From owner-freebsd-current  Fri May 14 10:17:46 1999
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Date: Fri, 14 May 1999 13:17:32 -0400 (EDT)
From: Luoqi Chen <luoqi@watermarkgroup.com>
Message-Id: <199905141717.NAA06110@lor.watermarkgroup.com>
To: fullermd@futuresouth.com, sheldonh@uunet.co.za
Subject: Re:  Panic with screen w/info (was Re: Today's kernel crashes on starting X)
Cc: current@FreeBSD.ORG, gmarco@scotty.masternet.it
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

It seems that screen was trying to flush the master pty, before the slave
tty was even open. We were lucky that this didn't crash our machines before
the dev_t changes, it only caused the console to be flushed instead. But
after the dev_t changes, it is fatal. Try this fix (band-aid only, better
fix should involve checking of TS_OPEN bit),

Index: tty_pty.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/tty_pty.c,v
retrieving revision 1.57
diff -u -r1.57 tty_pty.c
--- tty_pty.c	1999/05/08 06:39:43	1.57
+++ tty_pty.c	1999/05/14 16:51:58
@@ -336,6 +336,7 @@
 	tp = &pt_tty[minor(dev)];
 	if (tp->t_oproc)
 		return (EIO);
+	tp->t_dev = dev;
 	tp->t_oproc = ptsstart;
 #ifdef sun4c
 	tp->t_stop = ptsstop;

-lq


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