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From: Lin Ming <ming.m.lin@intel.com>
To: Vince Weaver <vweaver1@eecs.utk.edu>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@elte.hu>,
	Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [perf] overflow/perf_count_sw_cpu_clock crashes recent kernels
Date: Thu, 28 Jul 2011 10:39:47 +0800	[thread overview]
Message-ID: <1311820787.3938.1551.camel@minggr.sh.intel.com> (raw)
In-Reply-To: <CAF1ivSZkC71V+ownS+k0Qmi3S_HfETBkK3D+U4FYFZ=cojmoGg@mail.gmail.com>

On Thu, 2011-07-28 at 09:54 +0800, Lin Ming wrote:
> On Thu, Jul 28, 2011 at 2:51 AM, Vince Weaver <vweaver1@eecs.utk.edu> wrote:
> > Hello
> >
> >> With 3.0.0 the PAPI "overflow_allcounters" test reliably locks up my
> >> Nehalem system.
> >
> > I finally managed to narrow this down to a small test, which is attached.
> >
> > Basically measuring overflow on the perf::perf_count_sw_cpu_clock
> > event will potentially *lock up* your system from user-space.
> >
> > This seems to be a long standing bug.  It will quickly lock solid
> > my Nehalem test box on 3.0, 2.6.39 and 2.6.38.
> >
> > On a Core2 2.6.32 box the crash testing program will wedge and become
> > unkillable, but it doesn't actually kill the machine.

Hi, Vince

I re-tested current -tip tree(commit 0931941) and it works OK now.

$ ./oflo_sw_cpu_clock_crash 
Matrix multiply sum: s=27665734022509.746094
Total overflows: 3460

Could you also have a try the current -tip tree?

Lin Ming



  reply	other threads:[~2011-07-28  2:39 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-22 16:13 [perf] 3.0 overflow test locks up system Vince Weaver
2011-07-27 18:51 ` [perf] overflow/perf_count_sw_cpu_clock crashes recent kernels Vince Weaver
2011-07-28  1:54   ` Lin Ming
2011-07-28  2:39     ` Lin Ming [this message]
2011-07-28 18:47   ` Peter Zijlstra
2011-07-29  5:05     ` [stable] " Greg KH
2011-07-29 11:59       ` Peter Zijlstra
2011-08-02 16:35         ` Greg KH
2011-08-03 11:49           ` Peter Zijlstra

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