Hi I'm getting the following error message in when booting rhel 3 es as a domu under fc4 as a dom0. can anyone please help me to figure it out? Total HugeTLB memory allocated, 0 VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) SELinux: Registering netfilter hooks Initializing Cryptographic API ksign: Installing public key data Loading keyring - Added public key 42BD35A990375F72 - User ID: Red Hat, Inc. (Kernel Module GPG key) vesafb: abort, cannot reserve video memory at 0x0 vesafb: abort, cannot ioremap video memory 0x0 @ 0x0 Trying to free nonexistent resource <00000000-ffffffff> vesafb: probe of vesafb.0 failed with error -5 isapnp: Scanning for PnP cards... isapnp: No Plug & Play device found Failed to obtain physical IRQ 8 Real Time Clock Driver v1.12 Linux agpgart interface v0.101 (c) Dave Jones PNP: No PS/2 controller found. Probing ports directly. i8042.c: No controller found. Unable to handle kernel NULL pointer dereference at virtual address 00000078 printing eip: c01aed96 *pde = ma 00000000 pa 55555000 [<c01062fa>] force_evtchn_callback+0xa/0x10 [<c014058f>] module_remove_driver+0x1f/0x30 [<c02449cf>] bus_remove_driver+0x7f/0xc0 [<c0244f80>] driver_unregister+0x10/0x20 [<c0240d6c>] i8042_pnp_exit+0x3c/0x40 [<c0404f4c>] i8042_init+0x18c/0x1c0 [<c04047e6>] serio_init+0x6 My config is: kernel ="/boot/vmlinuz-2.6.11-1.1369_FC4xen0" memory = 400 name = "rhel-3-es" nics = 1 disk = ['phy:cciss/c0d0p2,sda1,w'] root = "/dev/sda1 ro and my /etc/fstab in the domu is: /dev/sda1 / ext3 defaults 1 1 none /dev/pts devpts gid=5,mode=620 0 0 none /proc proc defaults 0 0 none /dev/shm tmpfs defaults 0 0 /dev/cciss/c0d0p6 swap swap defaults 0 0 Thanks Dan