--- src/gnu/usr.bin/gdb/kgdb/kthr.c	2006/03/07 15:48:11	1.1
+++ src/gnu/usr.bin/gdb/kgdb/kthr.c	2006/07/09 01:38:57	1.2
@@ -156,6 +156,15 @@ kgdb_thr_init(void)
 				 */
 				kt->pid = -2;
 				kt->paddr = 0;
+				/*
+				 * We are a kernel thread, so our td_pcb is
+				 * not used anyways.  An exception is the
+				 * dumping thread.
+				 * kt->pcb == NULL is a marker for
+				 * "non-dumping kernel thread".
+				 */
+				if (kt->tid != dumptid)
+					kt->pcb = NULL;
 			}
 			first = kt;
 			addr = (uintptr_t)TAILQ_NEXT(&td, td_allq);