[Pkg-libvirt-maintainers] Bug#907440: libvirt-daemon: libvirtd spams host logs with `cant open .../memory.memsw.usage_in_bytes'

[Peter.Chubb at data61.csiro.au]

Package: libvirt-daemon
Version: 4.6.0-2
Severity: minor

Dear Maintainer,
I'm running lots of containerised systems using libvirt-lxc.  The systems run 
on a machine with more than 300Gb RAM, and no swap.  So I haven't enabled swap
accounting on the host kernel.

Every few seconds, I see a pair of messages like this in the logs for each
container on the system:
   Aug 28 12:00:21 hostname libvirtd[39700]: 2018-08-28 02:00:21.467+0000: 39707: error : virFileReadAll:1434 : Failed to open file '/sys/fs/cgroup/memory/machine/lxc-41320-containername.libvirt-lxc/memory.memsw.usage_in_bytes': No such file or directory
   Aug 28 12:00:21 hostname libvirtd[39700]: 2018-08-28 02:00:21.467+0000: 39707: error : virCgroupGetValueStr:819 : Unable to read from '/sys/fs/cgroup/memory/machine/lxc-41320-containername.libvirt-lxc/memory.memsw.usage_in_bytes': No such file or directory

I expect a single warning message when each container is started, then nothing.
The swap accounting files aren't magically going to appear without a reboot.

Peter C

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 4.16.0-2-amd64 (SMP w/56 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libvirt-daemon depends on:
ii  libacl1             2.2.52-3+b1
ii  libapparmor1        2.13-8
ii  libaudit1           1:2.8.3-1+b1
ii  libavahi-client3    0.7-4
ii  libavahi-common3    0.7-4
ii  libblkid1           2.32.1-0.1
ii  libc6               2.27-5
ii  libcap-ng0          0.7.9-1
ii  libcurl3-gnutls     7.61.0-1
ii  libdbus-1-3         1.12.10-1
ii  libdevmapper1.02.1  2:1.02.145-4.1
ii  libfuse2            2.9.8-2
ii  libgcc1             1:8.2.0-4
ii  libgnutls30         3.5.19-1
ii  libnetcf1           1:0.2.8-1+b2
ii  libnl-3-200         3.4.0-1
ii  libnl-route-3-200   3.4.0-1
ii  libnuma1            2.0.11-2.2
ii  libparted2          3.2-21+b1
ii  libpcap0.8          1.8.1-6
ii  libpciaccess0       0.14-1
ii  libsasl2-2          2.1.27~101-g0780600+dfsg-3.1
ii  libselinux1         2.8-1+b1
ii  libssh2-1           1.8.0-2
ii  libudev1            239-7
ii  libvirt0            4.6.0-2
ii  libxen-4.8          4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9
ii  libxenstore3.0      4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9
ii  libxml2             2.9.4+dfsg1-7+b1
ii  libyajl2            2.1.0-2+b3

Versions of packages libvirt-daemon recommends:
ii  libxml2-utils   2.9.4+dfsg1-7+b1
ii  netcat-openbsd  1.190-2
ii  qemu-kvm        1:2.12+dfsg-3

Versions of packages libvirt-daemon suggests:
pn  libvirt-daemon-driver-storage-gluster   <none>
pn  libvirt-daemon-driver-storage-rbd       <none>
pn  libvirt-daemon-driver-storage-sheepdog  <none>
pn  libvirt-daemon-driver-storage-zfs       <none>
ii  libvirt-daemon-system                   4.6.0-2
ii  numad                                   0.5+20150602-5

-- no debconf information

-- 
Dr Peter Chubb         Tel: +61 2 9490 5852      http://ts.data61.csiro.au/
Trustworthy Systems Group                     Data61, CSIRO (formerly NICTA)