linux-kernel - Re: [Bug #11989] Suspend failure on NForce4-based boards due to chanes in stop

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Message-ID: <20081112090508.GA14329@osiris.boeblingen.de.ibm.com>
Date:	Wed, 12 Nov 2008 10:05:08 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Oleg Nesterov <oleg@...hat.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [Bug #11989] Suspend failure on NForce4-based boards due to
	chanes in stop_machine

On Tue, Nov 11, 2008 at 09:34:51AM -0800, Paul E. McKenney wrote:
> On Tue, Nov 11, 2008 at 08:45:23AM -0800, Paul E. McKenney wrote:
> > On Tue, Nov 11, 2008 at 05:14:01PM +0100, Heiko Carstens wrote:
> > > > > Could you please apply the following debug patch (due to Jiangshan and
> > > > > myself)?  Then you should be able to build with CONFIG_RCU_TRACE,
> > > > > then mount debugfs after boot, for example, on /debug.  This will
> > > > > create a /debug/rcu directory with three files, "rcucb", "rcu_data",
> > > > > and "rcu_bh_data".  Since you are still able to log in, could you
> > > > > please send the contents of these three files?
> > > > > 
> > > > > 							Thanx, Paul
> > > > 
> > > > This time with the patch actually attached...  Thanks to Peter Z.
> > > > for alerting me to my omission.
> > > 
> > > Well, your patch doesn't apply on git head. However I used preemptible
> > > RCU instead and had tracing enabled.
> > 
> > Were you using preemptible RCU earlier as well?  Raphael was using
> > classic RCU.  Don't get me wrong, all problems need fixing, just trying
> > to make sure I understand where the problems are occurring.

Indeed, my fault. I just try to reproduce a cpu hotplug bug with classic RCU
and cpu hotplug stress test, but no luck so far.
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