linux-kernel - Re: [PATCH RFC tip/core/rcu 09/28] rcu: Document failing tick as cause of RCU CPU stall warning

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Message-ID: <20111103132550.GX2287@linux.vnet.ibm.com>
Date:	Thu, 3 Nov 2011 06:25:50 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org
Subject: Re: [PATCH RFC tip/core/rcu 09/28] rcu: Document failing tick as
 cause of RCU CPU stall warning

On Wed, Nov 02, 2011 at 08:07:50PM -0700, Josh Triplett wrote:
> On Wed, Nov 02, 2011 at 01:30:30PM -0700, Paul E. McKenney wrote:
> > One of lclaudio's systems was seeing RCU CPU stall warnings from idle.
> > These turned out to be caused by a bug that stopped scheduling-clock
> > tick interrupts from being sent to a given CPU for several hundred seconds.
> 
> Out of curiosity, what caused this bug?

If I remember correctly, software/configuration bugs in the clock code.

							Thanx, Paul

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