From owner-freebsd-bugs@freebsd.org Sun Oct 16 23:41:20 2016 Return-Path: Delivered-To: freebsd-bugs@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 6AA5BC14803 for ; Sun, 16 Oct 2016 23:41:20 +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 mx1.freebsd.org (Postfix) with ESMTPS id 425781D92 for ; Sun, 16 Oct 2016 23:41:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u9GNfKqN092655 for ; Sun, 16 Oct 2016 23:41:20 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 213549] /etc/rc remounts root readonly if /firstboot exists Date: Sun, 16 Oct 2016 23:41:20 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: conf X-Bugzilla-Version: 11.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: mcdouga9@egr.msu.edu X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: 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-bugs@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 16 Oct 2016 23:41:20 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D213549 Bug ID: 213549 Summary: /etc/rc remounts root readonly if /firstboot exists Product: Base System Version: 11.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: conf Assignee: freebsd-bugs@FreeBSD.org Reporter: mcdouga9@egr.msu.edu I have some custom system setup scripts that leverage "firstboot" support b= ut I discovered problems when trying them on FreeBSD 11 -stable and -release. The short version is /etc/rc attempts to remount the / partition as readonly (r= o) at the end after it deletes /firstboot. I think this issue originated with: https://svnweb.freebsd.org/base?view=3Drevision&revision=3D293115 Abbreviated code: if [ -e ${firstboot_sentinel} ]; then [ ${root_rw_mount} =3D "yes" ] || mount -uw / chflags -R 0 ${firstboot_sentinel} rm -rf ${firstboot_sentinel} [ ${root_rw_mount} =3D "yes" ] || mount -ur / fi On a stock FreeBSD 11 install, if you touch /firstboot and reboot, here are= the results: UFS: prints "mount: /dev/vtbd0s1a: Device busy" late during boot but no apparent harm ZFS: succeeds in remounting / as ro even if it was rw to start with Depending on your system configuration you might notice the issue immediate= ly on the console, for example programs which need to write to / will start complaining. You can login and run mount -v to verify. Other random things = fail such as recording your login in 'w' output. I do not use ${firstboot_sentinel}-reboot which might be why this was not discovered, as= a reboot makes the problem go away but I do not want to reboot. Quick hack of a fix for me: comment out the last line containing "mount -ur= /" but this is not a proper fix. --=20 You are receiving this mail because: You are the assignee for the bug.=