On Fri, 2008-09-26 at 17:47 +0300, Muli Ben-Yehuda wrote: > The way to debug this is to figure out why device 00:1f.2 is trying to > read from DMA address fffbf000 and does not have permission to do > so. This could be indicative of a driver bug where it is programming > the device to read from some buffer that has not been allocated > through the DMA API and thus does not have a valid IOMMU mapping, or a > hardware quirk where the device tries to read from memory without host > involvement. The former is much more likely. The same is probably true for the iwlagn case which was > [ 4184.617392] DMAR:[DMA Read] Request device [03:00.0] fault addr fa946000 > [ 4184.617393] DMAR:[fault reason 06] PTE Read access is not set > [ 4184.644081] iwlagn: Microcode HW error detected. Restarting. and indeed matches experience from myself and Marcel that DMA bugs seem to lurk. johannes
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