[lxc-users] debugging lxcfs?

[Fajar A. Nugraha]

I'm having intermittent problem with lxcfs, used by vivid (with
systemd-sysv installed) container. For example, just now "lxc-start -n
-v" and "lxc-console -n v -t console" stuck on

[  OK  ] Reached target Basic System.
         Starting System Logging Service...

"lxc-stop -k -n v" (from another terminal) hangs, and only returns
after I run "pkill lxcfs".

After that "lxc-start -n -v" followed by "lxc-console -n v -t console"
works normally (lxcfs was restarted automatically by upstart).

This has happened several times, although the point of hang is
different each time. Sometimes it occurs during container start,
sometimes it's during container shutdown. In all cases killing both
lxcfs and the container allows the container to be restarted
correctly.

Host is ubuntu 14.10, lxc 1.1.0+master~20150224-0137-0ubuntu1~utopic,
lxcfs 0.6-0ubuntu1~ubuntu14.10.1~ppa1 from ppa:ubuntu-lxc/daily

Any ideas how to debug this problem?

-- 
Fajar