From owner-svn-src-all@freebsd.org Thu Aug 13 22:06:27 2020 Return-Path: Delivered-To: svn-src-all@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 D141E3ADEC1; Thu, 13 Aug 2020 22:06:27 +0000 (UTC) (envelope-from bdrewery@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (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-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BSLJ359kSz3fBv; Thu, 13 Aug 2020 22:06:27 +0000 (UTC) (envelope-from bdrewery@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 mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 95F8923FDE; Thu, 13 Aug 2020 22:06:27 +0000 (UTC) (envelope-from bdrewery@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07DM6RYd018725; Thu, 13 Aug 2020 22:06:27 GMT (envelope-from bdrewery@FreeBSD.org) Received: (from bdrewery@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07DM6R5O018724; Thu, 13 Aug 2020 22:06:27 GMT (envelope-from bdrewery@FreeBSD.org) Message-Id: <202008132206.07DM6R5O018724@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: bdrewery set sender to bdrewery@FreeBSD.org using -f From: Bryan Drewery Date: Thu, 13 Aug 2020 22:06:27 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r364220 - head/sys/net X-SVN-Group: head X-SVN-Commit-Author: bdrewery X-SVN-Commit-Paths: head/sys/net X-SVN-Commit-Revision: 364220 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Aug 2020 22:06:27 -0000 Author: bdrewery Date: Thu Aug 13 22:06:27 2020 New Revision: 364220 URL: https://svnweb.freebsd.org/changeset/base/364220 Log: lagg: Avoid adding a port to a lagg device being destroyed. The lagg_clone_destroy() handles detach and waiting for ifconfig callers to drain already. This narrows the race for 2 panics that the tests triggered. Both were a consequence of adding a port to the lagg device after it had already detached from all of its ports. The link state task would run after lagg_clone_destroy() free'd the lagg softc. kernel:trap_fatal+0xa4 kernel:trap_pfault+0x61 kernel:trap+0x316 kernel:witness_checkorder+0x6d kernel:_sx_xlock+0x72 if_lagg.ko:lagg_port_state+0x3b kernel:if_down+0x144 kernel:if_detach+0x659 if_tap.ko:tap_destroy+0x46 kernel:if_clone_destroyif+0x1b7 kernel:if_clone_destroy+0x8d kernel:ifioctl+0x29c kernel:kern_ioctl+0x2bd kernel:sys_ioctl+0x16d kernel:amd64_syscall+0x337 kernel:trap_fatal+0xa4 kernel:trap_pfault+0x61 kernel:trap+0x316 kernel:witness_checkorder+0x6d kernel:_sx_xlock+0x72 if_lagg.ko:lagg_port_state+0x3b kernel:do_link_state_change+0x9b kernel:taskqueue_run_locked+0x10b kernel:taskqueue_run+0x49 kernel:ithread_loop+0x19c kernel:fork_exit+0x83 PR: 244168 Reviewed by: markj MFC after: 2 weeks Sponsored by: Dell EMC Differential Revision: https://reviews.freebsd.org/D25284 Modified: head/sys/net/if_lagg.c Modified: head/sys/net/if_lagg.c ============================================================================== --- head/sys/net/if_lagg.c Thu Aug 13 20:48:14 2020 (r364219) +++ head/sys/net/if_lagg.c Thu Aug 13 22:06:27 2020 (r364220) @@ -679,6 +679,9 @@ lagg_port_create(struct lagg_softc *sc, struct ifnet * return (EINVAL); } + if (sc->sc_destroying == 1) + return (ENXIO); + /* Limit the maximal number of lagg ports */ if (sc->sc_count >= LAGG_MAX_PORTS) return (ENOSPC); @@ -1190,6 +1193,8 @@ lagg_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data int count, buflen, len, error = 0, oldmtu; bzero(&rpbuf, sizeof(rpbuf)); + + /* XXX: This can race with lagg_clone_destroy. */ switch (cmd) { case SIOCGLAGG: