Date: Tue, 12 Jul 2016 09:12:02 +0200 From: Damelin <info@dcc.edu.za> To: freebsd-stable@freebsd.org Subject: Join the School of Business Professionals Message-ID: <201607129091236.29478.1163@dcc.edu.za>
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School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) School of Business Professionals ( https://www.dcc.edu.za/mailer-campaign/business-professionals ) From owner-freebsd-stable@freebsd.org Tue Jul 12 14:23:06 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 A694BB92B25 for <freebsd-stable@mailman.ysv.freebsd.org>; Tue, 12 Jul 2016 14:23:06 +0000 (UTC) (envelope-from freebsd-stable-local@be-well.ilk.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 9174E1159 for <freebsd-stable@freebsd.org>; Tue, 12 Jul 2016 14:23:06 +0000 (UTC) (envelope-from freebsd-stable-local@be-well.ilk.org) Received: by mailman.ysv.freebsd.org (Postfix) id 90CF7B92B24; Tue, 12 Jul 2016 14:23:06 +0000 (UTC) Delivered-To: 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 907DEB92B22 for <stable@mailman.ysv.freebsd.org>; Tue, 12 Jul 2016 14:23:06 +0000 (UTC) (envelope-from freebsd-stable-local@be-well.ilk.org) Received: from be-well.ilk.org (be-well.ilk.org [23.30.133.173]) by mx1.freebsd.org (Postfix) with ESMTP id 6A0501156 for <stable@freebsd.org>; Tue, 12 Jul 2016 14:23:06 +0000 (UTC) (envelope-from freebsd-stable-local@be-well.ilk.org) Received: from lowell-desk.lan (router.lan [172.30.250.2]) by be-well.ilk.org (Postfix) with ESMTP id 3284D33C1E for <stable@freebsd.org>; Tue, 12 Jul 2016 10:22:53 -0400 (EDT) Received: by lowell-desk.lan (Postfix, from userid 1147) id E771139819; Tue, 12 Jul 2016 10:22:52 -0400 (EDT) From: Lowell Gilbert <freebsd-stable-local@be-well.ilk.org> To: stable@freebsd.org Subject: Re: Not-so stable if you take a CAM error.... References: <2b0c454b-c1a0-4b5b-e778-bf0939e90ae1@denninger.net> <op.ykfe1fvbkndu52@ronaldradial.radialsg.local> <6e9c07e1-12a6-a7cd-f775-6b0fe5a706bc@denninger.net> <1468243977.72182.118.camel@freebsd.org> <877f5e8e-c1e7-6fb0-6ceb-031ce3e68582@denninger.net> <CAKFCL4WrRS1ic1CZqcmbCEnsrD2pkh4VHPBFyB+-3NaNJZ+Jkw@mail.gmail.com> <1468254746.72182.121.camel@freebsd.org> <f22ab40d-42f0-78a3-d3a7-945387259109@denninger.net> Date: Tue, 12 Jul 2016 10:22:52 -0400 In-Reply-To: <f22ab40d-42f0-78a3-d3a7-945387259109@denninger.net> (Karl Denninger's message of "Mon, 11 Jul 2016 12:30:34 -0500") Message-ID: <447fcrdjgj.fsf@lowell-desk.lan> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.22 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: Tue, 12 Jul 2016 14:23:06 -0000 Karl Denninger <karl@denninger.net> writes: > Why not force-detach the volume that takes the error instead of a panic()? > > That would lead to a panic if the detached volume was the system volume > (obviously) but for a data volume it would simply result in it being > forcibly unmounted (and dirty, so if it's corrupt it will get caught > when reattached.) > > It seems that the current paradigm of saying "screw you, panic the > machine" violates the principle of least astonishment and is overly > punitive vis-a-vis necessity. Refusing further I/O because the volume > may now have a corrupt filesystem appears to be facially reasonable, but > that doesn't necessarily wind up being fatal the system itself -- it is > if that's the system volume and is not covered by some sort of > redundancy, obviously, but it's not in all cases. How do you find the processes with pages mapped from the filesystem's vnodes? UFS is *very* tightly tied to the VM system, and intentionally so. Recall that "umount -f" isn't exactly safe...
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