3 command sequence to crash SunOs 4.0

[Bill Smith]

>% echo $$
><number>
>% suntools
>(with in a suntools window) % kill -9 <number>
>
>It may take 2 iterations of this sequence for the machine to crash.

I've divined a little more information about this problem.   I've been
able to reproduce it on 3/60's and not 3/50's.

Also, here is the result when one 3/60 crashed.  (It appears to have the
same pc each time it crashes.)

Any ideas what is to blame?

Bill Smith
wsmith at cs.uiuc.edu
__________

20:41:23 vmunix: getty: 
20:41:23 vmunix: trap address 0x8, pid 9221, pc = f022658, sr = 2508, stkfmt b, context 7
20:41:23 vmunix: Bus Error Reg 80<INVALID>
20:41:23 vmunix: data fault address 0 faultc 0 faultb 0 dfault 1 rw 1 size 3 fcode 5
20:41:23 vmunix: KERNEL MODE
20:41:23 vmunix: page map 0 pmgrp 71
20:41:23 vmunix: D0-D7  ffff2518 24 3 0 0 0 0 ffff2518
20:41:23 vmunix: A0-A7  f096ce0 1fff8000 0 ffff976c ffffffff ffffffdc ffff9674 ffff9664
20:41:23 vmunix: Begin traceback...fp = ffff9674, sp = ffff9664
20:41:23 vmunix: Called from f024052, fp=ffff96a0, args=ffffffdc 1 ffff976c f145f7c
20:41:23 vmunix: Called from f04d4c2, fp=ffff96b0, args=f17dd84 ffff976c ffff96fc f041086
20:41:23 vmunix: Called from f041086, fp=ffff96fc, args=0 ffff976c 0 0
20:41:23 vmunix: Called from f037a14, fp=ffff9728, args=f145f80 ffff976c 0 0
20:41:23 vmunix: Called from f02a040, fp=ffff9750, args=f0a5a30 0 ffff976c effffd0
20:41:23 vmunix: Called from f029e38, fp=ffff9780, args=ffff976c 0 ffff97b4 effff97
20:41:23 vmunix: Called from f058804, fp=ffff97a8, args=ffff9a18 effffe0 21b80 0
20:41:23 vmunix: Called from f004768, fp=effff98, args=3 0 7f 3 
20:41:23 vmunix: End traceback...
20:41:23 vmunix: panic: Bus error
20:41:23 vmunix: syncing file systems... done
20:41:23 vmunix: 
20:41:23 vmunix: dumping to vp f13e448, offset 16416
20:41:23 vmunix: 1022 total pages, dump succeeded
20:41:23 vmunix: rebooting...
20:41:23 vmunix: SunOS Release 4.0 (SRG.3_60) #3: Fri Dec 16 13:07:36 CST 1988
20:41:23 vmunix: Copyright (c) 1988 by Sun Microsystems, Inc.