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Date:      Thu, 26 Nov 2020 17:34:22 +0000
From:      Gary Palmer <gpalmer@freebsd.org>
To:        Graham Perrin <grahamperrin@gmail.com>
Cc:        freebsd-current@freebsd.org
Subject:   Re: zpool export: umount fails, device inexplicably busy (lsof finds nothing)
Message-ID:  <20201126173422.GB46155@in-addr.com>
In-Reply-To: <1b4bf881-7689-95ac-6bb5-984d063bda73@gmail.com>
References:  <a4e3b895-78d2-4b0a-1cb1-477f35bc437c@gmail.com> <4125dad7-b1ea-bf20-4996-6a138ff202eb@gmail.com> <b7d3cc4b-7e32-c365-57ad-eee86b449dce@gmail.com> <1b4bf881-7689-95ac-6bb5-984d063bda73@gmail.com>

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On Thu, Nov 26, 2020 at 04:55:46PM +0000, Graham Perrin wrote:
> On 25/11/2020 17:35, Graham Perrin wrote:
> > ???
> > > root@momh167-gjp4-8570p:~ # zpool export Transcend
> > > cannot unmount '/Volumes/t500': umount failed
> > > root@momh167-gjp4-8570p:~ # umount /Volumes/t500
> > > umount: unmount of /Volumes/t500 failed: Device busy
> > > root@momh167-gjp4-8570p:~ # lsof /Volumes/t500/
> > > root@momh167-gjp4-8570p:~ #
> > > 
> > > ----
> > > 
> > > When this last occurred, I could export the pool after signing out
> > > from KDE.
> > > 
> > The problem seemed to be consistently reproducible but (fingers crossed)
> > no problem yesterday or today.
> > 
> > Previously: most often using OpenZFS in base.
> > 
> > Now using OpenZFS from ports, with r367936.
> > 
> > If the problem recurs: is it _ever_ sane to get nothing listed by lsof
> > for a volume that can not be unmounted?
> 
> I spoke too soon, the problem recurred this afternoon:
> 
> root@mowa219-gjp4-8570p:~ # zpool export Transcend
> cannot unmount '/Volumes/t500/VirtualBox': umount failed
> root@mowa219-gjp4-8570p:~ # lsof /Volumes/t500/VirtualBox
> lsof: WARNING: device cache mismatch: /dev/drm/121
> lsof: WARNING: /root/.lsof_mowa219-gjp4-8570p was updated.
> root@mowa219-gjp4-8570p:~ # lsof /Volumes/t500/VirtualBox
> root@mowa219-gjp4-8570p:~ # zpool export Transcend
> cannot unmount '/Volumes/t500/VirtualBox': umount failed
> root@mowa219-gjp4-8570p:~ # uname -v
> FreeBSD 13.0-CURRENT #72 r367936: Sun Nov 22 21:46:00 GMT 2020
> root@mowa219-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG
> root@mowa219-gjp4-8570p:~ # zfs --version
> zfs-0.8.0-1
> zfs-kmod-v2020110200-zfs_8583540c6
> root@mowa219-gjp4-8570p:~ #

does "fuser -c" show anything?

the -m option may also be interesting (Search through mmapped files too)

Regards,

Gary



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