take down the entire xterm (or GNU screen tab), hard, with:

mksh-R40 -c 'x=$COLUMNS; awk "BEGIN{exit(1)}"'
10x to the PLD Linux guys for spotting _and_ bisecting this!

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.472 2011/07/06 22:21:54 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.473 2011/07/07 20:24:50 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -25,7 +25,7 @@
 # http://www.research.att.com/~gsf/public/ifs.sh
 
 expected-stdout:
-	@(#)MIRBSD KSH R40 2011/07/06
+	@(#)MIRBSD KSH R40 2011/07/07
 description:
 	Check version of shell.
 stdin:

sh.h

@@ -151,9 +151,9 @@
 #endif
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.483 2011/07/06 22:22:00 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.484 2011/07/07 20:24:52 tg Exp $");
 #endif
-#define MKSH_VERSION "R40 2011/07/06"
+#define MKSH_VERSION "R40 2011/07/07"
 
 #ifndef MKSH_INCLUDES_ONLY
 

var.c

@@ -26,7 +26,7 @@
 #include <sys/sysctl.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/var.c,v 1.129 2011/07/06 22:22:02 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/var.c,v 1.130 2011/07/07 20:24:53 tg Exp $");
 
 /*-
  * Variables
@@ -1461,7 +1461,7 @@ change_winsz(void)
 #ifdef TIOCGWINSZ
 		if (tty_fd < 0)
 			/* non-FTALKING, try to get an fd anyway */
-			tty_init(false, false);
+			tty_init(true, false);
 #endif
 		x_cols = -1;
 	}