Re: selftests/bpf :get_cgroup_id_user: File not found: /sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id

[Daniel Borkmann]

Hi Naresh,

On 11/21/2018 06:53 PM, Y Song wrote:
> On Wed, Nov 21, 2018 at 3:44 AM Naresh Kamboju
>  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.

If that does the trick for you, could you add that to the BPF kselftest
config snippet?

Thanks,
Daniel

Re: selftests/bpf :get_cgroup_id_user: File not found: /sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id

[Y Song]

On Wed, Nov 21, 2018 at 3:44 AM Naresh Kamboju
 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

selftests/bpf :get_cgroup_id_user: File not found: /sys/kernel/debug/tracing/events/syscalls/sys_enter_nanosleep/id

[Naresh Kamboju]

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 ?

Best regards
Naresh Kamboju