From owner-freebsd-bugs@FreeBSD.ORG Wed Sep 13 23:10:19 2006 Return-Path: X-Original-To: freebsd-bugs@hub.freebsd.org Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 328A716A570 for ; Wed, 13 Sep 2006 23:10:19 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 97EBA43D49 for ; Wed, 13 Sep 2006 23:10:18 +0000 (GMT) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id k8DNAIcD043623 for ; Wed, 13 Sep 2006 23:10:18 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id k8DNAIHb043622; Wed, 13 Sep 2006 23:10:18 GMT (envelope-from gnats) Resent-Date: Wed, 13 Sep 2006 23:10:18 GMT Resent-Message-Id: <200609132310.k8DNAIHb043622@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Martin Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8DB3A16A407 for ; Wed, 13 Sep 2006 23:02:36 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [216.136.204.117]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6086343D45 for ; Wed, 13 Sep 2006 23:02:36 +0000 (GMT) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.13.1/8.13.1) with ESMTP id k8DN2aV5044530 for ; Wed, 13 Sep 2006 23:02:36 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.13.1/8.13.1/Submit) id k8DN2aWC044529; Wed, 13 Sep 2006 23:02:36 GMT (envelope-from nobody) Message-Id: <200609132302.k8DN2aWC044529@www.freebsd.org> Date: Wed, 13 Sep 2006 23:02:36 GMT From: Martin To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-2.3 Cc: Subject: kern/103245: mount -o rw, umount may panic system X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Sep 2006 23:10:19 -0000 >Number: 103245 >Category: kern >Synopsis: mount -o rw, umount may panic system >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Sep 13 23:10:17 GMT 2006 >Closed-Date: >Last-Modified: >Originator: Martin >Release: FreeBSD 6.1R >Organization: >Environment: FreeBSD 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Sat May 13 00:26:37 CEST 2006 >Description: Under certain circumstances, it is possible to cause a panic while remounting and unmounting an originally read-only mounted UFS file system. >How-To-Repeat: fstab which I'm using contains entries to my old FreeBSD installation: [...] /dev/ad0s3a /freebsd-old ufs ro 0 0 /dev/ad0s3f /freebsd-old/var ufs ro 0 0 /dev/ad0s3d /freebsd-old/usr ufs ro 0 0 /dev/ad0s3e /freebsd-old/usr/home ufs ro 0 0 Everything is read-only and mounted after boot. Now, try to remount: # mount -o rw /freebsd-old/usr/home # mount [...] /dev/ad0s3a on /freebsd-old (ufs, local, read-only) /dev/ad0s3f on /freebsd-old/var (ufs, local, read-only) /dev/ad0s3d on /freebsd-old/usr (ufs, local, read-only) /dev/ad0s3e on /freebsd-old/usr/home (ufs, local, read-only) /dev/ad0s3e on /freebsd-old/usr/home (ufs, local, read-only) You see two entries of /dev/ad0s3e, both of them read-only. From here on, try a few more "mount -o rw /freebsd-old/usr/home" and "umount /freebsd-old/usr/home". This will result in a panic. (Note: # mount -o rw /dev/ad0s3e /freebsd-old/usr/home mount: /dev/ad0s3e: Operation not permitted Please reproduce it, exactly with the steps above. ) >Fix: >Release-Note: >Audit-Trail: >Unformatted: