The original MS_COMMENT is in conflict with MS_UNBINDABLE.

--- util-linux-2.13-pre6/mount/mount.c.comment	2006-11-01 13:31:45.000000000 +0100
+++ util-linux-2.13-pre6/mount/mount.c	2006-11-01 13:31:38.000000000 +0100
@@ -106,7 +106,7 @@
 #define MS_OWNER	0x10000000
 #define MS_GROUP	0x08000000
 #define MS_PAMCONSOLE   0x04000000
-#define MS_COMMENT	0x00020000
+#define MS_COMMENT	0x02000000
 #define MS_LOOP		0x00010000