How to enable BTF support for ubuntu 20.04?

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#2,948 opened on Jun 3, 2020 8 comments 0 reactions 0 assignees View on GitHub

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Description

I tried to enable BTF support by rebuilding kernel with CONFIG_DEBUG_INFO_BTF=y.

The specific configuration is shown below:

Kernel version:
![image](https://user-images.githubusercontent.com/16064432/83645652-4c096780-a5e5-11ea-8c87-0aa098da1760.png)

Clang and LLVM version:
![image](https://user-images.githubusercontent.com/16064432/83645813-7e1ac980-a5e5-11ea-916f-3c17b725b485.png)
![image](https://user-images.githubusercontent.com/16064432/83645862-8a9f2200-a5e5-11ea-8f40-9ebba166aab2.png)

And /sys/kernel/btf/vmlinux exist.
![image](https://user-images.githubusercontent.com/16064432/83646120-d651cb80-a5e5-11ea-9ed9-b260e5bab8e5.png)
bpftool btf dump file /sys/kernel/btf/vmlinux format c > vmlinux.h is OK.

**However, I encouter this problem:**
![image](https://user-images.githubusercontent.com/16064432/83646391-2761bf80-a5e6-11ea-8935-7b479b9e5c8c.png)

**So actually opensnoop use kprobe and kretprobe to get the filled funcation arguments.
KFUNC and KRETFUNC are not load successfully.**

I don't know what's going wrong. Is there anybody meet similar problems? Very gratefull if you have any suggestions!

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How to enable BTF support for ubuntu 20.04?

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