瓦尔格林德'uninitialised value'依赖项不引用我的代码

Valgrind 'uninitialised value' dependency doesn't reference my code

本文关键字：代码 我的 依赖 引用 uninitialised 林德 value      更新时间：2023-10-16

这个valgrind输出让我感到困惑，因为它似乎没有引用我的代码，并且我已经在使用STL编写的多个程序中得到了它，尽管没有HEAP SUMMARY错误:

$ valgrind -v --leak-check=full --track-origins=yes ./hellostl
...
==7989== Conditional jump or move depends on uninitialised value(s)
==7989==    at 0x4017AA6: index (in /lib64/ld-2.17.so)
==7989==    by 0x4007A12: expand_dynamic_string_token (in /lib64/ld-2.17.so)
==7989==    by 0x4008304: _dl_map_object (in /lib64/ld-2.17.so)
==7989==    by 0x400181D: map_doit (in /lib64/ld-2.17.so)
==7989==    by 0x400E985: _dl_catch_error (in /lib64/ld-2.17.so)
==7989==    by 0x40010EF: do_preload (in /lib64/ld-2.17.so)
==7989==    by 0x40039D7: dl_main (in /lib64/ld-2.17.so)
==7989==    by 0x40152B7: _dl_sysdep_start (in /lib64/ld-2.17.so)
==7989==    by 0x4004E94: _dl_start (in /lib64/ld-2.17.so)
==7989==    by 0x4001637: ??? (in /lib64/ld-2.17.so)
==7989==  Uninitialised value was created by a stack allocation
==7989==    at 0x4003961: dl_main (in /lib64/ld-2.17.so)
==7989==
==7989== Conditional jump or move depends on uninitialised value(s)
==7989==    at 0x4017AAB: index (in /lib64/ld-2.17.so)
==7989==    by 0x4007A12: expand_dynamic_string_token (in /lib64/ld-2.17.so)
==7989==    by 0x4008304: _dl_map_object (in /lib64/ld-2.17.so)
==7989==    by 0x400181D: map_doit (in /lib64/ld-2.17.so)
==7989==    by 0x400E985: _dl_catch_error (in /lib64/ld-2.17.so)
==7989==    by 0x40010EF: do_preload (in /lib64/ld-2.17.so)
==7989==    by 0x40039D7: dl_main (in /lib64/ld-2.17.so)
==7989==    by 0x40152B7: _dl_sysdep_start (in /lib64/ld-2.17.so)
==7989==    by 0x4004E94: _dl_start (in /lib64/ld-2.17.so)
==7989==    by 0x4001637: ??? (in /lib64/ld-2.17.so)
==7989==  Uninitialised value was created by a stack allocation
==7989==    at 0x4003961: dl_main (in /lib64/ld-2.17.so)

是否有可能我正在使用过时的版本的东西(例如编译器，valgrind…)?

编辑:触发bug的简单代码:

#include <vector>
#include <iostream>
using namespace std;
int main ()
{
    vector<int> foo;
    for (int i = 0; i < 50; ++i)
        foo.push_back( i );
    for (auto it = foo.begin();
        it != foo.end();
        ++it)
    {
        cout << *it << endl;
    }
}

动态链接库因导致Valgrind警告而臭名昭著。你观察到的这个其实是很常见的。您无法修复此警告，但如果它惹恼了您，您可以添加抑制规则。

更详细地说，这里发生的事情是在程序运行之前，c++标准库被动态链接。如果用ldd检查二进制文件，您应该看到这样一行:

    libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fa0e2f72000)

如果你静态链接这个库，你的程序将在没有动态链接的情况下运行，并且警告将消失。

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