Subject: Re: Wedging a system via remote high-bandwidth X programs
To: None <port-sparc@netbsd.org>
From: Greg Earle <earle@isolar.Tujunga.CA.US>
List: port-sparc
Date: 12/06/1994 04:11:10
Chris Torek wrote:
> We have seen X11R5 wedge under both SunOS and BSD; this sounds like something
> identical. If you kill the server, everything is OK, so it seems like a bug
> in the server - except that when we traced this under SunOS, it appeared to
> be a kernel bug (but then why did it persist under BSD?).
No - this is far nastier. It happened again tonight (I was testing LBX, the
Low-Bandwidth X extension).
The machine dies. At first I thought it was just wedged. Then I got a bright
idea (for once (-: ). I thought, "Gee, last time I did a blind `L1-A' and a
`reset', and it came back". Now I wondered if maybe I was already at the
PROM, and didn't realize it (screen goes black, remember). So I (blindly)
typed (just) "boot", and voila, lo and behold my screen came back on (thank
GOODNESS these old PROMs don't do an automatic "reset" on "boot") and I found
something rather grisly still on-screen:
Watchdog reset
Instruction Access Exception
ok
Holy double bus errors, Batman!
I can see it now "R6 Xsun server - first `killer' app for NetBSD/SPARC ...
Film at eleven" ... (-:
Being on cranial auto-pilot, I then typed
ok sync
and was reminded "This ain't SunOS, bucko":
No callback routine has been installed
ok
As I said the first time:
> P.S. Can one boot a 1.0 system under DDB? If so, what is required to do so?
> (ddb(4) isn't terribly forthcoming on the subject)
- Greg