[uml-user] could not boot

[guodonn <gu...@16...>]

Hi All. 
I am  new to UML, i download the linux-2.6.24-rc7.bz2 and FedoraCora5-x86-root_fs.bz2 from http://user-mode-linux.sourceforge.net/

Then i follow the instructions:

vang@localhost ~]$ ./UML/linux-2.6.24-rc7  ubda=FedoraCora5-x86-root_fs mem=256M
Core dump limits :
        soft - 0
        hard - NONE
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...OK
Checking advanced syscall emulation patch for ptrace...OK
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
  - /proc/mm...not found: No such file or directory
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found
UML running in SKAS0 mode
Adding 32944128 bytes to physical memory to account for exec-shield gap
Linux version 2.6.24-rc7-dirty (jd...@tp...) (gcc version 4.1.2 20070925 (Red Hat 4.1.2-27)) #97 Mon Jan 7 11:18:24 EST 2008
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 73005
Kernel command line: ubda=FedoraCora5-x86-root_fs mem=256M root=98:0
PID hash table entries: 2048 (order: 11, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 254908k available
Mount-cache hash table entries: 512
Checking for host processor cmov support...Yes
Checking for host processor xmm support...No
Checking that host ptys support output SIGIO...Yes
Checking that host ptys support SIGIO on close...No, enabling workaround
net_namespace: 64 bytes
Using 2.6 host AIO
NET: Registered protocol family 16
NET: Registered protocol family 2
Time: itimer clocksource has been installed.
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
Checking host MADV_REMOVE support...OK
mconsole (version 2) initialized on /home/Yang/.uml/bR5R3B/mconsole
Host TLS support detected
Detected host type: i386
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Initialized stdio console driver
Console initialized on /dev/tty0
console [tty0] enabled
Initializing software serial port version 1
console [mc-1] enabled
Couldn't stat "FedoraCora5-x86-root_fs" : err = 2
Failed to initialize ubd device 0 :Couldn't determine size of device's file
VFS: Cannot open root device "98:0" or unknown-block(98,0)
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)

EIP: 0073:[<00110416>] CPU: 0 Not tainted ESP: 007b:bff75dc4 EFLAGS: 00200246
    Not tainted
EAX: 00000000 EBX: 00000f51 ECX: 00000013 EDX: 00000f51
ESI: 00000f4d EDI: 00000003 EBP: bff75ddc DS: 007b ES: 007b
1985ae6c:  [<08069f14>] show_regs+0xb4/0xb9
1985ae98:  [<08058c6e>] panic_exit+0x25/0x3f
1985aeac:  [<080853e4>] notifier_call_chain+0x21/0x46
1985aecc:  [<0808547f>] __atomic_notifier_call_chain+0x17/0x19
1985aee8:  [<08085496>] atomic_notifier_call_chain+0x15/0x17
1985af04:  [<08070772>] panic+0x52/0xdd
1985af24:  [<08049a88>] mount_block_root+0xf8/0x10e
1985af78:  [<08049aea>] mount_root+0x4c/0x54
1985af9c:  [<08049bfe>] prepare_namespace+0x10c/0x133
1985afa4:  [<080497b3>] kernel_init+0x79/0x85
1985afb4:  [<0806412c>] run_kernel_thread+0x37/0x3f
1985afe0:  [<080569cb>] new_thread_handler+0x57/0x7e
1985affc:  [<00000000>] _sinittext+0xf7fb7000/0x88

segfaults



Is there anything i am missing? please help

---
husher