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Date: Thu, 8 Sep 2011 21:54:06 +0200
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
To: luke@hybrid-logic.co.uk
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Cc: freebsd-fs@freebsd.org, tech@hybrid-logic.co.uk,
	Martin Matuska <mm@FreeBSD.org>
Subject: Re: ZFS hang in production on 8.2-RELEASE
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On Thu, Sep 08, 2011 at 06:19:48PM +0100, Luke Marsden wrote:
> On Mon, 2011-08-29 at 23:02 +0100, Luke Marsden wrote:
> > On Mon, 2011-08-29 at 22:54 +0200, Martin Matuska wrote:
> > > No, I think this is more likely fixed by pjd's bugfix in r224791 (MFC=
'ed
> > > to stable/8 as r225100).
> > >=20
> > > The corresponding patch is:
> > > http://people.freebsd.org/~pjd/patches/zfsdev_state_lock.patch
> > >=20
> >=20
> > Great, thanks!  Will this patch apply to ZFS v15?  We can't upgrade to
> > v28 yet.
> >=20
>=20
> We just got another hang in production, same procstat -kk on zfs umount
> -f as before:
>=20
> 52739 100186 zfs              -                mi_switch+0x176
> sleepq_wait+0x42 _sleep+0x317 zfsvfs_teardown+0x269 zfs_umount+0x1c4
> dounmount+0x32a unmount+0x38b syscallenter+0x1e5 syscall+0x4b
> Xfast_syscall+0xe2=20
>=20
> Please advise whether the zfsdev_state_lock patch with apply to
> 8.2-RELEASE and whether it is wise to attempt to apply it?

The zfsdev_state_lock patch won't help you, it fixes totally unrelated
problem. Could you send backtraces of all processes?

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://yomoli.com

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