Public bug reported:

I'm trying to get live-migration working, but it always fails. snapshot
--stateful fails too, so I'm starting there.

Currently getting messages similar to this in snapshot_dump:

(00.000127) Probing sock diag modules
(00.000229) Done probing
(00.008388) ========================================
(00.008439) Dumping processes (pid: 17469)
(00.008454) ========================================
(00.008468) Running pre-dump scripts
(00.008507)     [@<B4><EF> <C8>]
(00.011041) Error (action-scripts.c:60): One of more action scripts failed
(00.011087) Error (cr-dump.c:1621): Pre dump script failed with 32512!

The 'control character'-like values in the square brackets varies.

Host is Ubuntu 16.04.1 LTS

apt-cache policy lxc: Installed: (none)
apt-cache policy lxd: Installed: 2.0.4-0ubuntu1~ubuntu16.04.1
apt-cache policy criu: Installed: 2.0-2ubuntu3
apt-cache policy linux-image-extra-`uname -r`: Installed: 4.4.0-38.57
uname -a: Linux frp-vmhost4 4.4.0-38-generic #57-Ubuntu SMP Tue Sep 6 15:42:33 
UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Logs to follow.

** Affects: criu (Ubuntu)
     Importance: Undecided
         Status: New

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  lxc stateful snapshot failed with 32512

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