commit e4195c01c3e5157c369c80c59a70ef4640463213
Author: Ryota Ozaki <ozaki-r@iij.ad.jp>
Date:   Thu Feb 8 12:03:50 2018 +0900

    Fix race condition on LP_BOUND

diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c
index 93aab1558a0..9fe0f735b20 100644
--- a/sys/kern/kern_synch.c
+++ b/sys/kern/kern_synch.c
@@ -589,7 +589,8 @@ mi_switch(lwp_t *l)
 			 * be reset here, if interrupt/preemption happens
 			 * early in idle LWP.
 			 */
-			if (l->l_target_cpu != NULL) {
+			if (l->l_target_cpu != NULL &&
+			    (l->l_pflag & LP_BOUND) == 0) {
 				KASSERT((l->l_pflag & LP_INTR) == 0);
 				spc->spc_migrating = l;
 			}