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Date: Sun, 8 May 2005 16:14:45 -0700 (PDT)
From: Doug White <dwhite@gumbysoft.com>
To: =?ISO-8859-1?Q?Eirik_=D8verby?= <ltning@anduin.net>
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cc: current@freebsd.org
Subject: Re: Strange semi-hangs on 5.4
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On Sun, 8 May 2005, [ISO-8859-1] Eirik =D8verby wrote:

> Hi all,
>
> With relatively recent 5.4, I'm seeing hangs that worry me. The box
> (dual opteron) accepts keyboard input, but it won't actually DO
> anything.. SSHing in gives me a TCP session but no actualy password
> prompt. Trying to log in on (serial) console doesn't work, I just get
> a newline after entering the username, no password prompt. On SSH
> shells alredy open, I can't even get a new prompt line, all I get is
> newlines.

I've seen this if you have console redirection set to "always" on certain
BIOSes. Some apparently can stay alive after FreeBSD steals the serial
port and jumps into protected mode. Most notice loader fiddling with the
port registers and know to get out of the way.

Try turning it off or setting it to "Boot Loader" or turn off "CR
Redirection after POST".

> telnet> send brk

Cyclades?

> KDB: enter: Line break on console
> 3KtDhB:a s tpaicdk  1b1a0e00:0

Ah, interleaved output :-)

> aitd l e _ p r o c ( )   a t   i d l e _ p r o c + 0 x 1 1 3

The spaces here are what I'm guessing is the console redirection.

> m???b >   o|?|??f?tpie  rat0f :          n o p
>      dd
> db>
> db>
> db
> d
> d
> dd
> db>
> db
> dd
> db>
> db
> d
> db>
> dd
>
> ...and then it keeps spewing d's and db's and stuff at me at
> whichever speed my serial can handle. In other words, useless. All I
> can do at this point is log in to my power switch and powercycle the
> box.
>
> Anyone?
>
> /Eirik
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--=20
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org