linux-kernel - Re: v3.3-rc1, regression introduced by "sched, nohz: Implement sched group, domain aware nohz idle load balancing" when unplugging CPUs.

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Date:	Mon, 23 Jan 2012 16:10:51 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>, tglx@...utronix.de,
	mingo@...e.hu, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, gregkh@...e.de, rjw@...k.pl
Subject: Re: v3.3-rc1, regression introduced by "sched, nohz: Implement sched
 group, domain aware nohz idle load balancing" when unplugging CPUs.

On Mon, Jan 23, 2012 at 10:00:49PM +0100, Peter Zijlstra wrote:
> On Mon, 2012-01-23 at 15:56 -0500, Konrad Rzeszutek Wilk wrote:
> > Not exactly sure how this patch does it, but with this git commit
> > 0b005cf54eac170a8f22540ab096a6e07bf49e7c, the Linux kernel crashes
> > if I try to hot unplug VCPUs to the first (initial) domain.
> > This is found using git bisection, and if I use the kernel compiled
> > with 69e1e811dcc436a6b129dbef273ad9ec22d095ce (the previous commit)
> > it works nicely. 
> 
> https://lkml.org/lkml/2012/1/19/463
> 
> is already on its way...

Oh, somehow I thought the mce check fixes were already in v3.3-rc1.
My apologies and will take that patch on a test-spin.
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