异常：执行 sudo opensnoop-bpfcc 时无法将 BPF 附加到 kprobe

Question

当我尝试执行sudo opensnoop-bpfcc ，我收到以下消息：

In file included from /virtual/main.c:4:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:5:
In file included from include/linux/rculist.h:11:
In file included from include/linux/rcupdate.h:40:
In file included from include/linux/preempt.h:81:
In file included from ./arch/x86/include/asm/preempt.h:7:
In file included from include/linux/thread_info.h:38:
In file included from ./arch/x86/include/asm/thread_info.h:53:
./arch/x86/include/asm/cpufeature.h:150:2: warning: "Compiler lacks ASM_GOTO support. Add -D __BPF_TRACING__ to your compiler arguments"
      [-W#warnings]
#warning "Compiler lacks ASM_GOTO support. Add -D __BPF_TRACING__ to your compiler arguments"
 ^
1 warning generated.
Traceback (most recent call last):
  File "/usr/sbin/opensnoop-bpfcc", line 127, in <module>
    b.attach_kprobe(event="sys_open", fn_name="trace_entry")
  File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 526, in attach_kprobe
    raise Exception("Failed to attach BPF to kprobe")
Exception: Failed to attach BPF to kprobe

我不明白如何解决它。 我刚刚使用此命令安装了密件抄送工具

sudo apt-get install bpfcc-tools linux-headers-$(uname -r)

正如 github 页面https://github.com/iovisor/bcc/blob/master/INSTALL.md#ubuntu---binary所建议的那样

正在运行的操作系统是 18.04.2 LTS（仿生海狸）。

Answer 1

我不得不从源代码编译 bcc 而不是使用包安装它。

1）安装linux内核头文件

sudo apt install linux-headers-$(uname -r)

2）安装所需的依赖项

sudo apt-get -y install bison build-essential cmake flex git libedit-dev \\ libllvm6.0 llvm-6.0-dev libclang-6.0-dev python zlib1g-dev libelf-dev

3) 从源代码编译 bcc

 git clone github.com/iovisor/bcc.git
 mkdir bcc/build; cd bcc/build 
 cmake .. -DCMAKE_INSTALL_PREFIX=/usr 
 make 
 sudo make install 

Answer 2

@Maicake 是对的。 从源代码编译和安装确实对我有用。 以下是在 Ubuntu 22.04 上安装的步骤：

1. 按照此处描述的步骤进行操作。 特别是对于 Ubuntu 22.04，您可能需要在克隆密件抄送存储库后进行一些更改。

2. 将以下行添加到您的.bashrc文件中：

   export PATH=$PATH:/usr/share/bcc/tools

3. 创建指向 python3 的符号链接，因为大多数工具使用python （不是python3 ）来运行脚本。

   sudo ln -s /usr/bin/python3 /usr/bin/python