[CRIU] Unable to checkpoint LXC container

[Ross Boucher]

Apologies in advance if I'm asking in the wrong place. I'm trying to follow
the LXC setup instructions
from the wiki[1] and not having any luck. When I get to the actual
checkpoint step, it fails with this output:

    vagrant at vagrant: $ sudo lxc-checkpoint -D /tmp -v -n u1
    Checkpointing u1 failed.

I haven't been able to get any other information by setting the log level
or adding the verbose flag.
Running 'criu check --ms' gives me the following output:

    Warn  (cr-check.c:188): Skipping unssuported PR_SET_MM_MAP
    Warn  (tun.c:58): Skipping tun support check
    Warn  (timerfd.c:44): timerfd: Skipping timerfd support check
    Warn  (cr-check.c:296): Skipping mnt_id support check
    Warn  (cr-check.c:668): Skipping unsupported AIO remap
    Looks good.

I compiled criu from source, but haven't compiled a custom kernel, which I
believe is what's causing the
warnings? Checking my kernel configuration, the flags seem to match what is
asked for on the wiki[2].
I was able to get a really simple process checkpointed, following these
instructions[3].

Any pointers on where to look would be appreciated, thanks.

- Ross

[1] http://criu.org/LXC
[2] http://criu.org/Installation
[3] http://criu.org/Simple_loop
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