[net.unix-wizards] what is 'jump to 0' is it trouble?

root@bradley.UUCP (10/16/84)

Hi,
I just had a werid crash. It crashed with the message

panic: jump to 0

Could anyone tell what this means? I found where it executes the
code (in l.s) but can't seem to understand how it would get there.

Mind you this is 2.9 on 11/44. Also should I worry about it?
Thanks inadvance

Brad Smith
bradley!brad

hoffman@pittvax.UUCP (10/22/84)

I had exactly the same problem on our 11/45 when fooling around
with 2.9.  I found that one of the interrupt vectors had not been
initialized and, when the device interrupted, it ended up calling
an interrupt service routine at location 0.  My first suggestion is
to check your l.s to make sure that all of your devices are configured.
My problem was with RP03s -- they're so old that it's no wonder that
Berkeley didn't have them configured properly.

You might also try putting a halt at instruction location 0 and
looking at the stack after it halts. It should show you where
you were before it bombed.

Good luck,
-- 
Bob Hoffman, N3CVL
Pitt Computer Science

alan@drivax.UUCP (10/31/84)

I think that this is due to a hardware problem. Something like
a device signaling an interrupt, but not supplying a vector. But
I am not a PDP-11 expert.
-- 
---------------------
Alan Fargusson.

{ ihnp4, sftig, amdahl, ucscc, ucbvax!unisoft }!drivax!alan