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From: "Conrad E. Meyer" <cem@FreeBSD.org>
Date: Mon, 1 Aug 2016 23:07:32 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r303651 - head/sys/net
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Author: cem
Date: Mon Aug  1 23:07:31 2016
New Revision: 303651
URL: https://svnweb.freebsd.org/changeset/base/303651

Log:
  rtentry: Initialize rt_mtx with MTX_NEW
  
  The "rtentry" zone does not use UMA_ZONE_ZINIT, so it is invalid to assume the
  mutex's memory will be zero.  Without MTX_NEW, garbage backing memory may
  trigger the "re-initializing a mutex" assertion.
  
  PR:		200991
  Submitted by:	Chang-Hsien Tsai <luke.tw AT gmail.com>

Modified:
  head/sys/net/route.h

Modified: head/sys/net/route.h
==============================================================================
--- head/sys/net/route.h	Mon Aug  1 22:57:03 2016	(r303650)
+++ head/sys/net/route.h	Mon Aug  1 23:07:31 2016	(r303651)
@@ -360,7 +360,7 @@ struct rt_addrinfo {
 				 || (ifp)->if_link_state == LINK_STATE_UP)
 
 #define	RT_LOCK_INIT(_rt) \
-	mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK)
+	mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK | MTX_NEW)
 #define	RT_LOCK(_rt)		mtx_lock(&(_rt)->rt_mtx)
 #define	RT_UNLOCK(_rt)		mtx_unlock(&(_rt)->rt_mtx)
 #define	RT_LOCK_DESTROY(_rt)	mtx_destroy(&(_rt)->rt_mtx)