NMI Parity Errors while Parallel Printing

[Michael "Ford" Ditto]

In article <1409 at mtunb.ATT.COM> jcm at mtunb.UUCP (was-John McMillan) writes:
>PLEASE,
>	WHEN REPORTING ANY PROBLEMS:
>
>		***** IDENTIFY YOUR SOFTWARE VERSION *****
>
>For those of us with several source trees -- about 6, in my case --
>it provides SOME focus to the issue.

For some reason, the thought did not occur to me at the time that
anyone on the net might be interested in investigating the problem
... silly me!  (Also, I was still suspecting a hardware problem.)

In fact, John McMillan's posting inspired me to attempt to reproduce
the problem.  I went out and bought an appropriate printer cable,
since I don't have the one I was using before, and hooked up the
printer.  I pressed Shift-Print (which was the sure-fire way to
cause a panic in my earlier attempts) and out came a perfect screen
dump.  I printed several pages of listings just fine also.

Hmm.  I'm pretty sure that the cable is the same; I know that the
printer and computer are the same.  Perhaps some software changed.
I don't remember for sure whether I was running the 3.51 kernel or
the "3.51.1" kernel AT&T sent me when I reported the tty000-break
bug.  The latter is what I am running now.

>Also:	If you are getting recurring information in the register
>dumps, these registers -- in conjunction with the SOFTWARE VERSION --
>may pinpoint the problem.

Well, the good news is that I have the panic message and register dump
saved in a file.  The bad news is that I have about 10 of these panic
records, and I very stupidly did not keep track of which message
corresponded to what event.  Oh Well.

I'll try to make it crash again later, and if I succeed, I promise to
mail the panic message and a complete kernel core dump to anyone who
wants it!  Did I ever post my kernel core dump driver?
-- 
					-=] Ford [=-

"The number of Unix installations	(In Real Life:  Mike Ditto)
has grown to 10, with more expected."	ford at kenobi.cts.com
- The Unix Programmer's Manual,		...!sdcsvax!crash!kenobi!ford
  2nd Edition, June, 1972.		ditto at cbmvax.commodore.com