From: Alistair John Strachan <alistair@devzero.co.uk>
To: "Zdenek Kabelac" <zdenek.kabelac@gmail.com>
Subject: Re: Sysrq+B doesn't work on my box
Date: Fri, 1 Aug 2008 22:17:53 +0100
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Cc: "Jeremy Fitzhardinge" <jeremy@goop.org>,
       "Henrique de Moraes Holschuh" <hmh@hmh.eng.br>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
       Avi Kivity <avi@qumranet.com>
References: <c4e36d110807310645n3ff6e61j17414433c5aee030@mail.gmail.com> <c4e36d110808010622w74d61378ud9624a6ea38357a4@mail.gmail.com> <c4e36d110808011325q612d57dcnfe99e6ef42b1c4ae@mail.gmail.com>
In-Reply-To: <c4e36d110808011325q612d57dcnfe99e6ef42b1c4ae@mail.gmail.com>
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> 2008/8/1 Zdenek Kabelac <zdenek.kabelac@gmail.com>:
> > 2008/8/1 Alistair John Strachan <alistair@devzero.co.uk>:
> >> On Friday 01 August 2008 10:54:19 Zdenek Kabelac wrote:
> >>> 2008/7/31 Jeremy Fitzhardinge <jeremy@goop.org>:
> >>> > Zdenek Kabelac wrote:
> >>>
> >>> I'll probably try to bisect  rc.sysinit script to check what is the
> >>> first command
> >>> that breaks the reboot  - but if there is any idea what should I test
> >>> first.?
> >>
> >> Are you using modules? Maybe a driver is loaded and this upsets the BIOS
> >> somehow? If that was the case, the driver wouldn't be loaded in an
> >> init=/bin/sh situation, as you described before.
> >
> > Yes - except as I've checked the exactly same modularized kernel
> > running Debian on the same box
> > has no boot problem.
>
> Ok - idea with checking loaded modules was actually the right way to a
> very quick discovery that KVM loaded in my Fedora are the source of
> troubles - without them the second mystery is also a history :)
>
> So - is it normal, that loaded KVM modules eliminate emergency reboot
> (bug or feature)?

Obviously not :-) Added Avi to CC.

Avi, Zdenek is having a problem on his T61 where the Alt-SysRq-B emergency 
reboot mechanism stops working after he loads the KVM module. Any ideas?

-- 
Cheers,
Alistair.
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