Index: subr_bus.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/subr_bus.c,v
retrieving revision 1.156.2.5.2.1
diff -u -r1.156.2.5.2.1 subr_bus.c
--- subr_bus.c	6 May 2005 02:51:09 -0000	1.156.2.5.2.1
+++ subr_bus.c	18 May 2005 16:08:37 -0000
@@ -34,6 +34,7 @@
 #include <sys/conf.h>
 #include <sys/filio.h>
 #include <sys/lock.h>
+#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/kobj.h>
 #include <sys/malloc.h>
@@ -2433,7 +2434,15 @@
 {
 	struct resource_list_entry *rle;
 
+	if(rl == NULL) {
+		kdb_backtrace();
+		panic("resource_list_find: null rl");
+	}
 	SLIST_FOREACH(rle, rl, link) {
+		if (rle < 4096) {
+			kdb_backtrace();
+			panic("resource_list_find: bogus rle");
+		}
 		if (rle->type == type && rle->rid == rid)
 			return (rle);
 	}