[Bug] Kernel 6.8.1 bpf missing
Closed this issue · 4 comments
What happens?
bpf is not loaded properly with kernel 6.8.1-cachyos-lto.
What is expected to happen?
Expect scx working properly. With kernel 6.8.0-cachyos-lto, it was working flawlessly.
If possible, please attach logs
flake git:(master) ✗ ❯❯❯ sudo scx_rustland
libbpf: failed to find valid kernel BTF
libbpf: Error loading vmlinux BTF: -3
libbpf: failed to load object 'bpf_bpf'
libbpf: failed to load BPF skeleton 'bpf_bpf': -3
Error: Failed to load BPF program
Caused by:
No such process (os error 3)
✖ 1 flake git:(master) ✗ ❯❯❯More information
No response
Any help would be appreciated.
BPF is still enabled in current cachyos-lto configuration:
For some reason, there are a few flags that the config generation script removed between 6.8.0 and 6.8.1:
e97791b#diff-8d2426c5e3ace6f3c2793347e1b894f929ae7d4bc830caa07e85c7ede7fb2371L8888
Some of these flags will have to be re-enabled for sched-ext to work again.
Is there any misalignment with https://github.com/CachyOS/linux-cachyos/blob/master/linux-cachyos-sched-ext/config?
Firstly, the scx patch was updated and now includes stuff for https://github.com/sched-ext/scx/pull/191, so we need to test with the latest scx, which is easy:
git clone --single-branch --depth 1 'https://github.com/sched-ext/scx.git'
cd ./scx/scheds/rust/scx_rusty
nix develop --impure chaotic#scx.scx-rusty
cargo build
sudo ./target/debug/scx_rusty
But it fails in the same way, so this has to be something in our config.
inputs = {
chaotic = { url = "github:chaotic-cx/nyx/nyxpkgs-unstable"; inputs.nixpkgs.follows = "nixpkgs-small"; };
chaotic-kernel = { url = "github:chaotic-cx/nyx/73e16a06baf8a9bb273a131b10b142f620c2b610"; inputs.nixpkgs.follows = "nixpkgs-small"; };
}I currently pinned my upstream with commit 73e16a06baf8a9bb273a131b10b142f620c2b610 as a temporarily workaround. Any updates will be appreciated, thanks.