[Xen-devel] Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

["Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>]

On Mon, Jul 11, 2011 at 03:30:22PM -0400, Konrad Rzeszutek Wilk wrote:
> > 
> > Hmmm...  Does the stall repeat about every 3.5 minutes after the first 
> > stall?
> 
> Starting Configure read-only root support...
> [   81.335070] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} 
> (detected by 3, t=60002 jiffies)
> [   81.335091] sending NMI to all CPUs:
> [  261.367071] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} 
> (detected by 3, t=240034 jiffies)
> [  261.367092] sending NMI to all CPUs:
> [  441.399066] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 0} 
> (detected by 3, t=420066 jiffies)
> [  441.399089] sending NMI to all CPUs:

OK, then the likely cause is something hanging onto the CPU.  Do the later
stalls also show stack traces?  If so, what shows up?

(Documentation/RCU/stallwarn.txt for more info on this.)

> > 
> > One thing to try would be to disable CONFIG_RCU_FAST_NO_HZ.  I wouldn't
> > expect this to have any effect, but might be worth a try.  It is really
> 
> Did not help.

Well, I guess it met my expectations.  Thank you for trying it!

                                                        Thanx, Paul

> > intended for small battery-powered systems.
> > 

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