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Old 05-28-2013, 09:21 AM   #1
vandana agarwal
LQ Newbie
Registered: Apr 2012
Posts: 10

Rep: Reputation: Disabled
learning UML - unable to start


I was trying to run UML.
I have downloaded and unzipped 'linux-2.6.24-rc7' and also 'Fedora18-x86-root_fs'.
Now I executed commands as follows :
chmod chmod 755 linux-2.6.24-rc7
./linux-2.6.24-rc7 ubda=./Fedora18-x86-root_fs  mem=128M
The output is as follows :
console [tty0] enabled
Initializing software serial port version 1
console [mc-1] enabled
 ubda: unknown partition table
EXT3-fs: ubda: couldn't mount because of unsupported optional features (240).
EXT2-fs: ubda: couldn't mount because of unsupported optional features (240).
List of all partitions:
6200    2097152 ubda driver: uml-blkdev
No filesystem could mount root, tried:  reiserfs ext3 ext2
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)

EIP: 0073:[<b76ff424>] CPU: 0 Not tainted ESP: 007b:bfcef9c8 EFLAGS: 00000292
    Not tainted
EAX: 00000000 EBX: 000013dc ECX: 00000013 EDX: 000013dc
ESI: 000013d8 EDI: 00000003 EBP: bfcef9ec DS: 007b ES: 007b
1145ae78:  [<08069f14>] show_regs+0xb4/0xb9
1145aea4:  [<08058c6e>] panic_exit+0x25/0x3f
1145aeb8:  [<080853e4>] notifier_call_chain+0x21/0x46
1145aed8:  [<0808547f>] __atomic_notifier_call_chain+0x17/0x19
1145aef4:  [<08085496>] atomic_notifier_call_chain+0x15/0x17
1145af10:  [<08070772>] panic+0x52/0xdd
1145af30:  [<08049a88>] mount_block_root+0xf8/0x10e
1145af78:  [<08049aea>] mount_root+0x4c/0x54
1145af9c:  [<08049bfe>] prepare_namespace+0x10c/0x133
1145afa4:  [<080497b3>] kernel_init+0x79/0x85
1145afb4:  [<0806412c>] run_kernel_thread+0x37/0x3f
1145afe0:  [<080569cb>] new_thread_handler+0x57/0x7e
1145affc:  [<00000000>] _sinittext+0xf7fb7000/0x88

Segmentation fault (core dumped)
Can someone please explain me what kind of problem am I facing.
My host system is Ubuntu.
Old 06-09-2013, 06:41 PM   #2
Registered: Dec 2005
Distribution: Fedora, CentOS
Posts: 514

Rep: Reputation: 66
Is there any reason why you need to run a UML kernel? Why not use Xen or KMS? I certainly wouldn't use Fedora's layout on an outdated, unsupported, release candidate kernel. I strongly suggest becoming more familiar with your distribution before blindly running commands like that.
Old 06-10-2013, 06:41 AM   #3
vandana agarwal
LQ Newbie
Registered: Apr 2012
Posts: 10

Original Poster
Rep: Reputation: Disabled
Thank you


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