pwru
pwru copied to clipboard
cilium
--filter-trace-tc option doesn't work with Cilium
Hi, I’m running the pwru in the k8s server which running the cilium 1.11 version. everything works well but failed to start when I enabled the filter-trace-tc options, it showed the following error.
Failed to load objects: Verifier error: load program: invalid argument
func#0 @0
func#1 @37
func#2 @859
func#3 @1044
Subprog __send_drop_notify doesn't exist
Program fentry_tc: load program: invalid argument: Subprog __send_drop_notify doesn't exist (5 line(s) omitted
As I know, the _send_drop_notify is the function defined in the cilium code base and I don’t know how to fix it to ensure I can run the filter-trace-tc option with pwru in my server, any clue or options I can check?
Environment: OS: Ubuntu 20.04 Kernel: 5.15.0.69 pwru: master branch(2024/02/01).
@hwchiu Thanks for the issue! Have you tried running with more recent Cilium version?
@brb Thanks for the reply and unfortunately, I'm not able to upgrade the cilium version in that environment, but I will try to reproduce the issue in my home lab and then try the latest cilium to see if the issue still exists.
I just ran into this as well with an ebpf program I wrote. I compiled it with clang and embedded the btf information. Clearly the subprog in question exists.
What kind of extra info would be needed to investigate this? I can try to reduce my program to the minimal repro case.
What kind of extra info would be needed to investigate this? I can try to reduce my program to the minimal repro case.
Which kernel and what Cilium vsn, what distro and how do you run K8s?
The PR #383 fixes this issue.
This issue will happen when the very first function name in BTF info is out of the traced bpf prog.
I reproduce this case, and fix it by PR #383 .
sudo ./pwru --filter-trace-tc --filter-func '.*ip_out.*' --output-meta --output-tuple --output-limit-lines 10 icmp
2024/06/12 13:23:08 Failed to trace TC: failed to load objects: Verifier error: load program: invalid argument:
func#0 @0
func#1 @40
func#2 @967
func#3 @1024
Subprog phy_on_ingress doesn't exist
processed 0 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0
program fentry_tc: load program: invalid argument: Subprog phy_on_ingress doesn't exist (5 line(s) omitted)
