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

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Message-ID: <20150317141051.GC23123@twins.programming.kicks-ass.net>
Date:	Tue, 17 Mar 2015 15:10:51 +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 Sat, Feb 28, 2015 at 01:14:42PM +0100, Jiri Olsa wrote:
> hum, I dont see the locking is a problem.. 

Well that validate stuff iterates the sibling list, and we're not
holding any of the requisite locks to do so. So I think we also need my
patch.

Agreed that its unlikely that this will be causing Vince's problem
though.

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