cayuga

+1

Hi there, I have recently updated my unraid server (from 6.11.5) to 6.12.4, and i am now running into a pretty unique issue. Every time a new SSH session is created, a new cgroup is created. Unfortunately this new cgroup does not get cleaned up when the session is closed. I use SSH to run some icinga monitoring checks on the host. this adds up pretty fast, reaching the cgroup limit of 65535 within a few weeks. When the limit is reached, i cannot start new docker containers: docker: error response from daemon: failed to create shim task: oci runtime create failed: runc create failed: unable to start container process: unable to apply cgroup configuration: mkdir /sys/fs/cgroup/docker/XXX: no space left on device: unknown. Restarting the SSH Daemon does not appear to work, i have to restart the server to clear the defunct cgroups. The amount of cgroups can be viewed using: cat /proc/cgroups #subsys_name hierarchy num_cgroups enabled cpuset 0 52 1 cpu 0 52 1 cpuacct 0 52 1 blkio 0 52 1 memory 0 52 1 devices 0 52 1 freezer 0 52 1 net_cls 0 52 1 perf_event 0 52 1 net_prio 0 52 1 hugetlb 0 52 1 pids 0 52 1 All these cgroups appear as /sys/fs/cgroup/cXX: /sys/fs/cgroup# ls c1/ c15/ c20/ c4/ cgroup.controllers cgroup.threads io.stat c10/ c16/ c21/ c5/ cgroup.max.depth cpu.stat machine/ c11/ c17/ c22/ c6/ cgroup.max.descendants cpuset.cpus.effective memory.numa_stat c12/ c18/ c23/ c7/ cgroup.procs cpuset.mems.effective memory.reclaim c13/ c19/ c24/ c8/ cgroup.stat docker/ memory.stat c14/ c2/ c3/ c9/ cgroup.subtree_control elogind/ I have found one similar issue on the interwebs from 6 years ago: https://stackoverflow.com/questions/45690117/ubuntu-server-every-ssh-connect-creates-non-deleted-cgroup It appears to be a pretty fringe issue. I do not have any other servers to try and reproduce this. i don't know if this is the right place for this issue, i can imagine this may go way deeper into openSSH/docker itself than just the plugin. Any help is appreciated.