More info on VP6 panics

More info on VP6 panics

[Ian Pilcher]

Background:  I get a kernel panic when I boot 2.4.2{2,3,4} with ACPI on
my dual-processor Abit VP6.  Compiling the kernel with CONFIG_DEBUG_SLAB
turned on allows it to boot, as does booting with "idle=poll".

I do not believe that the panic occurs anywhere in the ACPI code.  From
what I can tell, the transition to ACPI mode causes the idle thread on
the other processor to panic.

I believe that I have identified the line of code that triggers the
panic.  It is the actual transition to ACPI mode at
drivers/acpi/hardware/hwacpi.c, line 143.  If I insert an infinite loop
before the call to acpi_os_write_port, the boot process simply hangs.
If I move the loop below the call to acpi_os_write_port, I get the same
old panic message.

How can I debug this further?

Thanks!
-- 
========================================================================
Ian Pilcher                                        i.pilcher-Wuw85uim5zDR7s880joybQ@public.gmane.org
========================================================================



-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn

RE: More info on VP6 panics

[Yu, Luming]

>ve that the panic occurs anywhere in the ACPI 
> code.  From
> what I can tell, the transition to ACPI mode causes the idle thread on
> the other processor to panic.
> 
> I believe that I have identified the line of code that triggers the
> panic.  It is the actual transition to ACPI mode at
> drivers/acpi/hardware/hwacpi.c, line 143.  If I insert an 
> infinite loop
> before the call to acpi_os_write_port, the boot process simply hangs.
> If I move the loop below the call to acpi_os_write_port, I 
> get the same
> old panic message.
>

That experiment can only tell that there is no panic displayed on you
screen
before the infinite loop.

I did remember this error, but I cannot find out other emails about this
issue.
Did you file it on bugzilla.kernel.org? It will help us a lot.

Thanks,
Luming



-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn

Re: More info on VP6 panics

[Ian Pilcher]

Yu, Luming wrote:
> That experiment can only tell that there is no panic displayed on you
> screen
> before the infinite loop.

The panic isn't occurring in the ACPI code.  It's the idle thread on the
other processor that panics.

> Did you file it on bugzilla.kernel.org? It will help us a lot.

I've created bug #1908:

     http://bugzilla.kernel.org/show_bug.cgi?id=1908

-- 
========================================================================
Ian Pilcher                                        i.pilcher-Wuw85uim5zDR7s880joybQ@public.gmane.org
========================================================================



-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn