Kernel 3.0 crashes 4.2 unstable on some hardware

Kernel 3.0 crashes 4.2 unstable on some hardware

[Andi Reinbrech]

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.

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.

Thanks!
Andi

Re: Kernel 3.0 crashes 4.2 unstable on some hardware

[Konrad Rzeszutek Wilk]

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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