[BUG] Error log from libbpf when attach tc BPF repeatedly

[CH3CHOHCH3]

Describe the bug
ecli output of the first attach :

# ecli run examples/bpftools/tc/package.json
INFO [faerie::elf] strtab: 0x80a symtab 0x848 relocs 0x890 sh_offset 0x890
INFO [bpf_loader_lib::skeleton::poller] Running ebpf program...

Press ctrl-c and rerun ecli, the output turns into:

# ecli run examples/bpftools/tc/package.json
INFO [faerie::elf] strtab: 0x80a symtab 0x848 relocs 0x890 sh_offset 0x890
libbpf: Kernel error message: Exclusivity flag on, cannot modify
INFO [bpf_loader_lib::skeleton::poller] Running ebpf program...

This message is harmless according to https://www.spinics.net/lists/bpf/msg44842.html but maybe we can use libbpf_set_print to filter logs from libbpf like https://elixir.bootlin.com/linux/v5.10.53/source/tools/testing/selftests/bpf/test_progs.c#L667.

[github-actions]

Thanks for using eunomia-bpf! We appreciate your help and we’ll take care of this as soon as possible.

[yunwei37]

This maybe due to failed to detach tc hooks gracefully, see the code comments in libbpf-bootstrap

https://github.com/libbpf/libbpf-bootstrap#tc

https://github.com/libbpf/libbpf-bootstrap/blob/859c2339dd5cb6c09a1819c52f73cd63976fa9bf/examples/c/tc.c#L38

[Officeyutong]

Has this issue been done now?