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Date:      Tue, 15 Dec 1998 11:32:14 +1030
From:      Greg Lehey <grog@lemis.com>
To:        "Marc G. Fournier" <marc.fournier@acadiau.ca>, Karl Pielorz <kpielorz@tdx.co.uk>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: System "crashed", serial console giving garbage...
Message-ID:  <19981215113214.T17075@freebie.lemis.com>
In-Reply-To: <Pine.BSF.4.05.9812141236040.18505-100000@atelier.acadiau.ca>; from Marc G. Fournier on Mon, Dec 14, 1998 at 12:37:43PM -0400
References:  <36753622.3B46F4E2@tdx.co.uk> <Pine.BSF.4.05.9812141236040.18505-100000@atelier.acadiau.ca>

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On Monday, 14 December 1998 at 12:37:43 -0400, Marc G. Fournier wrote:
> On Mon, 14 Dec 1998, Karl Pielorz wrote:
>> The Hermit Hacker wrote:
>>>         About 15min oago or so, my system stop'd working :(  If I connect
>>> through the serial console, I see the following, after hitting return:
>>>
>>> pagecorp> attach s0
>>> Trying 209.47.145.10 ...
>>> Connected - Escape character is '^]'.
>>> $T0508:91e81ff0;05:c4cf3bfa;04:a0cf3bfa;#ef$T0508:91e81ff0;05:c4cf3bfa;04:a0cf3bfa;#ef$T0508:91e81ff0;05:c4cf3bfa;04:a0cf3bfa;#ef$T0508:91e81ff0;05:c4cf3bfa;04:a0cf3bfa;#ef$T0508:91e81ff0;05:c4cf3bfa;04:a0cf3bfa;#ef$T0508:91e81ff0;05:c4cf3bfa;04:a0cf3bfa;#ef
>>>
>>> Now, I could understand it crashing and just freezing, but issuign
>>> garbage?
>>>
>>> I have nothing else to debug with at this point, and have to wait for
>>> someone to head downtown to reboot the machine, but figured I'd try to
>>> start *somewhere* :(
>>
>> I've seen similar to this before... Make sure your not trying to run remote
>> GDB across the serial console? (without it's counterpart on the other end)...
>
> 	Altho I think this would be highly unlikely, given the method of
> connecting the serial console I'm using...how would I check this, just in
> case?

I think Karl's probably right.  This looks *very* like the kernel
debugger trying to talk gdb across the serial line.  The obvious thing
to do is to see if a gdb understands it:

 # gdb -k
 (gdb) set remotebaud 9600	  (or whatever)
 (gdb) target remote /dev/cuaa0   (or whatever)

Greg
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