From owner-freebsd-questions@freebsd.org  Thu Dec 22 01:27:45 2016
Return-Path: <owner-freebsd-questions@freebsd.org>
Delivered-To: freebsd-questions@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 1B96CC8BB2E
 for <freebsd-questions@mailman.ysv.freebsd.org>;
 Thu, 22 Dec 2016 01:27:45 +0000 (UTC) (envelope-from mike@tela.com)
Received: from spider3.tela.com (smtp3.tela.com [208.90.22.69])
 (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 F3A67E08
 for <freebsd-questions@freebsd.org>; Thu, 22 Dec 2016 01:27:44 +0000 (UTC)
 (envelope-from mike@tela.com)
Received: by spider3.tela.com (Postfix, from userid 103)
 id 8BAFA34AB23; Wed, 21 Dec 2016 19:23:10 -0600 (CST)
DKIM-Filter: OpenDKIM Filter v2.10.3 spider3.tela.com 8BAFA34AB23
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=tela.com;
 s=comtela1601; t=1482369790;
 bh=6ke6+QRLfJe6VVvXLRRiefsHLv1y2y3U4ba4CGNffVs=;
 h=Date:From:To:Subject;
 z=Date:=20Wed,=2021=20Dec=202016=2019:23:10=20-0600|From:=20Mike=20
 Selner=20<mike@tela.com>|To:=20freebsd-questions@freebsd.org|Subje
 ct:=20ZFS=20crash=20on=20mountroot=20after=20removal=20of=20slog=2
 0device;
 b=k/SM5C3JGJc80bOkY5LmekDKls2KK74wQ9UPLKhL2Qyi3uBwtATXRVnUUvYWzByv6
 HocP83iI+3Krv2H7G5ojAf9J5iVQv+ftjy/Ojq6ee2xNLxpXYiPDxPsJp8D2r9r9d4
 4REAalG5iHIEH1yGZ2n8eY/kPh5Q1oKlb8Uz7ALc=
Date: Wed, 21 Dec 2016 19:23:10 -0600
From: Mike Selner <mike@tela.com>
To: freebsd-questions@freebsd.org
Subject: ZFS crash on mountroot after removal of slog device
Message-ID: <20161222012310.GA59045@spider3.tela.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 22 Dec 2016 01:27:45 -0000

Hello,
I have a FreeBSD 10.3 system with all filesystems on ZFS (except some tmp on SSD).

I have L2ARC and SLOG on SSD. The SSD started reporting SMART errors so I removed the L2ARC device which worked fine.  Then I removed the SLOG device using:

zpool remove zroot gpt/ssdslog0

The system returned to the # prompt but a few minutes later the system panicked and and rebooted. After reboot it fails to mount root fs, giving the message:

Trying to mount root from zfs:zroot/ROOT/default [ ]...
panic: solaris assert: nvlist_lookup_uint64(configs[ i], ZPOOL_CONFIG_POOL_TXG, &txg) == 0, file: /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/spa.c, line: 4039
cpuid = 4

Short version: I can import the pool using fixit on an install memstick, but can not get the system to mountroot when booting from this pool.

Full details at https://forums.freebsd.org/threads/59006/.

Please advise if I should also post full details here.

Thank you
-- 
Mike