linux-kernel - Re: RCU hang on cpu re-hotplug with 2.6.27rc8

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Date:	Tue, 7 Oct 2008 09:34:01 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, rjw@...k.pl,
	dipankar@...ibm.com, tglx@...uxtronix.de
Subject: Re: RCU hang on cpu re-hotplug with 2.6.27rc8

On Tue, Oct 07, 2008 at 05:49:39PM +0200, Andi Kleen wrote:
> > Hmmm...  I chased out a number of these when doing rcutree.
> > 
> > This with classic RCU or preemptable RCU?
> 
> classic.
> 
> > Could you please send me your .config file?
> 
> http://halobates.de/defconfig64

Thank you!  Hmmm, classic RCU, worked just fine in 2.6.27-rc7 with
Thomas's patch.  I was doing random onlines and offlines in a loop,
with about 3 seconds between each operation continuously for more than
ten hours, both x86 and Power.  So could you please try 2.6.27-rc7 with
Thomas's patch as follows?

http://www.rdrop.com/users/paulmck/patches/2.6.27-rc7-tglx-timer-1.patch

Failing that, I guess my next step would be to create tracing for
classic RCU to help figure out what RCU believes is preventing the
grace period from ending.

						Thanx, Paul
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