diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -147,7 +147,8 @@
 
 	TSENTER();
 	size = round_page(size);
-	if (vmem_alloc(kernel_arena, size, M_BESTFIT | M_NOWAIT, &addr))
+	if (vmem_xalloc(kernel_arena, size, 0, 0, 0, VMEM_ADDR_MIN,
+	    VMEM_ADDR_MAX, M_BESTFIT | M_NOWAIT, &addr))
 		return (0);
 	TSEXIT();
 
@@ -168,7 +169,7 @@
 {
 
 	size = round_page(size);
-	vmem_free(kernel_arena, addr, size);
+	vmem_xfree(kernel_arena, addr, size);
 }
 
 /*