Re: kern/45305: umount says device busy without any process having current directory in the mount or file open

[Matthias Kretschmer <kretschm%cs.uni-bonn.de@localhost>]

Hi,

I just want to add, that now I have data to the problem when even
the nullfs is not unmountable (or even both nullfs and nfs) ...

# lsof | grep netboot
# lsof /netboot/wrkobjdir
# umount /netboot/wrkobjdir
umount: /netboot/wrkobjdir: Device busy
# mount
/dev/wd0a on / type ffs (local)
/dev/wd0g on /var type ffs (local)
/dev/wd0e on /usr type ffs (local)
/dev/cgd0c on /home type ffs (local)
tmpfs on /tmp type tmpfs (local)
kernfs on /kern type kernfs (local)
ptyfs on /dev/pts type ptyfs (local)
procfs on /proc type procfs (local)
pid231@blavet:/net on /net type nfs (hidden)
pid231@blavet:/media on /media type nfs (hidden)
nfshost:/home/macppc/root on /netboot type nfs
/home/wrkobjdir on /netboot/wrkobjdir type null (local)
# umount -f /netboot/wrkobjdir
# umount /netboot
umount: /netboot: Device busy
# umount -f /netboot
# 

--
Matthias Kretschmer