[Devel] Problem: Device or resource busy

[Jerf gefera]

Hi all,
I am using CKPT V19, when I tried to test the checkpoint, there was a error:
1) using checkpoint_self, error message is: "not container initckpt: Invalid
argument", FAILED;
2) using external checkpoint, there are two situations, if I did it like
this
a)
$ ./test &
    [1] 3493
$ echo 3493 > /cgroup/0/tasks"  --------------------> FAILED, error message
is "echo: write error: Device or resource busy"
b)
$ ./loop &
$./checkpoint 3493 >loop.ckpt    --------------------->FAILED, error message
is
"checkpoint: Device or resource busy
(you may use 'ckptinfo -e' for more info)"

I do not know what is wrong,
Thank you very much..
Jefera
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