[Xen-users] kernel panic PCI-DMA: Random memory would be DMAed

Zachary Richmond
Thu, 18 Oct 2007 18:23:56 -0000

I am attempting to run Xen 3.1.1 on a HP DL385 G2 box (opteron based system),
using Gentoo.  The machine will boot, and I can login and edit files etc, but
as soon as I do anything more intensive such as copying files off a cdrom
(making me think it is a cciss driver problem) or running make, I get the
following :

	kernel panic not syncing: PCI-DMA: Random memory would be DMAed

Searching on this doesn''t come up with much except the source code
where this
error message is written out.  The comment there indicates there is an IOMMU
problem, but I am not sure where to go from there. I am pretty sure it is not a
hardware issue since, when booting with a non-xen kernel and the same file
system, no problem.  Anyone have any ideas or run into this problem before?

As a side note, I have two of these boxes which are identical, and I have
successfully installed XenExpress on one of them, in the hopes of finding
something there.

Thanks,

	Zak


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