linux-kernel - Re: percpu related boot crash on x86 (was: Linux 2.6.38-rc1)

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Message-ID: <20110119231116.GA3896@elte.hu>
Date:	Thu, 20 Jan 2011 00:11:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: percpu related boot crash on x86 (was: Linux 2.6.38-rc1)


* Ingo Molnar <mingo@...e.hu> wrote:

> Btw., based on Peter's suggestion i tried the limit-bumping hack below - but it 
> did not help, the crash still triggers on 5%-10% of all randconfig bootups.

I'm now running tests with MAXSMP forcibly disabled - and there are no crashes after 
69 randconfig iteration. Before it would crash within 10 iterations.

So it seems the MAXSMP sizing tests triggers a new percpu regression.

Thanks,

	Ingo
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