[CRIU] docker_cr.sh, error on dump

[J F]

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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