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

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Message-ID: <20150304103231.GE16203@krava>
Date:	Wed, 4 Mar 2015 11:32:31 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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 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 think it's in addition.. Peter?

> 
> 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.

thanks,
jirka
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