[Devel] Freezer cgroup Failed

[Jerf gefera]

Dear there,
The self_checkpoint and self_restart are working now, but why external
checkpoint cannot work.I did it like the following two ways:
1)     $./onetask &
    $./checkpoint 4347 >img
    checkpoint: Device or resource busy
    (you may use 'ckptinfo -e' for more info)

And the content in the image file is "[Error at do_checkpoint:583][err
-16]Freezer cgroup failed"
2)     $./onetask &
      $.echo 4354 > /cgroup/0/tasks
    $echo FROZEN > /cgroup/0/freezer.state
    $./checkpoint 4354 > ckpt.image
    checkpoint: Device or resource busy
    (you may use 'ckptinfo -e' for more info)
And the content in the image file is "[Error at do_checkpoint:583][err
-16]Freezer cgoup failed"
The content in freezer.state is "FROZEN". I do not know what is wrong, can
anyone can give me a hand.
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