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. -- Cheers, Ben Green
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