From a5c80f893edbf44d70336e8a3d558bac9d057929 Mon Sep 17 00:00:00 2001
From: Jason Evans <je@fb.com>
Date: Mon, 15 Oct 2012 12:48:59 -0700
Subject: [PATCH] Add ctl_mutex proection to arena_i_dss_ctl().

Add ctl_mutex proection to arena_i_dss_ctl(), since ctl_stats.narenas is
accessed.
---
 src/ctl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ctl.c b/src/ctl.c
index 30a5a46a..e3ab9da9 100644
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -1330,6 +1330,7 @@ arena_i_dss_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 	dss_prec_t dss_prec_old = dss_prec_limit;
 	dss_prec_t dss_prec = dss_prec_limit;
 
+	malloc_mutex_lock(&ctl_mtx);
 	WRITE(dss, const char *);
 	match = false;
 	for (i = 0; i < dss_prec_limit; i++) {
@@ -1365,6 +1366,7 @@ arena_i_dss_ctl(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp,
 
 	ret = 0;
 label_return:
+	malloc_mutex_unlock(&ctl_mtx);
 	return (ret);
 }