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

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Date:	Tue, 12 Jul 2011 08:33:17 +0200
From:	Sander Eikelenboom <linux@...elenboom.it>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.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

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.

--
Sander


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