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From: Arien Vijn <arien.vijn@ams-ix.net>
Date: Sat, 29 Nov 2003 14:42:15 +0100
To: freebsd-questions@FreeBSD.ORG
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cc: Arien Vijn <arien.vijn@ams-ix.net>
Subject: Serial console stops working at password prompt
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Greetings,

I do have an issue with FreeBSD 5.1-RELEASE (i386) and a serial 
console. I can see the boot messages, console messages and a login 
prompt. I can type a username, after that it shows the password prompt 
and at that point things stop working as expected.

After a while 'ps' shows that the login is the front-process (1059 in 
the output below) for ttyd0 but it becomes idle regardless any console 
input:

# ps -ef | grep login
   483  v0  Is     0:00.02  login [pam] (login)
  1059  d0  I<s+   0:00.01  login

When I kill the login process the 'getty process' is started as 
front-process for ttyd0:

# ps -ef | grep ttyd0
  1085  d0  Ss+    0:00.00  /usr/libexec/getty std.9600 ttyd0

Again the login prompt appears in the terminal connected to the serial 
console.

ps also shows that the login process raised CPU scheduling priority 
('<'). Tests show that this process does that when waiting for a 
password in a VGA-console. So I guess the login process is waiting for 
a password but somehow it does not receive anything from the serial 
port. Hense it becomes idle.

However, console messages (like: "login: Nov 29 21:37:46 cyclone login: 
ROOT LOGIN (root) ON ttyv1") are redirected fine to the serial console.

Does anyone have an idea what might go wrong here?

Thanks in advance, Arien