Subject: kern/9520: umount -f hanging
To: None <>
From: Lennart Augustsson <>
List: netbsd-bugs
Date: 03/01/2000 14:21:37
>Number:         9520
>Category:       kern
>Synopsis:       umount -f hanging
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar  1 14:21:00 2000
>Originator:     Lennart Augustsson
Department of Computing Science, Chalmers University
>Release:        NetBSD-current 2000-02-29
System: NetBSD opus 1.4T NetBSD 1.4T (OPUS) #42: Sun Feb 27 21:55:42 CET 2000 augustss@opus:/extra/NetBSD/src/sys/arch/i386/compile/OPUS i386

	It's pretty easy to hang `umount -f' and get inaccessible
	NFS mount a file system over an interface that is detachable.
	Detach the interface.
	Try `umount -f' on the file system.  It hangs.
	But what is much worse is that the directory which had the
	mount point is no longer accessible.  E.g., I did `umount -f /mp3'
	and now I can no longer access `/'.