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

[christos%zoulas.com@localhost (Christos Zoulas)]

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

From: christos%zoulas.com@localhost (Christos Zoulas)
To: gnats-bugs%NetBSD.org@localhost, kern-bug-people%netbsd.org@localhost, 
        gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, 
kretschm%cs.uni-bonn.de@localhost
Cc: 
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 09:47:15 -0400

 On Sep 27,  5:40am, kretschm%cs.uni-bonn.de@localhost (Matthias Kretschmer) 
wrote:
 -- Subject: Re: kern/45305: umount says device busy without any process havin
 
 | 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
 |  # 
 
 Do you have a recipe for recreating the problem?
 
 christos