So apparently this is a known kernel issue. Solution is to write values into cpuset.mems and cpuset.cpus.
https://serverfault.com/questions/579555/cgroup-no-space-left-on-device Cheers, Ben On 03/09/2020 15:27, Ben Green wrote: > Hi all, > > We are starting to use LXC in production here, after solving our final > problem (inconsistent and disappearing cgroup space - Thread name > "Disappearing Cgroups" on this list) completely with the help of Serge > E. Hallyn. > > Now something odd has come up. I have one server on the Debian kernel > 4.19.0-9-amd64 and another on 4.19.0-10-amd64. On the 4.19.0-9-amd64 > kernel we cat this: > > # cat /sys/fs/cgroup/cpuset/forcontainers/tasks > 1216 > 5065 > 12372 > etc. > > But on the other one with the 4.19.0-10-amd64 we get this: > > # cat /sys/fs/cgroup/cpuset/forcontainers/tasks > > No output! Also on the 4.19.0-10-amd64 machine it is not possible to add > to the list of tasks: > > # echo $$ >> /sys/fs/cgroup/cpuset/forcontainers/tasks > -bash: echo: write error: No space left on device > > However, we've had this happen before, and thought that adding > 'swapaccount=1' to the grub command line arguments had fixed it. Seems > it hadn't. I'm not even sure therefore that this is consistent between > kernels. It appears it might be entirely random. > > Has anyone else experienced this phenomena? Any clues as to what might > be happening? > > It seems that the cgroup has a messed up mount, but it looks fine to me: > > cgroup on /sys/fs/cgroup/cpuset type cgroup > (rw,nosuid,nodev,noexec,relatime,cpuset) > > Remove and remake the /sys/fs/cgroup/cpuset/forcontainers directory and > the problem persists. > > > _______________________________________________ > lxc-users mailing list > lxc-users@lists.linuxcontainers.org > http://lists.linuxcontainers.org/listinfo/lxc-users -- Cheers, Ben Green
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