Re: 3.2rc1: bootup fails: DRHD: handling fault status reg 2

[Robert Hancock]

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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