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From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>, Don Zickus <dzickus@redhat.com>
Subject: Re: perf_fuzzer crash on pentium 4
Date: Thu, 8 May 2014 09:40:12 +0400	[thread overview]
Message-ID: <20140508054012.GL8607@moon> (raw)
In-Reply-To: <alpine.DEB.2.10.1405080111280.9135@vincent-weaver-1.umelst.maine.edu>

On Thu, May 08, 2014 at 01:14:56AM -0400, Vince Weaver wrote:
> > 
> > There were a bug in p4 pmu Don (CC'ed) fixed not that long ago but I fear
> > not all corner cases might be covered yet.
> 
> I hit the NMI warnings somewhat often on Intel hardware (Haswell, Core2) 
> but it usually doesn't make the system unusable like it does on p4.
> 
> I can try to get a trace, although I'm not sure it will be useful.  I 
> spent a lot of time getting a reproducible test case for the same warnings 
> on core2 and it was unclear what the proble was and it was never fixed.
> 
> The messages look like this:
> 
> [ 2944.203423] Uhhuh. NMI received for unknown reason 31 on CPU 0.
> [ 2944.208006] Do you have a strange power saving mode enabled?
> [ 2944.208006] Dazed and confused, but trying to continue
> [ 2944.208006] Uhhuh. NMI received for unknown reason 21 on CPU 0.
> [ 2944.208006] Do you have a strange power saving mode enabled?
> [ 2944.208006] Dazed and confused, but trying to continue
> [ 2944.208006] Uhhuh. NMI received for unknown reason 31 on CPU 0.
> [ 2944.208006] Do you have a strange power saving mode enabled?
> [ 2944.208006] Dazed and confused, but trying to continue
> 
> repeating forever, system is unusable.

Vince, is it possible to get a trace which exactly events perf-fuzzed
pushed into the kernel? Maybe it would shed some light.

  reply	other threads:[~2014-05-08  5:40 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-06 15:42 perf_fuzzer crash on pentium 4 Vince Weaver
2014-05-06 15:46 ` Peter Zijlstra
2014-05-06 15:49   ` Cyrill Gorcunov
2014-05-06 16:05     ` Vince Weaver
2014-05-06 16:06       ` Cyrill Gorcunov
2014-05-06 16:11   ` Vince Weaver
2014-05-06 16:16     ` Cyrill Gorcunov
2014-05-06 17:56       ` Vince Weaver
2014-05-06 20:23 ` Cyrill Gorcunov
2014-05-06 21:30   ` Vince Weaver
2014-05-06 21:46     ` Cyrill Gorcunov
2014-05-07 16:46       ` Vince Weaver
2014-05-07 16:49         ` Cyrill Gorcunov
2014-05-07 16:58           ` Cyrill Gorcunov
2014-05-07 17:07             ` Vince Weaver
2014-05-07 18:24               ` Cyrill Gorcunov
2014-05-07 21:17                 ` Vince Weaver
2014-05-07 21:51                   ` Cyrill Gorcunov
2014-05-07 21:54                     ` Cyrill Gorcunov
2014-05-08  5:14                       ` Vince Weaver
2014-05-08  5:40                         ` Cyrill Gorcunov [this message]
2014-05-08  2:00   ` Don Zickus
2014-05-08  5:38     ` Cyrill Gorcunov
2014-05-08  7:37     ` Cyrill Gorcunov
2014-05-08  7:49       ` Cyrill Gorcunov
2014-05-08  8:02         ` Cyrill Gorcunov
2014-05-09 16:19           ` Vince Weaver
2014-05-09 16:30             ` Cyrill Gorcunov
2014-05-14 20:39             ` Cyrill Gorcunov
2014-05-15  5:31               ` Vince Weaver
2014-05-15 22:09                 ` Cyrill Gorcunov
2014-05-28 13:56 ` Pavel Machek
2014-05-28 14:06   ` Cyrill Gorcunov
2014-05-28 15:20     ` Peter Zijlstra
2014-05-28 15:43       ` Cyrill Gorcunov

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