From owner-freebsd-stable@freebsd.org  Fri Dec  9 13:13:38 2016
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 DD7D1C6BB12
 for <freebsd-stable@mailman.ysv.freebsd.org>;
 Fri,  9 Dec 2016 13:13:38 +0000 (UTC)
 (envelope-from emz@norma.perm.ru)
Received: from elf.hq.norma.perm.ru (mail.norma.perm.ru [IPv6:2a00:7540:1::5])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256
 bits)) (Client CN "mail.norma.perm.ru",
 Issuer "Vivat-Trade UNIX Root CA" (not verified))
 by mx1.freebsd.org (Postfix) with ESMTPS id 564211627
 for <freebsd-stable@freebsd.org>; Fri,  9 Dec 2016 13:13:38 +0000 (UTC)
 (envelope-from emz@norma.perm.ru)
Received: from bsdrookie.norma.com. (pc846408.norma.com [IPv6:fd00::73d] (may
 be forged))
 by elf.hq.norma.perm.ru (8.15.2/8.15.2) with ESMTPS id uB9DDWLY070909
 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO)
 for <freebsd-stable@freebsd.org>; Fri, 9 Dec 2016 18:13:32 +0500 (YEKT)
 (envelope-from emz@norma.perm.ru)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=norma.perm.ru; s=key;
 t=1481289213; bh=rUEskBDfacj5AvT6kikuok0BB8Tr/OlHwPtFFyFEjvA=;
 h=To:From:Subject:Date;
 b=uODZRUvNJU72g+OYjHeERuNzRoGym/Ut0r6/76q8WoSI0pUh6LDbLSdbP9BT0926s
 G2tUrFb10Bv26W4/LOBwF6xxxrA8zYTAPc68xjXeHnfkt/i21LKZiV4gDsCzE/wnFU
 5Og0PJEUkUR/x2gmS1ejPHUke5KCFrEaxakwlqrU=
To: freebsd-stable@freebsd.org
From: "Eugene M. Zheganin" <emz@norma.perm.ru>
Subject: vfs.zfs.vdev.bio_delete_disable - crash while changing on the fly
Message-ID: <584AADFC.8090700@norma.perm.ru>
Date: Fri, 9 Dec 2016 18:13:32 +0500
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101
 Thunderbird/38.7.0
MIME-Version: 1.0
Content-Type: text/plain; charset=koi8-r
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: Fri, 09 Dec 2016 13:13:39 -0000

Hi.

Recently I've encountered the issue with "slow TRIM" and Sandisk SSDs,
so I was told  to try to disable TRIM and see what happens (thanks a lot
by the way, that did it). But changing the
vfs.zfs.vdev.bio_delete_disable on the fly can lead to the system crash
with the probability of 50%. Is it just me or is this already known ? If
it's known, why isn't this oid in a read-only list ?

Thanks.

P.S. My box tried to dump a core, but after a reboot savecore got
nothing, so you just have to believe me. ;)

Eugene.