Index: halt.sh
===================================================================
--- halt.sh	(revision 2421)
+++ halt.sh	(working copy)
@@ -106,6 +106,11 @@
 		continue
 	fi
 
+	# If we're using the mount (probably /usr) then don't unmount us
+	if [[ " $(fuser -m "${x}" 2>/dev/null) " == *" $$ "* ]] ; then
+		continue
+	fi
+
 	if ! umount "${x}" &>/dev/null; then
 		# Kill processes still using this mount
 		/bin/fuser -s -k -9 -m "${x}"