This script just makes sure that the ZFS module loads and unloads, mountall

script takes care of mounting filesystems.
Don't try to unmount all file systems before unloading the ZFS module, leave
that to the operator in preperation or the mountall script to take care
of. Module will of course fail to unload then if file systems are still
mounted.

etc/rc.d/zfs

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $NetBSD: zfs,v 1.4 2019/12/08 00:58:16 sevan Exp $
+# $NetBSD: zfs,v 1.5 2019/12/09 00:11:32 sevan Exp $
 #
 
 # PROVIDE: zfs
@@ -29,7 +29,6 @@ zfs_start()
 zfs_stop()
 {
 	if [ -x /sbin/zfs ]; then
-		zfs unmount -a
 		modunload zfs
 	fi
 	return 0;