Could you recheck with the current LXC (4.0.12) as the cgroup code was
reworked quite extensively.
** Changed in: lxc (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1813362
Title:
lxc-top flash error and blkio write is always zero
Status in lxc package in Ubuntu:
Incomplete
Bug description:
When running lxc-top as root it flashes the following error messages for
every container:
Unable to read cgroup item memory.memsw.usage_in_bytes
Unable to read cgroup item memory.memsw.limit_in_bytes
Here output showing bad blkio write
Container CPU CPU CPU
BlkIO Mem KMem
Name Used Sys User
Total(Read/Write) Used Used
ltcd-root 310.22 98.26 196.88 315.06
MiB(315.06 MiB/ 0.00 ) 688.64 MiB 83.09 MiB
ltcd-test 236.02 84.52 136.76 115.88
MiB(115.88 MiB/ 0.00 ) 384.39 MiB 31.89 MiB
TOTAL 2 of 2 546.24 182.78 333.64 430.94
MiB(430.94 MiB/ 0.00 ) 1.04 GiB 114.97 MiB
Doing an strace on lxc-top:
openat(AT_FDCWD,
"/sys/fs/cgroup/memory//lxc/ltcd-root/memory.memsw.usage_in_bytes",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
write(2, "Unable to read cgroup item memor"..., 55) = 55
openat(AT_FDCWD,
"/sys/fs/cgroup/memory//lxc/ltcd-root/memory.memsw.limit_in_bytes",
O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
write(2, "Unable to read cgroup item memor"..., 55) = 55
Here is copy /sys/fs/cgroup/memory/lxc/ltcd-root
mike@mike-desktop:/sys/fs/cgroup/memory/lxc/ltcd-root$ ls
cgroup.clone_children memory.limit_in_bytes
cgroup.event_control memory.max_usage_in_bytes
cgroup.procs memory.move_charge_at_immigrate
init.scope memory.numa_stat
memory.failcnt memory.oom_control
memory.force_empty memory.pressure_level
memory.kmem.failcnt memory.soft_limit_in_bytes
memory.kmem.limit_in_bytes memory.stat
memory.kmem.max_usage_in_bytes memory.swappiness
memory.kmem.slabinfo memory.usage_in_bytes
memory.kmem.tcp.failcnt memory.use_hierarchy
memory.kmem.tcp.limit_in_bytes notify_on_release
memory.kmem.tcp.max_usage_in_bytes system.slice
memory.kmem.tcp.usage_in_bytes tasks
memory.kmem.usage_in_bytes user.slice
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lxc-utils 3.0.3-0ubuntu1~18.04.1
ProcVersionSignature: Ubuntu 4.18.0-13.14~18.04.1-generic 4.18.17
Uname: Linux 4.18.0-13-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Fri Jan 25 15:56:04 2019
InstallationDate: Installed on 2018-02-23 (336 days ago)
InstallationMedia: Ubuntu-GNOME 16.04.3 LTS "Xenial Xerus" - Release amd64
(20170801)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: lxc
UpgradeStatus: Upgraded to bionic on 2018-10-21 (95 days ago)
mtime.conffile..etc.lxc.default.conf: 2019-01-24T17:40:41.527776
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