Index: head/sys/dev/iscsi/icl.c
===================================================================
--- head/sys/dev/iscsi/icl.c
+++ head/sys/dev/iscsi/icl.c
@@ -75,7 +75,8 @@
 static MALLOC_DEFINE(M_ICL, "icl", "iSCSI Common Layer");
 static struct icl_softc	*sc;
 
-SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD, 0, "iSCSI Common Layer");
+SYSCTL_NODE(_kern, OID_AUTO, icl, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
+    "iSCSI Common Layer");
 int icl_debug = 1;
 SYSCTL_INT(_kern_icl, OID_AUTO, debug, CTLFLAG_RWTUN,
     &icl_debug, 0, "Enable debug messages");
Index: head/sys/dev/iscsi/iscsi.c
===================================================================
--- head/sys/dev/iscsi/iscsi.c
+++ head/sys/dev/iscsi/iscsi.c
@@ -82,7 +82,8 @@
  */
 static struct iscsi_softc	*sc;
 
-SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD, 0, "iSCSI initiator");
+SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
+    "iSCSI initiator");
 static int debug = 1;
 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RWTUN,
     &debug, 0, "Enable debug messages");
Index: head/sys/fs/autofs/autofs.c
===================================================================
--- head/sys/fs/autofs/autofs.c
+++ head/sys/fs/autofs/autofs.c
@@ -119,7 +119,8 @@
 
 struct autofs_softc	*autofs_softc;
 
-SYSCTL_NODE(_vfs, OID_AUTO, autofs, CTLFLAG_RD, 0, "Automounter filesystem");
+SYSCTL_NODE(_vfs, OID_AUTO, autofs, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
+    "Automounter filesystem");
 int autofs_debug = 1;
 TUNABLE_INT("vfs.autofs.debug", &autofs_debug);
 SYSCTL_INT(_vfs_autofs, OID_AUTO, debug, CTLFLAG_RWTUN,
Index: head/sys/kern/kern_rctl.c
===================================================================
--- head/sys/kern/kern_rctl.c
+++ head/sys/kern/kern_rctl.c
@@ -96,7 +96,8 @@
 static int rctl_throttle_pct_sysctl(SYSCTL_HANDLER_ARGS);
 static int rctl_throttle_pct2_sysctl(SYSCTL_HANDLER_ARGS);
 
-SYSCTL_NODE(_kern_racct, OID_AUTO, rctl, CTLFLAG_RW, 0, "Resource Limits");
+SYSCTL_NODE(_kern_racct, OID_AUTO, rctl, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+    "Resource Limits");
 SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, maxbufsize, CTLFLAG_RWTUN,
     &rctl_maxbufsize, 0, "Maximum output buffer size");
 SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, log_rate_limit, CTLFLAG_RW,
@@ -104,19 +105,23 @@
 SYSCTL_UINT(_kern_racct_rctl, OID_AUTO, devctl_rate_limit, CTLFLAG_RWTUN,
     &rctl_devctl_rate_limit, 0, "Maximum number of devctl messages per second");
 SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_min,
-    CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_min_sysctl, "IU",
+    CTLTYPE_UINT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, 0, 0,
+    &rctl_throttle_min_sysctl, "IU",
     "Shortest throttling duration, in hz");
 TUNABLE_INT("kern.racct.rctl.throttle_min", &rctl_throttle_min);
 SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_max,
-    CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_max_sysctl, "IU",
+    CTLTYPE_UINT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, 0, 0,
+    &rctl_throttle_max_sysctl, "IU",
     "Longest throttling duration, in hz");
 TUNABLE_INT("kern.racct.rctl.throttle_max", &rctl_throttle_max);
 SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_pct,
-    CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_pct_sysctl, "IU",
+    CTLTYPE_UINT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, 0, 0,
+    &rctl_throttle_pct_sysctl, "IU",
     "Throttling penalty for process consumption, in percent");
 TUNABLE_INT("kern.racct.rctl.throttle_pct", &rctl_throttle_pct);
 SYSCTL_PROC(_kern_racct_rctl, OID_AUTO, throttle_pct2,
-    CTLTYPE_UINT | CTLFLAG_RWTUN, 0, 0, &rctl_throttle_pct2_sysctl, "IU",
+    CTLTYPE_UINT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, 0, 0,
+    &rctl_throttle_pct2_sysctl, "IU",
     "Throttling penalty for container consumption, in percent");
 TUNABLE_INT("kern.racct.rctl.throttle_pct2", &rctl_throttle_pct2);