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

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Message-ID: <20090515145144.GD13664@ghostprotocols.net>
Date:	Fri, 15 May 2009 11:51:44 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Srivatsa Vaddagiri <vatsa@...ibm.com>, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	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));

Em Fri, May 15, 2009 at 03:56:04PM +0200, Ingo Molnar escreveu:
> 
> * 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?

I'll try this with some java benchmarks we have, AMQP related, lets see
if I can reproduce it.

- Arnaldo
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