minus disk usage

[Uematsu Takeshi]

Hi,This is Takeshi Uematsu.

I have a trouble on the ext3 filesystem.
The df command indicates minus disk usage.
Dose anyone know why this happned ?
Any ideas be appreciated.

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              97G  -26G  118G   -  /
/dev/sda1              99M   15M   80M  16% /boot
tmpfs                 2.0G     0  2.0G   0% /dev/shm
/dev/sda3             803G  3.9G  758G   1% /home

fdisk /dev/sda

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14       13067   104856255   83  Linux
/dev/sda3           13068      121193   868522095   83  Linux
/dev/sda4          121194      121454     2096482+  82  Linux swap / Solaris