setting pids.max failed with cgroups v2

[Muyan0828]

Describe the bug

setting pids.max failed with cgroups v2

Environment details

• Image/version of Ceph CSI driver : quay.io/cephcsi/cephcsi:v3.7.0
• Helm chart version :
• Kernel version : 5.15.0-47-generic
• Mounter used for mounting PVC (for cephFS its fuse or kernel. for rbd its
  krbd or rbd-nbd) :
• Kubernetes cluster version : v1.21.14
• Ceph cluster version : v14.2.11

Steps to reproduce

Steps to reproduce the behavior:

1. Deploy cephcsi on Ubuntu 22

Actual results

csi pod cannot set pids.max.

Expected behavior

csi pod can set pids.max.

Logs

E0915 01:33:41.157796 1 cephcsi.go:208] Failed to get the PID limit, can not reconfigure: open /sys/fs/cgroup//pids.max: no such file or directory

Additional context

run cat /proc/1/cgroup in csi-cephfsplugin

[root@vm-01 /]# ps -aux
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root           1  0.0  0.3 1673412 64456 ?       Ssl  01:33   0:01 /usr/local/bin/cephcsi --nodeid=192.168.176.68 --type=cephfs --endpoint=unix:///csi/csi.sock --v=0 --nodeserver=true --drivername=rook-ceph.cephfs.csi.ceph.com --pidlimit=
root          80  0.0  0.0  12184  3360 pts/0    Ss   04:21   0:00 bash
root          97  0.0  0.0  47620  3600 pts/0    R+   04:22   0:00 ps -aux
[root@vm-01 /]# cat /proc/1/cgroup
0::/

For example:

Any existing bug report which describe about the similar issue/behavior

[Muyan0828]

@Madhu-1 cc

[Madhu-1]

same as #3085? #3091 should have fixed it.

[Muyan0828]

but the version I'm using is quay.io/cephcsi/cephcsi:v3.7.0, #3091 is already merged in the release

[Madhu-1]

@Muyan0828 i need to reproduce it locally and see whats happening. Thanks for reporting this one.

[Madhu-1]

vagrant@worker0:~/ceph-csi$ kuberc logs po/csi-rbdplugin-x8tnk -c csi-rbdplugin
I1006 11:38:05.844207   25589 cephcsi.go:192] Driver version: v3.7.0 and Git version: 34fd27bbd1b9e0efff48805d025a1069b5dbbc53
I1006 11:38:05.845335   25589 cephcsi.go:210] Initial PID limit is set to 4575
I1006 11:38:05.845706   25589 cephcsi.go:216] Reconfigured PID limit to -1 (max)
I1006 11:38:05.846423   25589 cephcsi.go:241] Starting driver type: rbd with name: rook-ceph.rbd.csi.ceph.com
I1006 11:38:05.847814   25589 server.go:114] listening for CSI-Addons requests on address: &net.UnixAddr{Name:"/tmp/csi-addons.sock", Net:"unix"}
I1006 11:38:05.857632   25589 mount_linux.go:283] Detected umount with safe 'not mounted' behavior
I1006 11:38:05.858045   25589 rbd_attach.go:231] nbd module loaded
I1006 11:38:05.858143   25589 rbd_attach.go:245] kernel version "5.15.0-48-generic" supports cookie feature
I1006 11:38:05.968026   25589 rbd_attach.go:261] rbd-nbd tool supports cookie feature
I1006 11:38:05.968631   25589 server.go:126] Listening for connections on address: &net.UnixAddr{Name:"//csi/csi.sock", Net:"unix"}
I1006 11:38:06.292155   25589 utils.go:195] ID: 1 GRPC call: /csi.v1.Identity/GetPluginInfo
I1006 11:38:06.301526   25589 utils.go:199] ID: 1 GRPC request: {}
I1006 11:38:06.301565   25589 identityserver-default.go:39] ID: 1 Using default GetPluginInfo
I1006 11:38:06.301696   25589 utils.go:206] ID: 1 GRPC response: {"name":"rook-ceph.rbd.csi.ceph.com","vendor_version":"v3.7.0"}
I1006 11:38:06.690380   25589 utils.go:195] ID: 2 GRPC call: /csi.v1.Node/NodeGetInfo
I1006 11:38:06.690934   25589 utils.go:199] ID: 2 GRPC request: {}
I1006 11:38:06.691050   25589 nodeserver-default.go:51] ID: 2 Using default NodeGetInfo
I1006 11:38:06.691461   25589 utils.go:206] ID: 2 GRPC response: {"accessible_topology":{},"node_id":"worker0"}
vagrant@worker0:~/ceph-csi$ uname -r
5.15.0-48-generic
vagrant@worker0:~/ceph-csi$ uname -a
Linux worker0 5.15.0-48-generic #54-Ubuntu SMP Fri Aug 26 13:26:29 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
vagrant@worker0:~/ceph-csi$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.1 LTS
Release:	22.04
Codename:	jammy
vagrant@worker0:~/ceph-csi$

am not able to reproduce it, i dont see any error message in csi logs.

[gattytto]

I do here