msdosfs umount problem

[Özkan KIRIK]

Hello,

I've just checkedout stable/12 branch. Unmounting msdosfs blocks

# newfs_msdos -C 40M efiboot.img
efiboot.img: 81800 sectors in 10225 FAT16 clusters (4096 bytes/cluster)
BytesPerSec=512 SecPerClust=8 ResSectors=1 FATs=2 RootDirEnts=512
Media=0xf0 FATsecs=40 SecPerTrack=63 Heads=255 HiddenSecs=0
HugeSectors=81920
# mdconfig ./efiboot.img
md0
# mount -t msdosfs /dev/md0 /mnt
# umount -vf /mnt    (uninterruptable wait)

On other termial:
# ps ax | grep umount
1333  0  D+     0:00.00 umount -vf /mnt

There is not such a problem on 12.1 stable

Thanks