linux-kernel - Re: perf counter issue - WARN_ON_ONCE(!list_empty(&tsk->perf_counter_ctx.counter

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Message-ID: <20090515135604.GC16389@elte.hu>
Date:	Fri, 15 May 2009 15:56:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
Cc:	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Subject: Re: perf counter issue -
	WARN_ON_ONCE(!list_empty(&tsk->perf_counter_ctx.counter_list));


* Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:

> On Wed, May 13, 2009 at 10:24:33PM +0530, Srivatsa Vaddagiri wrote:
> > I am hitting this warning in kernel/exit.c (latest -tip code):
> > 
> > WARN_ON_ONCE(!list_empty(&tsk->perf_counter_ctx.counter_list));
> > 
> > I was using perf counters against a java benchmark.
> 
> Basically using perf counters as:
> 
> 	$ perf stat java ....

hm, is there a reproducer perhaps? Is there some class file i could 
run with specific parameters to reproduce it?

	Ingo
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