linux-kernel - Re: INFO: possible circular locking dependency detected

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Message-ID: <20110714203336.GB2317@linux.vnet.ibm.com>
Date:	Thu, 14 Jul 2011 13:33:36 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dave Jones <davej@...hat.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: INFO: possible circular locking dependency detected

On Thu, Jul 14, 2011 at 03:38:28PM -0400, Dave Jones wrote:
> On Thu, Jul 14, 2011 at 12:34:12PM -0700, Paul E. McKenney wrote:
> 
>  > Thank you -- you were indeed running with CONFIG_PREEMPT and
>  > CONFIG_RCU_BOOST, which would be the case for the bug that Steven Rostedt
>  > found.  On reproducing, yes, it could be a bit tough, as the race window
>  > is rather narrow.  I could probably add delays to force the situation htat
>  > Steven found, but it would be hard to prove that this is your situation.
>  > 
>  > Dave, was your lockdep splat also with CONFIG_PREEMPT and
>  > CONFIG_RCU_BOOST?
> 
> yeah. which might explain why I haven't seen it since. (I usually have it
> disabled, but turn it on occasionally for a 'lets see what breaks' test)

OK, thanks for the info.  For the time being, I will assume that you
were seeing this same bug.

							Thanx, Paul
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