From owner-freebsd-current@freebsd.org Mon Oct 12 15:27:31 2020 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 8364543A728 for ; Mon, 12 Oct 2020 15:27:31 +0000 (UTC) (envelope-from eric@vangyzen.net) Received: from smtp.vangyzen.net (hotblack.vangyzen.net [199.48.133.146]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4C92c16nPmz4LWb for ; Mon, 12 Oct 2020 15:27:29 +0000 (UTC) (envelope-from eric@vangyzen.net) Received: from disco.vangyzen.net (unknown [70.97.188.230]) by smtp.vangyzen.net (Postfix) with ESMTPSA id 4971D56477 for ; Mon, 12 Oct 2020 10:27:23 -0500 (CDT) Subject: Re: ZFS crash -- zvol_geom_bio_getattr called when volmode=dev To: freebsd-current@freebsd.org References: <1dfaf797-f23b-af97-d2d3-efa0f5bb88d9@vangyzen.net> <95636bbf-2367-f226-f462-d5581581c18f@vangyzen.net> <74ba295a-1f67-5109-0a21-9662eac0334b@vangyzen.net> From: Eric van Gyzen Message-ID: <9a140b74-de79-60d5-f5c8-b2a2676dbbea@vangyzen.net> Date: Mon, 12 Oct 2020 10:27:17 -0500 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 MIME-Version: 1.0 In-Reply-To: <74ba295a-1f67-5109-0a21-9662eac0334b@vangyzen.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4C92c16nPmz4LWb X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.02 / 15.00]; RCVD_TLS_ALL(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_SPAM_SHORT(0.10)[0.100]; FREEFALL_USER(0.00)[eric]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-0.92)[-0.919]; ARC_NA(0.00)[]; R_SPF_ALLOW(-0.20)[+a]; DMARC_NA(0.00)[vangyzen.net]; NEURAL_HAM_MEDIUM(-0.90)[-0.901]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:36236, ipnet:199.48.132.0/22, country:US]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-current] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Oct 2020 15:27:31 -0000 On 10/9/20 7:54 PM, Eric van Gyzen wrote: > On 10/9/20 6:27 PM, Ryan Moeller wrote: >> >> On 10/9/20 6:22 PM, Alan Somers wrote: >>> This sounds like it might be a regression introduced by the OpenZFS >>> merge. >>> Have you compared vdev_geom.c in OpenZFS vs the old version? >>> -Alan >> >> >> I don't think vdev_geom.c is involved, we're taking a wrong path in >> zvol_os.c because >> it seems the volume is created using the default volmode and later >> changed to volmode=dev. > > Yes, you're on the right track.  I tried this several times on a VM and > it eventually hit the window: > > # zfs create -s -V 20G -o primarycache=none -o volmode=dev > head_root/testvol > zvol_create_minor_impl:1250[1]: Creating ZVOL head_root/testvol... > zvol_create_minor_impl:1371[1]: ZVOL head_root/testvol created. > > > Fatal trap 12: page fault while in kernel mode Let's track this in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250297 Eric