linux-kernel - Re: [BUG] fault while using perf callchains in sparc64

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Message-ID: <20100401090608.GD5207@nowhere>
Date:	Thu, 1 Apr 2010 11:06:11 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [BUG] fault while using perf callchains in sparc64

On Mon, Mar 29, 2010 at 03:32:08PM -0700, David Miller wrote:
> From: Frederic Weisbecker <fweisbec@...il.com>
> Date: Tue, 30 Mar 2010 00:21:34 +0200
> 
> > $ ldd /usr/bin/as
> > 	libopcodes-2.18.0.20080103.so => /usr/lib/libopcodes-2.18.0.20080103.so (0xf7ec4000)
> > 	libbfd-2.18.0.20080103.so => /usr/lib/libbfd-2.18.0.20080103.so (0xf7e14000)
> > 	libc.so.6 => /lib/libc.so.6 (0xf7ca0000)
> > 	/lib/ld-linux.so.2 (0xf7efc000)
> 
> Ok, same here.
> 
> > The last kernel I know that don't have such problems is 2.6.31-rc6
> > May be I should bisect?
> 
> Hmmm, since you know a good and bad point, yes a bisect
> might be the best way to proceed here.
> 
> It might be quicker if you first test 2.6.32 and 2.6.33
> and then use the results of that to guide your bisect.
> 
> Anyways, if you narrow it down to a commit I should be
> able to fix this quickly.
> 
> Thanks!


I actually can't. It works well on a backup 2.6.31-rc6 kernel
but when I build a new one of this same version, the problem
happens again. And I don't have the config of the one that works
(and no /proc/config.gz as well).

So I suspect this is something that happens with some specific
configs only.

Anyway, once I get more clues about this, I'll tell you.

Thanks.

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