linux-kernel - Re: Fw: RCU boot debug patch

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Message-ID: <20110720160946.GA2313@linux.vnet.ibm.com>
Date:	Wed, 20 Jul 2011 09:09:46 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	RKK <kulkarni.ravi4@...il.com>
Cc:	kernelmail.jms@...il.com, linux-kernel@...r.kernel.org,
	cmm@...ibm.com
Subject: Re: Fw: RCU boot debug patch

On Wed, Jul 20, 2011 at 09:23:06PM +0530, RKK wrote:
> Hi Paul
> 
> >>
> >> On Wed, Jul 20, 2011 at 4:11 AM, Paul E. McKenney
> >> <paulmck@...ux.vnet.ibm.com> wrote:
> >> > Hello, Julie and Ravi,
> >> >
> >> > Although we arrived at a patch that worked for both of you, we never did
> >> > identify exactly which RCU callback (or other issue) that was causing
> >> > the problem.  It would be good to do this in case there is some other
> >> > problem lurking that might bite us in the future.  Mingming has therefore
> >> > put together the following diagnostic patch which should identify the
> >> > callbacks, please see below.
> >> >
> >> > So could you please run this and let us know what you find?  There should
> >> > at least be a message for artificial_callback().
> >> >
> >>
> >>  Do i need to  apply this patch on today's Linus master or on -rc7 ?
> >
> > Please do not use -rc7, as that would reproduce your hang.  Linus master
> > tree would be best, but -rc7 with the fix applied would work fine as well.
> >
> 
> Ok. will apply against Linus Master tree and get back to you sometime
> later tonight.

Thank you, Ravi!

							Thanx, Paul
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