linux-kernel - Re: [APIC] Kernel panic, rsync corruption, intel q8200, 2.6.28-rc8

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Date:	Tue, 10 Feb 2009 10:10:05 +0800
From:	yakui_zhao <yakui.zhao@...el.com>
To:	Sam Ruby <rubys@...ertwingly.net>
Cc:	Len Brown <lenb@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [APIC] Kernel panic, rsync corruption, intel q8200, 2.6.28-rc8

On Tue, 2009-02-10 at 07:50 +0800, Sam Ruby wrote:
> Len Brown wrote:
> >>> Do you have a second computer around with a serial port ? If yes, then
> >>> please add the following to the kernel command line:
> >>>
> >>>        earlyprintk=serial,ttyS0,115200 apic=debug
> >>>
> >>> and connect the serial ports with a null modem cable. Fire up a
> >>> terminal program on the second machine and capture the output.
> >> I do have a second computer, and went out and bought a null modem adapter for
> >> my serial cable and connected the two machines.  I've tried installing minicom
> >> and also connecting it to ttyS0 at 115200 baud on the second machine, but when
> >> I boot the first machine I don't see any output on the terminal.
> > 
> > /boot/grub/menu.lst:
> > 
> > serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
> > terminal --timeout=300 serial console
Do you have an opportunity to try the boot option of "acpi=off" as
suggested by Lenb?
     From the log it seems that there exists the following warning
message:
    >MP-BIOS bug: 8254 timer not connected to IO-APIC

    Can you try the following boot options?
    a. acpi_use_timer_override
    b. acpi_skip_timer_override
    c. noapic

    Thanks.
> > 
> > is what I use.
> > 
> > this will give you a prompt from grub even before the kernel boots
> > so you can select (and edit) your kernel via menu over the serial line
> > if you wish.
> 
> I've got that working now.  I used minicom on the remote machine, 
> capturing the output.  You can see me fumbling around, editing the 
> kernel command and booting here:
> 
> http://intertwingly.net/stories/2009/02/09/minicom.out
> 
> While it is difficult to make out what I did given line wrapping, etc, 
> what I started with was:
> 
> /boot/vmlinuz-2.6.27-11-generic 
> root=UUID=4fce230e-fe72-4685-aab0-294ef1c20efa ro noapic quiet splash
> 
> After editing, what I had was
> 
> /boot/vmlinuz-2.6.27-11-generic 
> root=UUID=4fce230e-fe72-4685-aab0-294ef1c20efa ro quiet splash 
> earlyprintk=serial,ttyS0,115200 apic=debug
> 
> As you can see, the last line I saw was "Starting up ...", after which 
> point the "MP-BIOS bug: 8254 timer not connected to IO-APIC" etc output 
> appeared on the monitor that is directly connected to the machine being 
> booted (i.e., this text did not appear on the minicom session).
> 
> > If this doesn't work, then the kernel earlyprintk is unlikely to work 
> > also.
> 
> At the moment, it looks like it works, but earlyprintk does not work for 
> me, at least not on Ubuntu 8.10, kernel 2.6.27-11-generic.
> 
> > Note that there may be some BIOS SETUP options related to the serial port 
> > -- worth checking.
> > 
> > Also, in minicom, be sure to turn off HW flow control
> > 
> > there is a fancy serial console document someplace on this,
> > probably at http://tldp.org/
> 
> As I have managed to get grub to talk to the serial console, I did not 
> explore these options further.  Please let me know if there is something 
> in particular I should explore.
> 
> > good luck,
> > -Len
> 
> - Sam Ruby
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