strange df output

[Divacky Roman]

Hi,

with recent 6-current I had to reboot my machine (I tried mount my cdrom but
the process hanged in kernel then everything started to crash).

after panic, fsck was invoken:
witten ~# fsck /
** /dev/ad0s1a (NO WRITE)
** Last Mounted on /
** Root file system
** Phase 1 - Check Blocks and Sizes
fsck_ufs: cannot alloc 3221471004 bytes for inoinfo

and df shows this:
witten ~# df
Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/ad0s1a    143G    4.5T   -4.4T  3520%    /


is this a known problem? what can I do with it?

thnx for advices/fixes

roman