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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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
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