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SubjectRe: race condition in schedule_on_each_cpu()
it's preemption mode related ,

on the 3.0.30-rt50, only config kernel with highest preemption level
(Fully Preemptible Kernel (RT)) in cpu preemption model
will cause problem

and even i use the "Preemptible Kernel" or "Preemptible Kernel
(Low-Latency Desktop)" the problem would not happen..

> I looked through the logs but the only worker depletion related
patches which pop up are around CPU hotplugs, so I don't think they
apply here. If the problem is relatively easy to reproduce && you can't
move onto a newer kernel, I'm afraid bisection probably is the best
option. Thanks!

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