On Wed, Nov 21, 2018 at 3:44 AM Naresh Kamboju
<naresh.kamboju@xxxxxxxxxx> wrote:
>
> Kselftest bpf get_cgroup_id_user is failed on all devices.
>
> selftests: bpf: get_cgroup_id_user
> main:PASS:setup_cgroup_environment
> main:PASS:create_and_get_cgroup
> main:PASS:join_cgroup
> main:PASS:bpf_prog_load
> main:PASS:bpf_find_map
> main:PASS:bpf_find_map
> main:FAIL:open err -1 errno 2
> not ok 1..15 selftests: bpf: get_cgroup_id_user [FAIL]
>
> The strace output shows,
> This expected file not found,
> "/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id"
>
> bpf(BPF_MAP_UPDATE_ELEM, {map_fd=5, key=0x7fff0c68c138,
> value=0x7fff0c68c13c, flags=BPF_ANY}, 72) = 0
> open(\"/sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id\",
> O_RDONLY) = -1 ENOENT (No such file or directory)
> write(1, \"main:FAIL:open err -1 errno 2\n\", 30main:FAIL:open err -1 errno 2
>
> Am I missing any pre-requirement ?
You probably miss kernel config CONFIG_FTRACE_SYSCALLS.
>
> Best regards
> Naresh Kamboju
