On Thu, 2010-01-21 at 11:13 -0600, Serge E. Hallyn wrote:
> The culprit is e2912009fb7b715728311b0d8fe327a1432b3f79
>     sched: Ensure set_task_cpu() is never called on blocked tasks
> 
> If you mount both the ns and cpuset cgroups with this patch applied,
> then doing clone with CLONE_NEWPID, CLONE_NEWNET, etc, you get the
> hang.  The hang is actually hard enough that alt-sysrq isn't helpful :)
> Still trying to figure out what is going on - Peter, any ideas offhand?


Does it replicate on x86_64 ?

/me looks at the NEWPID and NEWNET code


Hmm, I have an idea.. does it really need the ns cgroup stuff?

Let me try and come up with a debug patch...

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