linux-kernel - Re: Perf Oops on 3.14-rc2

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Message-ID: <20140218105434.GO14089@laptop.programming.kicks-ass.net>
Date:	Tue, 18 Feb 2014 11:54:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Will Deacon <will.deacon@....com>
Cc:	Drew Richardson <drew.richardson@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnaldo <acme@...hat.com>, Pawel Moll <Pawel.Moll@....com>,
	Wade Cherry <Wade.Cherry@....com>
Subject: Re: Perf Oops on 3.14-rc2

On Tue, Feb 18, 2014 at 10:18:31AM +0000, Will Deacon wrote:
> On Mon, Feb 10, 2014 at 10:17:59PM +0000, Drew Richardson wrote:
> > While adding CPU on/offlining support during perf captures I get an
> > Oops both on ARM as well as my desktop x86_64. Below is a small
> > program that duplicates the issue.
> 
> [...]
> 
> FWIW I can reproduce this easily with -rc3 on my x86 laptop running
> hackbench in parallel with a tweaked version of your test (using
> _SC_NPROCESSORS_ONLN instead of _SC_NPROCESSORS_CONF and hotplugging off
> both CPU2 and CPU3).

-ENOTEST
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