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From: cetron%utah-ced@UTAH-CS.ARPA (Ed Cetron)
Newsgroups: mod.computers.vax
Subject: hung (sort of) processes
Message-ID: <8611052218.AA13952@utah-ced.ARPA>
Date: Wed, 5-Nov-86 17:18:29 EST
Article-I.D.: utah-ced.8611052218.AA13952
Posted: Wed Nov  5 17:18:29 1986
Date-Received: Fri, 7-Nov-86 09:03:48 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 39
Approved: info-vax@sri-kl.arpa


	I have got some very strange happenings on my microvax:

	

	I have several processess which do a lot of math as well as
a fair bit of graphics using the UIS$xxxx calls for my gpx...

	Every so often, these processes just hang - no ctrl-y, no
ctrl-t, nothing..... I can use sho proc/cont/id=... to observe these
and they ARE using up cpu time, but no i/o or page faults.

	All of the programs are written in straight forward fortran,
no AST or sys calls, (except calls to UIS$ccccc).  But they all hang
at the same place in the program (but at random times through the loop)
and all show a pc of 8008E204  which is obviously in some shareable
library since the map of the main offending program has no addresses
this high.  

	I tried to use the debugger once and when the process hung, I
could never get control to the debugger either.....

	I am totally stumped (too bad its not on RSX 'cause then I 
could zap the image and get a postmortem dump at least....)....

	I can't even stop these processes with stop/id=xxx since 
then neither sho proc/id= or sho users can find them, but sho sys
and monitor still can and they continue to run (eating CPU time).
My only solution is to reboot!!!!!

	If any one has ANY ideas, I would be ecstatic - if you 
want map's or the like, no problem....


	thanks in advance,

		ed cetron
		center for engineering design
		univ of utah