From owner-svn-src-head@freebsd.org Fri Apr 14 17:08:38 2017 Return-Path: Delivered-To: svn-src-head@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 CEF6BD3D4EC; Fri, 14 Apr 2017 17:08:38 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (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 9F221F7; Fri, 14 Apr 2017 17:08:38 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v3EH8bLb035394; Fri, 14 Apr 2017 17:08:37 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v3EH8beb035393; Fri, 14 Apr 2017 17:08:37 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201704141708.v3EH8beb035393@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Fri, 14 Apr 2017 17:08:37 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r316867 - head/sys/geom/mirror X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Apr 2017 17:08:38 -0000 Author: markj Date: Fri Apr 14 17:08:37 2017 New Revision: 316867 URL: https://svnweb.freebsd.org/changeset/base/316867 Log: Don't set the mirror GEOM softc to NULL in g_mirror_destroy(). At this point we have not rendezvous'ed with the mirror worker thread, and I/O may still be in flight. Various I/O completion paths expect to be able to obtain a reference to the mirror softc from the GEOM, so setting it to NULL may result in various NULL pointer dereferences if the mirror is stopped with -f or the kernel is shut down while a mirror is synchronizing. The worker thread will clear the softc pointer before exiting. Tested by: pho MFC after: 2 weeks Sponsored by: Dell EMC Isilon Modified: head/sys/geom/mirror/g_mirror.c Modified: head/sys/geom/mirror/g_mirror.c ============================================================================== --- head/sys/geom/mirror/g_mirror.c Fri Apr 14 17:03:32 2017 (r316866) +++ head/sys/geom/mirror/g_mirror.c Fri Apr 14 17:08:37 2017 (r316867) @@ -3076,15 +3076,8 @@ g_mirror_destroy(struct g_mirror_softc * } } - g_topology_lock(); - if (sc->sc_geom->softc == NULL) { - g_topology_unlock(); + if ((sc->sc_flags & G_MIRROR_DEVICE_FLAG_DESTROY) != 0) return (0); - } - sc->sc_geom->softc = NULL; - sc->sc_sync.ds_geom->softc = NULL; - g_topology_unlock(); - sc->sc_flags |= G_MIRROR_DEVICE_FLAG_DESTROY; sc->sc_flags |= G_MIRROR_DEVICE_FLAG_WAIT; G_MIRROR_DEBUG(4, "%s: Waking up %p.", __func__, sc);