What ext version are you using?

Its ext4 ,
# file Fedora14-AMD64-root_fs
Fedora14-AMD64-root_fs: Linux rev 1.0 ext4 filesystem data (extents) (large files) (huge files)

Was the filesystem clean?

I'm not sure as I didn't create them ,manually.But Its not working after initial shutdown.

Are you using ext4 to read ext2/3?
Yes,its ext4 root_fs after logged into uml, I tried to create ext2fs (dd if=/dev/zero of=ext2.img bs=1M count=50)
and formatted it and then set some break points via gdb -p and mounted it as loop back.
Should I use ext2 as root_fs instead of ext4?Will that help?

I would not trust any image from http://fs.devloop.org.uk/. :)

okay. :D Any suggestions on  where I should download root FS image?

I want to debug/explore ext2fs using UML.

Thanks.



--
Thanks,
//richard




--
----
Cheers,
Lakshmipathi.G
FOSS Programmer.
www.giis.co.in