Hi, we have the same issue on a Nvidia Jetson Nano with kernel 4.9.337 (the latest from Nvidia). After applying PREMPT_RT patches, cgroups cpuset.cpus cannot be set anymore: # get parent mems and cpus: > cat /sys/fs/cgroup/cpuset/cpuset.mems && cat /sys/fs/cgroup/cpuset/cpuset.cpus 0 0-3 # create child and gather inital mems and cpus > mkdir /sys/fs/cgroup/cpuset/test > cat /sys/fs/cgroup/cpuset/test/cpuset.mems && cat /sys/fs/cgroup/cpuset/test/cpuset.cpus <empty> <empty> # set and read mems and cpus > echo 0 > /sys/fs/cgroup/cpuset/test/cpuset.mems > echo 0-3 > /sys/fs/cgroup/cpuset/test/cpuset.cpus > cat /sys/fs/cgroup/cpuset/test/cpuset.mems && cat /sys/fs/cgroup/cpuset/test/cpuset.cpus 0 <empty> This leads to the issue, that no process can be attached: > echo $$ > /sys/fs/cgroup/cpuset/test/tasks bash: echo: write error: No space left on device Because docker uses this mechanism, we are not able to start any container. I assume it's because no CPU can be assigned. Do you have any idea what could be the reason for this and how this could be solved? Unfortunately, upgrading the kernel is not really an option because 4.9 is the latest supported kernel from Nvidia. Best regards Markus
