[lxc-users] LXCFS and ProcPS Interaction Issue

[Robert Pendell]

First some basic information so you know my environment...
Host: Linode
OS: Ubuntu 14.04.2
Kernel: Host supplied 4.0.1 -- also tested against PV-Grub loaded 4.1-RC4
Container Privilage: Unprivileged.
shinji at icarus:/proc> apt-cache policy lxcfs
lxcfs:
  Installed: 0.7-0ubuntu2~ubuntu14.04.1~ppa1
  Candidate: 0.7-0ubuntu2~ubuntu14.04.1~ppa1
  Version table:
 *** 0.7-0ubuntu2~ubuntu14.04.1~ppa1 0
        500 http://ppa.launchpad.net/ubuntu-lxc/daily/ubuntu/
trusty/main amd64 Packages
        100 /var/lib/dpkg/status

I literally just noticed this today.  When LXCFS is started and
running ProcPS throws a Floating Point Exception.  I do not know why
this is the case.  Oddly enough stopping LXCFS on the host and
restarting the container makes the bug go away.  Ideas?  Anything I
can test to isolate?

LXCFS Stopped
shinji at trusty-x86:~> ps u
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
shinji    1506  0.0  0.1   5816  3536 pts/4    Ss+  12:42   0:00 -bash
shinji    1519  0.0  0.1   5404  2684 pts/4    S+   12:42   0:00 tmux -2 -f /usr
shinji    1573  0.3  0.1   5696  3412 pts/5    Ss   12:42   0:00 /bin/bash
shinji    1679  0.0  0.1   5228  2340 pts/5    R+   12:42   0:00 ps u

LXCFS Started
shinji at trusty-x86:~> ps u
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
Signal 8 (FPE) caught by ps (procps-ng version 3.3.9).
shinji    1521  0.0ps:display.c:66: please report this bug
Floating point exception


Robert Pendell
shinji at elite-systems.org
A perfect world is one of chaos.
Keybase: http://keybase.io/shinji257