Path: utzoo!utgpu!water!watmath!clyde!rutgers!sdcsvax!ucsdhub!jack!sdeggo!dave
From: dave@sdeggo.UUCP (David L. Smith)
Newsgroups: comp.unix.questions
Subject: Re: Unix (Microport) internal question
Keywords: Unix Microport internals
Message-ID: <169@sdeggo.UUCP>
Date: 12 Jan 88 01:57:58 GMT
References: <2788@killer.UUCP>
Organization: Lazy Programmer's Society of San Diego
Lines: 26


 In article <2788@killer.UUCP>, ajohnson@killer.UUCP (Andy Johnson) writes:
 > I have been running Microport's Unix V2.2 for about 7 months now
 > and have encountered the messages:
 >             tss fault
 >             double panic tss fault
 > 
 > I have contacted Microport on more than one occasion and asked them
 > about this.  Their answer was, it shouldn't happen, but they never
 > could/would tell me what it is.  I would appreciate it if any netlanders 
 > that are sufficiently versed in unix internals and know the answer to this 
 > question would reply, either in mail or on the net.

	This is the infamous serial port bug.  Apparently they are not masking
out their interrupts properly and there is some kind of a race condition that
gets set up.  This is a known and acknowledged bug.  They thought they had
fixed it in 2.3, but apparently there is still a chance that this might
come up.  It seems to be caused by running the serial ports at speeds above
2400 baud.


-- 
David L. Smith
{sdcsvax!jack,ihnp4!jack, hp-sdd!crash, pyramid}!sdeggo!dave
sdeggo!dave@amos.ling.edu 
Sinners can repent, but stupid is forever.