Index: usr.bin/netstat/route.c
===================================================================
--- usr.bin/netstat/route.c
+++ usr.bin/netstat/route.c
@@ -252,7 +252,8 @@
 	char *buf, *next, *lim;
 	struct rt_msghdr *rtm;
 	struct sockaddr *sa;
-	int fam = AF_UNSPEC, ifindex = 0, size;
+	int count = 0, fam = AF_UNSPEC, ifindex = 0;
+	int size;
 	int need_table_close = false;
 
 	struct ifaddrs *ifap, *ifa;
@@ -303,10 +304,21 @@
 	if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
 		err(EX_OSERR, "sysctl: net.route.0.%d.dump.%d estimate", af,
 		    fibnum);
-	if ((buf = malloc(needed)) == NULL)
+retry:
+	if ((buf = malloc(roundup2(needed, PAGE_SIZE))) == NULL)
 		errx(2, "malloc(%lu)", (unsigned long)needed);
-	if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0)
-		err(1, "sysctl: net.route.0.%d.dump.%d", af, fibnum);
+	if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
+		if (count > 3)
+			err(1, "sysctl: net.route.0.%d.dump.%d", af, fibnum);
+		warnx("sysctl: net.route.0.%d.dump.%d: routing table grew "
+		      "beyond estimated buffer size (%zu), retrying with "
+		      "larger buffer...", af, fibnum, needed);
+		free(buf);
+		needed += needed;
+		usleep(100000 * count);
+		count++;
+		goto retry;
+	}
 	lim  = buf + needed;
 	xo_open_container("route-table");
 	xo_open_list("rt-family");