diff -NurpP --minimal linux-3.6.10-vs2.3.4.4/fs/proc_namespace.c linux-3.6.10-vs2.3.4.5/fs/proc_namespace.c
--- linux-3.6.10-vs2.3.4.4/fs/proc_namespace.c	2012-10-04 18:47:00.000000000 +0200
+++ linux-3.6.10-vs2.3.4.5/fs/proc_namespace.c	2012-12-10 18:17:40.000000000 +0100
@@ -82,6 +82,8 @@ static inline void mangle(struct seq_fil
 	seq_escape(m, s, " \t\n\\");
 }
 
+#ifdef	CONFIG_VSERVER_EXTRA_MNT_CHECK
+
 static int mnt_is_reachable(struct vfsmount *vfsmnt)
 {
 	struct path root;
@@ -110,6 +112,10 @@ static int mnt_is_reachable(struct vfsmo
 	return ret;
 }
 
+#else
+#define	mnt_is_reachable(v)	(1)
+#endif
+
 static void show_type(struct seq_file *m, struct super_block *sb)
 {
 	mangle(m, sb->s_type->name);
diff -NurpP --minimal linux-3.6.10-vs2.3.4.4/kernel/vserver/Kconfig linux-3.6.10-vs2.3.4.5/kernel/vserver/Kconfig
--- linux-3.6.10-vs2.3.4.4/kernel/vserver/Kconfig	2012-10-04 18:47:00.000000000 +0200
+++ linux-3.6.10-vs2.3.4.5/kernel/vserver/Kconfig	2012-12-10 18:21:15.000000000 +0100
@@ -176,6 +176,15 @@ config	VSERVER_HISTORY_SIZE
 	  This allows you to specify the number of entries in
 	  the per-CPU history buffer.
 
+config	VSERVER_EXTRA_MNT_CHECK
+	bool	"Extra Checks for Reachability"
+	default n
+	help
+	  Set this to yes if you want to do extra checks for
+	  vfsmount reachability in the proc filesystem code.
+	  This shouldn't be required on any setup utilizing
+	  mnt namespaces.
+
 choice
 	prompt	"Quotes used in debug and warn messages"
 	default	QUOTES_ISO8859