73 system problem?

[hpg]

I recently installed 2.9 on a new 11/73 system.  Relevant parts:
73 processor, 1M PEBX ECC memory, DILOG 228 disk controller with Fujitsu Eagle,
DILOG 132 tape coupler with Cipher 891, DLV11J SLU all in a BA11SA box.
After careful mods to the boot and kernel 2.9 runs like a champ ... except
	one in every three or four user processes dies just after birth with
	bus error, segmentation fault, IOT trap, or illegal instruction and
	the requisite core dump (bus error and seg fault most common).
	The frequency is load dependent.  I've substituted the
	processor and memory; no fix.  Others around me are
	not having the problem; they have Emulex controllers and Fujitsu 160's,
	though.  The kernel has NEVER crashed in one month of operation.

Has anyone seen this problem before?  All suggestions welcome.  My forehead
is becoming badly calloused.

Please respond to ...!ihnp4!wuibc!hpg who is:  Herschel Goldstein,
Washington University, Campus Box 8115, St. Louis, MO  63110.
(314) 362-1219