linux-kernel - Re: perf-related lockup on 3.11

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Message-ID: <alpine.DEB.2.10.1309190906220.31380@vincent-weaver-1.um.maine.edu>
Date:	Thu, 19 Sep 2013 09:10:07 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Dave Jones <davej@...hat.com>
Subject: Re: perf-related lockup on 3.11

On Thu, 19 Sep 2013, Andi Kleen wrote:

> Vince Weaver <vincent.weaver@...ne.edu> writes:
> 
> > On Wed, 11 Sep 2013, Vince Weaver wrote:
> >
> >> 
> >> I got this hard lockup running my perf_fuzzer on 3.11 on a core2.
> >> I guess I should try to reproduce it on linus-git but was hoping
> >> I could wait until -rc1 before trying that.
> >
> > OK, I can also lock up 3.12-rc1 using the perf_fuzzer.  Last message
> > logged is below.
> 
> If it's easily reproducible and a regression, could you perhaps bisect it?

It's not necessarily easy to reproduce.  It shows up eventually, but it 
varies a bit.

It's also unclear whether it is a regression or not.  It only started 
appearing because I already got fixed the 5 or so other bugs that the 
fuzzer would trigger first.  So bisecting will be a pain because older 
kernels would have to be patched and the patches don't necessarily apply 
cleanly further back.

I'm working on seeing if I can get a reproducible trace that I can work 
with, but there's a lot of other stuff going on right now so it's semi low 
priority until I can spare a machine from doing 3.12-rc1 validation tests.

Vince
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