From owner-freebsd-doc@freebsd.org Mon Mar 19 09:44:16 2018 Return-Path: Delivered-To: freebsd-doc@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 D7237F60493 for ; Mon, 19 Mar 2018 09:44:15 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 71ACC8649E for ; Mon, 19 Mar 2018 09:44:15 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 9B74222EED for ; Mon, 19 Mar 2018 09:44:14 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w2J9iE6U027660 for ; Mon, 19 Mar 2018 09:44:14 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w2J9iELY027651 for freebsd-doc@FreeBSD.org; Mon, 19 Mar 2018 09:44:14 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: freebsd-doc@FreeBSD.org Subject: [Bug 226714] zfsboot(8) erroneously suggests creating a BSD label Date: Mon, 19 Mar 2018 09:44:12 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Documentation X-Bugzilla-Component: Documentation X-Bugzilla-Version: Latest X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: eugen@freebsd.org X-Bugzilla-Status: Open X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-doc@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc bug_status Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-doc@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Documentation project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Mar 2018 09:44:16 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D226714 Eugene Grosbein changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |avg@FreeBSD.org, | |eugen@freebsd.org, | |imp@FreeBSD.org Status|New |Open --- Comment #1 from Eugene Grosbein --- This is what happens inside: zfsboot normally reads zfsloader from active s= lice containing ZFS boot pool and starts it. zfsloader tastes all slices using zfs_probe_partition() function from sys/boot/zfs/zfs.c that calls open(devname, O_RDONLY). open(devname, O_RDONLY) returns -1/ENOENT for a slice that has traces of BSD label, so zfsloader fails to find bootable ZFS pool. This is libstand's ope= n() call in stable/11. It returns -1 if detects "DISKMAGIC ((u_int32_t)0x825645= 57) /* The disk magic number */" in the second sector of a slice. One can use tools/tools/bootparttest to see if that is the case, for exampl= e: disk0s2: FreeBSD 2047MB read 512 bytes from the block 0 [+16777720] read 512 bytes from the block 1 [+16777720] ptable_bsdread: BSD detected disk_close: disk0: closed =3D> 0x801621000 [1] In fact, disk0s2 contains ZFS boot pool and DISKMAGIC in the second sector. Easiest fix would be to replace "dd if=3D/boot/zfsboot of=3D/dev/ada0s1 cou= nt=3D1" with "dd if=3D/boot/zfsboot of=3D/dev/ada0s1 count=3D2" in the docs to make= sure that second sector has no traces of BSD label. --=20 You are receiving this mail because: You are the assignee for the bug.=