From owner-freebsd-current@freebsd.org  Tue Jul  3 17:47:45 2018
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 742BB10372EC
 for <freebsd-current@mailman.ysv.freebsd.org>;
 Tue,  3 Jul 2018 17:47:45 +0000 (UTC)
 (envelope-from imb@protected-networks.net)
Received: from mail.protected-networks.net (mail.protected-networks.net
 [IPv6:2001:470:8d59:1::8])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "mail.protected-networks.net",
 Issuer "Protected Networks CA" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 1455D8E3BF
 for <freebsd-current@freebsd.org>; Tue,  3 Jul 2018 17:47:45 +0000 (UTC)
 (envelope-from imb@protected-networks.net)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=
 protected-networks.net; h=content-transfer-encoding
 :content-language:content-type:content-type:mime-version
 :user-agent:date:date:message-id:subject:subject:from:from; s=
 201508; t=1530640063; bh=h39K8+NhMI3vNhoLygtESUIKvrClsIfQ3bDbYdL
 5m5U=; b=S4XFciEAR4VnBBYX886V/JUNtSm2FvQ6PhF2PU+iKAMlKX/RskEvX4I
 KP3DRTQtigYb4dGvSLIkIwQVV7eiFaeDCzrKJtQpsv5o9UgI08HJPiJZYgKJCrCZ
 5wUYha7UhHfvoqfGqA9FOSj4EnPaYvumcUjx+x7Uqc0T8913HAA0=
Received: from toshi.auburn.protected-networks.net
 (toshi.auburn.protected-networks.net [192.168.1.10])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client did not present a certificate)
 (Authenticated sender: imb@mail.protected-networks.net)
 by mail.protected-networks.net (Postfix) with ESMTPSA id 0AE111A7EC
 for <freebsd-current@freebsd.org>; Tue,  3 Jul 2018 13:47:43 -0400 (EDT)
To: freebsd-current <freebsd-current@freebsd.org>
From: Michael Butler <imb@protected-networks.net>
Subject: em0 link fail
Openpgp: preference=signencrypt
Message-ID: <739ef71a-f29f-68ea-955a-fb53c57960a6@protected-networks.net>
Date: Tue, 3 Jul 2018 13:47:42 -0400
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101
 Thunderbird/52.9.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.27
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <https://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: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 03 Jul 2018 17:47:45 -0000

On June 1st, I was able to do my monthly laptop ZFS snap-shot/back-up
(using "zfs snapshot -r zroot@backup; zfs send -R >nfs-filesys"). Now I
can't without the em0 interface stalling :-(

On a guess, I tried reverting SVN r335303 but that didn't help.

em0: <Intel(R) PRO/1000 Network Connection> port 0xf080-0xf09f mem
0xf7e00000-0xf7e1ffff,0xf7e39000-0xf7e39fff irq 20 at device 25.0 on pci0
em0: attach_pre capping queues at 1
em0: using 1024 tx descriptors and 1024 rx descriptors
em0: msix_init qsets capped at 1
em0: PCIY_MSIX capability not found; or rid 0 == 0.
em0: Using an MSI interrupt
em0: allocated for 1 tx_queues
em0: allocated for 1 rx_queues
em0: Ethernet address: f0:1f:af:66:95:7e
em0: netmap queues/slots: TX 1/1024, RX 1/1024
em0: link state changed to UP

 [ initiate "zfs send" ]

em0: TX(0) desc avail = 41, pidx = 172
em0: link state changed to DOWN
em0: TX(0) desc avail = 1024, pidx = 0
em0: TX(0) desc avail = 1024, pidx = 0

 .. ad nauseum ..

"ifconfig em0 down; ifconfig em0 up" doesn't help.

Any hints?

	imb