在 valgrind 中检查内存泄漏答案

【问题标题】：Memory leaks checked in valgrind在 valgrind 中检查内存泄漏
【发布时间】：2013-01-26 10:30:29
【问题描述】：
我的老师说我的程序有内存泄漏，所以我使用 valgrind 来检查它。我收到以下错误：
==24060== Invalid read of size 8
==24060==    at 0x4EB4B4C: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E253: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dc040 is 0 bytes inside a block of size 5 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4E63D43: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E23D: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB4B54: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E253: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dc048 is 3 bytes after a block of size 5 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4E63D43: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E23D: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB4931: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E266: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dc040 is 0 bytes inside a block of size 5 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4E63D43: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E23D: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Conditional jump or move depends on uninitialised value(s)
==24060==    at 0x4EB493F: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5DF87: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Conditional jump or move depends on uninitialised value(s)
==24060==    at 0x4E5DF8D: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Conditional jump or move depends on uninitialised value(s)
==24060==    at 0x4E5DFAF: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Use of uninitialised value of size 8
==24060==    at 0x4E5E033: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Use of uninitialised value of size 8
==24060==    at 0x4E5E041: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Conditional jump or move depends on uninitialised value(s)
==24060==    at 0x4E5E047: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Conditional jump or move depends on uninitialised value(s)
==24060==    at 0x4EB2E42: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E06C: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Use of uninitialised value of size 8
==24060==    at 0x4EB4214: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E06C: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Use of uninitialised value of size 8
==24060==    at 0x4EB4218: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E06C: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB2E1E: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CECD: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dc158 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E129: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB4931: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4EB4585: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CEE4: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dc158 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E129: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB2E23: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5DEFA: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dc158 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5E129: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D328: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CE85: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB4931: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5C9D2: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D0B2: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dd568 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CEE4: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB2E1E: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CA0F: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D0B2: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dd518 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CEE4: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB2E23: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CA0F: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D0B2: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dd568 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CEE4: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB2E1E: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CA83: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D0B2: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dd568 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CEE4: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060== 
==24060== Invalid read of size 8
==24060==    at 0x4EB2E1E: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CA9D: ??? (in /lib64/libc-2.16.so)
==24060==    by 0x4E5D0B2: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==  Address 0x51dd568 is 8 bytes inside a block of size 12 alloc'd
==24060==    at 0x4C2AD7B: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==24060==    by 0x4EB4591: strdup (in /lib64/libc-2.16.so)
==24060==    by 0x4E5CEE4: setlocale (in /lib64/libc-2.16.so)
==24060==    by 0x401751: ??? (in /usr/bin/test)
==24060==    by 0x4E52804: (below main) (in /lib64/libc-2.16.so)
==24060==
谁能帮我理解这个错误是什么意思？
【问题讨论】：
我发现实际上没有内存泄漏，但是我想摆脱这些其他错误。
我用 -g 标志编译，但没有帮助。也许问题是我在项目中有一个头文件？
如果您还没有，请尝试使用 -Wall 编译程序以突出显示所有警告，并使用 -Werror 将警告视为错误。如果出现任何问题，请修复它们，无论它们多么微不足道。每当您使用 C 进行编码时，我都会推荐这种做法。
标签： memory valgrind memory-leaks
【解决方案1】：
为什么 valgrind 输出不显示行号？我不知道在哪里寻找这个错误。我用标志 -g 编译了我的程序，并使用以下语法使用 valgrind： valgrind --tool=memcheck --track-origins=yes -q test
【讨论】：
您是否创建了一个新帐户以便回答您自己的问题？
这是一个错误，对不起。 :)