Path: utzoo!utgpu!watmath!clyde!bellcore!rutgers!iuvax!jec
From: jec@iuvax.cs.indiana.edu (James E. Conley)
Newsgroups: comp.sys.apollo
Subject: crashing a DSP90 running tcpd
Keywords: wbak ethernet crash dsp90
Message-ID: <15676@iuvax.cs.indiana.edu>
Date: 9 Dec 88 04:59:22 GMT
Organization: Indiana University, Bloomington, IN
Lines: 30

/* Written  3:34 am  Nov 18, 1988 by sahayman@iuvax in iuvax:cs.works.apollo */
/* ---------- "How to make Achilles crash." ---------- */
After a number of experiments and a lot of standing around
waiting for the machine to reboot, it appears that Achilles will
always crash if...

a) /etc/tcpd is running
b) Both interfaces are configured  (don't just restart tcpd,
   you have to re-ifconfig the interfaces too.)
c) You do a wbak (the utility that writes backup tapes) which includes
   //achilles/sys/drivers/ecmb.   A simple
   wbak -f 1 -owner root -full //achilles/sys/drivers/ecmb
   is sufficient.

Sometimes achilles will crash when backing up this directory,
sometimes tcpd will merely segmentation fault.    I'm not
sure which file in the directory is causing the problem.
I'm losing patience ...

This suggests to me that perhaps something in the driver is depending
on some file in /sys/drivers/ecmb being left alone; wbak comes
traipsing along, backs up one of the files and tcpd says
hey, what's going on, somebody else is reading one of my files,
I better cause the machine to crash.

This has probably got something to do with why the machine
always crashes when doing a full backup.  Eventually
it gets around to /sys/drivers/ecmb, and blammo, down
goes the machine.
/* End of text from iuvax:cs.works.apollo */