linux-kernel - Re: INFO: task rcu_kthread:6 blocked for more than 120 seconds.

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Date:	Thu, 13 Jan 2011 12:41:35 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Russell King <rmk@....linux.org.uk>
Cc:	Linux Kernel List <linux-kernel@...r.kernel.org>
Subject: Re: INFO: task rcu_kthread:6 blocked for more than 120 seconds.

On Thu, Jan 13, 2011 at 08:05:26PM +0000, Russell King wrote:
> On Wed, Jan 12, 2011 at 02:22:19PM -0800, Paul E. McKenney wrote:
> > Does the following patch help?
> 
> Yes it does, thanks.
> 
> Tested-by: Russell King <rmk+kernel@....linux.org.uk>
> 
> > commit 70ce43253a4465211a9c51e33d56a417c759a718
> > Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Date:   Wed Jan 12 14:18:11 2011 -0800
> > 
> >     rcu: avoid pointless blocked-task warnings
> >     
> >     If the RCU callback-processing kthread has nothing to do, it parks in
> >     a wait_event().  If RCU remains idle for more than two minutes, the
> >     kernel complains about this.  This commit changes from wait_event()
> >     to wait_event_interruptible() to prevent the kernel from complaining
> >     just because RCU is idle.
> >     
> >     Reported-by: Russell King <rmk@....linux.org.uk>
> 
> Please add '+kernel' in there, thanks.

Done!  FWIW, I copied the original from my email agent.

							Thanx, Paul
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