From owner-freebsd-current@FreeBSD.ORG  Sun Mar 29 19:29:53 2015
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 69C18A29
 for <freebsd-current@freebsd.org>; Sun, 29 Mar 2015 19:29:53 +0000 (UTC)
Received: from munin.odin-corporation.com
 (173-161-46-1-Illinois.hfc.comcastbusiness.net [173.161.46.1])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "Lars Fredriksen", Issuer "Lars Fredriksen" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 1E4AEC8A
 for <freebsd-current@freebsd.org>; Sun, 29 Mar 2015 19:29:51 +0000 (UTC)
Received: from larsmacmini.fredriksen.us (valhall.odin-corporation.com
 [173.161.46.2]) (authenticated bits=0)
 by munin.odin-corporation.com (8.14.5/8.14.5) with ESMTP id t2TJTh3S075317
 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO)
 for <freebsd-current@freebsd.org>; Sun, 29 Mar 2015 14:29:44 -0500 (CDT)
 (envelope-from lars@odin-corporation.com)
From: Lars <lars@odin-corporation.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Subject: Is a high witness refcount indicative of a missing unlock?
Message-Id: <1117D087-AD76-4A87-8798-AB5526BECF3A@odin-corporation.com>
Date: Sun, 29 Mar 2015 14:29:42 -0500
To: freebsd-current@freebsd.org
Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2093\))
X-Mailer: Apple Mail (2.2093)
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 29 Mar 2015 19:29:53 -0000

Hi,
I am poking around for a cause for my repeating deadlock issues on my =
system based on r 279869. ddb show witness show the =E2=80=9Cvnode =
interlock=E2=80=9D and the =E2=80=9Czfs=E2=80=9D locks both with =
reference counts over 200K. Obviously they are related, and there is a =
find running (all the filesystems on this machine are zfs ( minus the =
specialty ones like devfs).

I don=E2=80=99t see any other withness entry with reference counts even =
in the ballpark of these two, so does this indicate that we have a =
vnode/zfs path were we don=E2=80=99t unlock?

Thanks,
Lars=