Could not open /sys/fs/cgroup/cgroup.procs

[Zplusless]

The cproup.procs problem starts from commit dcd905c on 20231222. The five recent master commits are tested as follows.

version	has this info	commit date
5e6f50a	no
374200d	no
55c984b	no	20231207
dcd905c	yes	20231222
0b2702c	yes	20240115

The host OS is Ubuntu 20.04 with kernel version 5.4.0. I checked /sys/fs/cgroup/ and found that there is no cgroup.proc in the directory:

However, cgroup.proc could be found in /sys/fs/cgroup/cpuset:

I'm not sure if it is ok to create a soft link of /sys/fs/cgroup/cpuset/cgroup.proc under /sys/fs/cgroup/cpuset/ and what the influences of this error message are.

gnb.log

gnb_zmq-fusion.yaml.txt

[pgawlowicz]

Hi @Zplusless, any update on this issue?

[pgawlowicz]

do you start only one gnb instance or multiple?

[Zplusless]

only one

[pgawlowicz]

hmm, I tested your config, and it runs without this issue. Then it might be your machine problem. Could you try with a different PC?

[Zplusless]

I tried on another machine(centos stream9 with srsRAN-master-0b2702c), it runs without the cgroup problem. I checked /sys/fs/cgroup and find cgroup.procs. So I suppose it is a OS problem. Since Ubuntu start to use cgroup v2 by default since ubuntu-21.10(check this link).

Considering cgroup v1 and v2 have different dir structure in /sys/fs/cgroup, low version of ubuntu (e.g. ubuntu20.04) may has this output.

Thanks @pgawlowicz, I'll close this discuss as solved.