Index: kstat.c
===================================================================
RCS file: /cvs/src/usr.bin/kstat/kstat.c,v
retrieving revision 1.11
diff -u -p -r1.11 kstat.c
--- kstat.c	10 Jul 2022 19:51:37 -0000	1.11
+++ kstat.c	11 Apr 2023 03:15:46 -0000
@@ -482,10 +482,9 @@ kstat_list(struct kstat_tree *kt, int fd
 		ksreq->ks_version = version;
 		ksreq->ks_id = ++id;
 
-		ksreq->ks_datalen = len = 64; /* magic */
-		ksreq->ks_data = malloc(len);
-		if (ksreq->ks_data == NULL)
-			err(1, "data alloc");
+		/* some kstat reads are slow, so avoid them for now */
+		ksreq->ks_datalen = 0;
+		ksreq->ks_data = NULL;
 
 		if (ioctl(fd, KSTATIOC_NFIND_ID, ksreq) == -1) {
 			if (errno == ENOENT) {
@@ -504,13 +503,7 @@ kstat_list(struct kstat_tree *kt, int fd
 			continue;
 		}
 
-		if (RBT_INSERT(kstat_tree, kt, kse) != NULL)
-			errx(1, "duplicate kstat entry");
-
-		if (kse->serrno != 0)
-			continue;
-
-		while (ksreq->ks_datalen > len) {
+		do {
 			len = ksreq->ks_datalen;
 			ksreq->ks_data = realloc(ksreq->ks_data, len);
 			if (ksreq->ks_data == NULL)
@@ -518,7 +511,10 @@ kstat_list(struct kstat_tree *kt, int fd
 
 			if (ioctl(fd, KSTATIOC_FIND_ID, ksreq) == -1)
 				err(1, "find id %llu", ksreq->ks_id);
-		}
+		} while (ksreq->ks_datalen > len);
+
+		if (RBT_INSERT(kstat_tree, kt, kse) != NULL)
+			errx(1, "duplicate kstat entry");
 	}
 }