[PATCH 0/6][lxc][v3] Link LXC with USERCR

[Daniel Lezcano]

Sukadev Bhattiprolu wrote:
> lxc-checkpoint, lxc-restart in the LXC source tree are currently stubs.
> Following set of patches, when applied to LXC and built with USERCR as
> described below, enable enable lxc-checkpoint and lxc-restart of some
> simple containers

[ ... ]

> 3. Checkpoint/restart a simple LXC container
> 
> 	$ lxc-execute --name foo --rcfile lxc-no-netns.conf -- /bin/sleep 1000
> 
> 	$ lxc-checkpoint --name foo --image /root/lxc-foo.ckpt
> 
> 	$ lxc-stop --name foo
> 
> 	$ lxc-restart --name foo --image /root/lxc-foo.ckpt

Finally, using ckpt-v20-dev, I succeeded to checkpoint sleep but when I 
restart, I got the error:

<4534>number of tasks: 2
<4534>number of vpids: 0
<4534>total tasks (including ghosts): 2
<4534>pid 2: inherit sid 0
<4534>pid 2: creator set to 1
<4534>====== TASKS
<4534>	[0] pid 1 ppid 0 sid 0 creator 0
<4534>	[1] pid 2 ppid 1 sid 0 creator 1
<4534>............
<4534>task[0].vidx = -1
<4534>task[1].vidx = -1
<4534>new pidns with init
<4534>forking child vpid 1 flags 0x321
<4534>task 1 forking with flags 20020011 numpids 1
<4534>task 1 pid[0]=0
<4535>====== PIDS ARRAY
<4535>[0] pid 1 ppid 0 sid 0 pgid 0
<4535>[1] pid 2 ppid 1 sid 0 pgid 0
<4535>............
Error: /dev/ptmx must be a link to /dev/pts/ptmx
<4534>forked child vpid 4536 (asked 1)
root task exited status 0

What can I do to prevent this error ?

Thanks
   -- Daniel