diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c
--- a/sys/arm64/arm64/pmap.c
+++ b/sys/arm64/arm64/pmap.c
@@ -1437,7 +1437,6 @@
 	 * Rebuild physmap one more time, we may have excluded more regions from
 	 * allocation since pmap_bootstrap().
 	 */
-	bzero(physmap, sizeof(physmap));
 	physmap_idx = physmem_avail(physmap, nitems(physmap));
 	physmap_idx /= 2;
 
diff --git a/sys/kern/subr_physmem.c b/sys/kern/subr_physmem.c
--- a/sys/kern/subr_physmem.c
+++ b/sys/kern/subr_physmem.c
@@ -189,6 +189,8 @@
 	const struct region *exp, *hwp;
 	uint64_t availsz;
 
+	bzero(avail, maxavail * sizeof(vm_paddr_t));
+
 	totalmem = 0;
 	availmem = 0;
 	availsz = 0;
@@ -587,7 +589,6 @@
 	rid = 0;
 
 	/* Get the avail list. */
-	bzero(avail_list, sizeof(avail_list));
 	regions_to_avail(avail_list, EXFLAG_NOALLOC | EXFLAG_NODUMP,
 	    PHYS_AVAIL_COUNT, 0, NULL, NULL);