On Tue, Oct 06, 2015 at 08:37:59PM +0200, Andreas Hartmann wrote: > But there is another problem w/ 4.3-rc2: Starting a VM w/ PCIe > passthrough doesn't work any more. I'm getting the attached null pointer > dereference and the machine hangs. Weird, probably a do_detach call for a device that is already detached. Anyway, I can't reproduce this here on my two AMD IOMMU machines. Can you please boot the machine with amd_iommu_dump on the kernel command line and send me dmesg after boot? Also, which device are you trying to attach to the guest (pci bus/device/function)? Output of lspci might also be helpful. Thanks, Joerg -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel