Date: Wed, 19 Dec 2012 18:29:23 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: umount -f broken again [with devfs/NFS] Message-ID: <CAGH67wSHa9ydpkQnN8U7ZtdeD7av3-dU2vPzVn%2B1oLbaO=Tzhw@mail.gmail.com> In-Reply-To: <CAGH67wScgnNVsCemw9fZHGbb2YFTiYc=aMcsoNoXnoSTBdQM8A@mail.gmail.com> References: <CAGH67wScgnNVsCemw9fZHGbb2YFTiYc=aMcsoNoXnoSTBdQM8A@mail.gmail.com>
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On Wed, Dec 19, 2012 at 6:23 PM, Garrett Cooper <yanegomi@gmail.com> wrote:
> Ran into this with a build of CURRENT 2 week or so old version of
> CURRENT (gjb's livecd) and while unmounting devfs with a week old
> build:
>
> # umount -f /ifs
> umount: unmount of /ifs failed: Device busy
> # uname -a
> FreeBSD wf158.west.isilon.com 10.0-CURRENT FreeBSD 10.0-CURRENT #3
> r+5a05236: Wed Dec 12 17:35:14 PST 2012
> root@wf158.west.isilon.com:/usr/obj/usr/src/sys/ISI-GENERIC amd64
>
> My gut reaction is that some recently changes to VFS probably
> broke this (a couple week old 9-STABLE build just hangs on an NFS
> mountpoint that's gone out to lunch).
Interesting. Killed a "rogue mergemaster" instance and I noticed
that the umount -f command I had going on the 9-STABLE box is still
hung in newnfs state BUT the mountpoint is gone:
load: 0.11 cmd: umount 91115 [newnfs] 521.60r 0.00u 0.09s 0% 1440k
load: 0.11 cmd: umount 91115 [newnfs] 521.64r 0.00u 0.09s 0% 1440k
load: 0.11 cmd: umount 91115 [newnfs] 521.68r 0.00u 0.09s 0% 1440k
load: 0.11 cmd: umount 91115 [newnfs] 521.72r 0.00u 0.09s 0% 1440k
$ mount | grep /mnt/temp || echo "not found"
not found
$ ps auxww | grep umount | grep -v grep
root 91114 0.0 0.0 40152 2512 11 I+ 6:15PM 0:00.03
sudo umount -f /mnt/temp
root 91115 0.0 0.0 9872 1456 11 D+ 6:15PM 0:00.10
umount -f /mnt/temp
$ uname -a
FreeBSD forza.west.isilon.com 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #0
r+2fd0a57: Mon Dec 3 12:02:18 PST 2012
gcooper@forza.west.isilon.com:/usr/obj/usr/src/sys/FORZA amd64
I'm going to restart the box in a minute (have to swap out some
hardware), but I thought this was kind of strange.
Thanks,
-Garrett
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