11/780 crash

[utzoo!decvax!harpo!floyd!cmcl2!philabs!jgc]

Subject: 11/780 crash

Has anyone had any experiences with the following
hardware fault on an 11/780.

We run 4.1bsd on an 11/780 with 2 meg,
2 RP06's, 2 Able DH/DM's, 2 DEC DZ11's.

problem:

cpu halts console spews :

	?INT-STK INVALID
	HALTED AT 8000xxxx
		      \   \
		       -------- random address

Problems is independent of system load, occurs
only with UNIX.  DEC diagnostics find nothing.

Page 40 of VAX hardware manual mentions error under
"serious system failures."

jim constantine
philips labs