linux-kernel - Re: [PROBLEM] Multiple BUG: unable to handle kernel paging request

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Message-ID: <20090217181517.GA828@fourtheye.org>
Date:	Tue, 17 Feb 2009 18:15:17 +0000
From:	Bob Wilkinson <bob@...rtheye.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] Multiple BUG: unable to handle kernel paging request

On Mon, Feb 16, 2009 at 01:41:29PM -0800, Arjan van de Ven wrote:
> On Mon, 16 Feb 2009 21:10:12 +0000
> Bob Wilkinson <bob@...rtheye.org> wrote:
> 
> > Hello
> > 
> >      I have been having many problems with the stability of one of
> > my machines. It does have a lot of attached peripherals, and
> > regularly crashes. It does not always boot. I have attached as much
> > information as I know to.
> > 
> > There are multiple 
> > 
> > BUG: unable to handle kernel paging request 
> 
> you're using a rather old kernel; it might be better to report such an
> issue to your distribution instead.
> 
> 
> however, one thing to try is to put "mem=750M" on the kernel command
> line; if your bios lies to you about how much memory you have that
> would work around it.

Hi Arjan

Thanks for your suggestion. I added this to the end of the boot line in 
grub.conf. I needed to restart again today and saw this in the kern.log.

Feb 17 09:21:57 italy kernel: [    0.114545] ACPI: Core revision 20080321
Feb 17 09:21:57 italy kernel: [    0.123946] ACPI: setting ELCR to 0200 (from 0e00)
Feb 17 09:21:57 italy kernel: [    0.128008] weird, boot CPU (#0) not listedby the BIOS.
Feb 17 09:21:57 italy kernel: [    0.128008] SMP motherboard not detected.
Feb 17 09:21:57 italy kernel: [    0.128008] Local APIC not detected. Using dummy APIC emulation.
Feb 17 09:21:57 italy kernel: [    0.128008] SMP disabled
Feb 17 09:21:57 italy kernel: [    0.128008] Brought up 1 CPUs
Feb 17 09:21:57 italy kernel: [    0.128070] Total of 1 processors activated (1863.87 BogoMIPS).

I do find it weird that the BIOS does not list the one - and only
- CPU.

I will build a newer kernel from source and see how I get on with
that. I do suspect that I have some combination of intermittently
faulty hardware. I quite often have a locked up machine - sometimes
with three keyboard lights flashing, sometimes responding to
CTRL-ALT-SYSRQ commands - sometimes not...

> Arjan van de Ven 	Intel Open Source Technology Centre
> For development, discussion and tips for power savings, 
> visit http://www.lesswatts.org

Bob
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