linux-kernel - Re: perf: fuzzer triggered CPU lockup

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Message-ID: <20150703100809.GF19282@twins.programming.kicks-ass.net>
Date:	Fri, 3 Jul 2015 12:08:09 +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>,
	Stephane Eranian <eranian@...il.com>, kan.liang@...el.com
Subject: Re: perf: fuzzer triggered CPU lockup

On Thu, Jul 02, 2015 at 11:31:15PM -0400, Vince Weaver wrote:
> On Thu, 2 Jul 2015, Vince Weaver wrote:
> 
> > The fuzzer just turned this up.  This is the first part; a huge amount of 
> > CPU lockup messages, rcu stalls, and spinlock lockup suspected messages 
> > followed beyond what I've posted here but eventually the machine recovered (?)
> 
> > [20602.134103]  [<ffffffff8102f676>] ? intel_pmu_drain_pebs_nhm+0x176/0x2e0
> 
> after a reboot I am still getting these, in addition to the other
> intel_pmu_drain_pebs_nhm related warning.  Do I need to try to bisect this 
> down?

I think I have a fairly good idea which patches to blame for that;
there's been a rework of the pebs code there. Let me go have a look.
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