[RC1] ext2fs broken?

Hi,

I have observed some strange behaviour of mounted ext2fs (*ick*) 
filesystems. The strange behaviour ranges from when unpacking a tar in a 
mounted ext2fs filesystem getting "cannot open: Operation not permitted" 
or "...File exists" and ls(1) saying the whole device its empty. 
Sometimes directories disappear, the block count is massively different 
from what Linux says about it.

Example of what can happen when trying to umount the device:

fsync: giving up on dirty: 0xc6339618: tag ext2fs, type VDIR, usecount 
1, writec
ount 0, refcount 3, lock type ext2fs: EXCL (count 1) by thread 0xc46783c0
        ino 57, on dev da0s2 (4, 40)

I have no experience in filesystem debugging, if there is more info 
needed, please tell me how to collect it.

Regards,
k.j.