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Date:      Fri, 13 Jul 2012 17:06:32 +0200
From:      Fabian Keil <freebsd-listen@fabiankeil.de>
To:        Lytochkin Boris <lytboris@gmail.com>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: ZFS hanging
Message-ID:  <20120713170632.065e650e@fabiankeil.de>
In-Reply-To: <CAEJYa-RFuJKTOd3_Ykj3Z8KYPuYoQUwiwOr5i37C0FeZ2MUsvw@mail.gmail.com>
References:  <1341864787.32803.43.camel@btw.pki2.com> <20120712151541.7f3a6886@fabiankeil.de> <CAEJYa-RFuJKTOd3_Ykj3Z8KYPuYoQUwiwOr5i37C0FeZ2MUsvw@mail.gmail.com>

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Lytochkin Boris <lytboris@gmail.com> wrote:

> On Thu, Jul 12, 2012 at 5:15 PM, Fabian Keil
> <freebsd-listen@fabiankeil.de> wrote:
> > fk@r500 ~ $zpool status
> > load: 0.15  cmd: zpool 2698 [spa_namespace_lock] 543.23r 0.00u 0.12s 0%=
 2908k
>=20
> This sounds familiar with http://www.freebsd.org/cgi/query-pr.cgi?pr=3D16=
3770
> Try playing with kern.maxvnodes.

Thanks for the suggestion, but the system is my laptop and I already
set kern.maxvnodes=3D400000 which I suspect is more than I'll ever need.

Currently I uses less than a tenth of this, but I'll keep an eye on
it the next time the issue occurs.

I usually reach this deadlock after losing the vdev in a single-vdev pool.
My suspicion is that the deadlock is caused by some kind of "failure to
communicate" between ZFS and the various geom layers involved.

I already know that losing vdevs with the pool configuration I use
can cause http://www.freebsd.org/cgi/query-pr.cgi?pr=3Dkern/162010
and http://www.freebsd.org/cgi/query-pr.cgi?pr=3Dkern/162036 and I
suspect that the deadlock is just another symptom of the same issue.

Fabian

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