From owner-freebsd-stable@freebsd.org  Wed Sep  6 11:02:50 2017
Return-Path: <owner-freebsd-stable@freebsd.org>
Delivered-To: freebsd-stable@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 481C7E21191
 for <freebsd-stable@mailman.ysv.freebsd.org>;
 Wed,  6 Sep 2017 11:02:50 +0000 (UTC)
 (envelope-from petefrench@ingresso.co.uk)
Received: from constantine.ingresso.co.uk (unknown [IPv6:2a02:b90:3002:411::3])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id D58AF80ED1
 for <freebsd-stable@freebsd.org>; Wed,  6 Sep 2017 11:02:49 +0000 (UTC)
 (envelope-from petefrench@ingresso.co.uk)
Received: from dilbert.london-internal.ingresso.co.uk ([10.64.50.6])
 by constantine.ingresso.co.uk with esmtpsa
 (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.89 (FreeBSD))
 (envelope-from <petefrench@ingresso.co.uk>) id 1dpY6W-000GDE-1T
 for freebsd-stable@freebsd.org; Wed, 06 Sep 2017 11:02:44 +0000
Subject: Re: 11.1 running on HyperV hn interface hangs
To: freebsd-stable@freebsd.org
References: <20170906193309.796c79ed@akips.com>
From: Pete French <petefrench@ingresso.co.uk>
Message-ID: <3f96c7d0-4fbd-26cb-5c84-8868d12eb427@ingresso.co.uk>
Date: Wed, 6 Sep 2017 12:02:43 +0100
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101
 Thunderbird/52.3.0
MIME-Version: 1.0
In-Reply-To: <20170906193309.796c79ed@akips.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-stable>, 
 <mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable/>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
 <mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Sep 2017 11:02:50 -0000

> We recently moved our software from 11.0-p9 to 11.1-p1, but looks like there
> is a regression in 11.1-p1 running on HyperV (Windows/HyperV 2012 R2) where
> the virtual hn0 interface hangs with the following kernel messages:
> 
>   hn0: <Hyper-V Network Interface> on vmbus0
>   hn0: Ethernet address: 00:15:5d:31:21:0f
>   hn0: link state changed to UP
>   ...
>   hn0: RXBUF ack retry
>   hn0: RXBUF ack failed
>   last message repeated 571 times
> 
> It requires a restart of the HyperV VM.
> 
> This is a customer production server (remote customer ~4000km away) running
> fairly critical monitoring software, so we needed to roll it back to 11.0-p9.
> We only have two customers running our software in HyperV, vs lots in VMware
> and a handful on physical hardware.
> 
> 11.0-p9 has been very stable.  Has anyone seen this problem before with 11.1 ?


I don't run anything on local hyper-v anymore, but I do run a ot of 
stuff in Azure, and we havent seen anything like this. I track STABLE 
for things though, updating after reading the commits and testing 
locally for a week or so, so the version I am running currently is 
r320175, which was part of 11.1-BETA2. I am going to upgrade to a more 
recent STABLE sometime this weke or next though, will do that on a test 
amchine and let you now how it goes.

I seem to recall that there were some large changes to the hn code in 
August to add virtual function support. When does 11.1-p1 date from ?

-pete.