From owner-freebsd-stable@freebsd.org Wed Aug 5 19:30:52 2015 Return-Path: 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 BC5D89B408F for ; Wed, 5 Aug 2015 19:30:52 +0000 (UTC) (envelope-from parv@bitter-almonds.com) Received: from nisba.pair.com (nisba.pair.com [209.68.5.171]) (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 9B713AA2; Wed, 5 Aug 2015 19:30:52 +0000 (UTC) (envelope-from parv@bitter-almonds.com) Received: from [192.168.11.4] (cpe-66-91-233-235.hawaii.res.rr.com [66.91.233.235]) by nisba.pair.com (Postfix) with ESMTPSA id 5D86C1141DA; Wed, 5 Aug 2015 15:30:49 -0400 (EDT) In-Reply-To: <1438783814.70393.138.camel@freebsd.org> References: <1438783814.70393.138.camel@freebsd.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Subject: Re: 8-stable crashing recently in ufsdirhash From: parv Date: Wed, 05 Aug 2015 09:30:28 -1000 To: Ian Lepore CC: freebsd-stable@freebsd.org Message-ID: <119E4C6D-ABFD-4D82-B353-D3829088233B@bitter-almonds.com> X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Aug 2015 19:30:52 -0000 On August 5, 2015 4:10:14 AM HST, Ian L wrote: >On Tue, 2015-08-04 at 23:54 -1000, parv wrote: >> Please CC me as I cannot properly use my laptop, Thinkpad X200 >(i386). >> >> 8-stable has been crashing a lot since source update of Jul 2015[0]. >After building debug kernel, kgdb shows lock reversal order & in >ufsdirhash. File systems (/, var, misc) are all UFS, with var & misc >having soft updates enabled. >> >> Crash had happened just after boot (during mktemp); when I tried to >delete a directory (/misc/obj); when I tried to edit (vi /etc/fstab) so >that / would be mounted readonly. Most recent crash ... >> >> http://imagebin.ca/v/2B50NARvIHsH >> >> Any clue would be appreciated. ... >When you say you built a debug kernel, does that include option >WITNESS_KDB? If so, remove that so you can find the real error. LORs >related to ufs_dirhash have been reported for years, and nobody with >the >appropriate skills seems to be interested in fixing them; they just get >declared to be harmless. I will try that as soon as I can. Currently after every little fs operation, I am thrown in debugger-reboot-fsck cycle. As such I cannot do anything. This is my own damn fault because the non-debug kernel would run for some random but meaningful amount of time before crash & reboot. I tried booting /boot/kernel.old/kernel from boot prompt but that presented debugger soon after boot. BTW is it possible to set kernel.old to boot next time at boot prompt? --