linux-kernel - Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

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Message-ID: <20110710214639.GP6014@linux.vnet.ibm.com>
Date:	Sun, 10 Jul 2011 14:46:39 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	julie Sullivan <kernelmail.jms@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: 3.0-rc kernels unbootable since -rc3

On Sun, Jul 10, 2011 at 09:30:58PM +0100, julie Sullivan wrote:
> > But maybe not that much thought.  My current guess is that your
> > configuration is somehow causing some RCU callbacks to be executed
> > during early boot, and that these callbacks are attempting to use kernel
> > features that are not yet initialized.  If my guess is correct, then
> > the reason that enabling RCU_BOOST makes things work is that it prevents
> > RCU callbacks from executing until after the scheduler is up and running.
> >
> > So I added another commit to the jms.2011.07.07a branch in the -rcu
> > git tree.  If my guesses are correct, this will allow your system to
> > boot, possibly emitting a warning on the way up.  When you get a chance
> > to try this out, please let me know how it goes.
> >
> >                                                        Thanx, Paul
> 
> Fantastic, now we boot perfectly!
> I also tried the same treatment on v3.0-rc5 and -rc6 (i.e. revert
> f8b7fc6b514f34a51875 and a46e0899eec7a3069bcad then add those
> 8 commits from the jms.2011.07.07a branch) with the same success.
> 
> Thanks for giving me back 3.0-rc4, -rc5 and -rc6!

Very cool!  Thank you very much for the testing -- I will put together an
upstreamable commit with your Tested-by.

							Thanx, Paul
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