linux-kernel - Re: Re: i686 hang on boot in userspace

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Message-ID: <20060725074107.GA4044@suse.de>
Date:	Tue, 25 Jul 2006 09:41:08 +0200
From:	Jens Axboe <axboe@...e.de>
To:	gmu 2k6 <gmu2006@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Re: i686 hang on boot in userspace

On Tue, Jul 25 2006, gmu 2k6 wrote:
> On 7/25/06, Jens Axboe <axboe@...e.de> wrote:
> >On Mon, Jul 24 2006, gmu 2k6 wrote:
> >> the problem I have with hangs is related to changes in CFQ and that
> >> CFQ is now the default. 2.6.17-git12 had the problem but booting
> >> it with elevator=deadline fixes the hang.
> >>
> >> symptoms encountered during git-bisecting between v2.6.17 and 
> >v2.6.18-rc1:
> >> A hang while starting network services
> >> B hang while trying to login
> >>   1 on remote console [not SSH] it hang after typing <uid><CR>
> >>   1 via OpenSSH it hang after typing <pwd><CR> when doing slogin 
> >root@<IP>
> >>
> >> A is the problem I got in the first place and this seems to be the
> >> case since 2.6.17-git11 definitely although git-bisect pointed me at
> >> the following
> >> changeset which is included since 2.6.17-git12:
> >>
> >> caaa5f9f0a75d1dc5e812e69afdbb8720e077fd3
> >> by Jens Axboe
> >> titled "[PATCH] cfq-iosched: many performance fixes"
> >>
> >> strange enough it also hangs with 2.6.17-git11 which did not include that
> >> one changeset yet.
> >
> >So perhaps your bisect isn't 100% trust worthy? Can you do a manual
> >-gitX bisect to see which 2.6.17-gitX introduced the problem?
> >
> >Also please put a serial console or similar on the machine, so you can
> >log + store the sysrq+t output.
> 
> well I didn't say that caa....fd3 is the exact change which broke it,
> just that it's related to 1) CFQ changes and 2) CFQ being the default
> now.
> I have a Remote Serial Console via HP's integrated Lights-Out Java
> Applet but am not sure how to enable serial console via kernel boot
> params (will try to find out).
> I will first try to find the 2.6.17-git* revision working before
> bisecting it against -git11 or git12.

Thanks, would be much appreciated to try and narrow it down to a
specific fix.

Are you seeing the hang on cciss?

-- 
Jens Axboe

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