From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zachary Richmond Subject: DL385 G2 - PCI-DMA: Random memory would be DMAed Date: Thu, 18 Oct 2007 15:29:44 -0500 Message-ID: <4717C238.9060106@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Mark suggested that I post this to the xen-devel list (I had orginally posted to xen-users): Original post: > 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. To answer Mark's question: > What kernel are you using? from gentoo: xen-sources-2.6.20-r6 Regarding the full error message, all I am getting is: kernel panic not syncing: PCI-DMA: Random memory would be DMAed since the machine is rebooting after that. There maybe somewhere else to get more detail, but beyond dmesg or messages I am not sure where else to look. Zak