From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752826AbcBOQxJ (ORCPT <rfc822;w@1wt.eu>);
	Mon, 15 Feb 2016 11:53:09 -0500
Received: from casper.infradead.org ([85.118.1.10]:33275 "EHLO
	casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751542AbcBOQxH (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 15 Feb 2016 11:53:07 -0500
Date: Mon, 15 Feb 2016 17:52:45 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Stephane Eranian <eranian@google.com>,
        LKML <linux-kernel@vger.kernel.org>, vince@deater.net,
        Andi Kleen <andi@firstfloor.org>, jolsa@redhat.com,
        Thomas Gleixner <tglx@linutronix.de>,
        Arnaldo Carvalho de Melo <acme@infradead.org>
Subject: Re: [RFC][PATCH 00/12] various perf fixes
Message-ID: <20160215165245.GM6357@twins.programming.kicks-ass.net>
References: <20160112101109.GC20997@gmail.com>
 <CACT4Y+Zb4VE5HiAvEubFU6W=+iXgoDB-1xCSd_r3MYGzbetMxQ@mail.gmail.com>
 <CACT4Y+bNJi8T031hgbh832f1G9cKofYDx8maH6zSS93KnUQJLw@mail.gmail.com>
 <CACT4Y+Zdn2i0bG3=ALRkm2_RwAJE9WTf9qYb=5vXfDtos8Hzgg@mail.gmail.com>
 <CACT4Y+bAqP78kMGG3QxNUEEVCqesW8PhpL5KS+8U8=D0C4F71A@mail.gmail.com>
 <20160114093529.GU6344@twins.programming.kicks-ass.net>
 <CACT4Y+Ym0TZLkmRrM0ZGgLpu8kqS-YjoWTMrvaLz=tx2tnyO3w@mail.gmail.com>
 <20160215162909.GJ6357@twins.programming.kicks-ass.net>
 <CACT4Y+bK64NAmVcbSSQWg1aC-=+3sjXsTd98pUqbd1JC92m=5w@mail.gmail.com>
 <CACT4Y+ZwzJTqfbG8wo8fx5sUFheUmPBADr4Y24s7k-LiO39xmw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CACT4Y+ZwzJTqfbG8wo8fx5sUFheUmPBADr4Y24s7k-LiO39xmw@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2012-12-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Feb 15, 2016 at 05:38:36PM +0100, Dmitry Vyukov wrote:
> Just to compensate the pain, here is what I've just got when
> re-enabled perf in my config :)
> 
> 2016/02/15 16:52:18 qemu-15: saving crash 'WARNING: CPU: 0 PID: 18465
> at kernel/events/core.c:2743 ctx_sched_in+0x255/0x17f0()' to
> crash-qemu-15-1455551538366997265
> 2016/02/15 16:54:02 qemu-17: saving crash 'WARNING: CPU: 0 PID: 1072
> at kernel/events/core.c:2743 ctx_sched_in+0x255/0x17f0()' to
> crash-qemu-17-1455551642205132730
> 2016/02/15 16:54:44 qemu-30: saving crash 'WARNING: CPU: 3 PID: 19858
> at kernel/events/core.c:2122 __perf_install_in_context+0x1c4/0x220()'
> to crash-qemu-30-1455551684741709699
> 2016/02/15 16:55:02 qemu-20: saving crash 'WARNING: CPU: 2 PID: 9873
> at kernel/events/core.c:226 event_function+0x359/0x3e0()' to
> crash-qemu-20-1455551702744185903

That looks like a splat every minute or so. I've now had it run for
almost 10 minutes and I've not seen anything except:

2016/02/15 17:26:25 local-0: saving crash 'not executing programs' to crash-local-0-1455553585720015733
2016/02/15 17:29:25 local-0: saving crash 'not executing programs' to crash-local-0-1455553765740119317
2016/02/15 17:32:25 local-0: saving crash 'not executing programs' to crash-local-0-1455553945767974819
2016/02/15 17:35:25 local-0: saving crash 'not executing programs' to crash-local-0-1455554125793957186

And those files are completely empty of useful.