Re: Fw: RCU boot debug patch

From: Paul E. McKenney
Date: Wed Jul 20 2011 - 10:59:45 EST

On Wed, Jul 20, 2011 at 10:57:38AM +0530, RKK wrote:
> Hi paul,
> On Wed, Jul 20, 2011 at 4:11 AM, Paul E. McKenney
> <paulmck@xxxxxxxxxxxxxxxxxx> 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.

Thanx, Paul
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