From owner-svn-src-head@freebsd.org  Fri Oct 20 18:58:12 2017
Return-Path: <owner-svn-src-head@freebsd.org>
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 46D72E3D57F;
 Fri, 20 Oct 2017 18:58:12 +0000 (UTC) (envelope-from mjg@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 162392D17;
 Fri, 20 Oct 2017 18:58:12 +0000 (UTC) (envelope-from mjg@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v9KIwBwB002445;
 Fri, 20 Oct 2017 18:58:11 GMT (envelope-from mjg@FreeBSD.org)
Received: (from mjg@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v9KIwBKB002444;
 Fri, 20 Oct 2017 18:58:11 GMT (envelope-from mjg@FreeBSD.org)
Message-Id: <201710201858.v9KIwBKB002444@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: mjg set sender to mjg@FreeBSD.org
 using -f
From: Mateusz Guzik <mjg@FreeBSD.org>
Date: Fri, 20 Oct 2017 18:58:11 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r324808 - head/sys/amd64/amd64
X-SVN-Group: head
X-SVN-Commit-Author: mjg
X-SVN-Commit-Paths: head/sys/amd64/amd64
X-SVN-Commit-Revision: 324808
X-SVN-Commit-Repository: base
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
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 20 Oct 2017 18:58:12 -0000

Author: mjg
Date: Fri Oct 20 18:58:11 2017
New Revision: 324808
URL: https://svnweb.freebsd.org/changeset/base/324808

Log:
  amd64: plug missed dt_lock in cpu_fork

Modified:
  head/sys/amd64/amd64/vm_machdep.c

Modified: head/sys/amd64/amd64/vm_machdep.c
==============================================================================
--- head/sys/amd64/amd64/vm_machdep.c	Fri Oct 20 18:40:29 2017	(r324807)
+++ head/sys/amd64/amd64/vm_machdep.c	Fri Oct 20 18:58:11 2017	(r324808)
@@ -244,6 +244,10 @@ cpu_fork(struct thread *td1, struct proc *p2, struct t
 	/* Copy the LDT, if necessary. */
 	mdp1 = &td1->td_proc->p_md;
 	mdp2 = &p2->p_md;
+	if (mdp1->md_ldt == NULL) {
+		mdp2->md_ldt = NULL;
+		return;
+	}
 	mtx_lock(&dt_lock);
 	if (mdp1->md_ldt != NULL) {
 		if (flags & RFMEM) {