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

To: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: PROBLEM: 3.0-rc kernels unbootable since -rc3
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 11 Jul 2011 15:30:22 -0400
Cc: julie Sullivan <kernelmail.jms@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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> 
> 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.
> 

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