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Re: [Xen-devel] pvops Domain 0 Creased when boot Xen-unstable on Ubuntu1

To: Bei Guan <gbtju85@xxxxxxxxx>
Subject: Re: [Xen-devel] pvops Domain 0 Creased when boot Xen-unstable on Ubuntu10.04
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Tue, 17 May 2011 16:34:37 +0100
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Andrei Warkentin <andreiw@xxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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On Tue, 2011-05-17 at 16:27 +0100, Bei Guan wrote:
> 2011/5/17 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
>         > menuentry "Ubuntu_Xen 4.2 (" {
>         > recordfail
>         > insmod ext2
>         > set root='(hd0,9)'
>         > search --no-floppy --fs-uuid --set
>         59c64afa-47a8-4a5f-a4cf-dbe3be20cc15
>         >         multiboot /boot/xen.gz dom0_mem=1024M loglvl=all
>         guest_loglvl=all
>         > sync_console console_to_ring com1=115200,8n1 console=com1
>         lapic=debug
>         > apic_verbosity=debug apic=debug iommu=off
>         > module /boot/vmlinuz- nopat
>         > root=UUID=59c64afa-47a8-4a5f-a4cf-dbe3be20cc15 ro
>         console=tty0
>         > console=ttyS0,115200n8 console=hvc0 earlyprintk=xen
>         nomodeset initcall_debug
>         > debug loglevel=10
>         > module /boot/initrd.img-
>         > }
>         >
>         > In the debug, there is message like this:
>         >
>         > Loading, please wait...
>         > mount: mounting none on /dev failed: No such device
>         So your /dev/sda is being seen. Not sure why the UUID hasn't
>         been read, but
>         you could do 'root=/dev/sdaX' where X is the correct root
>         partition.
>         This would replace the 'UUID=59...'.
> I just tried this. Because the /dev/sda9 is the root fs, so I used
> 'root=/dev/sda9' to replace the original one. But it also the same
> error as the following. Detailed is also attached.
> Loading, please wait...
> mount: mounting none on /dev failed: No such device

This is trying to mount something on /dev, presumably a TMPFS or
DEVTMPFS or similar, this fails which apparently cascades into not
finding the disk.

I suggest you have a dig into your initramfs and try and figure out what
specifically it is trying to do and what requirements your distro has
put on the kernel configuration.

You appear to be getting dumped into a debug shell within the initramfs
so you can quite easily have a poke around and see what's going on I


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