linux-kernel - Re: Linux 2.6.30.2: does not boot

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Message-Id: <200907210242.33602.wolfgang.walter@stwm.de>
Date:	Tue, 21 Jul 2009 02:42:33 +0200
From:	Wolfgang Walter <wolfgang.walter@...m.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kiko Piris <kernel@...ispons.net>,
	Damien Wyart <damien.wyart@...e.fr>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Linux 2.6.30.2: does not boot

On Tuesday 21 July 2009, Linus Torvalds wrote:
> 
> On Mon, 20 Jul 2009, Kiko Piris wrote:
> > > Just to clarify:
> > > 
> > >  - you literally have a _working_ 2.6.30.1 that you compiled yourself a 
> > >    few days ago.
> > 
> > That’s correct.
> > 
> > >  - But when you try to compile that same kernel _now_, it fails with an 
> > >    immediate reboot? And not just 2.6.30.2, but 2.6.30.1 does that too?
> > 
> > Also correct.
> > 
> > > That certainly implies something else than just the -fwrapv vs 
> > > -fno-strict-overflow thing.
> > 
> > Yes, as Marcel Beister pointed, it resulted some binutils bug.
> > Downgrading the package produced a perfectly bootable 2.6.30.2.
> 
> Ok, so it's been narrowed down to binutils. Good.
> 
> > > But we may be looking at two different issues, so maybe your "unable to 
> > > compile a working kernel" issue is different from the other reports.
> > 
> > Totally unrelated to other reports, and not a kernel bug, in fact.
> 
> Well, it's still not entirely clear that it's unrelated.
> 
> It seems that all the people involved are running Debian/sid, and I don't 
> think we have any firm confirmation yet that it's the compiler flag for 
> anybody. It was certainly the primary suspect, but maybe that was always 
> just a red herring guess.
> 
> Wolfgang hasn't actually tried to compile without the -fno-strict-overflow 
> flag yet, and maybe his hang is the same binutils bug.

Yes, it is.

I built with -fwrapv instead of  -fno-strict-overflow and without either, both 
fail to boot.

Downgrading binutils to those of debian/testing and the unmodified 2.6.30.2 
works.

So this seems to be indeed a problem with binutils in debian/sids.

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
Leiter EDV
Leopoldstraße 15
80802 München
Tel: +49 89 38196-276
Fax: +49 89 38196-144
wolfgang.walter@...m.de
http://www.studentenwerk-muenchen.de/
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