Re: [Xen-devel] 4.2 unstable kernel restarting before booting OS kernel

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Sat, 2012-07-14 at 17:56 -0400, David Erickson wrote:
> Hi all-
> I'm using Ubuntu 12.04 and compiled unstable on revision
> 25605:9950f2dc2ee6, the compilation completed cleanly and I issued
> sudo make install.  I modified the grub entry for Xen 4.1 as follows:
> 
> menuentry 'Ubuntu GNU/Linux, with Xen 4.2-unstable and Linux 3.2.19'
> --class ubuntu --class gnu-linux --class gnu --class os --class xen {
>       insmod part_msdos
>       insmod ext2
>       set root='(hd0,msdos1)'
>       search --no-floppy --fs-uuid --set=root 
> 77928457-0585-4dac-bc8d-d99d346dff02
>       echo    'Loading Xen 4.2-unstable ...'
>       multiboot       /xen-4.2-unstable.gz placeholder
>       echo    'Loading Linux 3.2.19 ...'
>       module  /vmlinuz-3.2.19 placeholder root=/dev/mapper/xen-root ro
>       echo    'Loading initial ramdisk ...'
>       module  /initrd.img-3.2.19
> }
> 
> It starts booting the Xen kernel, but then reboots prior to booting
> the Linux kernel (as far as I can tell), without printing any sort of
> error that I can see.  Are there any suggestions on how to diagnose
> what is happening?

You can add "noreboot" to your hypervisor command line which will give
you the chance to see any messages printed at the last minute.

Or you can use a serial console
http://wiki.xen.org/wiki/XenSerialConsole

Ian.



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