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Re: kern/45305: umount says device busy without any process having current directory in the mount or file open
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: Mon, 29 Aug 2011 13:35:46 +0200
Hello,
On Mon, Aug 29, 2011 at 10:25:02AM +0000, matthew green wrote:
> what does "fstat" say in this case? it should report any thing that
> is showing an open filesystem. also, for the killed everything case,
> what processes are running?
fstat: the only listed stuff is related to / and no other mount point
Running processes: init, one login, one /bin/sh (fresh root login).
If I only have those processes running, I would assume that I'm able
to unmount everything except /?
> also, what about "mount -a"? fstat doesn't report nullfs mounts that
> keep a filesystem busy.
As I required to use the corresponding computer, I need to make it
behave like this again. I'll try mount -a and then report, but don't
understand currently why that should give some insight. The problem
mounts are listed as noauto mounts in fstab and thus I assume mount -a
should do anything about them.
The last time, the nfs-mount got stuck. The two null-mounts were
unmounted successfully.
--
Matthias Kretschmer
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