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SubjectRe: [APIC] Kernel panic, rsync corruption, intel q8200, 2.6.28-rc8
yakui_zhao wrote:
> 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?

That also produces the "MP-BIOS bug" message and halts.

> 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

That also produces the "MP-BIOS bug" message and halts.

> b. acpi_skip_timer_override

That also produces the "MP-BIOS bug" message and halts.

> c. noapic

With that, I can boot, but I get data corruption problems. Data
corruption problems I don't see when using the same hardware but with
Microsoft Vista. More details can be found here:

I am willing to install new kernels on fresh hard drives, run diagnostic
programs and report the output, including capturing serial output. Is
there any data I can gather to help diagnose this problem?

> 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:
>> 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
>> 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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- Sam Ruby
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