valgrind 请求 debuginfo libc6-dbg

Question

我已经查看了与此错误相关的答案。但是，我的问题是，一旦我有了 libc 的 debuginfo，我应该将该库放置在什么位置，以便 valgrind 能够看到它？

我已经下载了 valgrind 并针对我的目标环境进行了交叉编译。我尝试了以下所有不同的组合:

1. 我将 libc 放在/lib 中，将 debuginfo 放在/lib/debug 中
2. 将 debuginfo 重命名为 libc.debug
3. 导出 VALGRIND_LIB 以包含/lib、/lib/debug

最后但并非最不重要的一点是，以下是实际错误:

==29946== Memcheck, a memory error detector
==29946== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==29946== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==29946== Command: /bin/my_prog
==29946==

valgrind:  Fatal error at startup: a function redirection
valgrind:  which is mandatory for this platform-tool combination
valgrind:  cannot be set up.  Details of the redirection are:
valgrind:
valgrind:  A must-be-redirected function
valgrind:  whose name matches the pattern:      strcmp
valgrind:  in an object with soname matching:   ld-linux-armhf.so.3
valgrind:  was not found whilst processing
valgrind:  symbols from the object with soname: ld-linux-armhf.so.3
valgrind:
valgrind:  Possible fixes: (1, short term): install glibc's debuginfo
valgrind:  package on this machine.  (2, longer term): ask the packagers
valgrind:  for your Linux distribution to please in future ship a non-
valgrind:  stripped ld.so (or whatever the dynamic linker .so is called)
valgrind:  that exports the above-named function using the standard
valgrind:  calling conventions for this platform.  The package you need
valgrind:  to install for fix (1) is called
valgrind:
valgrind:    On Debian, Ubuntu:                 libc6-dbg
valgrind:    On SuSE, openSuSE, Fedora, RHEL:   glibc-debuginfo
valgrind:
valgrind:  Note that if you are debugging a 32 bit process on a
valgrind:  64 bit system, you will need a corresponding 32 bit debuginfo
valgrind:  package (e.g. libc6-dbg:i386).
valgrind:
valgrind:  Cannot continue -- exiting now.  Sorry.

Answer 1

我遇到了同样的问题，解决方法如下:
将/lib 路径中的 ld-xx.so 替换为调试版本。

这是我的案例。我正在使用 Yocto 构建 rootfs，因此将 poky/build/tmp/work/xxxx/glibc/2.26-r0/image/lib/ld-2.26.so 从构建路径复制到 Linux FS路径 /lib，替换发布版本的原始 /lib/ld-2.26.so(和 ld-linux-armhf.so.3)。

完成此操作后，valgrind 工作正常。

警告:在正在运行的系统上更换加载程序可能会导致系统变砖!这些步骤有效:

• 上传新加载程序以定位到/lib 之外的路径
• 将新加载程序标记为可执行文件 (chmod 755)
• 复制(不要动!)旧加载程序
• 将新加载程序复制到/lib