Fixes a race condition that can be triggered when multiple threads
enter the function ldap_int_utils_init about the same time.
Patch was developed in-house; it is Solaris specific and
will not be contributed upstream.

--- openldap-2.4.44/libraries/libldap/util-int.c.old	2016-06-28 12:13:02.410770969 -0700
+++ openldap-2.4.44/libraries/libldap/util-int.c	2016-06-28 12:13:07.923164035 -0700
@@ -92,6 +92,10 @@
 	/* Don't know how to handle this version, pretend it's not there */
 #	undef HAVE_GETHOSTBYADDR_R
 # endif
+
+/* use static mutex to protect mutex initialization */
+static ldap_pvt_thread_mutex_t ldap_int_utils_init_mutex = PTHREAD_MUTEX_INITIALIZER;
+
 #endif /* LDAP_R_COMPILE */
 
 char *ldap_pvt_ctime( const time_t *tp, char *buf )
@@ -700,9 +704,17 @@
 	static int done=0;
 	if (done)
 	  return;
+#ifndef LDAP_R_COMPILE
	done=1;
+#endif
 
 #ifdef LDAP_R_COMPILE
+	/* use static mutex to protect mutex initialization */
+	(void) LDAP_MUTEX_LOCK(&ldap_int_utils_init_mutex);
+	if (done) {
+		(void) LDAP_MUTEX_UNLOCK(&ldap_int_utils_init_mutex);
+		return;
+	}
 #if !defined( USE_CTIME_R ) && !defined( HAVE_REENTRANT_FUNCTIONS )
 	ldap_pvt_thread_mutex_init( &ldap_int_ctime_mutex );
 #endif
@@ -718,9 +727,13 @@
 #ifdef HAVE_GSSAPI
 	ldap_pvt_thread_mutex_init( &ldap_int_gssapi_mutex );
 #endif
+ 
+	done=1;
+	/* use static mutex to protect mutex initialization */
+	(void) LDAP_MUTEX_UNLOCK(&ldap_int_utils_init_mutex);
 #endif
 
 	/* call other module init functions here... */
 }
 
 #if defined( NEED_COPY_HOSTENT )