From owner-svn-src-all@FreeBSD.ORG  Fri Jun 29 17:12:26 2012
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id BC313106570F;
	Fri, 29 Jun 2012 17:12:26 +0000 (UTC) (envelope-from jhb@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id A6B6F8FC16;
	Fri, 29 Jun 2012 17:12:26 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q5THCQd1058503;
	Fri, 29 Jun 2012 17:12:26 GMT (envelope-from jhb@svn.freebsd.org)
Received: (from jhb@localhost)
	by svn.freebsd.org (8.14.4/8.14.4/Submit) id q5THCQ9U058501;
	Fri, 29 Jun 2012 17:12:26 GMT (envelope-from jhb@svn.freebsd.org)
Message-Id: <201206291712.q5THCQ9U058501@svn.freebsd.org>
From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 29 Jun 2012 17:12:26 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org
X-SVN-Group: stable-8
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r237804 - stable/8/sys/vm
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 29 Jun 2012 17:12:26 -0000

Author: jhb
Date: Fri Jun 29 17:12:26 2012
New Revision: 237804
URL: http://svn.freebsd.org/changeset/base/237804

Log:
  MFC 237334:
  Move the per-thread deferred user map entries list into a private list
  in vm_map_process_deferred() which is then iterated to release map entries.
  This avoids having a nested vm map unlock operation called from the loop
  body attempt to recuse into vm_map_process_deferred().  This can happen if
  the vm_map_remove() triggers the OOM killer.

Modified:
  stable/8/sys/vm/vm_map.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/boot/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/e1000/   (props changed)

Modified: stable/8/sys/vm/vm_map.c
==============================================================================
--- stable/8/sys/vm/vm_map.c	Fri Jun 29 17:12:03 2012	(r237803)
+++ stable/8/sys/vm/vm_map.c	Fri Jun 29 17:12:26 2012	(r237804)
@@ -457,13 +457,15 @@ static void
 vm_map_process_deferred(void)
 {
 	struct thread *td;
-	vm_map_entry_t entry;
+	vm_map_entry_t entry, next;
 
 	td = curthread;
-
-	while ((entry = td->td_map_def_user) != NULL) {
-		td->td_map_def_user = entry->next;
+	entry = td->td_map_def_user;
+	td->td_map_def_user = NULL;
+	while (entry != NULL) {
+		next = entry->next;
 		vm_map_entry_deallocate(entry, FALSE);
+		entry = next;
 	}
 }