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[Xen-devel] Kernel panic - not syncing : Question from Xen newbie


I'm new to Xen and just installed using the instructions from the website. I'm
having Fedora Core Linux distribution. The CPU is a Intel P4 2.4 GHz processor.
Xen installation on dom0 works properly. Then, I want to create a new domain
using the simple example shown in the Xen documentation website. I'm getting a
kernel panic error, and can't figure out how to proceed. I've gone over the
mailing list archive, but could'nt find a solution for this. Any pointer or help
is greatly appreciated.

Here's the ouput when I try to create a new domain:


# xm create -c /etc/xen/xmexample1 vmid=1
Using config file "/etc/xen/xmexample1".
Started domain ExampleDomain, console on port 9612
************ REMOTE CONSOLE: CTRL-] TO QUIT ********
Linux version 2.6.9-xenU (root@xxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 3.3.3
20040412 (Red Hat Linux 3.3.3-7)) #1 Wed Dec 1 23:57:09 CST 2004
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000004000000 (usable)
64MB LOWMEM available.
DMI not present.
Built 1 zonelists
Kernel command line:  root=/dev/hda3 ro 4
Initializing CPU#0
PID hash table entries: 512 (order: 9, 8192 bytes)
Xen reported: 2386.624 MHz processor.
Using tsc for high-res timesource
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 62508k/65536k available (1553k kernel code, 2988k reserved, 432k data,
92k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz stepping 07
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... disabled
NET: Registered protocol family 16
Initializing Cryptographic API
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Xen virtual console successfully installed as tty
Event-channel device installed.
Starting Xen Balloon driver
xen_blk: Initialising virtual block device driver
Using anticipatory io scheduler
xen_net: Initialising virtual ethernet driver.
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 4096 bind 8192)
NET: Registered protocol family 1
NET: Registered protocol family 17
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:194] >
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:195] <
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:194] >
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:195] <
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:194] >
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:195] <
ioctl 00005310 not supported by Xen blkdev
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:194] >
[XEN:vbd_update:drivers/xen/blkfront/blkfront.c:195] <
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(3,3)
 <0>Rebooting in 1 seconds..



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