diff --git a/sys/kern/kern_thr.c b/sys/kern/kern_thr.c
--- a/sys/kern/kern_thr.c
+++ b/sys/kern/kern_thr.c
@@ -231,8 +231,6 @@
 	if (error)
 		goto fail;
 
-	cpu_copy_thread(newtd, td);
-
 	bzero(&newtd->td_startzero,
 	    __rangeof(struct thread, td_startzero, td_endzero));
 	bcopy(&td->td_startcopy, &newtd->td_startcopy,
@@ -241,6 +239,8 @@
 	newtd->td_rb_list = newtd->td_rbp_list = newtd->td_rb_inact = 0;
 	thread_cow_get(newtd, td);
 
+	cpu_copy_thread(newtd, td);
+
 	error = initialize_thread(newtd, thunk);
 	if (error != 0) {
 		thread_cow_free(newtd);