UFS journal error on 10.0-CURRENT

Hi,

after a power dip (don't ask how!) my 10.0-amd64 laptop running
r239793 decided to check its file systems.
On /usr it fixed some errors but I am stuck with:

# fsck -y /usr
** /dev/ada0s1f
USE JOURNAL? yes
** SU+J Recovering /dev/ada0s1f
** Reading 33554432 byte journal from inode 5
RECOVER? yes
** Building recovery table.
** Resolving unreferenced inode list.
** Processing journal entries
fsck_ufs: Directory 43643675 name not found
#

So fsck never fully completes, leaving /usr unmountable.
I could try to do a file system check without the journal.

René