msdosfs umount problem

[Özkan KIRIK]

# ps alxww | grep umount
   0 13556  1360  0  20  0 10716  2076 mntref   D+    1    0:00.00 umount
-vf /mnt

checkedout version:
commit e7cae3d24a3e8d036c763f294bcd9883a180c36a (freebsd/stable/12)
https://github.com/freebsd/freebsd/commits/stable/12 (still it's the last
commit)

On Fri, Dec 4, 2020 at 4:26 PM Konstantin Belousov <kib at freebsd.org> wrote:

> On Fri, Dec 04, 2020 at 03:19:31PM +0300, Özkan KIRIK wrote:
> > 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
> Which revision did you checked out ?
> Show the mchan of the umount process, like 'px alxww | grep umount'.
>