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[Xen-users] /dev/sda1 does not exist. Dropping to a shell!

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] /dev/sda1 does not exist. Dropping to a shell!
From: "Vincenzo Ampolo" <vincenzo.ampolo@xxxxxxxxx>
Date: Thu, 21 Sep 2006 11:19:32 +0200
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when i try to set up a DomU with the following configuration:
dir = /home/xen
debootstrap = 1
size = 4Gb
memory = 128Mb
swap = 128Mb
fs = ext3
dist = dapper
image = sparse
dhcp = 1
kernel = /boot/xen0-linux-2.6.16-11.1-generic
initrd = /boot/xen- modules-2.6.16-11.1-generic
mirror = http://archive.ubuntu.com/ubuntu/

and try to start it with:

root@ubuntu:/etc/xen# xm create dapperDomU.cfg -c
Using config file "dapperDomU.cfg".
Started domain dapperDomU
Linux version 2.6.16-11.1-generic (root@rothera) (gcc version 4.1.2 20060906 (prerelease) (Ubuntu 4.1.1-13ubuntu2)) #3 SMP Tue Sep 12 19:39:26 UTC 2006
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 0000000008800000 (usable)
0MB HIGHMEM available.
136MB LOWMEM available.
ACPI in unprivileged domain disabled
Built 1 zonelists
Kernel command line: ip=: root=/dev/sda1 ro
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 1024 (order: 10, 16384 bytes)
Xen reported: 2004.174 MHz processor.
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Software IO TLB disabled
vmalloc area: c9000000-fb7fe000, maxmem 33ffe000
Memory: 103964k/139264k available (1838k kernel code, 26968k reserved, 708k data, 184k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 4105.64 BogoMIPS (lpj=20528246)
Security Framework v1.0.0 initialized
Capability LSM initialized
Mount-cache hash table entries: 512
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
Checking 'hlt' instruction... OK.
Brought up 1 CPUs
checking if image is initramfs... it is
Freeing initrd memory: 21331k freed
Grant table initialized
NET: Registered protocol family 16
Brought up 1 CPUs
PCI: setting up Xen PCI frontend stub
ACPI: Subsystem revision 20060127
ACPI: Interpreter disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI: disabled
xen_mem: Initialising balloon driver.
PCI: System does not support PCI
PCI: System does not support PCI
IA-32 Microcode Update Driver: v1.14-xen <tigran@xxxxxxxxxxx>
audit: initializing netlink socket (disabled)
audit(1158829781.807:1): initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
PNP: No PS/2 controller found. Probing ports directly.
i8042.c: No controller found.
Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15 (usb?)
Failed to obtain physical IRQ 6
floppy0: no floppy controllers found
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: loaded (max 8 devices)
Xen virtual console successfully installed as tty1
Event-channel device installed.
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
mice: PS/2 mouse device common for all mice
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Using IPI No-Shortcut mode
XENBUS: Device with no driver: device/vbd/2049
XENBUS: Device with no driver: device/vbd/2050
XENBUS: Device with no driver: device/vif/0
Freeing unused kernel memory: 184k freed

** WARNING: Currently emulating unsupported memory accesses **
** in /lib/tls glibc libraries. The emulation is **
** slow. To ensure full performance you should **
** install a 'xen-friendly' (nosegneg) version of **
** the library, or disable tls support by executing **
** the following as root: **
** mv /lib/tls /lib/tls.disabled **
** Offending process: init (pid=1) **


Begin: Loading essential drivers... ...
Begin: Running /scripts/init-premount ...
Begin: Mounting root file system... ...
Begin: Running /scripts/local-top ...
Begin: Waiting for root file system... ...
ALERT! /dev/sda1 does not exist. Dropping to a shell!

BusyBox v1.1.3 (Debian 1:1.1.3-2ubuntu3) Built-in shell (ash)
Enter 'help' for a list of built-in commands.

/bin/sh: can't access tty; job control turned off

This is the configuration file:

root@ubuntu:/home/xen/domains/dapperDomU# cat /etc/xen/dapperDomU.cfg
# Configuration file for the Xen instance dapperDomU, created on
# Thu Sep 21 10:36:30 2006.

# Kernel + memory size
kernel = '/boot/xen0-linux-2.6.16-11.1-generic'
ramdisk = '/boot/xen-modules-2.6.16-11'
memory = '128'

# Disk device(s).
root = '/dev/sda1 ro'
disk = [ 'file:/home/xen/domains/dapperDomU/disk.img,sda1,w',
'file:/home/xen/domains/dapperDomU/swap.img,sda2,w' ]

# Hostname
name = 'dapperDomU'

# Networking
dhcp = 'dhcp'
vif = [ '' ]

# Behaviour


I've tried also when i substitute the DomU empty fstab with the Dom= one and i'm using the same kernel and initramfs image.

Does anyone know something about this issue?

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