>

template<typename type>
class grid{
    public://Functions
        grid(std::pair<const type, const type> dimension, type filler = 0) : rows(dimension.first), cols(dimension.second){
                matrix.assign(rows, std::vector<type>(cols, filler));
        };
        grid(const int _rows, const int _cols, type filler = 0) : rows(_rows), cols(_cols){
                matrix.assign(rows, std::vector<type>(cols, filler));
        };
        void resize(std::pair<const type, const type> dimension){
            rows = dimension.first, cols = dimension.second;
            matrix.resize(rows, std::vector<type>(cols));
        };
        void resize(const int _rows, const int _cols){
            rows = _rows, cols = _cols;
            matrix.resize(rows, std::vector<type>(cols));
        };
        void fill(type filler){
            for(int r = 0; r < rows; r++){
                for(int c = 0; c < cols; c++){
                    matrix[r][c] = filler;
                }
            }
        };
    public://Operators
        friend std::ostream& operator<<(std::ostream& out, grid& g){
            for(int r = 0; r < g.rows; r++){
                for(int c = 0; c < g.cols; c++){
                    out << g.matrix[r][c];
                }out << std::endl;
            }return out;
        };
        //Variables
        std::vector<std::vector<type>> matrix;
        int  rows;
        int  cols;
};

#endif//GRID_H

控制台输出

dylan@Aspire-one:~$ ./a.out
########
########
########
########

888888
888888
888888
888888
888888
888888

*** Error in `./a.out': free(): invalid next size (fast): 0x09767150 ***
Aborted (core dumped)
dylan@Aspire-one:~$ 

Answer 1

Error in './a.out': free(): invalid next size (fast): 0x0871d150

此错误总是意味着您的程序损坏了它的堆(例如写入超过堆分配缓冲区的末尾)。

找到这个问题的标准方法是在 Valgrind 下运行您的程序，它会直接指出问题所在。

Address sanitizer (gcc -fsanitize=address -g ...) 是另一种用于查找此地址的标准工具。