Index: netinet/in.c
===================================================================
--- netinet/in.c	(revision 194811)
+++ netinet/in.c	(working copy)
@@ -306,6 +306,42 @@
 		break;
 	}
 
+	switch (cmd) {
+	case SIOCAIFADDR:
+		printf("SIOCAIFADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCSIFADDR:
+		printf("SIOCSIFADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCSIFBRDADDR:
+		printf("SIOCSIFBRDADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCSIFNETMASK:
+		printf("SIOCSIFNETMASK %s\n", ifp->if_xname);
+		break;
+	case SIOCSIFDSTADDR:
+		printf("SIOCSIFDSTADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCDIFADDR:
+		printf("SIOCDIFADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCGIFADDR:
+		printf("SIOCGIFADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCGIFNETMASK:
+		printf("SIOCGIFNETMASK %s\n", ifp->if_xname);
+		break;
+	case SIOCGIFDSTADDR:
+		printf("SIOCGIFDSTADDR %s\n", ifp->if_xname);
+		break;
+	case SIOCGIFBRDADDR:
+		printf("SIOCGIFBRDADDR %s\n", ifp->if_xname);
+		break;
+	default:
+		printf("cmd %lu %s\n", cmd, ifp->if_xname);
+		break;
+	}
+
 	/*
 	 * Find address for this interface, if it exists.
 	 *
Index: net/if.c
===================================================================
--- net/if.c	(revision 194821)
+++ net/if.c	(working copy)
@@ -48,13 +48,13 @@
 #include <sys/socket.h>
 #include <sys/socketvar.h>
 #include <sys/protosw.h>
-#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/lock.h>
 #include <sys/refcount.h>
 #include <sys/module.h>
 #include <sys/rwlock.h>
 #include <sys/sockio.h>
+#include <sys/stack.h>
 #include <sys/syslog.h>
 #include <sys/sysctl.h>
 #include <sys/taskqueue.h>
@@ -1424,25 +1424,48 @@
 void
 ifa_init(struct ifaddr *ifa)
 {
+	struct stack st;
 
 	mtx_init(&ifa->ifa_mtx, "ifaddr", NULL, MTX_DEF);
 	refcount_init(&ifa->ifa_refcnt, 1);
+
+	stack_zero(&st);
+	stack_save(&st);
+	printf("ifa_init %p\n", ifa);
+	stack_print_short_ddb(&st);
 }
 
 void
 ifa_ref(struct ifaddr *ifa)
 {
+	struct stack st;
 
 	refcount_acquire(&ifa->ifa_refcnt);
+
+	stack_zero(&st);
+	stack_save(&st);
+	printf("ifa_ref %p (now %u)\n", ifa, ifa->ifa_refcnt);
+	stack_print_short_ddb(&st);
 }
 
 void
 ifa_free(struct ifaddr *ifa)
 {
+	struct stack st;
 
+	stack_zero(&st);
+	stack_save(&st);
 	if (refcount_release(&ifa->ifa_refcnt)) {
+		printf("ifa_free %p (now %u, will free)\n", ifa,
+		    ifa->ifa_refcnt);
+		stack_print_short_ddb(&st);
+		
 		mtx_destroy(&ifa->ifa_mtx);
 		free(ifa, M_IFADDR);
+	} else {
+		printf("ifa_free %p (now %u, won't free)\n", ifa,
+		    ifa->ifa_refcnt);
+		stack_print_short_ddb(&st);
 	}
 }