Date: Tue, 18 Feb 2014 11:01:46 +0000
From: Will Deacon <will.deacon@arm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Drew Richardson <Drew.Richardson@arm.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Arnaldo <acme@redhat.com>, Pawel Moll <Pawel.Moll@arm.com>,
        Wade Cherry <Wade.Cherry@arm.com>
Subject: Re: Perf Oops on 3.14-rc2
Message-ID: <20140218110145.GD4178@mudshark.cambridge.arm.com>
References: <20140210221758.GB11542@dreric01-Precision-T1600>
 <20140218101831.GB4178@mudshark.cambridge.arm.com>
 <20140218105434.GO14089@laptop.programming.kicks-ass.net>
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On Tue, Feb 18, 2014 at 10:54:34AM +0000, Peter Zijlstra wrote:
> 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

Sorry, I trimmed it from my reply since it's not especially concise. It's
inlined in the original post:

  http://lkml.kernel.org/r/20140210221758.GB11542@dreric01-Precision-T1600

Will
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