From owner-freebsd-fs@freebsd.org Wed Jul 25 01:38:38 2018 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6B2BB1035CD3 for ; Wed, 25 Jul 2018 01:38:38 +0000 (UTC) (envelope-from mi+thun@aldan.algebra.com) 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 E5A60898CF for ; Wed, 25 Jul 2018 01:38:37 +0000 (UTC) (envelope-from mi+thun@aldan.algebra.com) Received: by mailman.ysv.freebsd.org (Postfix) id A748D1035CD1; Wed, 25 Jul 2018 01:38:37 +0000 (UTC) Delivered-To: fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 6A01F1035CD0; Wed, 25 Jul 2018 01:38:37 +0000 (UTC) (envelope-from mi+thun@aldan.algebra.com) Received: from natasha.teterin.net (symbion.zaytman.com [64.112.176.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "symbion", Issuer "Narawntapu" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 080AE898CE; Wed, 25 Jul 2018 01:38:33 +0000 (UTC) (envelope-from mi+thun@aldan.algebra.com) Received: from narawntapu.narawntapu (pool-108-53-87-28.nwrknj.fios.verizon.net [108.53.87.28]) by natasha.teterin.net (8.15.2/8.15.2) with ESMTPS id w6P1cWGr009103 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 24 Jul 2018 21:38:32 -0400 (EDT) (envelope-from mi+thun@aldan.algebra.com) X-Authentication-Warning: natasha.teterin.net: Host pool-108-53-87-28.nwrknj.fios.verizon.net [108.53.87.28] claimed to be narawntapu.narawntapu Received: from [127.0.0.1] (localhost [127.0.0.1]) by narawntapu.narawntapu (8.15.2/8.15.2) with ESMTP id w6P1cQf9050508; Tue, 24 Jul 2018 21:38:26 -0400 (EDT) (envelope-from mi+thun@aldan.algebra.com) X-Authentication-Warning: narawntapu.narawntapu: Host localhost [127.0.0.1] claimed to be [127.0.0.1] To: stable@freebsd.org, fs@freebsd.org From: "Mikhail T." Subject: core dumps onto ZFS Message-ID: Date: Tue, 24 Jul 2018 21:38:26 -0400 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 Content-Language: en-US X-DCC-dmv.com-Metrics: narawntapu 1095; Body=2 Fuz1=2 Fuz2=2 X-Spam-Status: No, score=-2.9 required=7.5 tests=ALL_TRUSTED,BAYES_00, HTML_MESSAGE autolearn=ham autolearn_force=no version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on narawntapu.narawntapu Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit X-Content-Filtered-By: Mailman/MimeDel 2.1.27 X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jul 2018 01:38:38 -0000 Hello! Last night I was trying to get KDE5 to start up on my new machine, and a couple of KDE's processes kept crashing, dumping cores like the one below: -rw-------  1 mi    wheel  45780992 Jul 23 22:28 ksplashqml.core After, maybe, 10 such rounds -- each generating two core-dump -- ZFS hung... The machine was otherwise responsive, but any attempts to access the ZFS filesystems would hang as NFS would, when the remote server stops responding... Pressing Ctrl-T would show the process in the state named "zfs". According to "systat -vm", all four disks involved in the raidz1 were writing in excess of 100MB/s, so I let it be for a few minutes, but nothing improved -- and the writes continued... I pressed Ctrl-Alt-Del, which initiated a shutdown, but the shutdown hung as well ("some processes would not die") and I had to do a power cycle... The sole zpool consists of 4 3TB drives and a 16GB log (on an SSD) thus:         NAME        STATE     READ WRITE CKSUM         aldan       ONLINE       0     0     0           raidz1-0  ONLINE       0     0     0             da0     ONLINE       0     0     0             ada1    ONLINE       0     0     0             da2     ONLINE       0     0     0             da1     ONLINE       0     0     0         logs           ada0e     ONLINE       0     0     0 It reports no data-errors after reboot. There are multiple filesystems on it, among them /home. The box is running a very recent FreeBSD-11/amd64 (r336626). It has 4 Xeon cores and 128GB of RAM. The pool was created under FreeBSD-10 -- after this incident I upgraded it. What happened? Thanks! Yours, -mi