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>]

The following reply was made to PR kern/45305; it has been noted by GNATS.

From: Matthias Kretschmer <kretschm%cs.uni-bonn.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/45305: umount says device busy without any process having 
current directory in the mount or file open
Date: Tue, 27 Sep 2011 07:35:42 +0200

 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