linux-kernel - Re: Sysrq+B doesn't work on my box

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Date:	Fri, 1 Aug 2008 22:17:53 +0100
From:	Alistair John Strachan <alistair@...zero.co.uk>
To:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
Cc:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Henrique de Moraes Holschuh" <hmh@....eng.br>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...ranet.com>
Subject: Re: Sysrq+B doesn't work on my box

> 2008/8/1 Zdenek Kabelac <zdenek.kabelac@...il.com>:
> > 2008/8/1 Alistair John Strachan <alistair@...zero.co.uk>:
> >> On Friday 01 August 2008 10:54:19 Zdenek Kabelac wrote:
> >>> 2008/7/31 Jeremy Fitzhardinge <jeremy@...p.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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