Hi,

I'm running 3.4.3-rt11 and 3.2.18-rt29 on a system with Intel I7 860, I 
noticed that with hyperthread enabled, I'm getting kernel error

  rcu_preempt detected stalls on CPUs/tasks: { 3} (detected by 5, 
t=60002 jiffies)

But with hyperthread disabled, no such error.

Is preempt_rt not supposed to be used with hyperthread?

Thanks,

Dong

P.S. Full dmesg output attached.