I was going through UML linux kernel debugging here:
http://www.youtube.com/watch?v=li5EiItG-GU
Very Good effort.
some tips based on my expereince:
you need to enable following , if you are going to use Fedora20 based rootfs.(available here fs.devloop.org.uk )
CONFIG_BLK_DEV_INITRD=y
CONFIG_CGROUPS=y
CONFIG_EXT4_FS=y
CONFIG_EXT4_FS_XATTR=y
CONFIG_EXT4_FS_POSIX_ACL=y
CONFIG_EXT4_FS_SECURITY=y
CONFIG_EXT4_DEBUG=y
./linux ubda=$PWD/Fedora20-x86-root_fs mem=512m init=/bin/bas
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