NetBSD Problem Report #9520

Received: (qmail 13242 invoked from network); 1 Mar 2000 22:18:12 -0000
Message-Id: <>
Date: Wed, 1 Mar 2000 23:18:09 +0100 (CET)
From: Lennart Augustsson <>
Subject: umount -f hanging
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>Number:         9520
>Category:       kern
>Synopsis:       umount -f hanging
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 01 14:21:00 +0000 2000
>Last-Modified:  Thu Mar 22 20:47:46 +0000 2001
>Originator:     Lennart Augustsson
>Release:        20000229
Department of Computing Science, Chalmers University
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 `/'.

From: Lennart Augustsson <>
Subject: Re: kern/9520: umount -f hanging
Date: Wed, 1 Mar 2000 23:22:06 +0100 (CET)

 Amendment:  It is in fact just the mount point that is inaccessible after
 umount hangs, not the directory where it resides.  Mea culpa.

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