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SubjectRe: 3.2rc1: bootup fails: DRHD: handling fault status reg 2
On 11/14/2011 06:53 PM, Arnd Hannemann wrote:
> Hi,
>
> Am 14.11.2011 23:33, schrieb Arnd Hannemann:
>
>> when trying to boot kernel 3.2rc1 on my thinkpad t510 I get an endless loop of errors:
>>
>> DRHD: handling fault status reg 2
>> DMAR: [DMA Read] Request device [0d:00.0] fault addr fffff000
>> DMAR: [fault reason 02] Present bit in context entry is clear
>>
>> screenshot can be found here:
>> http://arndnet.de/lkml/screenshot3.2rc1.jpg
>>
>> kernel 3.1.1 is booting up flawlessly.
>
> I must have inadvertently enabled CONFIG_INTEL_IOMMU_DEFAULT_ON in my config
> for 3.2-rc1.
>
> With disabled CONFIG_INTEL_IOMMU_DEFAULT_ON my thinkpad boots up again.
> Not sure if this is expected?

No, that's not supposed to happen. Can you post the output of "lspci
-vv"? Apparently that device 0d:00.0 is generating unexpected DMA
accesses for some reason.


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