Valgrind实战:Linux C/C++内存问题排查指南

# Ubuntu/Debiansudo apt updatesudo apt install valgrind# CentOSsudo yum install valgrind

# 下载最新源码wget https://sourceware.org/pub/valgrind/valgrind-3.19.0.tar.bz2tar -xjf valgrind-3.19.0.tar.bz2cd valgrind-3.19.0# 编译安装./configure --prefix=/usr/localmakesudo make install

#include<stdio.h>#include<stdlib.h>#include<memory>// 1. check memory leakvoidtest_memory_leak(){  printf("test memory leak...\n");  int* p = (int*)malloc(sizeof(int));  // free(p);}intmain(int argc, char** argv){  test_memory_leak();  return 0;}

g++ -g -o main main.cpp

#include<stdio.h>#include<stdlib.h>#include<memory>// 2. check memory out of bondvoidtest_out_of_bond(){  printf("test out of bond...\n");  int arr[10];  arr[10] = 6; // max index = 9}intmain(int argc, char** argv){  test_out_of_bond();   return 0;}

#include<stdio.h>#include<stdlib.h>#include<memory>// 3. check use uninit memoryvoidtest_uninitialized_memory(){  printf("test uninitialized memory...\n");  int value;  if(value >0) printf("value is pasitive...\n");}intmain(int argc, char** argv){  test_uninitialized_memory();   return 0;}

#include<stdio.h>#include<stdlib.h>#include<memory>// 4. invalid freevoidtest_invalid_free(){  printf("test invalid free...\n");  int stack_var;  int *stack_ptr = &stack_var;  free(stack_ptr);}intmain(int argc, char** argv){  test_invalid_free();    return 0;}

#include<stdio.h>#include<stdlib.h>#include<memory>// 5. double freevoidtest_double_free(){  printf("test double free...\n");  int* p = (int*)malloc(sizeof(int));  free(p); // first free  free(p); // double free}intmain(int argc, char** argv){  test_double_free();    return 0;}

#include<stdio.h>#include<stdlib.h>#include<memory>// 6. heap overflow voidtest_heap_overflow(){  char* p = (char*)malloc(sizeof(char) * 4);  p[4] = 6; // max index = 3  free(p);}intmain(int argc, char** argv){  test_heap_overflow();    return 0;}

valgrind --verbose ./main 

valgrind --log-file=valgrind_report.txt ./main