linux-kernel - Re: perf, percpu: panic in account

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Message-ID: <20130812092353.GC27162@twins.programming.kicks-ass.net>
Date:	Mon, 12 Aug 2013 11:23:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	paulus@...ba.org, Ingo Molnar <mingo@...nel.org>,
	acme@...stprotocols.net, Tejun Heo <tj@...nel.org>,
	cl@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, trinity@...r.kernel.org
Subject: Re: perf, percpu: panic in account_event

On Mon, Aug 05, 2013 at 05:19:18PM -0400, Sasha Levin wrote:
> Hi all,
> 
> While fuzzing with trinity inside a KVM tools guest running latest -next kernel,
> I've stumbled on the following spew.
> 
> It seems to happen on the following line in account_event():
> 
> 	if (event->attr.freq)
> 		atomic_inc(&per_cpu(perf_freq_events, cpu));  <--- here
> 

Right, Frederic even send a fix for this already. I suppose holidays got
in the way of getting it merged quickly though, sorry for that.

Merged his fix, will hopefully get it into tip soon.
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