By popular demand, here is the the patch to kern_proc.c.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>

Index: kern_proc.c
===================================================================
RCS file: /cvsroot/syssrc/sys/kern/kern_proc.c,v
retrieving revision 1.36
retrieving revision 1.38
diff -c -r1.36 -r1.38
*** kern_proc.c	2000/01/13 21:55:36	1.36
--- kern_proc.c	2000/01/22 16:53:50	1.38
***************
*** 1,4 ****
! /*	$NetBSD: kern_proc.c,v 1.36 2000/01/13 21:55:36 thorpej Exp $	*/
  
  /*-
   * Copyright (c) 1999 The NetBSD Foundation, Inc.
--- 1,4 ----
! /*	$NetBSD: kern_proc.c,v 1.38 2000/01/22 16:53:50 thorpej Exp $	*/
  
  /*-
   * Copyright (c) 1999 The NetBSD Foundation, Inc.
***************
*** 119,126 ****
   *
   * We have two types of locks on the proclists: read locks and write
   * locks.  Read locks can be used in interrupt context, so while we
!  * hold the write lock, we must also block softclock interrupts (since
!  * the interrupt context is the timeout-driven schedcpu()).
   *
   * The proclist lock locks the following structures:
   *
--- 119,127 ----
   *
   * We have two types of locks on the proclists: read locks and write
   * locks.  Read locks can be used in interrupt context, so while we
!  * hold the write lock, we must also block clock interrupts to
!  * lock out any scheduling changes that may happen in interrupt
!  * context.
   *
   * The proclist lock locks the following structures:
   *
***************
*** 202,208 ****
  {
  	int error, s;
  
! 	s = splsoftclock();
  	error = spinlockmgr(&proclist_lock, LK_SHARED, NULL);
  #ifdef DIAGNOSTIC
  	if (error)
--- 203,209 ----
  {
  	int error, s;
  
! 	s = splclock();
  	error = spinlockmgr(&proclist_lock, LK_SHARED, NULL);
  #ifdef DIAGNOSTIC
  	if (error)
***************
*** 219,225 ****
  {
  	int s;
  
! 	s = splsoftclock();
  	(void) spinlockmgr(&proclist_lock, LK_RELEASE, NULL);
  	splx(s);
  }
--- 220,226 ----
  {
  	int s;
  
! 	s = splclock();
  	(void) spinlockmgr(&proclist_lock, LK_RELEASE, NULL);
  	splx(s);
  }
***************
*** 232,238 ****
  {
  	int error, s;
  
! 	s = splsoftclock();
  	error = spinlockmgr(&proclist_lock, LK_EXCLUSIVE, NULL);
  #ifdef DIAGNOSTIC
  	if (error != 0)
--- 233,239 ----
  {
  	int error, s;
  
! 	s = splclock();
  	error = spinlockmgr(&proclist_lock, LK_EXCLUSIVE, NULL);
  #ifdef DIAGNOSTIC
  	if (error != 0)