Issues with preupgrade F15B?

[Philip A. Prindeville]

I'm seeing the following after trying to update an fc14.x86_64 platform (updated) to Lovelock (F15B) with preupgrade:

  Booting 'Upgrade to Fedora 15 (Lovelock)'

kernel /upgrade/vmlinuz preupgrade repo=hd::/var/cache/yum/preupgrade ks=hd:UUID=da026107-5d0c-4c77-9fa4-502576c05cdd:/upgrade/ks.cfg
   [Linux-bzImage, setup=0x4000, size=0x3ac3d0]
initrd /upgrade/initrd.img


then it hangs.

No idea how to go about debugging this.  Any suggestions appreciated.  I'd file a bug against it, but it's not clear to me exactly where the failure is occuring.

My grub.conf file looks like:

#boot=/dev/sda
default=1
timeout=50
splashimage=(hd0,0)/grub/splash.xpm.gz
# hiddenmenu
# philipp
serial --unit=0 --speed=115200
terminal --lines=45 serial
verbose
# philipp
title Upgrade to Fedora 15 (Lovelock)
	kernel /upgrade/vmlinuz preupgrade repo=hd::/var/cache/yum/preupgrade ks=hd:UUID=da026107-5d0c-4c77-9fa4-502576c05cdd:/upgrade/ks.cfg
	initrd /upgrade/initrd.img
title Fedora (2.6.35.12-88.fc14.x86_64)
	root (hd0,0)
	kernel /vmlinuz-2.6.35.12-88.fc14.x86_64 ro root=UUID=be3e7b56-1fef-40e5-866e-bd09b45b7e67 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us nf_conntrack.acct=1 console=ttyS0,115200n8
	initrd /initramfs-2.6.35.12-88.fc14.x86_64.img


And yes, I've tried booting it headless and not...

-Philip