I was running the pretty new kernel on CentOS 6.2, so I thought there 
might be some API incompatible issues. So I freshly installed Fedora 16 
on the same system, and built and run  3.2.18-rt29 on it. I got the same 
cpu stalls again.

dmesg showed that it occured at the same place menu_select()


The cpu stall seems always happening when I trying to run some KVM 
guests. There might be something not working together between  KVM and 
the RT patch?

Thanks!

Dong

PS. dmesg attached.


On 6/27/12 11:22 PM, Dong Liu wrote:
> 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.