[CRIU] docker_cr.sh, error on dump

[Saied Kazemi]

Hello JF,

The error message in dump.log tells us that CRIU was trying to look up
a file by its mount id (74) but couldn't find it.  Since there is no
entry in the mount tree as printed in dump.log, I am not sure where it
got 74 from.  Does this happen every time?  What distro are you using?

You can specify -v when you run docker_cr.sh to enable the verbose
mode to see the actual CRIU command line that it invokes.  Also, once
you have created the container, save its /proc/<pid>/mountinfo before
checkpointing to compare with the mount tree as logged in the dump.log
file (they should match).

Sorry can't tell more at this point.

--Saied


On Tue, Jan 6, 2015 at 5:00 PM, J F <jgmb45 at gmail.com> wrote:
> Hello CRIU team,
>
> I'm following the example at the bottom of this link: http://criu.org/Docker
>
> I get an error when doing a dump "Unable to look up the 74 mount"
>
> I'm wondering if I'm overlooking something or don't have my setup correct.
>
> I'm using criu-1.4, but this also reproduces with the latest from main
> branch. Attached is the dump.log and information about my environment is
> below. Thank-you, J
>
> uname -r
> 3.16.0-28-generic
>
> ./criu --version
> Version: 1.4
>
> docker -v
> Docker version 1.4.1, build 5bc2ff8
>
>  ./criu check --ms
> Warn  (cr-check.c:192): Skipping unssuported PR_SET_MM_MAP
> Warn  (tun.c:55): Skipping tun support check
> Warn  (timerfd.c:44): timerfd: Skipping timerfd support check
> Warn  (cr-check.c:300): Skipping mnt_id support check
> Warn  (cr-check.c:672): Skipping unsupported AIO remap
> Looks good.
>
> Process tree
>  2789 ?        Ssl    0:00 /usr/bin/docker -d
>  6687 ?        Ss     0:00  \_ /bin/sh -c i=0; while true; do echo $i >>
> /foo; i
>  8677 ?        S      0:00      \_ sleep 3
>
> docker ps
> CONTAINER ID        IMAGE               COMMAND                CREATED
> STATUS              PORTS               NAMES
> fc083b2f6ba4        busybox:latest      "/bin/sh -c 'i=0; wh   43 minutes
> ago      Up 43 minutes                           ecstatic_albattani
>
> ./docker_cr.sh -c
> fc083b2f6ba4ec2e29518e5f3598f25a28372955002fe4e2c9d95463931502e4
> dump failed
>
>
>
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