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

Mark Williamson
Thu, 18 Oct 2007 18:33:06 -0000

Hi Zak,

Could you please post this report, plus details of the full error message to
the xen-devel list.  My guess would be that you''ve got a driver which
is
interacting badly with Xen''s memory management.

What kernel are you using?

Cheers,
Mark

> 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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> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users



--
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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