From owner-freebsd-net@freebsd.org  Wed Jan 11 23:20:33 2017
Return-Path: <owner-freebsd-net@freebsd.org>
Delivered-To: freebsd-net@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 42F70CAB1C5
 for <freebsd-net@mailman.ysv.freebsd.org>;
 Wed, 11 Jan 2017 23:20:33 +0000 (UTC)
 (envelope-from michael+lists@burnttofu.net)
Received: from burnttofu.net (burnttofu.net [IPv6:2607:fc50:1:9d00::9977])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "burnttofu.net", Issuer "burnttofu.net" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 07C55190E
 for <freebsd-net@freebsd.org>; Wed, 11 Jan 2017 23:20:32 +0000 (UTC)
 (envelope-from michael+lists@burnttofu.net)
Received: from elwha.brokendns.net (elwha.brokendns.net
 [IPv6:2607:f2f8:a544::2])
 by burnttofu.net (8.15.2/8.15.2) with ESMTPS id v0BNKTes001255
 (version=TLSv1.2 cipher=DHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT);
 Wed, 11 Jan 2017 18:20:30 -0500 (EST)
 (envelope-from michael+lists@burnttofu.net)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=burnttofu.net; s=bt;
 t=1484176831; bh=30w/b42SRF+xlF4S0kI6lSY33ZhAHqFqG/cPnaDtIkg=;
 h=Subject:To:References:Cc:From:Date:In-Reply-To;
 b=aoJwa5YS8YWfmCmixJDrWsXBGJLItjhL2jQg+GTSbZZ1u6+ROGrYvTVC1GAu/Dfqb
 mvXp/UD72LaLxoERI9sSq2qTutnp6GhyxiimdQtpHlaSJYmprFsmVWUxSou7Y1xsHB
 Tuc04lygEFWJTIQatiKjXvCMyId+gBt9178i4BLCCw94QUlMr2rE/c3f+7igY/oAop
 VSMVtaeabHQzjN2H7lojiaf4avlLCwCUE8wwj708ZZezNAfsmKoNqikmE70JQDYJkI
 g6yCjVFdDSV1vuzlnrtsKnsiDofMXxLJPEGuPHk99DzZEDLzIgHX89xc0gjaABlQH9
 K8BZ3v9uAdiPw==
Received: from kimberton.burnttofu.net (unknown
 [IPv6:2601:643:8400:3e00::7777])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (No client certificate requested)
 by elwha.brokendns.net (5.65c/IDA-1.4.4/5.63) with ESMTPSA id 316AB7C8B;
 Wed, 11 Jan 2017 15:20:29 -0800 (PST)
Subject: Re: NFSv4 stuck
To: Slawa Olhovchenkov <slw@zxy.spb.ru>, Rick Macklem <rmacklem@uoguelph.ca>
References: <20170111220818.GD30374@zxy.spb.ru>
 <YTXPR01MB0189449C0DC06F53E93A3EF9DD660@YTXPR01MB0189.CANPRD01.PROD.OUTLOOK.COM>
 <20170111225922.GE30374@zxy.spb.ru>
Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>
From: Michael Sinatra <michael+lists@burnttofu.net>
Message-ID: <bfe09d16-8fdd-81b1-082b-bdf409d57be4@burnttofu.net>
Date: Wed, 11 Jan 2017 15:20:22 -0800
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:45.0) Gecko/20100101
 Thunderbird/45.6.0
MIME-Version: 1.0
In-Reply-To: <20170111225922.GE30374@zxy.spb.ru>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
X-Greylist: Default is to whitelist mail, not delayed by milter-greylist-4.6.1
 (burnttofu.net [IPv6:2607:fc50:1:9d00::9977]);
 Wed, 11 Jan 2017 18:20:31 -0500 (EST)
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net/>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-net>,
 <mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 11 Jan 2017 23:20:33 -0000

On 01/11/17 14:59, Slawa Olhovchenkov wrote:
> On Wed, Jan 11, 2017 at 10:39:42PM +0000, Rick Macklem wrote:
>
>> "umount -f" is your only chance. However, if there is already a non-forced
>> dismount stuck, it won't work because the non-forced dismount will have
>> the mounted-on vnode locked.
>
> I am use 'intr,soft' flags -- why ignored?

intr and soft are considered dangerous with nfsv4.  See the "BUGS" 
section of the mount_nfs(8) man page.

michael