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SubjectRe: 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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