Description of problem: When running iotop in a privileged docker container, it doesn't list any processes that are producing reads and/or writes to disk. Version-Release number of selected component (if applicable): iotop-0.6-6.fc23.noarch docker-1.9.1-2.git78bc3ea.fc23.x86_64 How reproducible: Always Steps to Reproduce: 1. System is based on Fedora-Cloud_Atomic-x86_64-23.iso, with tree 23.29 deployed. 2. On host, btrfs check <dev>, and also btrfs scrub start. So there should be at least one btrfs process running with the attached strace, producing IO. 2. docker run --net=host -v /dev:/dev --privileged=true -it fedext /usr/sbin/iotop -d3 Actual results: No processes listed, see screen shot which shows there is read IO happening, but no processes are listed. Expected results: When run outside of docker the process listing without -o is rather lengthy, but this has only two processes neither of which are btrfs user space tool doing the check or scrub. I expect the same behavior in docker. Additional info: Started out here when it was crashing in docker, bug --net=host https://bugzilla.redhat.com/show_bug.cgi?id=1290691
Created attachment 1105172 [details] strace iotop -d3 The result of 'strace iotop -d' inside a docker container run with command 'docker run --net=host -v /dev:/dev --privileged=true -it fedext /bin/bash' while the host was running 'btrfs check /dev/sda' and producing a bunch of read IO.
Created attachment 1105173 [details] iotop screenshot This is a screenshot of what I see with 'iotop -d3' when run in the privileged docker container. Notice a textUI anomaly that's weird: the 3rd row (black text on white), between the SWAPIN and COMMAND columns is this phantom IO> text. This phantom text doesn't appear when the command is run outside of a container.
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