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Path: utzoo!watmath!clyde!burl!ulysses!cbosgd!ucbvax!info-vax
From: info-vax@ucbvax.ARPA
Newsgroups: fa.info-vax
Subject: Machine checks...
Message-ID: <2806@ucbvax.ARPA>
Date: Wed, 24-Oct-84 22:16:44 EDT
Article-I.D.: ucbvax.2806
Posted: Wed Oct 24 22:16:44 1984
Date-Received: Fri, 26-Oct-84 02:41:34 EDT
Sender: daemon@ucbvax.ARPA
Organization: University of California at Berkeley
Lines: 27

From: engvax!KVC@cit-vax

Well, thanks to the recent discussion on INFO-VAX, I just got
a machine check...  Well, at least it couldn't have happened
at a better time!  Here I am all ready to apply my new-found
expertise!

Enough of that...

Anyway, I picked the error out of the interrupt stack, and found
I got a "Read Data Substitute" error.  I got this same error
listed in the error log just before the crash got logged.   The
sequence in the error log was:

	memory error:   RDS
	machine check in exec mode:  RDS  (system didn't crash)
	machine check in kernel mode: RDS (down she went...)

The timestamps on the above three errors indicate they happened
closer together than the resolution of system time (.01 secs).

Anyway, does anyone out there know what a "Read Data Substitute"
error is?  I understand all about machine checks now, but what's
the error mean!?

	/Kevin Carosso              engvax!kvc @ CIT-VAX.ARPA
	 Hughes Aircraft Co.