Date: Mon, 16 Feb 2009 10:44:02 -0900 From: Mel <fbsd.questions@rachie.is-a-geek.net> To: freebsd-questions@freebsd.org, Polytropon <freebsd@edvax.de> Cc: Tim Judd <tajudd@gmail.com> Subject: Re: Determining process preventing umount of busy partition Message-ID: <200902161044.02542.fbsd.questions@rachie.is-a-geek.net> In-Reply-To: <20090212083411.bbde5802.freebsd@edvax.de> References: <20090212062505.ca66b93e.freebsd@edvax.de> <4993CB0A.7090809@gmail.com> <20090212083411.bbde5802.freebsd@edvax.de>
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On Wednesday 11 February 2009 22:34:11 Polytropon wrote:
> First of all, I checked both lsof's and fstat's output: NOTHING seems to
> have a file open in the /usr partition. Very strange. Of course, I've tried
> the copies of both tools in /root/bin so they don't cause any access on
> /usr theirselves.
>
> On Thu, 12 Feb 2009 00:08:58 -0700, Tim Judd <tajudd@gmail.com> wrote:
> > Most commonly for me is because my $PWD (or CWD) is in the filesystem i
> > intend to umount
>
> I've checked this: In SUM, $CWD was /, and root's $HOME is /root on
> the / partition. Users' home directories are on /home which is separated
> from /usr (and can be unmounted without problems). At no time, a $CWD
> was on /usr partition.
>
> > so as a habit now, i move myself to the root partition (when logged in
> > as root) via the following, and assuming I want to umount /usr
> >
> >
> > # umount /usr
> > umount: unmount of /usr failed: Device busy
> > # cd
> > # umount /usr
> >
> >
> > cd, with no arguments, move you to ~ (aka $HOME)
>
> Which would be /root in case of SUM.
>
>
>
> As I said, very strange...
Is this a one-time event or 100% reproducable?
A likely scenario is:
- You have squid running
- You have rc_shutdowntimeout at default (30 seconds)
- rc hits the watchdog while squid is being shutdown
- you unmount
- get busy
- call fstat at which point squid has been shutdown.
Replace squid with anything that takes 30+ seconds to shutdown. Allthough,
they would probably already fail at umount /var. Squid with defaults is fully
contained in /usr/local.
--
Mel
Problem with today's modular software: they start with the modules
and never get to the software part.
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