From owner-freebsd-current@freebsd.org Wed Feb 3 01:23:05 2016 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 A5F48A99382 for ; Wed, 3 Feb 2016 01:23:05 +0000 (UTC) (envelope-from jtl@freebsd.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 5D68CF30 for ; Wed, 3 Feb 2016 01:23:05 +0000 (UTC) (envelope-from jtl@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 596ECA9937F; Wed, 3 Feb 2016 01:23:05 +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 58F19A9937D for ; Wed, 3 Feb 2016 01:23:05 +0000 (UTC) (envelope-from jtl@freebsd.org) Received: from na01-by2-obe.outbound.protection.outlook.com (mail-by2on0137.outbound.protection.outlook.com [207.46.100.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client CN "mail.protection.outlook.com", Issuer "MSIT Machine Auth CA 2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 1183CF2F for ; Wed, 3 Feb 2016 01:23:04 +0000 (UTC) (envelope-from jtl@freebsd.org) Received: from BY1PR0501CA0032.namprd05.prod.outlook.com (10.162.139.42) by BY1PR0501MB1382.namprd05.prod.outlook.com (10.160.107.140) with Microsoft SMTP Server (TLS) id 15.1.396.15; Wed, 3 Feb 2016 01:08:26 +0000 Received: from BN1BFFO11FD025.protection.gbl (2a01:111:f400:7c10::1:100) by BY1PR0501CA0032.outlook.office365.com (2a01:111:e400:4821::42) with Microsoft SMTP Server (TLS) id 15.1.403.16 via Frontend Transport; Wed, 3 Feb 2016 01:08:26 +0000 Authentication-Results: spf=softfail (sender IP is 66.129.239.18) smtp.mailfrom=freebsd.org; gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=freebsd.org; Received-SPF: SoftFail (protection.outlook.com: domain of transitioning freebsd.org discourages use of 66.129.239.18 as permitted sender) Received: from p-emfe01a-sac.jnpr.net (66.129.239.18) by BN1BFFO11FD025.mail.protection.outlook.com (10.58.144.88) with Microsoft SMTP Server (TLS) id 15.1.409.7 via Frontend Transport; Wed, 3 Feb 2016 01:08:25 +0000 Received: from magenta.juniper.net (172.17.27.123) by p-emfe01a-sac.jnpr.net (172.24.192.21) with Microsoft SMTP Server (TLS) id 14.3.123.3; Tue, 2 Feb 2016 17:08:21 -0800 Received: from [172.29.37.171] ([172.29.37.171]) by magenta.juniper.net (8.11.3/8.11.3) with ESMTP id u1318GD63973; Tue, 2 Feb 2016 17:08:18 -0800 (PST) (envelope-from jtl@freebsd.org) User-Agent: Microsoft-MacOutlook/14.6.0.151221 Date: Tue, 2 Feb 2016 20:08:14 -0500 Subject: Re: Occasional crashes, Bug or dying disk? From: "Jonathan T. Looney" Sender: Jonathan Looney To: Christian Walther CC: "current@freebsd.org" Message-ID: Thread-Topic: Occasional crashes, Bug or dying disk? 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I (and several others) spent time trying to track down "the bug" causing panics like this on a particular set of hardware. I finally wrote a program that wrote and read byte patterns from the disk (using O_DIRECT). I found that what the program read back didn't match what it wrote. In circumstances like that, you can't expect any filesystem to work reliably. Given the long pedigree of the UFS/FFS code, I think it is much more likely to be a hardware problem than a problem with the UFS/FFS code. Jonathan