linux-kernel - Re: Floating point exception by perf record

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Message-ID: <20100407103855.GC3908@ghostprotocols.net>
Date:	Wed, 7 Apr 2010 07:38:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Floating point exception by perf record

Em Wed, Apr 07, 2010 at 05:32:24PM +0900, Hitoshi Mitake escreveu:
> On 04/06/10 03:31, Arnaldo Carvalho de Melo wrote:
> > Em Sun, Apr 04, 2010 at 05:10:57PM +0900, Hitoshi Mitake escreveu:
> > [root@...pio ~]# perf lock report | head -3
> >    Warning: Error: expected 'data' but read 'overwrite'
> >                  ID                 Name   acquired  contended
> total wait (ns)   max wait (ns)   min wait (ns)
> >
> > 0xffff8800029d4b28&q->lock          0          0               0
> 0               0
> > [root@...pio ~]#
> >
> > My system details:
> >
> > [root@...pio ~]# uname -a
> > Linux doppio.ghostprotocols.net 2.6.34-rc3-tip+ #1 SMP Mon Apr 5
> 13:49:42 BRT 2010 x86_64 x86_64 x86_64 GNU/Linux
> > [root@...pio ~]# rpm -q newt
> > newt-0.52.10-4.fc11.x86_64
> > [root@...pio ~]#
> >
> > No segfaults here :-\
> >
> > - Arnaldo
> >
> 
> I tested perf lock trace and got a similar error (but different).
> % sudo ./perf lock trace
>   Fatal: reading input file (size expected=3 received=0)
> It seems that perf.data is broken :( I'll search the cause.

Take a look at:

http://git.kernel.org/?p=linux/kernel/git/acme/linux-2.6.git;a=summary

"perf" branch, there is at least one fix there, the "overwrite" one.

- Arnaldo
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