From owner-freebsd-stable@freebsd.org Thu Aug 24 20:11:01 2017 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 15FFADE74B0 for ; Thu, 24 Aug 2017 20:11:01 +0000 (UTC) (envelope-from mike@sentex.net) Received: from smarthost2.sentex.ca (smarthost2.sentex.ca [IPv6:2607:f3e0:80:80::2]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "smarthost.sentex.ca", Issuer "smarthost.sentex.ca" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id D7CE064792 for ; Thu, 24 Aug 2017 20:11:00 +0000 (UTC) (envelope-from mike@sentex.net) Received: from lava.sentex.ca (lava.sentex.ca [IPv6:2607:f3e0:0:5::11]) by smarthost2.sentex.ca (8.15.2/8.15.2) with ESMTPS id v7OKAx4a065276 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Thu, 24 Aug 2017 16:10:59 -0400 (EDT) (envelope-from mike@sentex.net) Received: from [192.168.43.26] (saphire3.sentex.ca [192.168.43.26]) by lava.sentex.ca (8.15.2/8.15.2) with ESMTP id v7OKAvCx055782 for ; Thu, 24 Aug 2017 16:10:57 -0400 (EDT) (envelope-from mike@sentex.net) Subject: Re: file system deadlock in RELENG_11 From: Mike Tancsa To: FreeBSD-STABLE Mailing List References: <66b97b27-cbea-a3a8-374d-3f7c017b5418@sentex.net> <28c89f80-4797-7e95-a637-472ac7bc98a5@sentex.net> Organization: Sentex Communications Message-ID: <4ec50e48-58a5-1f49-3acf-d3b21535c36e@sentex.net> Date: Thu, 24 Aug 2017 16:10:57 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <28c89f80-4797-7e95-a637-472ac7bc98a5@sentex.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.78 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Aug 2017 20:11:01 -0000 On 8/24/2017 4:01 PM, Mike Tancsa wrote: > OK, this is fairly easy to repeat. If I start a sync of a snapshot via > zrep, it hangs the box. CTRL+T shows > > > DEBUG: overiding stale lock on zroot/chyves from pid 19378 > sending zroot/chyves@zrep_000010 to 10.151.9.2:zroot/chyves > cannot receive new filesystem stream: destination > 'zroot/chyves/guests/resi/disk1' exists > must specify -F to overwrite it > ^C > load: 0.48 cmd: zfs 29690 [tx->tx_sync_done_cv] 358.94r 0.00u 0.00s 0% > 3476k > load: 0.48 cmd: zfs 29690 [tx->tx_sync_done_cv] 360.42r 0.00u 0.00s 0% I was able to get ps to run and not sure if its helpful or not, but these are the two unkillable zfs processes root 5 0.0 0.0 0 128 - DL 10:09 0:05.58 [zfskern] root 29683 0.0 0.0 7752 3824 5 DE+ 15:53 0:00.32 zfs send -R -I zroot/chyves@zrep_00000d zroot/chyves@zrep_000010 root 29690 0.0 0.0 7752 3492 5 D+ 15:53 0:00.00 zfs rename zroot/chyves@zrep_000010 zroot/chyves@zrep_000010_unsent -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/