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;