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Date: Thu, 10 Feb 2011 17:08:43 -0200
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Arun Sharma <arun@sharma-home.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-perf-users@vger.kernel.org
Subject: Re: 2.6.37 kernel warning in perf_events code
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Em Wed, Feb 09, 2011 at 06:50:09PM -0800, Arun Sharma escreveu:
> [ Not sure if this is known and fixed in newer kernels. My machine
> becomes unusable after this warning triggers ]
> 
> perf record -g -p <pid> cs -o csw.data -- sleep 3

What kernel are you using? Peter, rings any bells?

- Arnaldo
 
> Feb 7 15:28:36 localhost kernel: WARNING: at kernel/perf_event.c:1302
> task_ctx_sched_out+0x45/0x67()
> ..
> Feb 7 15:28:36 localhost kernel: [<ffffffff8103c60d>]
> warn_slowpath_null+0x15/0x17
> Feb 7 15:28:36 localhost kernel: [<ffffffff8109e3b6>]
> task_ctx_sched_out+0x45/0x67
> Feb 7 15:28:36 localhost kernel: [<ffffffff8109e3b6>]
> task_ctx_sched_out+0x45/0x67
> Feb 7 15:28:36 localhost kernel: [<ffffffff810a207f>]
> perf_event_exit_task+0xca/0x196
> Feb 7 15:28:36 localhost kernel: [<ffffffff810a207f>]
> perf_event_exit_task+0xca/0x196
> Feb 7 15:28:36 localhost kernel: [<ffffffff8103fb3f>] do_exit+0x2c5/0x6e6
> Feb 7 15:28:36 localhost kernel: [<ffffffff8103fb3f>] do_exit+0x2c5/0x6e6
> Feb 7 15:28:36 localhost kernel: [<ffffffff81040021>] complete_and_exit+0x0/0x1e
> Feb 7 15:28:36 localhost kernel: [<ffffffff81040021>] complete_and_exit+0x0/0x1e
> Feb 7 15:28:36 localhost kernel: [<ffffffff8100293b>]
> system_call_fastpath+0x16/0x1b
> Feb 7 15:28:36 localhost kernel: [<ffffffff8100293b>]
> system_call_fastpath+0x16/0x1b
> 
> 
> 1301
> 1302         if (WARN_ON_ONCE(ctx != cpuctx->task_ctx))
> 1303                 return;
> 
>  -Arun
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