[lxc-users] LXCFS and ProcPS Interaction Issue

[Serge Hallyn]

Quoting Robert Pendell (shinji at elite-systems.org):
> 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?

Can you build 0.9.0 from the wily sources, just to make sure this isn't
somethign fixed upstream?

Also, if you can run lxcfs under gdb and get stack trace when it crashes
that woudl be helpful.

> 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
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