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Re: [Xen-devel] Kernel 3.0 crashes 4.2 unstable on some hardware

On Sat, Jul 30, 2011 at 10:30:34PM +0200, Andi Reinbrech wrote:
> Hi,
> I have successfully set up a xen-unstable machine with kernel 3.0,
> on an old core2duo - running win2008 in hvm works 100%.  When trying
> on a new i5 machine though, the same kernel reboots the machine
> immediately after xen starts up dom0.
> It appears to be during the stage of graphics/framebuffer
> initialisation but the serial console does not show any details.  I
> have tried nomodeset with no changes.

Make sure you have 'sync_console' on your Xen stanza. And
"debug loglevel=10 initcall_debug" on your Linux stanza.

> What would the xen-gurus need from me to debug this in more detail?
> The machine (same xen 4.2) boots fine with the 2.6.32.xendom0
> kernel.  I was expecting at least an exception, core dump or freeze,
> but this reboot is quite strange and very hard to debug.

What is the video card you have? Do you have
CONFIG_DMAR in your .config? What does your lspci -vvv output look like?

> Thanks!
> Andi
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