linux-kernel - Re: perf: fuzzer causes lockup in x86_pmu_event

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Message-ID: <20150317141118.GD23123@twins.programming.kicks-ass.net>
Date:	Tue, 17 Mar 2015 15:11:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: fuzzer causes lockup in x86_pmu_event_init()

On Tue, Mar 17, 2015 at 02:55:36PM +0100, Jiri Olsa wrote:
> On Mon, Mar 02, 2015 at 02:13:25PM -0500, Vince Weaver wrote:
> > On Sat, 28 Feb 2015, Jiri Olsa wrote:
> > 
> > > hum, I dont see the locking is a problem.. but looks like once
> > > the sibling becomes singleton event, we dont init its sibling_list
> > > 
> > > how about patch below.. compile tested ;-)
> > 
> > so this is instead of PeterZ's patch?
> > 
> > I'll start my test-machine fuzzing with this plus the infinite-interrupt 
> > fix and see what happens.  The machines do eventually trigger the issue
> > somwhat consistently but it can take up to a week before they hit it
> > so it's a tough one to test for.
> 
> I guess no news is good news in here..  ;-)
> 
> Peter, should I repost formal patch or you'll take it somehow

Yeah, please send with a proper changelog, I'll stuff it in someplace.
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