*BSD News Article 21224


Return to BSD News archive

Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!howland.reston.ans.net!sol.ctr.columbia.edu!news.kei.com!bloom-beacon.mit.edu!senator-bedfellow.mit.edu!marie.mit.edu!dejan
From: dejan@marie.mit.edu (Dejan Vucinic)
Newsgroups: comp.os.386bsd.bugs
Subject: SLIP hangs, shutdown fails
Followup-To: comp.os.386bsd.bugs
Date: 20 Sep 1993 23:07:04 GMT
Organization: MIT LNS
Lines: 36
Sender: dejan@marie.mit.edu
Distribution: world
Message-ID: <27ld2o$4t@senator-bedfellow.MIT.EDU>
NNTP-Posting-Host: marie.mit.edu
Keywords: SLIP serial

Hello,

I am having a hard time getting SLIP to work. I tip to my server, start
SLIP, quit (OR suspend) tip, slattach /dev/com0, ifconfig sl0 inet client
server, route add default server, and I'm all set. Right?

Well, not exactly. I am able to ping things, telnet and ftp. However,
first large chunk of text on screen hangs the connection completely.
One out of about ten times it happened as early as login screen, more 
often it happens within the first five or so ls/dir commands. When the
connection hangs packets obviously stop flowing, ping doesn't work
anymore. After the hang, last process that keeps the /dev/com0 open 
(usually slattach, but if I don't exit from tip it's tip) can't be killed:
ps reports that it is idle (STAT I), and after kill -whatever it is
idle and trying to exit (STAT IE). This doesn't change if I ifconfig 
sl0 down or ifconfig sl0 delete before or after the kill. So, when I
shutdown -h now to get rid of the maverick process, shutdown just hangs
after printing the broadcast message, before killing any other process.
After reboot I have a bloody hell on my disk, nothing gets cleaned up
before dying.

All this doesn't change with line speed, I tried speeds from 2400bps
to 38400bps. Exactly one time I did get silo overflow, but don't 
remember when. If I tip to a hung com0 I get "write: operation not 
supported by device" as a response to every typed character.

Any suggestions?

Equipment: 486DX33; 8Mb RAM; combo card full of attributes, I think it's
16550, if it may be important I'll open the box to check, it has two
serial lines, printer + game + IDE + floppy; US Robotics 14400 sportster;
mouse is on the other serial line, X doesn't change the behaviour.

Thanks,
Dejan