[Pkg-xen-devel] Bug#684661: Bug#684661: Bug#684661: Xen panic on boot

[Ian Campbell]

On Fri, 2012-08-17 at 12:50 +0100, Ian Campbell wrote:
> On Sun, 2012-08-12 at 17:25 +0200, Stephan Beyer wrote:
> > Package: xen-hypervisor-4.1-amd64
> > Version: 4.1.3~rc1+hg-20120614.a9c0a89c08f2-5
> > Severity: important
> > 
> > I updated from xen-hypervisor-4.0-amd64 to xen-hypervisor-4.1-amd64
> > and the system did not boot anymore (Xen panic).
> > A downgrade made the system work again.
> > I cannot paste the boot error messages but the main message was:
> > 
> > 	Xen BUG at pci_amd_iommu.c:33
> 
> The BUG is "BUG_ON ( bdf >= ivrs_bdf_entries );" and ivrs_bdf_entries
> has come from ACPI -- do you have the latest firmware in this machine?
> 
> I'm afraid that without some more information (e.g. a stack trace) I
> think this is going to be pretty hard to track down.
> 
> Can you either configure a serial console
> (http://wiki.xen.org/wiki/Xen_Serial_Console) or use the "noreboot"
> option on the hypervisor command line to capture a digital picture of
> the error.

Please add iommu=debug to the hypervisor command line too.

Ian.