From owner-freebsd-current@freebsd.org Mon Jul 17 06:36:53 2017 Return-Path: Delivered-To: freebsd-current@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 55824CFDC62 for ; Mon, 17 Jul 2017 06:36:53 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from mailman.ysv.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 417B874E91 for ; Mon, 17 Jul 2017 06:36:53 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: by mailman.ysv.freebsd.org (Postfix) id 40E0BCFDC61; Mon, 17 Jul 2017 06:36:53 +0000 (UTC) Delivered-To: current@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 407ADCFDC60 for ; Mon, 17 Jul 2017 06:36:53 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citapm.icyb.net.ua (citapm.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 8D24B74E8B for ; Mon, 17 Jul 2017 06:36:52 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citapm.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id JAA05404; Mon, 17 Jul 2017 09:36:50 +0300 (EEST) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1dWzeE-0006OA-D7; Mon, 17 Jul 2017 09:36:50 +0300 Subject: Re: Caveat emptor: Beware of ZFS on HEAD To: Peter Wemm , Current References: <2830123.MIUbdsJfkU@overcee.wemm.org> From: Andriy Gapon Message-ID: <2cd885e1-737b-b8fc-e446-7249ca92f04d@FreeBSD.org> Date: Mon, 17 Jul 2017 09:35:54 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <2830123.MIUbdsJfkU@overcee.wemm.org> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jul 2017 06:36:53 -0000 On 12/07/2017 23:20, Peter Wemm wrote: > We mostly run HEAD in the freebsd.org cluster. Sometime in the last few weeks > an ugly zfs problem has surfaced. If a redundant volume is degraded, zfs > panics on boot. If a drive fails while running, or is manually put offline, zfs > panics the same way. > > I do not have a smoking gun, but I am suspicious of the June 28th commits > (starting at r320156) and their follow-ups. eg: r320452. > > https://bugs.freebsd.org/220691 > > I believe single disk systems will *not* be affected by this - the panic only > happens when a raidz (and presumably mirror) degrades. Your laptop etc should > be fine. > > I apologize for being vague - I do not know more. Folks running HEAD should > take appropritate precautions (eg: keeping a known-good kernel.old and modules > around). This is always advisable when running HEAD anyway, particularly so > now. For us, a kernel.old from June 18th worked fine. > My apologies for the bug. Everyone affected, could you please test the patch from the bug report? https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220691#c3 Thank you! -- Andriy Gapon