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

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Subject: Re: [Xen-users] kernel panic PCI-DMA: Random memory would be DMAed
From: Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date: Thu, 18 Oct 2007 19:33:06 +0100
Cc: Zachary Richmond <zak@xxxxxxxxxxx>
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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?


> 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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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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