[Bug 11602] Kernel Bug when attaching USB stick (amd64)

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ben.collins at ubuntu.com changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1




------- Additional Comments From ben.collins at ubuntu.com  2005-09-07 23:51 UTC -------
This looks like an amd64 bug. There's only three cases where this bug in traps.c
is triggered. First is a DMA data direction being DMA_NONE during mapping and
unmapping of some single page DMA transactions (would affect all arch's), and
another is when the addr/size of the DMA data is outside the range of the hw
that is using it (in this case the USB host controller).

Thing is that the DMA routines should only allow allocation within this range
(DMA allocations take the addr mask as an argument). So that would seem to me
that the amd64 iommu code is doing something wrong.

I need to find an upstream contact for this bug.

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