Index: sys/dev/cons.c
===================================================================
RCS file: /cvsroot/src/sys/dev/cons.c,v
retrieving revision 1.69
diff -u -p -u -r1.69 cons.c
--- sys/dev/cons.c	13 Mar 2012 18:40:29 -0000	1.69
+++ sys/dev/cons.c	22 Dec 2013 16:34:06 -0000
@@ -247,7 +247,9 @@ cngetsn(char *cp, int size)
 {
 	char *lp;
 	int c, len;
+	int s;
 
+	s = splhigh();
 	cnpollc(1);
 
 	lp = cp;
@@ -260,6 +262,7 @@ cngetsn(char *cp, int size)
 			printf("\n");
 			*lp++ = '\0';
 			cnpollc(0);
+			splx(s);
 			return (len);
 		case '\b':
 		case '\177':