linux-kernel - Re: perf: hard fuzzer crash on 4.8-rc1

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Date:	Mon, 8 Aug 2016 20:30:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: hard fuzzer crash on 4.8-rc1

On Mon, Aug 08, 2016 at 01:57:28PM -0400, Vince Weaver wrote:
> Hello
> 
> I've finally had time to get the perf_fuzzer going on a 4.8-rc1 kernel on 
> a Haswell machine.
> 
> It locks up pretty quickly, I even have a marginally reproducible test case.
> The problem is the serial console only prints the following before giving 
> up:
> 
> [  637.250130] BUG: unable to handle kernel
> 
> About 10 times of triggering this, this is all I get.  Machine is fairly
> thoroughly locked at that point.
> 
> Any advice on how to debug this more?

I have this pending:

 lkml.kernel.org/r/20160804123724.GN6862@...ns.programming.kicks-ass.net

If that's not it, I'll go prod tomorrow.