This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1631406
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1631406
Title:
Wrong memory.stat values in container root cgroup
Status in linux package in Ubuntu:
Incomplete
Bug description:
1) Ubuntu 16.04.1 LTS
2) linux-image-4.4.0-41-generic, bug happens and first tested on
4.4.0-38, happens in all versions, including from 4.4.0-38 to 4.4.0-41
and possibly. See this bug on totally different xenial lts machines
3) What you expected to happen:
cat /sys/fs/cgroup/memory/lxc/containername/memory.stat should display
correct information
4) What happened instead
cat /sys/fs/cgroup/memory/lxc/containername/memory.stat shows incorrect
information
cat /sys/fs/cgroup/memory/memory.stat in container shows different information
lxc exec containername -- cat /sys/fs/cgroup/memory/memory.stat shows totally
different information from two above. Meanwhile cat
/sys/fs/cgroup/memory/lxc/containername/memory.usage_in_bytes is always correct.
5) mount | grep cgroup output:
tmpfs on /sys/fs/cgroup type tmpfs (rw,mode=755)
cgroup on /sys/fs/cgroup/systemd type cgroup
(rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup
(rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/perf_event type cgroup
(rw,nosuid,nodev,noexec,relatime,perf_event,release_agent=/run/cgmanager/agents/cgm-release-agent.perf_event)
cgroup on /sys/fs/cgroup/hugetlb type cgroup
(rw,nosuid,nodev,noexec,relatime,hugetlb,release_agent=/run/cgmanager/agents/cgm-release-agent.hugetlb)
cgroup on /sys/fs/cgroup/memory type cgroup
(rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup
(rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup
(rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/cpuset type cgroup
(rw,nosuid,nodev,noexec,relatime,cpuset,clone_children)
cgroup on /sys/fs/cgroup/freezer type cgroup
(rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/pids type cgroup
(rw,nosuid,nodev,noexec,relatime,pids,release_agent=/run/cgmanager/agents/cgm-release-agent.pids)
cgroup on /sys/fs/cgroup/blkio type cgroup
(rw,nosuid,nodev,noexec,relatime,blkio)
6) I was able to reproduce the bug on another machine where memory.stat for
container is correct after removing this packages, but it makes no sense at
all:
mountall:amd64 plymouth-theme-ubuntu-text:amd64 plymouth:amd64 upstart:amd64
Installing back didn't help.
7) memory.stat information for programs running in containers is
correct. Only memory.stat information for container root is incorrect.
Bug graphical representation:
https://cloud.githubusercontent.com/assets/6484506/19012936/9f19ff7a-87b2-11e6-9e68-889659663249.png
First chart is based on cat
/sys/fs/cgroup/memory/lxc/containername/memory.usage_in_bytes and cat
/sys/fs/cgroup/memory/lxc/containername/memsw_usage_in_bytes. Second chart
based on incorrect cat /sys/fs/cgroup/memory/lxc/containername/memory.stat
Possibly the same problems (bugs quite old):
https://issues.apache.org/jira/browse/MESOS-758
https://groups.google.com/forum/#!topic/linux.kernel/EwiYK53Itk8
Bug original sources:
https://github.com/firehol/netdata/issues/1019
https://github.com/lxc/lxd/issues/2422
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1631406/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
