[Devel] Hang with fair cgroup scheduler (reproducer is attached.)

[KAMEZAWA Hiroyuki]

Hi,

While I was testing 2.6.24-rc5-mm1's fair group scheduler (with cgroup),
the system hangs. please confirm. it's reproducible on my box.

My test program is attached.

What happens:
  the system hangs. (panic ?)

Environ:
  ia64/NUMA 8CPU systems. 4 cpus per node.

How to reproduce:
  Compile attached one.
  # gcc -o reg reg.c
  Create group as following
  # mount -t cgroup none /opt/cgroup -o cpu
  # mkdir /opt/cgroup/group_1
  # mkdir /opt/cgroup/group_2
  
  And run attached program
  # ./reg 8 8

What 'reg' does;  
  usage : reg A B C...
  This program forks child process and assign 
     A of processes to group_1
     B of processes to group_2
     C of processes to group_3
  kick and waitpid all and repeat.

Thanks,
-Kame
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