ata_dev_acpi_handle - NULL ptr deref (bug #48211)

ata_dev_acpi_handle - NULL ptr deref (bug #48211)

[Dan van der Ster]

Hi,
I filed this bug report:
   https://bugzilla.kernel.org/show_bug.cgi?id=48211
and Alan suggested I mail this list.

I cannot boot 3.6 with acpi on using this hardware:
    Shuttle sp35p2, Intel P35, AHCI SATA
    disks attached via an external SATA port multiplier

I get a NULL ptr deref in ata_dev_acpi_handle with 3.6, but not with 3.5.4.
Using acpi=off convinces 3.6 to boot.

I'm new to kernel debugging and don't have a serial console, but I did
manage to slow the printk's and take a video. See around 2:00 here:
    http://www.youtube.com/watch?v=WNkQCnfc56g&t=2m1s

Please let me know if you require any further info to debug this.

Best Regards, Dan

Re: ata_dev_acpi_handle - NULL ptr deref (bug #48211)

[Aaron Lu]

On 10/03/2012 07:30 PM, Dan van der Ster wrote:
> Hi,
> I filed this bug report:
>    https://bugzilla.kernel.org/show_bug.cgi?id=48211
> and Alan suggested I mail this list.
> 
> I cannot boot 3.6 with acpi on using this hardware:
>     Shuttle sp35p2, Intel P35, AHCI SATA
>     disks attached via an external SATA port multiplier
> 
> I get a NULL ptr deref in ata_dev_acpi_handle with 3.6, but not with 3.5.4.
> Using acpi=off convinces 3.6 to boot.

Attached a patch on the bugzilla page, can you please give it a try?
Thanks.

-Aaron

> 
> I'm new to kernel debugging and don't have a serial console, but I did
> manage to slow the printk's and take a video. See around 2:00 here:
>     http://www.youtube.com/watch?v=WNkQCnfc56g&t=2m1s
> 
> Please let me know if you require any further info to debug this.
> 
> Best Regards, Dan
> --
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Re: ata_dev_acpi_handle - NULL ptr deref (bug #48211)

[Dan van der Ster]

On Mon, Oct 8, 2012 at 5:13 AM, Aaron Lu <aaron.lu@intel.com> wrote:
> On 10/03/2012 07:30 PM, Dan van der Ster wrote:
>> Hi,
>> I filed this bug report:
>>    https://bugzilla.kernel.org/show_bug.cgi?id=48211
>> and Alan suggested I mail this list.
>>
>> I cannot boot 3.6 with acpi on using this hardware:
>>     Shuttle sp35p2, Intel P35, AHCI SATA
>>     disks attached via an external SATA port multiplier
>>
>> I get a NULL ptr deref in ata_dev_acpi_handle with 3.6, but not with 3.5.4.
>> Using acpi=off convinces 3.6 to boot.
>
> Attached a patch on the bugzilla page, can you please give it a try?

Your patch fixes the problem.

Thanks,
Dan


> Thanks.
>
> -Aaron
>