From owner-freebsd-stable@FreeBSD.ORG Tue Nov 30 01:24:17 2010 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 813A71065742 for ; Tue, 30 Nov 2010 01:24:17 +0000 (UTC) (envelope-from mcdouga9@egr.msu.edu) Received: from mail.egr.msu.edu (boomhauer.egr.msu.edu [35.9.37.167]) by mx1.freebsd.org (Postfix) with ESMTP id 3D9308FC14 for ; Tue, 30 Nov 2010 01:24:16 +0000 (UTC) Received: from boomhauer (localhost [127.0.0.1]) by mail.egr.msu.edu (Postfix) with ESMTP id 95AE2429C0 for ; Mon, 29 Nov 2010 20:06:54 -0500 (EST) X-Virus-Scanned: amavisd-new at egr.msu.edu Received: from mail.egr.msu.edu ([127.0.0.1]) by boomhauer (boomhauer.egr.msu.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GqvQHdshHmbg for ; Mon, 29 Nov 2010 20:06:54 -0500 (EST) Received: from [35.9.44.65] (daemon.egr.msu.edu [35.9.44.65]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: mcdouga9) by mail.egr.msu.edu (Postfix) with ESMTPSA id 6E308429BA for ; Mon, 29 Nov 2010 20:06:54 -0500 (EST) Message-ID: <4CF44E2E.4070700@egr.msu.edu> Date: Mon, 29 Nov 2010 20:06:54 -0500 From: Adam McDougall User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.2.12) Gecko/20101104 Thunderbird/3.1.6 MIME-Version: 1.0 To: stable@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Subject: Stale NFS file handles on 8.x amd64 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Nov 2010 01:24:17 -0000 I've been running dovecot 1.1 on FreeBSD 7.x for a while with a bare minimum of NFS problems, but it got worse with 8.x. I have 2-4 servers (usually just 2) accessing mail on a Netapp over NFSv3 via imapd. delivery is via procmail which doesn't touch the dovecot metadata and webmail uses imapd. Client connections to imapd go to random servers and I don't yet have solid means to keep certain users on certain servers. I upgraded some of the servers to 8.x and dovecot 1.2 and ran into Stale NFS file handles causing index/uidlist corruption causing inboxes to appear as empty when they were not. In some situations their corrupt index had to be deleted manually. I first suspected dovecot 1.2 since it was upgraded at the same time but I downgraded to 1.1 and its doing the same thing. I don't really have a wealth of details to go on yet and I usually stay quiet until I do, and half the time it is difficult to reproduce myself so I've had to put it in production to get a feel for progress. This only happens a dozen or so times per weekday but I feel the need to start taking bigger steps. I'll probably do what I can to get IMAP back on a stable base (7.x?) and also try to debug 8.x on the remaining servers. A binary search is within possibility if I can reproduce the symptoms often enough even if I have to put a test server in production for a few hours. Any tips on where we could start looking, or alterations I could try making such as sysctls to return to older behavior? It might be worth noting that I've seen a considerable increase in traffic from my mail servers since the 8.x upgrade timeframe, on the order of 5-10x as much traffic to the NFS server. dovecot tries its hardest to flush out the access cache when needed and it was working well enough since about 1.0.16 (years ago). It seems like FreeBSD is what regressed in this scenario. dovecot 2.x is going in a different direction from my situation and I'm not ready to start testing that immediately if I can avoid it as it will involve some restructuring. Thanks for any input. For now the following errors are about all I have to go on: Nov 29 11:07:54 server1 dovecot: IMAP(user1): o_stream_send(/home/user1/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle Nov 29 13:19:51 server1 dovecot: IMAP(user1): o_stream_send(/home/user1/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle Nov 29 14:35:41 server1 dovecot: IMAP(user2): o_stream_send(/home/user2/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle Nov 29 15:07:05 server1 dovecot: IMAP(user3): read(mail, uid=128990) failed: Stale NFS file handle Nov 29 11:57:22 server2 dovecot: IMAP(user4): open(/egr/mail/shared/vprgs/dovecot-acl-list) failed: Stale NFS file handle Nov 29 14:04:22 server2 dovecot: IMAP(user5): o_stream_send(/home/user5/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle Nov 29 14:27:21 server2 dovecot: IMAP(user6): o_stream_send(/home/user6/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle Nov 29 15:44:38 server2 dovecot: IMAP(user7): open(/egr/mail/shared/decs/dovecot-acl-list) failed: Stale NFS file handle Nov 29 19:04:54 server2 dovecot: IMAP(user8): o_stream_send(/home/user8/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle Nov 29 06:32:11 server3 dovecot: IMAP(user9): open(/egr/mail/shared/cmsc/dovecot-acl-list) failed: Stale NFS file handle Nov 29 10:03:58 server3 dovecot: IMAP(user10): o_stream_send(/home/user10/Maildir/dovecot/private/control/.INBOX/dovecot-uidlist) failed: Stale NFS file handle