From owner-freebsd-alpha@FreeBSD.ORG  Wed Sep 10 16:24:19 2008
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Date: Wed, 10 Sep 2008 16:24:17 GMT
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To: alexey@zhtw.org.ru, gavin@FreeBSD.org, freebsd-alpha@FreeBSD.org
From: gavin@FreeBSD.org
Cc: 
Subject: Re: alpha/127248: System crashes when many (7) serial port
	terminals (vt320-vt510) connected to the server via com to
	usb adapter and 2-usb hubs.
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Synopsis: System crashes when many (7) serial port terminals (vt320-vt510) connected to the server via com to usb adapter and 2-usb hubs.

State-Changed-From-To: open->feedback
State-Changed-By: gavin
State-Changed-When: Wed Sep 10 16:17:30 UTC 2008
State-Changed-Why: 
To submitter:  Are you able to compile the debugger into the kernel
and obtain a backtrace next time it panics?

Add the following to your kernel config file:
options KDB
options DDB
options GDB

Then when the machine crashes next, enter "bt" at the prompt?
(Disclaimer: I've never used FreeBSD/alpha before, but this should work)

By the way, my gut instinct is that this panic is caused by the fact the
serial dongles seem to be disconnecting/reconnecting, and not specifically
because the machine is an Alpha.  However, why they are disconnecting in
the first place, I don't know.

http://www.freebsd.org/cgi/query-pr.cgi?pr=127248