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

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Date:	Tue, 12 Jul 2011 07:05:46 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	julie Sullivan <kernelmail.jms@...il.com>,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

On Tue, Jul 12, 2011 at 08:33:17AM +0200, Sander Eikelenboom wrote:
> Monday, July 11, 2011, 9:30:22 PM, you 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:
> 
> >> 
> >> 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.
> >> intended for small battery-powered systems.
> >> 
> 
> Just as a note, i'm also seeing some stalls from domU's running a 3.0-rc kernel from you master tree (about 2 week old).
> But it seems the first occurrences are not as quick after being booted. Unfortunately i haven't got time to investigate more this week.

Should you get some time, providing the stack traces from the CPU stall
warnings would give me something to go on.  ;-)

							Thanx, Paul
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