diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -1500,6 +1500,7 @@
 	vap->va_birthtime.tv_sec = -1;
 	vap->va_birthtime.tv_nsec = 0;
 	vap->va_fsid = VNOVAL;
+	vap->va_gen = 0;
 	vap->va_rdev = NODEV;
 
 	error = VOP_GETATTR(vp, vap, a->a_active_cred);