linux-kernel - Re: Bus error on make allyesconfig, kernelbuild with HEAD

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Message-ID: <20101107170700.GA22684@merkur.ravnborg.org>
Date:	Sun, 7 Nov 2010 18:07:00 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ben Gamari <bgamari.foss@...il.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Christoph Egger <siccegge@...fau.de>,
	linux-kernel@...r.kernel.org,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>
Subject: Re: Bus error on make allyesconfig, kernelbuild with HEAD

On Sun, Nov 07, 2010 at 11:44:13AM -0500, Ben Gamari wrote:
> On Sat, 6 Nov 2010 17:24:26 +0100, Sam Ravnborg <sam@...nborg.org> wrote:
> > Took a quick look.
> > Does the following patch fix it?
> > 
> > if m == p then we will stay in the while look looking for a space.
> > I did not audit all of the code - there may be other issues..
> > 
> P.S. Sorry for the noise
> 
> Looks like something very odd is happening here. Seems like stat is
> giving us the wrong size. As seen below, ls reports the file size to be
> 5247 whereas st.stat indicates a size substantially larger than
> that. Output from make with attached patch applied:
> 
> $ ls -l scripts/basic/.fixdep.d
> -rw-r--r-- 1 bgamari bgamari 5247 2010-11-07 11:35 scripts/basic/.fixdep.d
> $ make V=1
> In file included from /usr/local/angstrom/arm/arm-angstrom-linux-gnueabi/usr/include/stdlib.h:903,
>                  from scripts/basic/fixdep.c:112:
> /usr/local/angstrom/arm/arm-angstrom-linux-gnueabi/usr/include/bits/stdlib.h:65: warning: no previous prototype for ‘ptsname_r’
> file=scripts/basic/.fixdep.d
> st.size=2ad5f6cecb36

Interesting and valueable information!

Looks like fstat() failed for some odd reason
Could you try to check the return value of fstat().

If it retruns less than 0 then print out errno (preferable using perror()).

	Sam
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