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

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Message-ID: <alpine.DEB.2.11.1503021411020.17687@vincent-weaver-1.umelst.maine.edu>
Date:	Mon, 2 Mar 2015 14:13:25 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Jiri Olsa <jolsa@...hat.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	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, 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.

Vince

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